CreateDelegate(Type, Instance, MethodInfo)

Tech-Archive recommends: Fix windows errors by optimizing your registry

Hi there,

I am working on a class library that should incpect a given class,
make a delegate to a get Property and use it later on.
Here is the code snippet:

public delegate int MyClassDelegate(MyClass cls);

....

public MyClassDelegate GetGetDelegate(MyClass cls, string memberName)
{
Type objType = cls.GetType();
PropertyInfo propInfo = objType.GetProperty(memberName);
if (propInfo != null)
{
MethodInfo methodInfo = propInfo.GetGetMethod();
if (methodInfo != null)
{
/*1*/ Type dlgType = typeof(MyClassDelegate);
/*2*/ return (MyClassDelegate)Delegate.CreateDelegate(dlgType,
null, methodInfo);
}
else
return null;
}
else
return null;
}

....

Then lather on:


ClassName cls = ...;
string memberName = ...;

ClassDelegate dlg = GetGetDelegate(cls, memberName);

foreach( ClassName c in list)
{
int x = dlg(c);
...
}



Everything works fine.

However, I would like to avoid explicit usage of MyClass and
MyClassDelegate
There is enough information in MethodInfo above to create a delegate.


So, GetGetDelegate() should be:



public Delegate GetGetDelegate(string className, string memberName)
{
Type objType = Type.GetType(className);
...

/*1*/ Type dlgType = CreateDelegateType(methodInfo);
/*2*/ return Delegate.CreateDelegate(dlgType, null, methodInfo);

...
}



The CreateDelegateType() returns the appropriate type of the
MethodInfo.


That works fine too.



But how can I use a delegate now?



Delegate dlg = GetGetDelegate(cls, memberName);

// HOW TO CALL dlg ?


Note that I use this approach mainly because of performance, as
delegate direct call is much faster than dynamic invocation.

Thank you.

.

Relevant Pages