Develop Reference

Protobuf-net object graph reference with surrogate

As far as I know, protobuf-net starting from v2 supports references but they cannot be used in conjunction with surrogate (exception "A reference-tracked object changed reference during deserialization" is thrown in this case)
I'm wondering if there is some workaround that I didn't consider to make it works.
Here following the code of my test case that reproduces the above exception.
Classes
public class Person
{
public Person(string name, GenderType gender)
{
Name = name;
Gender = gender;
}
public string Name { get; set; }
public GenderType Gender { get; set; }
}
[Flags]
public enum GenderType : byte
{
Male = 1,
Female = 2,
Both = Male | Female
}
public class Family
{
public Family(List<Person> people, Person familyHead = null)
{
People = people;
FamilyHead = familyHead;
}
public List<Person> People { get; set; }
public Person FamilyHead { get; set; }
}
public class PersonSurrogate
{
public string Name { get; set; }
public byte Gender { get; set; }
public PersonSurrogate(string name, byte gender)
{
Name = name;
Gender = gender;
}
#region Static Methods
public static implicit operator Person(PersonSurrogate surrogate)
{
if (surrogate == null) return null;
return new Person(surrogate.Name, (GenderType)surrogate.Gender);
}
public static implicit operator PersonSurrogate(Person source)
{
return source == null ? null : new PersonSurrogate(source.Name, (byte)source.Gender);
}
#endregion
}
public class FamilySurrogate
{
public FamilySurrogate(List<Person> people, Person familyHead)
{
People = people;
FamilyHead = familyHead;
}
public List<Person> People { get; set; }
public Person FamilyHead { get; set; }
#region Static Methods
public static implicit operator Family(FamilySurrogate surrogate)
{
if (surrogate == null) return null;
return new Family(surrogate.People, surrogate.FamilyHead);
}
public static implicit operator FamilySurrogate(Family source)
{
return source == null ? null : new FamilySurrogate(source.People, source.FamilyHead);
}
#endregion
}
Serializer
/// <summary>
/// Class with model for protobuf serialization
/// </summary>
public class FamilySerializer
{
public GenderType GenderToInclude;
public FamilySerializer(Family family, GenderType genderToInclude = GenderType.Both)
{
GenderToInclude = genderToInclude;
Family = family;
Init();
}
private void Init()
{
Model = RuntimeTypeModel.Create();
FillModel();
Model.CompileInPlace();
}
public FamilySerializer()
{
Init();
}
public Family Family { get; set; }
public RuntimeTypeModel Model { get; protected set; }
protected virtual void FillModel()
{
Model = RuntimeTypeModel.Create();
Model.Add(typeof(Family), false)
.SetSurrogate(typeof(FamilySurrogate));
MetaType mt = Model[typeof(FamilySurrogate)];
mt.Add(1, "People");
mt.AddField(2, "FamilyHead").AsReference = true; // Exception "A reference-tracked object changed reference during deserialization" - because using surrogate.
mt.UseConstructor = false;
Model.Add(typeof(Person), false)
.SetSurrogate(typeof(PersonSurrogate));
mt = Model[typeof(PersonSurrogate)]
.Add(1, "Name")
.Add(2, "Gender");
mt.UseConstructor = false; // Avoids to use the parameterless constructor.
}
public void Save(string fileName)
{
using (Stream s = File.Open(fileName, FileMode.Create, FileAccess.Write))
{
Model.Serialize(s, Family, new ProtoBuf.SerializationContext(){Context = this});
}
}
public void Open(string fileName)
{
using (Stream s = File.Open(fileName, FileMode.Open, FileAccess.Read))
{
Family = (Family)Model.Deserialize(s, null, typeof(Family), new ProtoBuf.SerializationContext(){Context = this});
}
}
}
Test Case
private Family FamilyTestCase(string fileName, bool save)
{
if (save)
{
var people = new List<Person>()
{
new Person("Angus", GenderType.Male),
new Person("John", GenderType.Male),
new Person("Katrina", GenderType.Female),
};
var fam = new Family(people, people[0]);
var famSer = new FamilySerializer(fam);
famSer.Save(fileName);
return fam;
}
else
{
var famSer = new FamilySerializer();
famSer.Open(fileName);
if (Object.ReferenceEquals(fam.People[0], fam.FamilyHead))
{
// I'd like this condition would be satisfied
}
return famSer.Family;
}
}

I think for now this is just an unsupported scenario and I'm unaware of a way to make it magically work; it may be something that I can get back to at some point, but there are many much higher priority things that would take precedence.
My usual advice here - and this applies to any serializer, not just protobuf-net: any time you find yourself hitting a limitation of the serializer, or even just something that is awkward to configure in the serializer: stop fighting the serializer. This kind of problem almost always arises when people try to serialize their regular domain model, and something in the domain model isn't a perfect fit for their chosen serializer. Instead of trying arcane magic: split your model - have your domain model be a good fit for what you want your application to see, and create a separate model that is a great fit for your serializer. Then you don't need concepts like "surrogates". If you're using multiple serialization formats, or have multiple different "versions" of layout in the same serialization format: have multiple serialization models.
It really isn't worth the headache of trying to make on model serve multiple masters.

Since I understand that will be not a supported scenario, I found a way to handle this and I'd like to share my complete solution, in case someone else needs this (or if someone else wanted to share a better solution or improve my approach)
Classes
public class Person
{
public Person(string name, GenderType gender)
{
Name = name;
Gender = gender;
}
public string Name { get; set; }
public GenderType Gender { get; set; }
}
[Flags]
public enum GenderType : byte
{
Male = 1,
Female = 2,
Both = Male | Female
}
public class Family
{
public Family(List<Person> people, Person familyHead = null)
{
People = people;
FamilyHead = familyHead;
}
public List<Person> People { get; set; }
public Person FamilyHead { get; set; }
}
#region Interfaces
/// <summary>
/// Interface for objects supporting the object graph reference.
/// </summary>
public interface ISurrogateWithReferenceId
{
/// <summary>
/// Gets or sets the id for the object referenced more than once during the process of serialization/deserialization.
/// </summary>
/// <remarks>Default value is -1.</remarks>
int ReferenceId { get; set; }
}
#endregion
public class PersonSurrogate : ISurrogateWithReferenceId
{
/// <summary>
/// Standard constructor.
/// </summary>
public PersonSurrogate(string name, byte gender)
{
Name = name;
Gender = gender;
ReferenceId = -1;
}
/// <summary>
/// Private constructor for object graph reference handling.
/// </summary>
private PersonSurrogate(int referenceId)
{
ReferenceId = referenceId;
}
public string Name { get; set; }
public byte Gender { get; set; }
#region object graph reference
/// <summary>
/// Gets the unique id assigned to the surrogate during the process of serialization/deserialization to handle object graph reference.
/// </summary>
/// <remarks>Default value is -1.</remarks>
public int ReferenceId { get; set; }
public override bool Equals(object obj)
{
return base.Equals(obj) || (ReferenceId > 0 && obj is ISurrogateWithReferenceId oi && oi.ReferenceId == ReferenceId);
}
public override int GetHashCode()
{
if (ReferenceId > 0)
return ReferenceId;
return base.GetHashCode();
}
#endregion object graph reference
protected virtual bool CheckSurrogateData(GenderType gender)
{
return gender == GenderType.Both || (GenderType)Gender == gender;
}
#region Static Methods
/// <summary>
/// Converts the surrogate to the related object during the deserialization process.
/// </summary>
public static implicit operator Person(PersonSurrogate surrogate)
{
if (surrogate == null) return null;
if (FamilySerializer.GetCachedObject(surrogate) is Person obj)
return obj;
obj = new Person(surrogate.Name, (GenderType)surrogate.Gender);
FamilySerializer.AddToCache(surrogate, obj);
return obj;
}
/// <summary>
/// Converts the object to the related surrogate during the serialization process.
/// </summary>
public static implicit operator PersonSurrogate(Person source)
{
if (source == null) return null;
if (FamilySerializer.GetCachedObjectWithReferenceId(source) is PersonSurrogate surrogate)
{
surrogate = new PersonSurrogate(surrogate.ReferenceId);
}
else
{
surrogate = new PersonSurrogate(source.Name, (byte)source.Gender);
FamilySerializer.AddToCache(source, surrogate);
}
return surrogate;
}
#endregion
}
public class FamilySurrogate
{
public FamilySurrogate(List<Person> people, Person familyHead)
{
People = people;
FamilyHead = familyHead;
}
public List<Person> People { get; set; }
public Person FamilyHead { get; set; }
#region Static Methods
public static implicit operator Family(FamilySurrogate surrogate)
{
if (surrogate == null) return null;
return new Family(surrogate.People, surrogate.FamilyHead);
}
public static implicit operator FamilySurrogate(Family source)
{
return source == null ? null : new FamilySurrogate(source.People, source.FamilyHead);
}
#endregion
}
Serializer
/// <summary>
/// Class with model for protobuf serialization
/// </summary>
public class FamilySerializer
{
public GenderType GenderToInclude;
public FamilySerializer(Family family, GenderType genderToInclude = GenderType.Both)
{
GenderToInclude = genderToInclude;
Family = family;
Init();
}
private void Init()
{
Model = RuntimeTypeModel.Create();
FillModel();
Model.CompileInPlace();
}
public FamilySerializer()
{
Init();
}
public Family Family { get; set; }
public RuntimeTypeModel Model { get; protected set; }
protected virtual void FillModel()
{
Model = RuntimeTypeModel.Create();
Model.Add(typeof(Family), false)
.SetSurrogate(typeof(FamilySurrogate));
MetaType mt = Model[typeof(FamilySurrogate)];
mt.Add(1, "People"); // This is a list of Person of course
//mt.AddField(2, "FamilyHead").AsReference = true; // Exception "A reference-tracked object changed reference during deserialization" - because using surrogate.
mt.Add(2, "FamilyHead");
mt.UseConstructor = false;
Model.Add(typeof(Person), false)
.SetSurrogate(typeof(PersonSurrogate));
mt = Model[typeof(PersonSurrogate)]
.Add(1, "Name")
.Add(2, "Gender")
.Add(3, "ReferenceId");
mt.UseConstructor = false; // Avoids to use the parameter-less constructor.
}
#region Cache
static FamilySerializer()
{
ResizeCache();
}
/// <summary>
/// Resizes the cache for object graph reference handling.
/// </summary>
/// <param name="size"></param>
public static void ResizeCache(int size = 500)
{
if (_cache != null)
{
foreach (var pair in _cache)
{
pair.Value.ResetCache();
}
}
_cache = new ConcurrentDictionary<int, FamilySerializerCache>();
for (var i = 0; i < size; i++)
_cache.TryAdd(i, new FamilySerializerCache());
}
private static ConcurrentDictionary<int, FamilySerializerCache> _cache;
/// <summary>
/// For internal use only. Adds the specified key and value to the serializer cache for the current thread during the serialization process.
/// </summary>
/// <param name="objKey">The the element to add as key.</param>
/// <param name="objValue">The value of the element to add.</param>
/// <remarks>The <see cref="ISurrogateWithReferenceId.ReferenceId"/> is updated for <see cref="objValue"/></remarks>
public static void AddToCache(object objKey, ISurrogateWithReferenceId objValue)
{
_cache[Thread.CurrentThread.ManagedThreadId].AddToCache(objKey, objValue);
}
/// <summary>
/// For internal use only. Adds the specified key and value to the serializer cache for the current thread during the serialization process.
/// </summary>
/// <param name="objKey">The the element to add as key.</param>
/// <param name="objValue">The value of the element to add.</param>
/// <remarks>The <see cref="ISurrogateWithReferenceId.ReferenceId"/> is updated for <see cref="objKey"/></remarks>
public static void AddToCache(ISurrogateWithReferenceId objKey, object objValue)
{
_cache[Thread.CurrentThread.ManagedThreadId].AddToCache(objKey, objValue);
}
/// <summary>
/// For internal use only. Resets the cache for the current thread.
/// </summary>
public static void ResetCache()
{
_cache[Thread.CurrentThread.ManagedThreadId].ResetCache();
}
/// <summary>
/// For internal use only. Gets the <see cref="ISurrogateWithReferenceId"/> associated with the specified object for the current thread.
/// </summary>
/// <param name="obj">The object corresponding to the value to get.</param>
/// <returns>The related ISurrogateWithReferenceId if presents, otherwise null.</returns>
public static ISurrogateWithReferenceId GetCachedObjectWithReferenceId(object obj)
{
return _cache[Thread.CurrentThread.ManagedThreadId].GetCachedObjectWithReferenceId(obj);
}
/// <summary>
/// For internal use only. Gets the object associated with the specified <see cref="ISurrogateWithReferenceId"/>.
/// </summary>
/// <param name="surrogateWithReferenceId">The <see cref="ISurrogateWithReferenceId"/> corresponding to the object to get.</param>
/// <returns>The related object if presents, otherwise null.</returns>
public static object GetCachedObject(ISurrogateWithReferenceId surrogateWithReferenceId)
{
return _cache[Thread.CurrentThread.ManagedThreadId].GetCachedObject(surrogateWithReferenceId);
}
#endregion Cache
public void Save(string fileName)
{
using (Stream s = File.Open(fileName, FileMode.Create, FileAccess.Write))
{
Model.Serialize(s, Family, new ProtoBuf.SerializationContext(){Context = this});
}
}
public void Open(string fileName)
{
using (Stream s = File.Open(fileName, FileMode.Open, FileAccess.Read))
{
Family = (Family)Model.Deserialize(s, null, typeof(Family), new ProtoBuf.SerializationContext(){Context = this});
}
}
}
Serializer cache
/// <summary>
/// Helper class to support object graph reference
/// </summary>
internal class FamilySerializerCache
{
// weak table for serialization
// ConditionalWeakTable uses ReferenceEquals() rather than GetHashCode() and Equals() methods to do equality checks, so I can use it as a cache during the writing process to overcome the issue with objects that have overridden the GetHashCode() and Equals() methods.
private ConditionalWeakTable<object, ISurrogateWithReferenceId> _writingTable = new ConditionalWeakTable<object, ISurrogateWithReferenceId>();
// dictionary for deserialization
private readonly Dictionary<ISurrogateWithReferenceId, object> _readingDictionary = new Dictionary<ISurrogateWithReferenceId, object>();
private int _referenceIdCounter = 1;
/// <summary>
/// Gets the value associated with the specified key during serialization process.
/// </summary>
/// <param name="key">The key of the value to get.</param>
/// <param name="value">When this method returns, contains the value associated with the specified key, if the key is found; otherwise, the default value for the type of the <paramref name="value" /> parameter. This parameter is passed uninitialized.</param>
/// <returns>True if the internal dictionary contains an element with the specified key, otherwise False.</returns>
private bool TryGetCachedObject(object key, out ISurrogateWithReferenceId value)
{
return _writingTable.TryGetValue(key, out value);
}
/// <summary>
/// Gets the value associated with the specified key during deserialization process.
/// </summary>
/// <param name="key">The key of the value to get.</param>
/// <param name="value">When this method returns, contains the value associated with the specified key, if the key is found; otherwise, the default value for the type of the <paramref name="value" /> parameter. This parameter is passed uninitialized.</param>
/// <returns>True if the internal dictionary contains an element with the specified key, otherwise False.</returns>
private bool TryGetCachedObject(ISurrogateWithReferenceId key, out object value)
{
return _readingDictionary.TryGetValue(key, out value);
}
/// <summary>
/// Resets the internal dictionaries and the counter;
/// </summary>
public void ResetCache()
{
_referenceIdCounter = 1;
_readingDictionary.Clear();
// ConditionalWeakTable automatically removes the key/value entry as soon as no other references to a key exist outside the table, but I want to clean it as well.
_writingTable = new ConditionalWeakTable<object, ISurrogateWithReferenceId>();
}
/// <summary>
/// Adds the specified key and value to the internal dictionary during serialization process.
/// </summary>
/// <param name="key">The key of the element to add.</param>
/// <param name="value">The value of the element to add.</param>
/// <remarks>If the object implements <see cref="ISurrogateWithReferenceId"/> interface then <see cref="ISurrogateWithReferenceId.ReferenceId"/> is updated.</remarks>
public void AddToCache(object key, ISurrogateWithReferenceId value)
{
if (value.ReferenceId == -1)
value.ReferenceId = _referenceIdCounter++;
_writingTable.Add(key, value);
}
/// <summary>
/// Adds the specified key and value to the internal dictionary during deserialization process.
/// </summary>
/// <param name="key">The key of the element to add.</param>
/// <param name="value">The value of the element to add.</param>
/// <remarks>If the object implements <see cref="ISurrogateWithReferenceId"/> interface then <see cref="ISurrogateWithReferenceId.ReferenceId"/> is updated.</remarks>
public void AddToCache(ISurrogateWithReferenceId key, object value)
{
if (key.ReferenceId == -1)
key.ReferenceId = _referenceIdCounter++;
_readingDictionary.Add(key, value);
}
/// <summary>
/// Gets the <see cref="ISurrogateWithReferenceId"/> associated with the specified object.
/// </summary>
/// <param name="obj">The object corresponding to the value to get.</param>
/// <returns>The related ISurrogateWithReferenceId if presents, otherwise null.</returns>
public ISurrogateWithReferenceId GetCachedObjectWithReferenceId(object obj)
{
if (TryGetCachedObject(obj, out ISurrogateWithReferenceId value))
return value;
return null;
}
/// <summary>
/// Gets the object associated with the specified <see cref="ISurrogateWithReferenceId"/>.
/// </summary>
/// <param name="surrogateWithReferenceId">The <see cref="ISurrogateWithReferenceId"/> corresponding to the object to get.</param>
/// <returns>The related object if presents, otherwise null.</returns>
public object GetCachedObject(ISurrogateWithReferenceId surrogateWithReferenceId)
{
if (TryGetCachedObject(surrogateWithReferenceId, out object value))
return value;
return null;
}
}
Test Case
private Family FamilyTestCase(string fileName, bool save)
{
if (save)
{
var people = new List<Person>()
{
new Person("Angus", GenderType.Male),
new Person("John", GenderType.Male),
new Person("Katrina", GenderType.Female),
};
var fam = new Family(people, people[0]);
var famSer = new FamilySerializer(fam);
famSer.Save(fileName);
return fam;
}
else
{
var famSer = new FamilySerializer();
famSer.Open(fileName);
if (Object.ReferenceEquals(fam.People[0], fam.FamilyHead))
{
Console.WriteLine("Family head is the same than People[0]!");
}
return famSer.Family;
}
}

ApiExplorer not showing methods from controller with ParameterBindingAttribute

I'm using ASP.NET Web API Help Page for my web API, but unfortunately controller method's that uses ParameterBindingAttribute are not being listed on GetApiExplorer(). Example bellow GetOutPut is listed and GetEntrance not.
public HelpController() : this(GlobalConfiguration.Configuration) { }
public HelpController(HttpConfiguration config)
{
Configuration = config;
}
public ActionResult Index()
{
ViewBag.DocumentationProvider = Configuration.Services.GetDocumentationProvider();
return View(Configuration.Services.GetApiExplorer().ApiDescriptions);
}
Controller's methods
/// <summary>
/// Entrance
/// </summary>
/// <param name="foo"></param>
/// <param name="initialDate"></param>
/// <param name="finalDate"></param>
/// <returns></returns>
[Route("entrance/{foo}/{initialDate}/{finalDate}")]
[HttpGet]
[ResponseType(typeof(BooModel))]
public IHttpActionResult GetEntrance(string foo,
[DateTimeParameter(DateFormat = DateTimeBindingFormats.yyyyMMddHHmm)] DateTime? initialDate,
[DateTimeParameter(DateFormat = DateTimeBindingFormats.yyyyMMddHHmm)] DateTime? finalDate)
{
try
{
return Ok();
}
catch (Exception ex)
{
return InternalServerError(ex);
}
}
/// <summary>
/// Out Put
/// </summary>
/// <param name="foo"></param>
/// <param name="initialDate"></param>
/// <param name="finalDate"></param>
/// <returns></returns>
[Route("output/{foo}/{initialDate}/{finalDate}")]
[HttpGet]
[ResponseType(typeof(FooModel))]
public IHttpActionResult GetOutPut(string foo, DateTime? initialDate, DateTime? finalDate)
{
try
{
return Ok();
}
catch (Exception ex)
{
return InternalServerError(ex);
}
}
XMLDocument.xml
<member name="M:IntegrationServices.Controllers.FooController.GetEntrance(System.String,System.Nullable{System.DateTime},System.Nullable{System.DateTime})">
<summary>
Entrance
</summary>
<param name="foo"></param>
<param name="initialDate"></param>
<param name="finalDate"></param>
<returns></returns>
</member>
<member name="M:IntegrationServices.Controllers.FooController.GetOutPut(System.String,System.Nullable{System.DateTime},System.Nullable{System.DateTime})">
<summary>
Out Put
</summary>
<param name="foo"></param>
<param name="initialDate"></param>
<param name="finalDate"></param>
<returns></returns>
</member>
ParameterBindingAttribute's class
public class DateTimeParameterAttribute : ParameterBindingAttribute
{
public string DateFormat { get; set; }
public bool ReadFromQueryString { get; set; }
public override HttpParameterBinding GetBinding(HttpParameterDescriptor parameter)
{
if (parameter.ParameterType != typeof(DateTime?)) return parameter.BindAsError("Expected type DateTime?");
var binding = new DateTimeParameterBinding(parameter)
{
DateFormat = DateFormat,
ReadFromQueryString = ReadFromQueryString
};
return binding;
}
}
Any ideas?

Entity Framework functions return nothing

This is my code :
http://i43.tinypic.com/acpgdd.jpg
entities = new SamaEntities();
var institute_ContractInstitute = entities.ContractInstitutes;
I get this error in watch page
institute_ContractInstitute The name 'institute_ContractInstitute'
does not exist in the current context
What does it mean?
This is ContractInstitute Class :
public partial class ContractInstitute : EntityObject
{
#region Factory Method
/// <summary>
/// Create a new ContractInstitute object.
/// </summary>
/// <param name="id">Initial value of the Id property.</param>
/// <param name="contractId">Initial value of the ContractId property.</param>
/// <param name="instituteId">Initial value of the InstituteId property.</param>
/// <param name="status">Initial value of the Status property.</param>
/// <param name="level">Initial value of the Level property.</param>
/// <param name="user_">Initial value of the User_ property.</param>
public static ContractInstitute CreateContractInstitute(global::System.Int32 id, global::System.Int32 contractId, global::System.Int32 instituteId, global::System.Int16 status, global::System.Int16 level, global::System.Int32 user_)
{
ContractInstitute contractInstitute = new ContractInstitute();
contractInstitute.Id = id;
contractInstitute.ContractId = contractId;
contractInstitute.InstituteId = instituteId;
contractInstitute.Status = status;
contractInstitute.Level = level;
contractInstitute.User_ = user_;
return contractInstitute;
}
#endregion
#region Primitive Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 Id
{
get
{
return _Id;
}
set
{
if (_Id != value)
{
OnIdChanging(value);
ReportPropertyChanging("Id");
_Id = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Id");
OnIdChanged();
}
}
}
private global::System.Int32 _Id;
partial void OnIdChanging(global::System.Int32 value);
partial void OnIdChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Double> Price
{
get
{
return _Price;
}
set
{
OnPriceChanging(value);
ReportPropertyChanging("Price");
_Price = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Price");
OnPriceChanged();
}
}
private Nullable<global::System.Double> _Price;
partial void OnPriceChanging(Nullable<global::System.Double> value);
partial void OnPriceChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 ContractId
{
get
{
return _ContractId;
}
set
{
OnContractIdChanging(value);
ReportPropertyChanging("ContractId");
_ContractId = StructuralObject.SetValidValue(value);
ReportPropertyChanged("ContractId");
OnContractIdChanged();
}
}
private global::System.Int32 _ContractId;
partial void OnContractIdChanging(global::System.Int32 value);
partial void OnContractIdChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 InstituteId
{
get
{
return _InstituteId;
}
set
{
OnInstituteIdChanging(value);
ReportPropertyChanging("InstituteId");
_InstituteId = StructuralObject.SetValidValue(value);
ReportPropertyChanged("InstituteId");
OnInstituteIdChanged();
}
}
private global::System.Int32 _InstituteId;
partial void OnInstituteIdChanging(global::System.Int32 value);
partial void OnInstituteIdChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int16 Status
{
get
{
return _Status;
}
set
{
OnStatusChanging(value);
ReportPropertyChanging("Status");
_Status = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Status");
OnStatusChanged();
}
}
private global::System.Int16 _Status;
partial void OnStatusChanging(global::System.Int16 value);
partial void OnStatusChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Double> CouncilPrice
{
get
{
return _CouncilPrice;
}
set
{
OnCouncilPriceChanging(value);
ReportPropertyChanging("CouncilPrice");
_CouncilPrice = StructuralObject.SetValidValue(value);
ReportPropertyChanged("CouncilPrice");
OnCouncilPriceChanged();
}
}
private Nullable<global::System.Double> _CouncilPrice;
partial void OnCouncilPriceChanging(Nullable<global::System.Double> value);
partial void OnCouncilPriceChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Int32> CurrencyId
{
get
{
return _CurrencyId;
}
set
{
OnCurrencyIdChanging(value);
ReportPropertyChanging("CurrencyId");
_CurrencyId = StructuralObject.SetValidValue(value);
ReportPropertyChanged("CurrencyId");
OnCurrencyIdChanged();
}
}
private Nullable<global::System.Int32> _CurrencyId;
partial void OnCurrencyIdChanging(Nullable<global::System.Int32> value);
partial void OnCurrencyIdChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int16 Level
{
get
{
return _Level;
}
set
{
OnLevelChanging(value);
ReportPropertyChanging("Level");
_Level = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Level");
OnLevelChanged();
}
}
private global::System.Int16 _Level;
partial void OnLevelChanging(global::System.Int16 value);
partial void OnLevelChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 User_
{
get
{
return _User_;
}
set
{
OnUser_Changing(value);
ReportPropertyChanging("User_");
_User_ = StructuralObject.SetValidValue(value);
ReportPropertyChanged("User_");
OnUser_Changed();
}
}
private global::System.Int32 _User_;
partial void OnUser_Changing(global::System.Int32 value);
partial void OnUser_Changed();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Int32> UserDelegate_
{
get
{
return _UserDelegate_;
}
set
{
OnUserDelegate_Changing(value);
ReportPropertyChanging("UserDelegate_");
_UserDelegate_ = StructuralObject.SetValidValue(value);
ReportPropertyChanged("UserDelegate_");
OnUserDelegate_Changed();
}
}
private Nullable<global::System.Int32> _UserDelegate_;
partial void OnUserDelegate_Changing(Nullable<global::System.Int32> value);
partial void OnUserDelegate_Changed();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Int32> UserLoginAz_
{
get
{
return _UserLoginAz_;
}
set
{
OnUserLoginAz_Changing(value);
ReportPropertyChanging("UserLoginAz_");
_UserLoginAz_ = StructuralObject.SetValidValue(value);
ReportPropertyChanged("UserLoginAz_");
OnUserLoginAz_Changed();
}
}
private Nullable<global::System.Int32> _UserLoginAz_;
partial void OnUserLoginAz_Changing(Nullable<global::System.Int32> value);
partial void OnUserLoginAz_Changed();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Double> HoldingPrice
{
get
{
return _HoldingPrice;
}
set
{
OnHoldingPriceChanging(value);
ReportPropertyChanging("HoldingPrice");
_HoldingPrice = StructuralObject.SetValidValue(value);
ReportPropertyChanged("HoldingPrice");
OnHoldingPriceChanged();
}
}
private Nullable<global::System.Double> _HoldingPrice;
partial void OnHoldingPriceChanging(Nullable<global::System.Double> value);
partial void OnHoldingPriceChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Double> CouncilHoldingPrice
{
get
{
return _CouncilHoldingPrice;
}
set
{
OnCouncilHoldingPriceChanging(value);
ReportPropertyChanging("CouncilHoldingPrice");
_CouncilHoldingPrice = StructuralObject.SetValidValue(value);
ReportPropertyChanged("CouncilHoldingPrice");
OnCouncilHoldingPriceChanged();
}
}
private Nullable<global::System.Double> _CouncilHoldingPrice;
partial void OnCouncilHoldingPriceChanging(Nullable<global::System.Double> value);
partial void OnCouncilHoldingPriceChanged();
#endregion
#region Navigation Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("SamaModel", "ConInsGroup", "Group")]
public EntityCollection<Group> Groups
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection<Group>("SamaModel.ConInsGroup", "Group");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedCollection<Group>("SamaModel.ConInsGroup", "Group", value);
}
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("SamaModel", "ContractContractInstitute", "Contract")]
public Contract Contract
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Contract>("SamaModel.ContractContractInstitute", "Contract").Value;
}
set
{
((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Contract>("SamaModel.ContractContractInstitute", "Contract").Value = value;
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[BrowsableAttribute(false)]
[DataMemberAttribute()]
public EntityReference<Contract> ContractReference
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Contract>("SamaModel.ContractContractInstitute", "Contract");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedReference<Contract>("SamaModel.ContractContractInstitute", "Contract", value);
}
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("SamaModel", "InstituteContractInstitute", "Institute")]
public Institute Institute
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Institute>("SamaModel.InstituteContractInstitute", "Institute").Value;
}
set
{
((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Institute>("SamaModel.InstituteContractInstitute", "Institute").Value = value;
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[BrowsableAttribute(false)]
[DataMemberAttribute()]
public EntityReference<Institute> InstituteReference
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Institute>("SamaModel.InstituteContractInstitute", "Institute");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedReference<Institute>("SamaModel.InstituteContractInstitute", "Institute", value);
}
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("SamaModel", "CurrencyContractInstitute", "Currency")]
public Currency Currency
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Currency>("SamaModel.CurrencyContractInstitute", "Currency").Value;
}
set
{
((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Currency>("SamaModel.CurrencyContractInstitute", "Currency").Value = value;
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[BrowsableAttribute(false)]
[DataMemberAttribute()]
public EntityReference<Currency> CurrencyReference
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference<Currency>("SamaModel.CurrencyContractInstitute", "Currency");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedReference<Currency>("SamaModel.CurrencyContractInstitute", "Currency", value);
}
}
}
#endregion
}

I get this error in watch page
The name 'institute_ContractInstitute' does not exist in the current context
That means exactly what it says: no variable with the name institute_ContractInstitute exists in the current context, i.e. where your program currently is.
Put a breakpoint after var institute_ContractInstitute = ... and then you can inspect its contents in the Watch window.

Probably the issue is due to lazy loading. whatever data is in entities.ContractInstitutes is not getting loaded. Try to use a List<> type variable and put the ContractInstitutes into the list using .ToList().

How to read Xml to Linq from service

I have a string data get from service Location Xml
I want to read response text and return ObservableCollection
public void SearchLocation(string address)
{
var webclient = new WebClient();
if (address != "")
{
string url =
string.Format(
#"http://dev.virtualearth.net/REST/v1/Locations?countryRegion=Vietnam&adminDistrict=Ha Noi&locality={0}&o=xml&key={1}",
address, BingMapKey);
webclient.DownloadStringAsync(new Uri(url));
webclient.DownloadStringCompleted += WebclientOnDownloadStringCompleted;
}
}
private void WebclientOnDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
string data = e.Result;
ReadXml(data);
}
private void ReadXml(string data)
{
_locations.Clear();
XDocument document = XDocument.Parse(data);
var locations = from loca in document.Descendants("Location")
select
new Location(loca.Element("Name").Value,
loca.Element("Point").Element("Latitude").Value,"1",
"1", "1", "1", "1");
_locations = (ObservableCollection<Location>) locations;
}
}
Class Location:
public class Location
{
/// <summary>
/// Tên địa điểm
/// </summary>
public string Name { get; set; }
/// <summary>
/// Vĩ độ
/// </summary>
public double Latitude { get; set; }
/// <summary>
/// Kinh độ
/// </summary>
public double Longitute { get; set; }
/// <summary>
/// Vĩ độ Nam
/// </summary>
public double SouthLatitude { get; set; }
/// <summary>
/// Kinh độ Tây
/// </summary>
public double WestLongtitue { get; set; }
/// <summary>
/// Vĩ độ Bắc
/// </summary>
public double NorthLatitude { get; set; }
/// <summary>
/// Kinh độ Tây
/// </summary>
public double EastLongitude { get; set; }
/// <summary>
/// Khởi tạo Location
/// </summary>
/// <param name="name">tên địa điểm</param>
/// <param name="latitue">vĩ độ</param>
/// <param name="longitude">kinh độ</param>
/// <param name="southLatitude">vĩ độ nam</param>
/// <param name="westLongitude">kinh độ tây</param>
/// <param name="northLatitude">vĩ độ bắc</param>
/// <param name="eastLongitude">kinh độ đông</param>
public Location(string name, string latitue, string longitude, string southLatitude, string westLongitude,
string northLatitude, string eastLongitude)
{
Name = name;
Latitude = Convert.ToDouble(latitue);
Longitute = Convert.ToDouble(longitude);
SouthLatitude = Convert.ToDouble(southLatitude);
NorthLatitude = Convert.ToDouble(northLatitude);
WestLongtitue = Convert.ToDouble(westLongitude);
EastLongitude = Convert.ToDouble(eastLongitude);
}
}
I read and _location return null, where are errors?

You can cast IEnumerable<Location> which is a result of LINQ to XML query to ObservableCollection<Location> directly.
_locations = (ObservableCollection<Location>) locations;
Just add all elements from query result collection into existing ObservableCollection:
foreach(var location in locations)
_locations.Add(location);
Update
There is also namespace problem in your code. Try that one:
XDocument document = XDocument.Parse(data);
var ns = XNamespace.Get("http://schemas.microsoft.com/search/local/ws/rest/v1");
var locations = from loca in document.Descendants(ns + "Location")
select
new Location(loca.Element(ns + "Name").Value,
loca.Element(ns + "Point").Element(ns + "Latitude").Value, "1",
"1", "1", "1", "1");

Upload JSON via WebClient

I have a web app with that is using JQuery to interact with my backend. The backend successfully accepts JSON data. For instance, I can successfully send the following JSON:
{ "id":1, "firstName":"John", "lastName":"Smith" }
I now have a Windows Phone app that must hit this backend. I need to pass this same JSON via a WebClient. Currently I have the following, but i'm not sure how to actually pass the JSON.
string address = "http://www.mydomain.com/myEndpoint;
WebClient myService = new WebClient();
utilityService.UploadStringCompleted += new UploadStringCompletedEventHandler(utilityService_UploadStringCompleted);
utilityService.UploadStringAsync(address, string.Empty);
Can someone tell me what I need to do?

Although the question is already answered, I thought it would be nice to share my simple JsonService, based on the WebClient:
Base class
/// <summary>
/// Class BaseJsonService.
/// </summary>
public abstract class BaseJsonService
{
/// <summary>
/// The client
/// </summary>
protected WebClient client;
/// <summary>
/// Gets the specified URL.
/// </summary>
/// <typeparam name="TResponse">The type of the attribute response.</typeparam>
/// <param name="url">The URL.</param>
/// <param name="onComplete">The configuration complete.</param>
/// <param name="onError">The configuration error.</param>
public abstract void Get<TResponse>(string url, Action<TResponse> onComplete, Action<Exception> onError);
/// <summary>
/// Sends the specified URL.
/// </summary>
/// <typeparam name="TResponse">The type of the attribute response.</typeparam>
/// <param name="url">The URL.</param>
/// <param name="jsonData">The json data.</param>
/// <param name="onComplete">The configuration complete.</param>
/// <param name="onError">The configuration error.</param>
public abstract void Post<TResponse>(string url, string jsonData, Action<TResponse> onComplete, Action<Exception> onError);
}
Service implementation
/// <summary>
/// Class JsonService.
/// </summary>
public class JsonService : BaseJsonService
{
/// <summary>
/// Gets the specified URL.
/// </summary>
/// <typeparam name="TResponse">The type of the attribute response.</typeparam>
/// <param name="url">The URL.</param>
/// <param name="onComplete">The configuration complete.</param>
/// <param name="onError">The configuration error.</param>
public override void Get<TResponse>(string url, Action<TResponse> onComplete, Action<Exception> onError)
{
if (client == null)
client = new WebClient();
client.DownloadStringCompleted += (s, e) =>
{
TResponse returnValue = default(TResponse);
try
{
returnValue = JsonConvert.DeserializeObject<TResponse>(e.Result);
onComplete(returnValue);
}
catch (Exception ex)
{
onError(new JsonParseException(ex));
}
};
client.Headers.Add(HttpRequestHeader.Accept, "application/json");
client.Encoding = System.Text.Encoding.UTF8;
client.DownloadStringAsync(new Uri(url));
}
/// <summary>
/// Posts the specified URL.
/// </summary>
/// <typeparam name="TResponse">The type of the attribute response.</typeparam>
/// <param name="url">The URL.</param>
/// <param name="jsonData">The json data.</param>
/// <param name="onComplete">The configuration complete.</param>
/// <param name="onError">The configuration error.</param>
public override void Post<TResponse>(string url, string jsonData, Action<TResponse> onComplete, Action<Exception> onError)
{
if (client == null)
client = new WebClient();
client.UploadDataCompleted += (s, e) =>
{
if (e.Error == null && e.Result != null)
{
TResponse returnValue = default(TResponse);
try
{
string response = Encoding.UTF8.GetString(e.Result);
returnValue = JsonConvert.DeserializeObject<TResponse>(response);
}
catch (Exception ex)
{
onError(new JsonParseException(ex));
}
onComplete(returnValue);
}
else
onError(e.Error);
};
client.Headers.Add(HttpRequestHeader.ContentType, "application/json");
client.Encoding = System.Text.Encoding.UTF8;
byte[] data = Encoding.UTF8.GetBytes(jsonData);
client.UploadDataAsync(new Uri(url), "POST", data);
}
}
Example usage
/// <summary>
/// Determines whether this instance [can get result from service].
/// </summary>
[Test]
public void CanGetResultFromService()
{
string url = "http://httpbin.org/ip";
Ip result;
service.Get<Ip>(url,
success =>
{
result = success;
},
error =>
{
Debug.WriteLine(error.Message);
});
Thread.Sleep(5000);
}
/// <summary>
/// Determines whether this instance [can post result automatic service].
/// </summary>
[Test]
public void CanPostResultToService()
{
string url = "http://httpbin.org/post";
string data = "{\"test\":\"hoi\"}";
HttpBinResponse result = null;
service.Post<HttpBinResponse>(url, data,
response =>
{
result = response;
},
error =>
{
Debug.WriteLine(error.Message);
});
Thread.Sleep(5000);
}
}
public class Ip
{
public string Origin { get; set; }
}
public class HttpBinResponse
{
public string Url { get; set; }
public string Origin { get; set; }
public Headers Headers { get; set; }
public object Json { get; set; }
public string Data { get; set; }
}
public class Headers
{
public string Connection { get; set; }
[JsonProperty("Content-Type")]
public string ContentType { get; set; }
public string Host { get; set; }
[JsonProperty("Content-Length")]
public string ContentLength { get; set; }
}
Just to share some knowledge!
Good luck!

Figured it out. I was forgetting the following:
myService.Headers.Add("Content-Type", "application/json");