Ty. Ty. - 20 days ago 7
C# Question

Getting a delegate from methodinfo

I have a drop down list that is populated by inspecting a class's methods and including those that match a specific signature. The problem is in taking the selected item from the list and getting the delegate to call that method in the class. The first method works, but I cannot figure out part of the second.

For example,

public delegate void MyDelegate(MyState state);

public static MyDelegate GetMyDelegateFromString(string methodName)
{
switch (methodName)
{
case "CallMethodOne":
return MyFunctionsClass.CallMethodOne;
case "CallMethodTwo":
return MyFunctionsClass.CallMethodTwo;
default:
return MyFunctionsClass.CallMethodOne;
}
}

public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;

Type inf = typeof(MyFunctionsClass);
foreach (var method in inf.GetMethods())
{
if (method.Name == methodName)
{
//function = method;
//how do I get the function to call?
}
}

return function;
}


How do I get the commented out section of the second method to work? How do I cast the
MethodInfo
into the delegate?

Thanks!

Edit: Here is the working solution.

public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;

Type inf = typeof(MyFunctionsClass);
foreach (var method in inf.GetMethods())
{
if (method.Name == methodName)
{
function = (MyDelegate)Delegate.CreateDelegate(typeof(MyDelegate), method);
}
}

return function;
}

Answer

You'll need to call some form of Delegate.CreateDelegate(), depending on whether the method in question is a static or instance method.

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