Develop Reference

How to get a custom attribute on enum by passing in the enum value and attribute type?

there are lots of examples online of creating a enum extension method that takes a enum value as an argument and in the method gets a specific attribute, like so:
namespace MVVMProj.ProjUtilities
{
public class EnumerationHelpers
{
public static string GetStatusText(this Enum value)
{
var type = value.GetType();
string name = Enum.GetName(type, value);
if (name == null) { return null; }
var field = type.GetField(name);
if (field == null) { return null; }
var attr = Attribute.GetCustomAttribute(field, typeof(StatusTextAttribute)) as StatusTextAttribute;
if (attr == null) { return null; }
return attr.StatusText;
}
}
}
What I'm wondering is, is there a way to also pass the method the attribute type, so I don't need to keep writing specific methods for each different attribute?
This is unfinished, but, it should give you the idea of what I'm trying to achieve:
namespace MVVMProj.ProjUtilities
{
public class EnumerationHelpers
{
public static string GetCustomAttribute(this Enum value, Type customAttr)
//Or instead of passing a Type, a string of the attribute's name
{
var type = value.GetType();
string name = Enum.GetName(type, value);
if (name == null) { return null; }
var field = type.GetField(name);
if (field == null) { return null; }
var attr = Attribute.GetCustomAttribute(field, ....) as ....;
if (attr == null) { return null; }
return attr....;
}
}
}
I suppose I can't just return a string either as it could be any data type.
Some generic method maybe?
Any advice would be greatly appreciated!
Edit: Usage:
It is iterating over the enum creating a dictionary so I can display the values in a combobox. It only adds the item if the attribute matches the condition in the if statement.
One more thing to note is that the custom attribute is an enum as well.
Aybe: the 'item' is only an object upon the iteration so I do a cast. Though I am getting an error in the if statement, it trying to compare CaseTypeAttribute to an actual CaseType enum value, what do I need to do to resolve?
Error:
Severity Code Description Project File Line Suppression State
Error CS0019 Operator '==' cannot be applied to operands of type 'SBC.CaseTypeAttribute' and 'SBC.CaseType'
private Dictionary<int, string> _substancetypes;
public Dictionary<int, string> SubstanceTypes
{
get
{
if (_substancetypes == null)
{
_substancetypes = new Dictionary<int, string>();
foreach (var item in Enum.GetValues(typeof(SBC.SubstanceTypeCode)))
{
var descriptionAttribute = ((SBC.SubstanceTypeCode)item).GetAttribute<SBC.CaseTypeAttribute>();
if (descriptionAttribute != null &&
descriptionAttribute == SBC.CaseType.Exposures) //Error here
{
_substancetypes.Add((int)item, CTS_MVVM.CTS_Utilities.EnumerationHelpers.GetDescriptionFromEnumValue((SBC.SubstanceTypeCode)item));
}
}
}
return _substancetypes;
}
}

Something like this?
using System;
using System.ComponentModel;
using System.Reflection;
namespace ConsoleApp1
{
internal static class Program
{
private static void Main(string[] args)
{
var descriptionAttribute = MyEnum.A.GetAttribute<DescriptionAttribute>();
}
}
public static class EnumExtensions
{
public static T GetAttribute<T>(this Enum #enum) where T : Attribute
{
var type = #enum.GetType();
var name = Enum.GetName(type, #enum);
var field = type.GetField(name);
var attribute = field.GetCustomAttribute<T>();
return attribute;
}
}
public enum MyEnum
{
[Description("A")] A,
[Description("B")] B
}
}

Access Enum custom attributes whilst looping over values

I have added a custom attribute to some enum values (to give them a screen friendly string value). I am trying to build a list of SelectListItems for use on an MVC page, but I am running into trouble accessing the custom attribute.
My enum looks like this.
public enum MyEnum
{
[StringValue("None")] None = 0,
[StringValue("First Value")] FirstValue = 1,
[StringValue("Second Value")] SecondValue = 2
}
The attribute looks like this.
public class StringValueAttribute : Attribute
{
public StringValueAttribute(string value)
{
this.StringValue = value;
}
public string StringValue { get; protected set; }
}
I created a helper class so that I can easily access the StringValue attribute from an instance of the Enum.
public static string GetStringValue(this Enum value)
{
Type type = value.GetType();
FieldInfo fieldInfo = type.GetField(value.ToString());
StringValueAttribute[] attribs = fieldInfo.GetCustomAttributes(typeof(StringValueAttribute), false) as StringValueAttribute[];
return attribs != null && attribs.Length > 0 ? attribs[0].StringValue : null;
}
I could call it like this.
MyEnum test = MyEnum.FirstValue;
string stringValue = test.GetStringValue();
Finally, onto the code I am stuck with. I can loop over the Enum Values easily, but the values are not instances of MyEnum so I cannot call my helper function. And when I try to access the FieldInfo it always returns null. Here is what I have so far.
public static List<SelectListItem> GetFlagsSelectList<T>(int? selectedValue)
{
List<SelectListItem> items = new List<SelectListItem>();
foreach (int value in Enum.GetValues(typeof(T)))
{
items.Add(new SelectListItem
{
Text = Enum.GetName(typeof(T), value),
Value = value.ToString(),
Selected = selectedValue.HasValue && selectedValue.Value == value
});
}
return items;
}
Is it possible to access the custom attribute within the foreach loop?
EDIT:
I think I asked this unclearly. I would like to access the custom attribute inside the foreach loop. Calling Enum.GetName(typeof(T), value) simply returns the name of the property (e.g. FirstValue) which I do NOT want.
I would like to do something like:
foreach (int value in Enum.GetValues(typeof(T)))
{
string name = Enum.ToObject(typeof (T), value).GetStringValue();
}
But T could be any type so I can't call my GetStringValue() method there.
I have tried doing this:
foreach (int value in Enum.GetValues(typeof(T)))
{
FieldInfo fieldInfo = typeof(T).GetField(value.ToString());
StringValueAttribute[] attribs = fieldInfo.GetCustomAttributes(typeof(StringValueAttribute), false) as StringValueAttribute[];
string name = attribs != null && attribs.Length > 0 ? attribs[0].StringValue : Enum.GetName(typeof(T), value),;
items.Add(new SelectListItem
{
Text = name,
Value = value.ToString(),
Selected = selectedValue.HasValue && selectedValue.Value == value
});
}
But I always get an exception because the FieldInfo object always returns null.

Try
static string GetStringValue2(Enum value) {
....
}
public static List<SelectListItem> GetFlagsSelectList<T>(int? selectedValue) where T : struct {
var items = new List<SelectListItem>();
foreach (T value in Enum.GetValues(typeof(T))) {
var stringValue = GetStringValue2((Enum)(object)value);
items.Add(new SelectListItem {
Text = Enum.GetName(typeof(T), value),
Value = Convert.ToInt32(value).ToString(),
Selected = selectedValue.HasValue && selectedValue.Value == Convert.ToInt32(value)
});
}
return items;
}

I wrote a blog post about this a while back (for the XmlEnumAttribute, but the same applies here).
public static string ConvertToString(Enum e)
{
// Get the Type of the enum
Type t = e.GetType();
// Get the FieldInfo for the member field with the enums name
FieldInfo info = t.GetField(e.ToString("G"));
// Check to see if the XmlEnumAttribute is defined on this field
if (!info.IsDefined(typeof(XmlEnumAttribute), false))
{
// If no XmlEnumAttribute then return the string version of the enum.
return e.ToString("G");
}
// Get the XmlEnumAttribute
object[] o = info.GetCustomAttributes(typeof(XmlEnumAttribute), false);
XmlEnumAttribute att = (XmlEnumAttribute)o[0];
return att.Name;
}
Hope that helps.

How to get all descriptions of enum values with reflection?

So I need to get a List<string> from my enum
Here is what I have done so far:
enum definition
[Flags]
public enum ContractorType
{
[Description("Recipient")]
RECIPIENT = 1,
[Description("Deliver")]
DELIVER = 2,
[Description("Recipient / Deliver")]
RECIPIENT_DELIVER = 4
}
HelperClass with method to do what I need:
public static class EnumUtils
{
public static IEnumerable<string> GetDescrptions(Type enumerator)
{
FieldInfo[] fi = enumerator.GetFields();
List<DescriptionAttribute> attributes = new List<DescriptionAttribute>();
foreach (var i in fi)
{
try
{
yield return attributes.Add(((DescriptionAttribute[])i.GetCustomAttributes(
typeof(DescriptionAttribute),
false))[0]);
}
catch { }
}
return new List<string>{"empty"};
}
}
Now in the line where I yield values, I got a NullReferenceException. Did I miss something? The syntax looks all right to me, but maybe I overlooked something?
Edit:
I'm using .net Framework 4.0 here.

This generic static method works fine for getting a list of descriptions for each value of an enum type of T:
public static IEnumerable<string> GetDescriptions<T>()
{
var attributes = typeof(T).GetMembers()
.SelectMany(member => member.GetCustomAttributes(typeof (DescriptionAttribute), true).Cast<DescriptionAttribute>())
.ToList();
return attributes.Select(x => x.Description);
}

I created these extension methods
public static class EnumExtender
{
public static string GetDescription(this Enum enumValue)
{
string output = null;
Type type = enumValue.GetType();
FieldInfo fi = type.GetField(enumValue.ToString());
var attrs = fi.GetCustomAttributes(typeof(DescriptionAttribute), false) as DescriptionAttribute[];
if (attrs.Length > 0) output = attrs[0].Description;
return output;
}
public static IDictionary<T, string> GetEnumValuesWithDescription<T>(this Type type) where T : struct, IConvertible
{
if (!type.IsEnum)
{
throw new ArgumentException("T must be an enumerated type");
}
return type.GetEnumValues()
.OfType<T>()
.ToDictionary(
key => key,
val => (val as Enum).GetDescription()
);
}
}
Usage
var stuff = typeof(TestEnum).GetEnumValuesWithDescription<TestEnum>();
Will return a Dictionary<TestEnum, string> with value as keys and descriptions as values. If you want just a list, you can change .ToDictionary to
.Select(o => (o as Enum).GetDescription())
.ToList()

Here is a small reusable solution. This is an abstract class which will extract all the attributes of type K from type T.
abstract class AbstractAttributes<T, K>
{
protected List<K> Attributes = new List<K>();
public AbstractAttributes()
{
foreach (var member in typeof(T).GetMembers())
{
foreach (K attribute in member.GetCustomAttributes(typeof(K), true))
Attributes.Add(attribute);
}
}
}
Should we now want to extract only attributes of DescriptionAttribute type, we would use the following class.
class DescriptionAttributes<T> : AbstractAttributes<T, DescriptionAttribute>
{
public List<string> Descriptions { get; set; }
public DescriptionAttributes()
{
Descriptions = Attributes.Select(x => x.Description).ToList();
}
}
This class will extract only attributes of DescriptionAttribute type from the type T. But to actually use this class in you context you will simply need to do the following.
new DescriptionAttributes<ContractorType>().Descriptions.ForEach(x => Console.WriteLine(x));
This line of code will write out all the descriptions you used as parameters in your attributes of type DescriptionAttribute. Should you need to extract some other attributes, just create a new class that derives from the AbstractAttributes<T, K> class and close its type K with the appropriate attribute.

You need to find the DescriptionAttribute on each field, if it exists and then retrieve the Description attribute e.g.
return enumType.GetFields()
.Select(f => (DescriptionAttribute)f.GetCustomAttribute(typeof(DescriptionAttribute)))
.Where(a => a != null)
.Select(a => a.Description)
If you could have multiple descriptions on a field, you could do something like:
FieldInfo[] fields = enumType.GetFields();
foreach(FieldInfo field in fields)
{
var descriptionAttributes = field.GetCustomAttributes(false).OfType<DescriptionAttribute>();
foreach(var descAttr in descriptionAttributes)
{
yield return descAttr.Description;
}
}
which is more similar to your existing approach.

It think this can solve your problem. If it is not implemented you can return null or an exception. It depends what you need.
public DescriptionAttribute GetDescription(ContractorType contractorType)
{
MemberInfo memberInfo = typeof(ContractorType).GetMember(contractorType.ToString())
.FirstOrDefault();
if (memberInfo != null)
{
DescriptionAttribute attribute = (DescriptionAttribute)
memberInfo.GetCustomAttributes(typeof(DescriptionAttribute), false)
.FirstOrDefault();
return attribute;
}
//return null;
//or
throw new NotImplementedException("There is no description for this enum");
}
So you will use it like this :
DescriptionAttribute attribute = GetDescription(ContractorType.RECIPIENT);
Sorry that I didn't read your question. Here is some code that you can use to take all of the description strings:
public IEnumerable<string> GetAllDescriptionInText()
{
List<string> descList = new List<string>();
foreach (DescriptionAttribute desc in Enum.GetValues(typeof(DescriptionAttribute)))
{
descList.Add(GetDescription(desc).Value);
}
return descList;
}

You can try this
public string ContractorTypeDescription(Enum ContractorType)
{
FieldInfo fi = ContractorType.GetType().GetField(ContractorType.ToString());
var attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
if (attributes.Length > 0)
{
return attributes[0].Description;
}
else
{
return ContractorType.ToString();
}
}

This is Dictionary not List
But is is something I use
using System.ComponentModel;
using System.Reflection;
using MyExtensions;
namespace MyExtensions
{
public static class Extension
{
public static string GetDescriptionName(this Enum value)
{
Type type = value.GetType();
string name = Enum.GetName(type, value);
if (name == null)
return null;
else
{
FieldInfo field = type.GetField(name);
if (field == null)
return name;
else
{
DescriptionAttribute attr =
Attribute.GetCustomAttribute(field,
typeof(DescriptionAttribute)) as DescriptionAttribute;
if (attr == null)
return name;
else
return attr.Description;
}
}
}
}
}
namespace EnumDescription
{
class Program
{
public enum enumDateCond : byte
{
[Description("Empty")]
Null = 0,
[Description("Not Empty")]
NotNull = 1,
EQ = 2,
LT = 3,
LE = 4,
GE = 14,
GT = 15
};
static void Main(string[] args)
{
enumDateCond x = enumDateCond.Null;
string description = x.GetDescriptionName();
foreach (enumDateCond enm in Enum.GetValues(typeof(enumDateCond)))
{
description = enm.GetDescriptionName();
Console.WriteLine(description);
}
Console.WriteLine("Dictionary");
Dictionary<enumDateCond, string> DLenumDateCond = EnumToDictionary<enumDateCond>();
foreach(enumDateCond key in DLenumDateCond.Keys)
{
Console.WriteLine(key.ToString() + " " + DLenumDateCond[key]);
}
}
public static Dictionary<T, string> EnumToDictionary<T>()
where T : struct
{
Type enumType = typeof(T);
// Can't use generic type constraints on value types,
// so have to do check like this
if (enumType.BaseType != typeof(Enum))
throw new ArgumentException("T must be of type System.Enum");
Dictionary<T, string> enumDL = new Dictionary<T, string>();
foreach (T enm in Enum.GetValues(enumType))
{
string name = Enum.GetName(enumType, enm);
if (name != null)
{
FieldInfo field = enumType.GetField(name);
if (field != null)
{
DescriptionAttribute attr =
Attribute.GetCustomAttribute(field,
typeof(DescriptionAttribute)) as DescriptionAttribute;
if (attr != null)
name = attr.Description;
}
}
enumDL.Add(enm, name);
}
return enumDL;
}
}
}

Access to the value of a Custom Attribute

I've got this custom attribute:
[AttributeUsage(AttributeTargets.Method, AllowMultiple=false, Inherited = true)]
class MethodTestingAttibute : Attribute
{
public string Value{ get; private set; }
public MethodTestingAttibute (string value)
{
this.Value= value;
}
}
To be used like this:
[MethodTestingAttibute("2")]
public int m1() {return 3; }
And my difficulty is to take the value of "2" of MethodTestingAttibute
object result = method.Invoke(obj, new Type[] {}); // here i get the return
Now I want to compare this result to the value of MethodTestingAttibute. How can I do that? I'm trying to go up to this road but without success:
method.GetCustomAttributes(typeof(MethodTestAttibute), true)[0]...
What is the proper way to get access to the field of the custom attribute?

var attribute =
(MethodTestingAttibute)
typeof (Vehicles)
.GetMethod("m1")
.GetCustomAttributes(typeof (MethodTestingAttibute), false).First();
Console.WriteLine(attribute.Value);

With my custom attribute:
[AttributeUsage(AttributeTargets.Method)]
public class AttributeCustom : Attribute
{
public string MyPropertyAttribute { get; private set; }
public AttributeCustom(string myproperty)
{
this.MyPropertyAttribute = myproperty;
}
}
I create a method for to get attribute with his values:
public static AttributeCustom GetAttributeCustom<T>(string method) where T : class
{
try
{
return ((AttributeCustom)typeof(T).GetMethod(method).GetCustomAttributes(typeof(AttributeCustom), false).FirstOrDefault());
}
catch(SystemException)
{
return null;
}
}
With a example class (must be not static because T is generic)
public class MyClass
{
[AttributeCustom("value test attribute")])
public void MyMethod()
{
//...
}
}
Usage:
var customAttribute = GetAttributeCustom<MyClass>("MyMethod");
if (customAttribute != null)
{
Console.WriteLine(customAttribute.MyPropertyAttribute);
}

Cast the object to MethodTestingAttibute:
object actual = method.Invoke(obj, null);
MethodTestingAttibute attribute = (MethodTestingAttibute)method.GetCustomAttributes(typeof(MethodTestAttribute), true)[0];
string expected = attribute.Value;
bool areEqual = string.Equals(expected, actual != null ? actual.ToString() : null, StringComparison.Ordinal);

To get the value of an attribute property, just cast the object returned by GetCustomAttributes():
{
string val;
object[] atts = method.GetCustomAttributes(typeof(MethodTestAttibute), true);
if (atts.Length > 0)
val = (atts[0] as MethodTestingAttibute).Value;
}

Necromancing.
For those that still have to maintain .NET 2.0, or those that want to do it without LINQ:
public static object GetAttribute(System.Reflection.MemberInfo mi, System.Type t)
{
object[] objs = mi.GetCustomAttributes(t, true);
if (objs == null || objs.Length < 1)
return null;
return objs[0];
}
public static T GetAttribute<T>(System.Reflection.MemberInfo mi)
{
return (T)GetAttribute(mi, typeof(T));
}
public delegate TResult GetValue_t<in T, out TResult>(T arg1);
public static TValue GetAttributValue<TAttribute, TValue>(System.Reflection.MemberInfo mi, GetValue_t<TAttribute, TValue> value) where TAttribute : System.Attribute
{
TAttribute[] objAtts = (TAttribute[])mi.GetCustomAttributes(typeof(TAttribute), true);
TAttribute att = (objAtts == null || objAtts.Length < 1) ? default(TAttribute) : objAtts[0];
// TAttribute att = (TAttribute)GetAttribute(mi, typeof(TAttribute));
if (att != null)
{
return value(att);
}
return default(TValue);
}
Example usage:
System.Reflection.FieldInfo fi = t.GetField("PrintBackground");
wkHtmlOptionNameAttribute att = GetAttribute<wkHtmlOptionNameAttribute>(fi);
string name = GetAttributValue<wkHtmlOptionNameAttribute, string>(fi, delegate(wkHtmlOptionNameAttribute a){ return a.Name;});
or in your case simply
MethodInfo mi = typeof(Vehicles).GetMethod("m1");
string aValue = GetAttributValue<MethodTestingAttibute, string>(mi, a => a.Value);

Check the code here http://msdn.microsoft.com/en-us/library/bfwhbey7.aspx
Excerpt:
// Get the AClass type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for Win32CallMethod.
MethodInfo mInfo = clsType.GetMethod("Win32CallMethod");
if (mInfo != null)
{
// Iterate through all the attributes of the method.
foreach(Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the Obsolete attribute.
if (attr.GetType() == typeof(ObsoleteAttribute))
{
Console.WriteLine("Method {0} is obsolete. " +
"The message is:",
mInfo.Name);
Console.WriteLine(" \"{0}\"",
((ObsoleteAttribute)attr).Message);
}
// Check for the Unmanaged attribute.
else if (attr.GetType() == typeof(UnmanagedAttribute))
{
Console.WriteLine(
"This method calls unmanaged code.");
Console.WriteLine(
String.Format("The Unmanaged attribute type is {0}.",
((UnmanagedAttribute)attr).Win32Type));
AClass myCls = new AClass();
myCls.Win32CallMethod();
}
}
}

Custom attribute on property - Getting type and value of attributed property

I have the following custom attribute, which can be applied on properties:
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class IdentifierAttribute : Attribute
{
}
For example:
public class MyClass
{
[Identifier()]
public string Name { get; set; }
public int SomeNumber { get; set; }
public string SomeOtherProperty { get; set; }
}
There will also be other classes, to which the Identifier attribute could be added to properties of different type:
public class MyOtherClass
{
public string Name { get; set; }
[Identifier()]
public int SomeNumber { get; set; }
public string SomeOtherProperty { get; set; }
}
I then need to be able to get this information in my consuming class.
For example:
public class TestClass<T>
{
public void GetIDForPassedInObject(T obj)
{
var type = obj.GetType();
//type.GetCustomAttributes(true)???
}
}
What's the best way of going about this?
I need to get the type of the [Identifier()] field (int, string, etc...) and the actual value, obviously based on the type.

Something like the following,, this will use only the first property it comes accross that has the attribute, of course you could place it on more than one..
public object GetIDForPassedInObject(T obj)
{
var prop = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)
.FirstOrDefault(p => p.GetCustomAttributes(typeof(IdentifierAttribute), false).Count() ==1);
object ret = prop !=null ? prop.GetValue(obj, null) : null;
return ret;
}

public class TestClass<T>
{
public void GetIDForPassedInObject(T obj)
{
PropertyInfo[] properties =
obj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
PropertyInfo IdProperty = (from PropertyInfo property in properties
where property.GetCustomAttributes(typeof(Identifier), true).Length > 0
select property).First();
if(null == IdProperty)
throw new ArgumentException("obj does not have Identifier.");
Object propValue = IdProperty.GetValue(entity, null)
}
}

A bit late but here is something I did for enums (could be any object also) and getting the description attribute value using an extension (this could be a generic for any attribute):
public enum TransactionTypeEnum
{
[Description("Text here!")]
DROP = 1,
[Description("More text here!")]
PICKUP = 2,
...
}
Getting the value:
var code = TransactionTypeEnum.DROP.ToCode();
Extension supporting all my enums:
public static string ToCode(this TransactionTypeEnum val)
{
return GetCode(val);
}
public static string ToCode(this DockStatusEnum val)
{
return GetCode(val);
}
public static string ToCode(this TrailerStatusEnum val)
{
return GetCode(val);
}
public static string ToCode(this DockTrailerStatusEnum val)
{
return GetCode(val);
}
public static string ToCode(this EncodingType val)
{
return GetCode(val);
}
private static string GetCode(object val)
{
var attributes = (DescriptionAttribute[])val.GetType().GetField(val.ToString()).GetCustomAttributes(typeof(DescriptionAttribute), false);
return attributes.Length > 0 ? attributes[0].Description : string.Empty;
}

Here is a more real-word example. We use an extension method and check if a property contains a FieldMetaDataAttribute (a custom attribute in my source code base)
with valid Major and MinorVersion. What is of general interest is the part where we use the parent class type and GetProperties and retrieve the ProperyInfo and then use GetCustomAttribute to retrieve a attribute FieldMetaDataAttribute in this special case. Use this code for inspiration how to do more generic way of retrieving a custom attribute. This can of course be polished to make a general method to retrieve a given attribute of any property of a class instance.
/// <summary>
/// Executes the action if not the field is deprecated
/// </summary>
/// <typeparam name="TProperty"></typeparam>
/// <typeparam name="TForm"></typeparam>
/// <param name="form"></param>
/// <param name="memberExpression"></param>
/// <param name="actionToPerform"></param>
/// <returns>True if the action was performed</returns>
public static bool ExecuteActionIfNotDeprecated<TForm, TProperty>(this TForm form, Expression<Func<TForm, TProperty>> memberExpression, Action actionToPerform)
{
var memberExpressionConverted = memberExpression.Body as MemberExpression;
if (memberExpressionConverted == null)
return false;
string memberName = memberExpressionConverted.Member.Name;
PropertyInfo matchingProperty = typeof(TForm).GetProperties(BindingFlags.Public | BindingFlags.Instance)
.FirstOrDefault(p => p.Name == memberName);
if (matchingProperty == null)
return false; //should not occur
var fieldMeta = matchingProperty.GetCustomAttribute(typeof(FieldMetadataAttribute), true) as FieldMetadataAttribute;
if (fieldMeta == null)
{
actionToPerform();
return true;
}
var formConverted = form as FormDataContract;
if (formConverted == null)
return false;
if (fieldMeta.DeprecatedFromMajorVersion > 0 && formConverted.MajorVersion > fieldMeta.DeprecatedFromMajorVersion)
{
//major version of formConverted is deprecated for this field - do not execute action
return false;
}
if (fieldMeta.DeprecatedFromMinorVersion > 0 && fieldMeta.DeprecatedFromMajorVersion > 0
&& formConverted.MinorVersion >= fieldMeta.DeprecatedFromMinorVersion
&& formConverted.MajorVersion >= fieldMeta.DeprecatedFromMajorVersion)
return false; //the field is expired - do not invoke action
actionToPerform();
return true;
}