using a return view of two delegate function in another delegate function in same class in c#

Question

I define 3 delegate functions in a class like

public func<datetime,string>A=>str1 { }
public func<datetime,string>B=>str2 { }
public func<datetime,string>C=>str3
{
    return a+b; 
}

how can I call a,b in c function, because return in function c is wrong?

Your code makes no sense. Try providing a FULL and CLEAR explanation of the problem. Describe EXACTLY what you expect to happen and EXACTLY what does happen. Not some vague description that requires us to work out the intention from code that doesn't achieve it. — jmcilhinney
– jmcilhinney, Commented May 4, 2017 at 5:15
@jmcilhinney myproblem is just I do not know how to call a delegate function. it does not need extra code, because in my description I use its functions name and its parameters type — bz.morvarid
– bz.morvarid, Commented May 4, 2017 at 5:28
@HosseinNarimaniRad no it does not compile when I call A and B function just by their names in C function as I write "return A+B" shows me a red line under that as you know means it is not correct — bz.morvarid
– bz.morvarid, Commented May 4, 2017 at 5:32
You could start by making it real code rather than pseudo-code - what is str1? What is str2? Are you intending A and B to be properties, or something else? Why have you not bothered with proper capitalization? What does this have to do with ASP.NET? (You're not using anything ASP.NET-specific in the code...) Please put more time into explaining your question clearly. — Jon Skeet
– Jon Skeet, Commented May 4, 2017 at 5:40

Gilad Green · Accepted Answer · 2017-05-04 05:34:34Z

1

See that your provided code does not compile in for many reasons. To call the A and B methods you must properly call it with passing the parameters such like:

public static Func<DateTime, string> A = (date) => { return date.ToString(); };
public static Func<DateTime, string> B = (date) => { return date.ToString(); };
public static Func<DateTime, string> C = (date) => { return A(date) + B(date); };

static void Main(string[] args)
{
    var date = DateTime.Now;
    Console.WriteLine(C(date));
}

See that I also added static because without that you get the error:

A field initializer cannot reference the non-static field, method, or property Program.A

answered May 4, 2017 at 5:34

Gilad Green

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3 Comments

Jon Skeet Over a year ago

Although I'd probably make them properties rather than public fields... (And then edit your answer to make it clear that they're fields, not methods...)

Gilad Green Over a year ago

@JonSkeet - can you please elaborate so I can correct my answer?

Jon Skeet Over a year ago

Elaborate on which part? You're currently defining fields - I'd suggest making them public read-only properties instead, e.g. public static Func<DateTime, string> A { get; } = date => date.ToString(); etc. Then refer to A and B as delegates rather than methods, because they're not methods.

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