Книга: C# 2008 Programmer

#pragma warning

#pragma warning

The #pragma warning directive enables or disables compiler warning messages. For example, consider the following program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace TestDefine {
 class Program {
  int num = 5;
  static void Main(string[] args) {}
 }
}

In this program, the variable num is defined but never used. When you compile the application, the C# compiler will show a warning message (see Figure 3-20).


Figure 3-20 

To suppress the warning message, you can use the #pragma warning directive together with the warning number of the message that you want to suppress:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
#pragma warning disable 414
namespace TestDefine {
 class Program {
  int num = 5;
  static void Main(string[] args) {}
 }
}

This example suppresses warning message number 414 ("The private field 'field' is assigned but its value is never used"). With the #pragma warning directive, the compiler will now suppress the warning message (see Figure 3-21).


Figure 3-21 

You can suppress multiple warning messages by separating the message numbers with a comma (,) like this:

#pragma warning disable 414, 3021, 1959

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