Question

How to create custom exception in C#

Answer 1

using System;
 
class NegativeError: Exception {
    public NegativeError(string message): base(message) {}
}

class Program
{
    static void CheckNegative(int n)
    {
      if (n < 0) {
         throw new NegativeError("Negative not allowed");
      }
    }

    static void Main(string[] args)
    {
      try {
        CheckNegative(-7);
      }
      catch(NegativeError ex) {
        Console.WriteLine(ex);
      }
    }
}



 
/*
run:
 
NegativeError: Negative not allowed
  at Program.CheckNegative (System.Int32 n) [0x00011] in <83cce1a405bb4cfdbe7efa2843fa4ef6>:0 
  at Program.Main (System.String[] args) [0x00000] in <83cce1a405bb4cfdbe7efa2843fa4ef6>:0 
 
*/

 

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