Pass Method as Parameter using C#

Question

Pass Method as Parameter using C#

I have a few techniques all with similar parameter types and return values however various names and blocks. I need to pass the name of the technique to run to another strategy that will invoke the passed strategy.

public int Method1(string)

{

    // Do something

    return myInt;

}



public int Method2(string)

{

    // Do something different

    return myInt;

}



public bool RunTheMethod([Method Name passed in here] myMethodName)

{

    // Do stuff

    int i = myMethodName("My String");

    // Do more stuff

    return true;

}



public bool Test()

{

    return RunTheMethod(Method1);

}

This code doesn't work yet this is the thing that I am attempting to do. What I don't understand is the means by which to compose the RunTheMethod code since I need to characterize the parameter.

methods dotnet c#

3 years ago by vishaljlf39

3 Answers

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**akshay1995** · Answer 1 · 2021-05-25T12:33:00

You can use the Func delegate in .net 3.5 as the parameter in your RunTheMethod method. The Func delegate allows you to specify a method that takes a number of parameters of a specific type and returns a single argument of a specific type. Here is an example that should work:



public class Class1

{

    public int Method1(string input)

    {

        //... do something

        return 0;

    }



    public int Method2(string input)

    {

        //... do something different

        return 1;

    }



    public bool RunTheMethod(Func<string, int> myMethodName)

    {

        //... do stuff

        int i = myMethodName("My String");

        //... do more stuff

        return true;

    }



    public bool Test()

    {

        return RunTheMethod(Method1);

    }

}

**RoliMishra** · Answer 2 · 2021-05-26T14:19:20

The solution involves Delegates, which are used to store methods to call. Define a method taking a delegate as an argument,

public static T Runner<T>(Func<T> funcToRun)

{

    // Do stuff before running function as normal

    return funcToRun();

}

Then pass the delegate on the call site:

var returnValue = Runner(() => GetUser(99));

**sandhya6gczb** · Answer 3 · 2021-06-04T13:32:04

From OP's example:



 public static int Method1(string mystring)

 {

      return 1;

 }



 public static int Method2(string mystring)

 {

     return 2;

 }

You can try Action Delegate! And then call your method using



 public bool RunTheMethod(Action myMethodName)

 {

      myMethodName();   // note: the return value got discarded

      return true;

 }



RunTheMethod(() => Method1("MyString1"));

Or



public static object InvokeMethod(Delegate method, params object[] args)

{

     return method.DynamicInvoke(args);

}

Then simply call method



Console.WriteLine(InvokeMethod(new Func<string,int>(Method1), "MyString1"));



Console.WriteLine(InvokeMethod(new Func<string, int>(Method2), "MyString2"));

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Pass Method as Parameter using C#

3 Answers

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