The catch Clause - CSharp Custom Type

CSharp examples for Custom Type:try catch finally

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Introduction

A catch clause specifies what type of exception to catch.

This must either be System.Exception or a subclass of System.Exception.

Catching System.Exception catches all possible errors. 

class Test
{
  static void Main (string[] args)
  {
    try
    {
      byte b = byte.Parse (args[0]);
      Console.WriteLine (b);
    }
    catch (IndexOutOfRangeException ex)
    {
      Console.WriteLine ("Please provide at least one argument");
    }
    catch (FormatException ex)
    {
      Console.WriteLine ("That's not a number!");
    }
    catch (OverflowException ex)
    {
      Console.WriteLine ("You've given me more than a byte!");
    }
  }
}

Only one catch clause executes for a given exception.

If you want to include a safety net to catch more general exceptions, you must put the more specific handlers first .

An exception can be caught without specifying a variable if you don't need to access its properties: 

catch (OverflowException)   // no variable
{
  ...
}

Furthermore, you can omit both the variable and the type (meaning that all exceptions will be caught): 

catch { ... }

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