CODEWITHSUNDEEP
c#reflectionproperties
czubehead
czubehead

Reputation: 552

C# reflection generic property type

Say that I have a class like this:

public class TestClass <T>
{
    public T Prop { get; set; }
}

I'm trying to identify that the property type is T, not the actual type that is passed e.g. int In order to clarify it a bit more:

TestClass<int> tc=new TestClass<int>();
tc.GetType().GetProperty("prop").PropertyType.Name; //this returns int, but I need "T"

Upvotes: 1

Views: 1328

Answers (2)

Gediminas Masaitis
Gediminas Masaitis

Reputation: 3212

Note that if you are are using C# 6, and require the generic type argument's name within it's defining class, you can get away without using reflection at all: 

var name = nameof(T);  // "T"

If you need the the generic type argument's name outside of it's class, you will need to use reflection (see Luaan's answer.)

Upvotes: 3

Luaan
Luaan

Reputation: 63722

When you create a TestClass<int> instance, you have a reified generic type - the property is int, not T.

To get at the actual generic type, you can use GetGenericTypeDefinition:

var genericType = tc.GetType().GetGenericTypeDefinition();
var typeName = genericType.GetProperty("Prop").PropertyType.Name;

And if you want to distinguish between actual types and generic type arguments, you can use Type.IsGenericParameter:

genericType.GetProperty("Prop").PropertyType.IsGenericParameter // true

Upvotes: 5

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