EN CSharp Directive Pragma

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Management of diagnostics

Handbook C# · Practical Guide

warning disable/restore changes the selected warnings. checksum specifies the checksum for the debug information of the generated source.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
#pragma warning disable CS0168
int unused;
#pragma warning restore CS0168
System.Console.WriteLine("Ready");

Result:

Ready

Syntax

#pragma warning disable CODE / restore CODE

Example 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        #pragma warning disable CS0168
        int unused;
        #pragma warning restore CS0168
        Console.WriteLine("Ready");
    }
}

Example 2

#pragma checksum "Generated.cs" "{8829d00f-11b8-4213-878b-770e8597ac16}" "00112233445566778899AABBCCDDEEFF"
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Console.WriteLine("Source mapped");
    }
}

Official source: Microsoft Learn.