Tutorials 参考 练习 Menu
Paid Courses

C# Comments


Comments can be used to explain C# code, and to make it more readable. It can also be used to prevent execution when testing alternative code.

Single-line comments start with two forward slashes (//).

Any text between // and the end of the line is ignored by C# (will not be executed).

This example uses a single-line comment before a line of code:


// This is a comment
Console.WriteLine("Hello World!");

来试试吧 »

This example uses a single-line comment at the end of a line of code:


Console.WriteLine("Hello World!");  // This is a comment

来试试吧 »

C# Multi-line Comments

Multi-line comments start with /* and ends with */.

Any text between /* and */ will be ignored by C#.

This example uses a multi-line comment (a comment block) to explain the code:


/* The code below will print the words Hello World
to the screen, and it is amazing */
Console.WriteLine("Hello World!"); 

来试试吧 »

Single or multi-line comments?

It is up to you which you want to use. Normally, we use // for short comments, and /* */ for longer.

C# 练习

Test Yourself With 练习


Insert the missing parts to create two types of comments.

 This is a single-line comment
 This is a multi-line comment 

Start the Exercise

W3Schools is optimized for learning and training. 示例 might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2021 by Refsnes Data. All Rights Reserved.
W3Schools is Powered by W3.CSS.