通过反射调用方法失败

Question

I try to call a method using reflection but method is not called. Below is my code:

private abstract class A<T>
{
    public abstract void DoSomething(string asd, T obj);
}

private class MyClass : A<int>
{
    public override void DoSomething(string asd, int obj)
    {
        Console.WriteLine(obj);
    }
}

static void Main(string[] args)
{
    Type unboundGenericType = typeof(A<>);
    Type boundGenericType = unboundGenericType.MakeGenericType(typeof(int));
    MethodInfo doSomethingMethod = boundGenericType.GetMethod("DoSomething");
    object instance = Activator.CreateInstance(boundGenericType);
    doSomethingMethod.Invoke(instance, new object[] {"Hello", 123});
}

I also tried to call the usual method, but also errors :(.

Answer 1

You retrieve the method on a wrong type. The method DoSomething has been implemented in MyClass and not on the generic type you bound.

If you try the following, you will the result you are looking for:

Type myClass = typeof(MyClass);
MethodInfo doSomethingMethod = myClass.GetMethod("DoSomething");
object instance = Activator.CreateInstance(myClass);
doSomethingMethod.Invoke(instance, new object[] { "Hello", 123 });