Pass Function with different signitures to another function c#

Question

Hello I'd like to create a generic function that accepts a Function T and invokes it.

for example : The magic Function should be like this

 public void Test() 
 {
    InvokeFunction(Test1, "st", "sn");
    InvokeFunction(Test2, 7);
 }

public void InvokeFunction(Function f)
{ 
  f();
}

 public void Test1(string sT, string sFN)
 {
   Console.WriteLine(sT + " : " + sFN);
 }

 public string Test2(int p)
 {
    return p + "";
 }

Is there a way to do it? If so how?

Thanks!

Check http://stackoverflow.com/questions/9410/how-do-you-pass-a-function-as-a-parameter-in-c — Dart Feld, Oct 27 '16 at 18:47

score 1 · Answer 1 · answered Oct 27 '16 at 18:46

1

You could do that as an Action but you have to pass a lambda that calls the method with the desired arguments.

public void Test() 
{
   InvokeFunction(() => Test1("st", "sn"));
}

public void InvokeFunction(Action f)
{ 
    f();
}

public void Test1(string sT, string sFN)
{
    Console.WriteLine(sT + " : " + sFN);
}

However if your method has a return value that you want you'd need a separate generic method using a Func for that.

public void Test() 
{
    var result = InvokeFunction(() => Test2(7));
    Console.WriteLine(result);
}

public T InvokeFunction<T>(Func<T> f)
{ 
    return f();
}

public string Test2(int p)
{
    return p + "";
}

answered Oct 27 '16 at 18:46

juharr

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Thank You! If I have both void and returns a value? It is still posible? if i have a write and read action where write is void and read returns a value – dan Oct 27 '16 at 18:50
@dan Sure, but you'd need to have both overloads, or better yet give them separate names, maybe `InvokeFunction` and `InvokeAction`. – juharr Oct 27 '16 at 18:51
Thats Great Thanks! – dan Oct 27 '16 at 18:53

score 0 · Answer 2 · answered Oct 27 '16 at 18:51

Your method can has a return value or void. So, you must have two generic function.

TValue InvokeFunction<TValue>(Func<TValue> func)
{
    return func();
}

void InvokeFunction(Action func)
{
    func();
}

Usage,

var result = InvokeFunction(() => Test2(3));
InvokeFunction(() => Test1("p1", "p2"));

Pass Function with different signitures to another function c#

2 Answers2