Accessing GenericTypeParameters of generic type in C#

I want to generate the name of the generic class with their declared parameter names. For example if I have generic class and instantiated ones like shown below I want to print "MyClass<P1,M>". 

class MyClass<P1, M1> {}
// ... some code removed here
var myInstance = new MyClass<int,string>();

Now I get my type information for myInstance and then generic type definition like this:

// MyClass<int,string> type info here
var type = myInstance.GetType();
 // MyClass<P1, M1> type info here
var genericType = type.GetGenericTypeDefinition();

Debugger shows genericType property GenericTypeParameters with all parameter names and type info. However I cannot access that collection from my C# code and casting genericType to System.RuntimeType class does not work because RuntimeType is internal.

So is there a way to access GenericTypeParameters property somehow or am I SOL here? Environment VS2015, .NET 4.6.1

Jon Skeet
people
quotationmark

I think you're just looking for Type.GetGenericArguments, which you should call on genericType rather than type - at that point, the type "arguments" are really the type parameters because it's an open type.

Sample (using Dictionary<,> for simplicity):

using System;
using System.Collections.Generic;

class Test
{
    static void Main()
    {
        var dictionary = new Dictionary<string, int>();
        var type = dictionary.GetType();
        var genericType = type.GetGenericTypeDefinition();
        foreach (var typeArgument in genericType.GetGenericArguments())
        {
            // TKey, then TValue
            Console.WriteLine(typeArgument);
        }
    }
}

Hopefully with that information you can work out the string formatting etc yourself.

people

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