How to Invoke Generic Methods with Dynamic Type Arguments in C# using Reflection?

Calling Generic Methods with Dynamic Type Arguments

In C#, calling generic methods with type arguments known only at execution time requires leveraging reflection capabilities. The original challenge involved looping through interfaces in a specific namespace and invoking a generic method using these interfaces as arguments.

To overcome this, follow these steps:

1. Locate the Generic Method: Use Type.GetMethod to retrieve the generic method information.
2. Make the Method Generic: Employ MakeGenericMethod to create a specialized version of the generic method for the desired type.
3. Invoke the Method: Call Invoke on the generated method to execute it.

For instance, consider the following code:

// Get the generic method
MethodInfo method = typeof(Test).GetMethod("CallMe");

// Get the list of interfaces in the specified namespace
var types = typeof(Test).Assembly
    .GetTypes()
    .Where(t => t.Namespace == "Interfaces");

// Loop through the interfaces
foreach (Type type in types)
{
    // Create a specialized generic method
    MethodInfo genericMethod = method.MakeGenericMethod(type);

    // Invoke the method with no target or arguments
    genericMethod.Invoke(null, null);
}

In this example, we retrieve the "CallMe" generic method, create specialized versions for each interface type, and invoke them reflectively.

Note: If the interface type you're dealing with is itself generic, use MakeGenericType instead of MakeGenericMethod, passing in the appropriate type arguments.

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