CODEWITHSUNDEEP
c#.netgenericsreflection.net-4.5.2
h0tfus3
h0tfus3

Reputation: 592

Calling generic ambiguous method using string with qualified name of a class

Assuming that I have a third party class Foo with a signature like this:

void Execute<T>();
void Execute(string[] args);

Instead of calling

Execute<Bar>();

I need to use the qualified name of the Bar classe to invoke the generic method. Example:

Type barType = Type.GetType("Program.Bar");
Execute<barType>();

I've already tried some answers I found on other threads but all of them gave me issues. For instance, I can't use the GetMethod("Execute") since it throws an ambiguous excpetion.

Upvotes: 1

Views: 226

Answers (2)

Rob
Rob

Reputation: 27357

You can run it like this:

class A 
{
    public void Execute<T>() { }
    public void Execute(string[] args) { }
}

var method = typeof(A).GetMethods().FirstOrDefault(
    m => m.Name == "Execute" 
    && !m.GetParameters().Any()
    && m.GetGenericArguments().Count() == 1
    );

Type barType = Type.GetType("Program.Bar");

method.MakeGenericMethod(barType).Invoke();

You can either change FirstOrDefault to First, or add some error handling if null is expected (depends on your use case).

Upvotes: 1

moarboilerplate
moarboilerplate

Reputation: 1643

Type parameters have to be known at compile time, so in order to call the method directly, you will need to either wrap the type or change the signature to take in a type.

Otherwise, you will need to use reflection to invoke the method by name.

Upvotes: 0

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