How can i call a Func arguments in a method in C#?

Question

I am trying to create a method which accepts different methods(Funcs) as a parameter.
I have a small problem in defining the Funcs arguments. Suppose i need to call some thing like this :

public static void SomeTestMethod(int number,string str)
{
    Check(MethodOne(number,str));
}

And For Check i have this:

public static int Check(Func<int,string,int> method)
{
         // some conditions 
      method(where should i get the arguments ?);
}

Now my question is how should i set the needed arguments? I feel providing separate arguments for Check, is not elegant, since i need to call Check with the signature i provided in the TestMethod.
I dont want to have

Check(MethodOne,arg1,arg2,etc));

If it is possible i need to provide this signature instead:

Check(MethodOne(number,str));

It's *very* unclear what you're asking. If that even compiles, then `MethodOne` returns a `Func`. It would really help if you'd provide a short but complete program demonstrating the problem - and explain what you're trying to achieve. — Jon Skeet, Oct 21 '14 at 06:36
Just note that `Func` takes just one parameter (an int) and returns a `string`. You invoke it like so `var result = method(someInt);` - presumably `Check` should then reason over `result`, or return it? — StuartLC, Oct 21 '14 at 06:37

score 2 · Accepted Answer · answered Oct 21 '14 at 06:53

2

I think you want this:

public static void SomeTestMethod(int number,string str)
{
    Check( () => MethodOne(number,str));
}

public static int Check(Func<int> method)
{
         // some conditions 
      return method();
}

answered Oct 21 '14 at 06:53

Henrik

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Thanks, I completely forgot about lambdas :) , thanks – Hossein Oct 21 '14 at 07:17

score 1 · Answer 2 · answered Oct 21 '14 at 06:38

public static void Check<TReturnValue>(
                       Func<int, string, TReturnValue> method, 
                       int arg1, 
                       string arg2)
{
    method(arg1, arg2);
}

calling:

public static SomeClass MethodOne(int p1, string p2)
{
   // some body
}

Check(MethodOne, 20, "MyStr");

You have missed the type of return value (the last generic parameter means the type of return value). If you don't want to Func return anything, just use Action:

public static void Check(
                       Action<int, string> method, 
                       int arg1, 
                       string arg2)
{
    method(arg1, arg2);
}

How can i call a Func arguments in a method in C#?

2 Answers2