Example of the code

class Main{
        Name Jack = new Name();
        Jack.Speak();
}

class Name{
     public string speak(){
        Console.WriteLine("Hello", valuename);
      }
      
     public Name()
     {
       valuename = nameof(Jack); 
     }
}

Output the what im searching for:

Hello Jack. 

If user types Name Joe = new Name(); output will be Hello Joe.

CodePudding user response：

Local variable names are syntactical sugar that is mostly thrown away by the compiler, so there's no direct way to do this.

The closest you can get is using [CallerArgumentExpression] to have the compiler capture the source code expression that was passed to a parameter, but this only works for method arguments and will capture the entire expression, not just the variable name. For example, the following program will print jack then jack "hello":

using System;
using System.Runtime.CompilerServices;

class Program {
    static void Main()
    {
        var jack = "dummy";
        WriteExpression(jack);
        WriteExpression(jack   "hello");
    }

    static void WriteExpression(
        string param, 
        [CallerArgumentExpression("param")] string paramExpression = null
    ) => Console.WriteLine(paramExpression);
}