Related
The following javascript question is the same problem i'm attempting to solve but in c#
How can I merge 2 dot notation strings to a GraphQL query string
Expected structure is
{
"Case": {
"Owner": {
"Name": null,
"ProfilePic": null
},
"CaseNo": null,
"FieldOfLaw":{
"Name": null
},
"CaseType": {
"Name": null
},
"CaseSubType": {
"Name": null
},
},
"Client":{
"Policy":{
"PolicyNo": null
}
}
}
and my current output is
{
"Case": {
"Owner": {
"Name": null,
"ProfilePic": null
},
"CaseNo": null,
"FieldOfLaw": null,
"CaseType": null,
"CaseSubType": null
}
}
Below is my attempt using ExpandoObjects to try dynamically generate the objects needed. Any advice or pointers in the right direction would be appreciated.
public static void Main(string[] args)
{
var FieldList = new List<string>
{
"Case.Owner.Name",
"Case.Owner.ProfilePic",
"Case.CaseNo",
"Case.FieldOfLaw.Name",
"Case.CaseType.Name",
"Case.CaseSubType.Name",
"Client.Policy.PolicyNo",
};
Parser graphQL = new Parser();
var result = graphQL.Parse(FieldList);
Console.Write(result);
}
Below is the actual parse method, so i'm running an aggregation function over each element to create and return the expando objects into the initial holder. I traverse each split string recursively and exit the recursion once there are no more items left in the split list.
public class Parser
{
public string Parse(List<string> fieldList)
{
// List<ExpandoObject> queryHolder = new List<ExpandoObject>();
ExpandoObject intialSeed = new ExpandoObject();
fieldList.Aggregate(intialSeed, (holder, field) =>
{
holder = ParseToObject(holder, field.Split('.').ToList());
return holder;
});
return JsonConvert.SerializeObject(intialSeed);
}
public ExpandoObject ParseToObject(ExpandoObject holder, List<string> fieldSplit, string previousKey = null)
{
if (fieldSplit.Any())
{
var item = fieldSplit.Shift();
if (item == null)
return holder;
// If the current item doesn't exists in the dictionary
if (!((IDictionary<string, object>)holder).ContainsKey(item))
{
if (((IDictionary<string, object>)holder).Keys.Count() == 0)
holder.TryAdd(item, null);
else
_ = ((IDictionary<string, object>)holder).GetItemByKeyRecursively(previousKey, item);
}
previousKey = item;
ParseToObject(holder, fieldSplit, previousKey);
}
return holder;
}
}
Here are my two extensions methods, i'm having an issue with the GetItemByKeyRecursively when it goes into the 3rd level in it's recursion so example.
I'm adding FieldOfLaw it adds the property to the Case expandoObject but doesn't know how to get back to the leaf containing Owner, CaseNo etc.
public static class CollectionExtensions
{
public static T Shift<T>(this IList<T> list)
{
var shiftedElement = list.FirstOrDefault();
list.RemoveAt(0);
return shiftedElement;
}
public static IDictionary<string, object> GetItemByKeyRecursively(this IDictionary<string, object> dictionary, string parentKey, string keyToCreate)
{
foreach (string key in dictionary.Keys)
{
var leaf = dictionary[key];
if (key == parentKey)
{
var #value = dictionary[key];
if (#value is ExpandoObject)
{
(#value as ExpandoObject).TryAdd(keyToCreate, null);
}
else if (#value == null)
{
var item = new ExpandoObject();
item.TryAdd(keyToCreate, null);
dictionary[key] = item;
}
return dictionary;
}
if (leaf == null)
continue;
return GetItemByKeyRecursively((IDictionary<string, object>)leaf, parentKey, keyToCreate);
}
return null;
}
}
Nothing you can't accomplish mostly declaratively.
public string Parse(List<string> fieldList)
{
var fieldPaths = fieldList.Select(x => x.Split('.').ToList());
var groups = fieldPaths.GroupBy(x => x.First(), x => x.Skip(1));
return ParseGroups(groups, 1);
}
private string ParseGroups(IEnumerable<IGrouping<string, IEnumerable<string>>> groups, int level)
{
string indent = new string('\t', level - 1);
var groupResults = groups.Select(g =>
!g.First().Any() ?
$"\t{indent}{g.Key}: null" :
$"\t{indent}{g.Key}: " + string.Join(", \n",
ParseGroups(g.GroupBy(x => x.First(), x => x.Skip(1)), level + 1))
);
return indent + "{\n" + string.Join(", \n", groupResults) + "\n" + indent + "}";
}
See the complete sample code here: https://dotnetfiddle.net/RLygjt
How do I achieve the same result as code below using LINQ?
What it do is if a string is different from any of the string in a list of strings, it will return true.
public static bool MasterPlantDifferentFromDetailPlant(string mrNumber)
{
string masterPlant = t_MT_MTInfo.GetMaterialRequestPlant(mrNumber);
List<string> detailPlants = t_MT_MTItem.GetPlants(mrNumber);
bool differentPlant = false;
foreach (string plant in detailPlants)
{
if (string.Compare(masterPlant.Trim(), plant.Trim(), StringComparison.OrdinalIgnoreCase) != 0)
{
differentPlant = true;
break;
}
}
return differentPlant;
}
detailPlants.Any(p => string.Compare(masterPlant.Trim(), p.Trim(), StringComparison.OrdinalIgnoreCase) != 0)
Try like this;
public static bool MasterPlantDifferentFromDetailPlant(string mrNumber)
{
string masterPlant = t_MT_MTInfo.GetMaterialRequestPlant(mrNumber);
List<string> detailPlants = t_MT_MTItem.GetPlants(mrNumber);
return !detailPlants.All(x => string.Equals(masterPlant.Trim(), x.Trim(), StringComparison.OrdinalIgnoreCase));
}
How do I serialize an object into query-string format? I can't seem to find an answer on google. Thanks.
Here is the object I will serialize as an example.
public class EditListItemActionModel
{
public int? Id { get; set; }
public int State { get; set; }
public string Prefix { get; set; }
public string Index { get; set; }
public int? ParentID { get; set; }
}
I'm 99% sure there's no built-in utility method for this. It's not a very common task, since a web server doesn't typically respond with a URLEncoded key/value string.
How do you feel about mixing reflection and LINQ? This works:
var foo = new EditListItemActionModel() {
Id = 1,
State = 26,
Prefix = "f",
Index = "oo",
ParentID = null
};
var properties = from p in foo.GetType().GetProperties()
where p.GetValue(foo, null) != null
select p.Name + "=" + HttpUtility.UrlEncode(p.GetValue(foo, null).ToString());
// queryString will be set to "Id=1&State=26&Prefix=f&Index=oo"
string queryString = String.Join("&", properties.ToArray());
Update:
To write a method that returns the QueryString representation of any 1-deep object, you could do this:
public string GetQueryString(object obj) {
var properties = from p in obj.GetType().GetProperties()
where p.GetValue(obj, null) != null
select p.Name + "=" + HttpUtility.UrlEncode(p.GetValue(obj, null).ToString());
return String.Join("&", properties.ToArray());
}
// Usage:
string queryString = GetQueryString(foo);
You could also make it an extension method without much additional work
public static class ExtensionMethods {
public static string GetQueryString(this object obj) {
var properties = from p in obj.GetType().GetProperties()
where p.GetValue(obj, null) != null
select p.Name + "=" + HttpUtility.UrlEncode(p.GetValue(obj, null).ToString());
return String.Join("&", properties.ToArray());
}
}
// Usage:
string queryString = foo.GetQueryString();
Using Json.Net it would be much easier, by serializing and then deserializing to key value pairs.
Here is a code example:
using Newtonsoft.Json;
using System.Web;
string ObjToQueryString(object obj)
{
var step1 = JsonConvert.SerializeObject(obj);
var step2 = JsonConvert.DeserializeObject<IDictionary<string, string>>(step1);
var step3 = step2.Select(x => HttpUtility.UrlEncode(x.Key) + "=" + HttpUtility.UrlEncode(x.Value));
return string.Join("&", step3);
}
Building on the good ideas from other comments, I have made a generic extension method .ToQueryString(), which can be used on any object.
public static class UrlHelpers
{
public static string ToQueryString(this object request, string separator = ",")
{
if (request == null)
throw new ArgumentNullException("request");
// Get all properties on the object
var properties = request.GetType().GetProperties()
.Where(x => x.CanRead)
.Where(x => x.GetValue(request, null) != null)
.ToDictionary(x => x.Name, x => x.GetValue(request, null));
// Get names for all IEnumerable properties (excl. string)
var propertyNames = properties
.Where(x => !(x.Value is string) && x.Value is IEnumerable)
.Select(x => x.Key)
.ToList();
// Concat all IEnumerable properties into a comma separated string
foreach (var key in propertyNames)
{
var valueType = properties[key].GetType();
var valueElemType = valueType.IsGenericType
? valueType.GetGenericArguments()[0]
: valueType.GetElementType();
if (valueElemType.IsPrimitive || valueElemType == typeof (string))
{
var enumerable = properties[key] as IEnumerable;
properties[key] = string.Join(separator, enumerable.Cast<object>());
}
}
// Concat all key/value pairs into a string separated by ampersand
return string.Join("&", properties
.Select(x => string.Concat(
Uri.EscapeDataString(x.Key), "=",
Uri.EscapeDataString(x.Value.ToString()))));
}
}
It will also work for objects that have properties of the type Array and generic Lists if they only contain primitives or strings.
Try it out, comments are welcome: Serialize object into a query string with Reflection
Based on the the popular answers, I needed to update the code to support arrays as well. Sharing the implementation:
public string GetQueryString(object obj)
{
var result = new List<string>();
var props = obj.GetType().GetProperties().Where(p => p.GetValue(obj, null) != null);
foreach (var p in props)
{
var value = p.GetValue(obj, null);
var enumerable = value as ICollection;
if (enumerable != null)
{
result.AddRange(from object v in enumerable select string.Format("{0}={1}", p.Name, HttpUtility.UrlEncode(v.ToString())));
}
else
{
result.Add(string.Format("{0}={1}", p.Name, HttpUtility.UrlEncode(value.ToString())));
}
}
return string.Join("&", result.ToArray());
}
It will also be useful for nested objects
public static class HttpQueryStrings
{
private static readonly StringBuilder _query = new();
public static string ToQueryString<T>(this T #this) where T : class
{
_query.Clear();
BuildQueryString(#this, "");
if (_query.Length > 0) _query[0] = '?';
return _query.ToString();
}
private static void BuildQueryString<T>(T? obj, string prefix = "") where T : class
{
if (obj == null) return;
foreach (var p in obj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if (p.GetValue(obj, Array.Empty<object>()) != null)
{
var value = p.GetValue(obj, Array.Empty<object>());
if (p.PropertyType.IsArray && value?.GetType() == typeof(DateTime[]))
foreach (var item in (DateTime[])value)
_query.Append($"&{prefix}{p.Name}={item.ToString("yyyy-MM-dd")}");
else if (p.PropertyType.IsArray)
foreach (var item in (Array)value!)
_query.Append($"&{prefix}{p.Name}={item}");
else if (p.PropertyType == typeof(string))
_query.Append($"&{prefix}{p.Name}={value}");
else if (p.PropertyType == typeof(DateTime) && !value!.Equals(Activator.CreateInstance(p.PropertyType))) // is not default
_query.Append($"&{prefix}{p.Name}={((DateTime)value).ToString("yyyy-MM-dd")}");
else if (p.PropertyType.IsValueType && !value!.Equals(Activator.CreateInstance(p.PropertyType))) // is not default
_query.Append($"&{prefix}{p.Name}={value}");
else if (p.PropertyType.IsClass)
BuildQueryString(value, $"{prefix}{p.Name}.");
}
}
}
}
An example of using the solution:
string queryString = new
{
date = new DateTime(2020, 1, 1),
myClass = new MyClass
{
FirstName = "john",
LastName = "doe"
},
myArray = new int[] { 1, 2, 3, 4 },
}.ToQueryString();
Perhaps this Generic approach will be useful:
public static string ConvertToQueryString<T>(T entity) where T: class
{
var props = typeof(T).GetProperties();
return $"?{string.Join('&', props.Where(r=> r.GetValue(entity) != null).Select(r => $"{HttpUtility.UrlEncode(r.Name)}={HttpUtility.UrlEncode(r.GetValue(entity).ToString())}"))}";
}
public static class UrlHelper
{
public static string ToUrl(this Object instance)
{
var urlBuilder = new StringBuilder();
var properties = instance.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
for (int i = 0; i < properties.Length; i++)
{
urlBuilder.AppendFormat("{0}={1}&", properties[i].Name, properties[i].GetValue(instance, null));
}
if (urlBuilder.Length > 1)
{
urlBuilder.Remove(urlBuilder.Length - 1, 1);
}
return urlBuilder.ToString();
}
}
This my solution:
public static class ObjectExtensions
{
public static string ToQueryString(this object obj)
{
if (!obj.GetType().IsComplex())
{
return obj.ToString();
}
var values = obj
.GetType()
.GetProperties()
.Where(o => o.GetValue(obj, null) != null);
var result = new QueryString();
foreach (var value in values)
{
if (!typeof(string).IsAssignableFrom(value.PropertyType)
&& typeof(IEnumerable).IsAssignableFrom(value.PropertyType))
{
var items = value.GetValue(obj) as IList;
if (items.Count > 0)
{
for (int i = 0; i < items.Count; i++)
{
result = result.Add(value.Name, ToQueryString(items[i]));
}
}
}
else if (value.PropertyType.IsComplex())
{
result = result.Add(value.Name, ToQueryString(value));
}
else
{
result = result.Add(value.Name, value.GetValue(obj).ToString());
}
}
return result.Value;
}
private static bool IsComplex(this Type type)
{
var typeInfo = type.GetTypeInfo();
if (typeInfo.IsGenericType && typeInfo.GetGenericTypeDefinition() == typeof(Nullable<>))
{
// nullable type, check if the nested type is simple.
return IsComplex(typeInfo.GetGenericArguments()[0]);
}
return !(typeInfo.IsPrimitive
|| typeInfo.IsEnum
|| type.Equals(typeof(Guid))
|| type.Equals(typeof(string))
|| type.Equals(typeof(decimal)));
}
}
I use this extension for my integration test, it works perfectly :)
Just another variation of the above, but I wanted to utilize the existing DataMember attributes in my model class, so only the properties I want to serialize are sent to the server in the url in the GET request.
public string ToQueryString(object obj)
{
if (obj == null) return "";
return "?" + string.Join("&", obj.GetType()
.GetProperties()
.Where(p => Attribute.IsDefined(p, typeof(DataMemberAttribute)) && p.GetValue(obj, null) != null)
.Select(p => $"{p.Name}={Uri.EscapeDataString(p.GetValue(obj).ToString())}"));
}
Here is something I wrote that does what you need.
public string CreateAsQueryString(PageVariables pv) //Pass in your EditListItemActionModel instead
{
int i = 0;
StringBuilder sb = new StringBuilder();
foreach (var prop in typeof(PageVariables).GetProperties())
{
if (i != 0)
{
sb.Append("&");
}
var x = prop.GetValue(pv, null).ToString();
if (x != null)
{
sb.Append(prop.Name);
sb.Append("=");
sb.Append(x.ToString());
}
i++;
}
Formating encoding = new Formating();
// I am encoding my query string - but you don''t have to
return "?" + HttpUtility.UrlEncode(encoding.RC2Encrypt(sb.ToString()));
}
I was looking for a solution to this for a Windows 10 (UWP) App. Taking the Relection approach suggested by Dave, and after adding the Microsoft.AspNet.WebApi.Client Nuget package, I used the following code,
which handles Url Encoding of the property values:
private void AddContentAsQueryString(ref Uri uri, object content)
{
if ((uri != null) && (content != null))
{
UriBuilder builder = new UriBuilder(uri);
HttpValueCollection query = uri.ParseQueryString();
IEnumerable<PropertyInfo> propInfos = content.GetType().GetRuntimeProperties();
foreach (var propInfo in propInfos)
{
object value = propInfo.GetValue(content, null);
query.Add(propInfo.Name, String.Format("{0}", value));
}
builder.Query = query.ToString();
uri = builder.Uri;
}
}
A simple approach that supports list properties:
public static class UriBuilderExtensions
{
public static UriBuilder SetQuery<T>(this UriBuilder builder, T parameters)
{
var fragments = typeof(T).GetProperties()
.Where(property => property.CanRead)
.Select(property => new
{
property.Name,
Value = property.GetMethod.Invoke(parameters, null)
})
.Select(pair => new
{
pair.Name,
List = (!(pair.Value is string) && pair.Value is IEnumerable list ? list.Cast<object>() : new[] { pair.Value })
.Select(element => element?.ToString())
.Where(element => !string.IsNullOrEmpty(element))
})
.Where(pair => pair.List.Any())
.SelectMany(pair => pair.List.Select(value => Uri.EscapeDataString(pair.Name) + '=' + Uri.EscapeDataString(value)));
builder.Query = string.Join("&", fragments);
return builder;
}
}
A faster solution which is as fast as spelling out the code to serialize each type:
public static class UriBuilderExtensions
{
public static UriBuilder SetQuery<TSource>(this UriBuilder builder, TSource parameters)
{
var fragments = Cache<TSource>.Properties
.Select(property => new
{
property.Name,
List = property.FetchValue(parameters)?.Where(item => !string.IsNullOrEmpty(item))
})
.Where(parameter => parameter.List?.Any() ?? false)
.SelectMany(pair => pair.List.Select(item => Uri.EscapeDataString(pair.Name) + '=' + Uri.EscapeDataString(item)));
builder.Query = string.Join("&", fragments);
return builder;
}
/// <summary>
/// Caches dynamically emitted code which converts a types getter property values to a list of strings.
/// </summary>
/// <typeparam name="TSource">The type of the object being serialized</typeparam>
private static class Cache<TSource>
{
public static readonly IEnumerable<IProperty> Properties =
typeof(TSource).GetProperties()
.Where(propertyInfo => propertyInfo.CanRead)
.Select(propertyInfo =>
{
var source = Expression.Parameter(typeof(TSource));
var getter = Expression.Property(source, propertyInfo);
var cast = Expression.Convert(getter, typeof(object));
var expression = Expression.Lambda<Func<TSource, object>>(cast, source).Compile();
return new Property
{
Name = propertyInfo.Name,
FetchValue = typeof(IEnumerable).IsAssignableFrom(propertyInfo.PropertyType) && propertyInfo.PropertyType != typeof(string) ?
CreateListFetcher(expression) :
CreateValueFetcher(expression)
};
})
.OrderBy(propery => propery.Name)
.ToArray();
/// <summary>
/// Creates a function which serializes a <see cref="IEnumerable"/> property value to a list of strings.
/// </summary>
/// <param name="get">A lambda function which retrieves the property value from a given source object.</param>
private static Func<TSource, IEnumerable<string>> CreateListFetcher(Func<TSource, object> get)
=> obj => ((IEnumerable)get(obj))?.Cast<object>().Select(item => item?.ToString());
/// <summary>
/// Creates a function which serializes a <see cref="object"/> property value to a list of strings.
/// </summary>
/// <param name="get">A lambda function which retrieves the property value from a given source object.</param>
private static Func<TSource, IEnumerable<string>> CreateValueFetcher(Func<TSource, object> get)
=> obj => new[] { get(obj)?.ToString() };
public interface IProperty
{
string Name { get; }
Func<TSource, IEnumerable<string>> FetchValue { get; }
}
private class Property : IProperty
{
public string Name { get; set; }
public Func<TSource, IEnumerable<string>> FetchValue { get; set; }
}
}
}
An example of using either solution:
var url = new UriBuilder("test.com").SetQuerySlow(new
{
Days = new[] { WeekDay.Tuesday, WeekDay.Wednesday },
Time = TimeSpan.FromHours(14.5),
Link = "conferences.com/apple/stream/15",
Pizzas = default(int?)
}).Uri;
Output:
http://test.com/Days=Tuesday&Days=Wednesday&Time=14:30:00&Link=conferences.com%2Fapple%2Fstream%2F15
Neither of the solutions handle exotic types, indexed parameters, or nested parameters.
When manual serialization is simpler, this c#7/.net4.7 approach can help:
public static class QueryParameterExtensions
{
public static UriBuilder SetQuery(this UriBuilder builder, params (string Name, object Obj)[] parameters)
{
var list = parameters
.Select(parameter => new
{
parameter.Name,
Values = SerializeToList(parameter.Obj).Where(value => !string.IsNullOrEmpty(value))
})
.Where(parameter => parameter.Values.Any())
.SelectMany(parameter => parameter.Values.Select(item => Uri.EscapeDataString(parameter.Name) + '=' + Uri.EscapeDataString(item)));
builder.Query = string.Join("&", list);
return builder;
}
private static IEnumerable<string> SerializeToList(object obj)
{
switch (obj)
{
case string text:
yield return text;
break;
case IEnumerable list:
foreach (var item in list)
{
yield return SerializeToValue(item);
}
break;
default:
yield return SerializeToValue(obj);
break;
}
}
private static string SerializeToValue(object obj)
{
switch (obj)
{
case bool flag:
return flag ? "true" : null;
case byte number:
return number == default(byte) ? null : number.ToString();
case short number:
return number == default(short) ? null : number.ToString();
case ushort number:
return number == default(ushort) ? null : number.ToString();
case int number:
return number == default(int) ? null : number.ToString();
case uint number:
return number == default(uint) ? null : number.ToString();
case long number:
return number == default(long) ? null : number.ToString();
case ulong number:
return number == default(ulong) ? null : number.ToString();
case float number:
return number == default(float) ? null : number.ToString();
case double number:
return number == default(double) ? null : number.ToString();
case DateTime date:
return date == default(DateTime) ? null : date.ToString("s");
case TimeSpan span:
return span == default(TimeSpan) ? null : span.ToString();
case Guid guid:
return guid == default(Guid) ? null : guid.ToString();
default:
return obj?.ToString();
}
}
}
Example usage:
var uri = new UriBuilder("test.com")
.SetQuery(("days", standup.Days), ("time", standup.Time), ("link", standup.Link), ("pizzas", standup.Pizzas))
.Uri;
Output:
http://test.com/?days=Tuesday&days=Wednesday&time=14:30:00&link=conferences.com%2Fapple%2Fstream%2F15
In addition to existing answers
public static string ToQueryString<T>(this T input)
{
if (input == null)
{
return string.Empty;
}
var queryStringBuilder = new StringBuilder("?");
var properties = input.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
foreach (var property in properties)
{
var value = property.GetValue(input);
if (value is null || property.HasIgnoreDataMember())
continue;
queryStringBuilder.AppendFormat("{0}={1}&", property.GetName(), HttpUtility.UrlEncode(value.ToString()));
}
queryStringBuilder.Length--;
return queryStringBuilder.ToString();
}
private static bool HasIgnoreDataMember(this PropertyInfo propertyInfo)
{
return propertyInfo.GetCustomAttribute(typeof(IgnoreDataMemberAttribute), true) is not null;
}
private static DataMemberAttribute GetDataMemberAttribute(this PropertyInfo propertyInfo)
{
return propertyInfo.GetCustomAttribute<DataMemberAttribute>();
}
private static T GetCustomAttribute<T>(this PropertyInfo propertyInfo) where T : class
{
return propertyInfo.GetCustomAttribute(typeof(T), true) as T;
}
private static string GetName(this PropertyInfo propertyInfo)
{
return propertyInfo.GetDataMemberAttribute()?.Name ?? propertyInfo.Name;
}
}
Usage: var queryString = object.ToQueryString()
Faced with a similar situation what I did, is to XML serialize the object and pass it around as query string parameter.
The difficulty with this approach was that despite encoding, the receiving form throws exception saying "potentially dangerous request...". The way I got around was to encrypt the serialized object and then encode to pass it around as query string parameter. Which in turn made the query string tamper proof (bonus wandering into the HMAC territory)!
FormA XML serializes an object > encrypts the serialized string > encode > pass as query string to FormB
FormB decrypts the query parameter value (as request.querystring decodes also) > deserialize the resulting XML string to object using XmlSerializer.
I can share my VB.NET code upon request to howIdidit-at-applecart-dot-net
I am new to Reflection so please excuse my noob question. How can I create a Method that takes two Parameters, a Generic List and a String and then finds all items in that List where any property value matches the string.
So for example we have an object with 3 properties, I pass a list of this object to the method and a search string and it returns back a list of objects where any of the properties may contain the search string.
I can do like this :
var temp = list.AsQueryable().Where("SomeField == 1").Select("it");
But how can I make this method Generic so I can pass any List of Objects to it ?
Thanks in advance...
If you are using Dynamic Linq, try this
public static IEnumerable<T> Filter<T>(IEnumerable<T> source, string searchStr)
{
var propsToCheck = typeof (T).GetProperties().Where(a => a.PropertyType == typeof(string));
var filter = propsToCheck.Aggregate(string.Empty, (s, p) => (s == string.Empty ? string.Empty : string.Format("{0} OR ", s)) + string.Format("{0} == #0", p.Name));
var filtered = source.AsQueryable().Where(filter, searchStr);
return filtered;
}
Use Type.GetProperties() to get all the properties of an object. Use PropertyInfo.GetValue() to get the value of a given property in a given object. You need to figure out how you want a match your string to a DateTime, to numbers, or to other complex objects. Put it all into a function like bool IsMatch(this object obj, string val). Then you can filter your list like list.Where(x => x.IsMatch("something")).
Here you go mate:
private static void Main(string[] args)
{
var list = new List<object> {new {prop1 = "A", prop2 = "B"},new {prop3 = "B", prop4 = "C"}};
var subList = SearchForStringInProperties(list, "C");
}
private static IEnumerable<object> SearchForStringInProperties(IEnumerable<object> list, string searchString)
{
return from obj in list where FindStringInObjProperties(obj, searchString) select obj;
}
private static bool FindStringInObjProperties(object obj, string searchString)
{
return obj.GetType().GetProperties().Any(property => obj.GetType().GetProperty(property.Name).GetValue(obj).ToString().Equals(searchString));
}
If you just want to match the properties with same type as your argument, this extension method can help,
public static class ListExtensions
{
public static IEnumerable<T> MatchWithAnyProperty<T, TK>(this IEnumerable<T> list, TK value)
{
var argType = typeof (TK);
var properties = typeof(T).GetProperties().Where(x => x.PropertyType.IsAssignableFrom(argType));
return list.Where(item => properties.Any(prop =>
{
var propertyValue = prop.GetValue(item, null);
if (value == null)
return propertyValue == null;
return propertyValue.Equals(value);
}));
}
}
This can be used like,
var items = new[]
{
new
{
Name = "Test",
Age = 20,
Test=25
},
new
{
Name = "Hello",
Age = 10,
Test=15
},
new
{
Name = "T2gdhest",
Age = 14,
Test=20
},
new
{
Name = "hai",
Age = 33,
Test=10
},
new
{
Name = "why not",
Age = 10,
Test=33
},
};
var match= items.MatchWithAnyProperty(10);
foreach (var item in match)
{
Console.WriteLine(item.Name);
}
Console.ReadKey();
And there is the old way ...
public static IList<T> MyMethod<T>(IList<T> myList, string filter)
{
if (myList == null) return null;
if (filter == null) return myList;
var tfilter = filter.GetType();
var properties = typeof(T).GetProperties().Where(x => x.PropertyType.FullName == typeof(string).FullName);
if (!properties.Any()) return null;
var res = new List<T>();
foreach(var el in myList)
{
foreach(var p in properties)
{
if ((string)p.GetValue(el) == filter)
{
res.Add(el);
break;
}
}
}
return res;
}
Each item/string in my array starts with two letters followed by two or three numbers and then sometimes followed by another letter.
Examples, RS01 RS10 RS32A RS102 RS80 RS05A RS105A RS105B
I tried to sort this using the default Array.Sort but it came back with this...
RS01
RS05A
RS10
RS102
RS105A
RS105B
RS32A
RS80
But I need it like this..
RS01
RS05A
RS10
RS32A
RS80
RS102
RS105A
RS105B
Any Ideas?
Here is sorting with custom comparison delegate and regular expressions:
string[] array = { "RS01", "RS10", "RS32A", "RS102",
"RS80", "RS05A", "RS105A", "RS105B" };
Array.Sort(array, (s1, s2) =>
{
Regex regex = new Regex(#"([a-zA-Z]+)(\d+)([a-zA-Z]*)");
var match1 = regex.Match(s1);
var match2 = regex.Match(s2);
// prefix
int result = match1.Groups[1].Value.CompareTo(match2.Groups[1].Value);
if (result != 0)
return result;
// number
result = Int32.Parse(match1.Groups[2].Value)
.CompareTo(Int32.Parse(match2.Groups[2].Value));
if (result != 0)
return result;
// suffix
return match1.Groups[3].Value.CompareTo(match2.Groups[3].Value);
});
UPDATE (little refactoring, and moving all stuff to separate comparer class). Usage:
Array.Sort(array, new RSComparer());
Comparer itself:
public class RSComparer : IComparer<string>
{
private Dictionary<string, RS> entries = new Dictionary<string, RS>();
public int Compare(string x, string y)
{
if (!entries.ContainsKey(x))
entries.Add(x, new RS(x));
if (!entries.ContainsKey(y))
entries.Add(y, new RS(y));
return entries[x].CompareTo(entries[y]);
}
private class RS : IComparable
{
public RS(string value)
{
Regex regex = new Regex(#"([A-Z]+)(\d+)([A-Z]*)");
var match = regex.Match(value);
Prefix = match.Groups[1].Value;
Number = Int32.Parse(match.Groups[2].Value);
Suffix = match.Groups[3].Value;
}
public string Prefix { get; private set; }
public int Number { get; private set; }
public string Suffix { get; private set; }
public int CompareTo(object obj)
{
RS rs = (RS)obj;
int result = Prefix.CompareTo(rs.Prefix);
if (result != 0)
return result;
result = Number.CompareTo(rs.Number);
if (result != null)
return result;
return Suffix.CompareTo(rs.Suffix);
}
}
}
You can use this linq query:
var strings = new[] {
"RS01","RS05A","RS10","RS102","RS105A","RS105B","RS32A","RS80"
};
strings = strings.Select(str => new
{
str,
num = int.Parse(String.Concat(str.Skip(2).TakeWhile(Char.IsDigit))),
version = String.Concat(str.Skip(2).SkipWhile(Char.IsDigit))
})
.OrderBy(x => x.num).ThenBy(x => x.version)
.Select(x => x.str)
.ToArray();
DEMO
Result:
RS01
RS05A
RS10
RS32A
RS80
RS102
RS105A
RS105B
You'll want to write a custom comparer class implementing IComparer<string>; it's pretty straightforward to break your strings into components. When you call Array.Sort, give it an instance of your comparer and you'll get the results you want.