I need to be able to pass an arbitrary method to some function myFunction
:
void myFunction(AnyFunc func) { ... }
It should be possible to execute it with other static, instance, public or private methods or even delegates:
myFunction(SomeClass.PublicStaticMethod);
myFunction(SomeObject.PrivateInstanceMethod);
myFunction(delegate(int x) { return 5*x; });
Passed method may have any number of parameters and any return type. It should also be possible to learn the actual number of parameters and their types in myFunction
via reflection. What would be AnyFunc
in the myFunction
definition to accommodate such requirements? It is acceptible to have several overloaded versions of the myFunction
.
Because the instantiated delegate is an object, it can be passed as an argument, or assigned to a property. This allows a method to accept a delegate as a parameter, and call the delegate at some later time.
In C#, we can also pass a method as a parameter to a different method using a delegate. We use the delegate keyword to define a delegate. Here, Name is the name of the delegate and it is taking parameter. Suppose we have a delegate having int as the parameter.
A delegate can be declared using the delegate keyword followed by a function signature, as shown below. The following declares a delegate named MyDelegate . public delegate void MyDelegate(string msg); Above, we have declared a delegate MyDelegate with a void return type and a string parameter.
A delegate is a type that represents references to methods with a particular parameter list and return type. When you instantiate a delegate, you can associate its instance with any method with a compatible signature and return type. You can invoke (or call) the method through the delegate instance.
The Delegate
type is the supertype of all other delegate types:
void myFunction(Delegate func) { ... }
Then, func.Method
will give you a MethodInfo
object you can use to inspect the return type and parameter types.
When calling the function you will have to explicitly specify which type of delegate you want to create:
myFunction((Func<int, int>) delegate (int x) { return 5 * x; });
Some idea of what you're trying to accomplish at a higher level would be good, as this approach may not turn out to be ideal.
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