The role of @ in c#

The functions of the @ symbol in C# include: string literal indicator (allowing the use of unescaped backslashes), string interpolation (preventing special characters in expressions from being parsed), native strings (in converted to text at compile time) and to avoid keyword conflicts (by being prefixed).

The role of @ in C

#In C#, the symbol @ has the following functions:

1. String literal indicator The

@ symbol is used as a string literal indicator, allowing you to use backslashes to escape characters without escaping the symbol itself. For example:

<code>string path = @"C:\Users\username\Documents";</code>

With the @ symbol, you don't have to escape the \ characters, so it's easier to write paths or other strings containing special characters.

2. String interpolation

C# 6.0 introduces string interpolation, which uses $ characters and curly braces to convert expressions embedded in the string. The @ symbol can be used with string interpolation to prevent special characters in expressions from being parsed as escape sequences. For example:

<code>string name = "John";
Console.WriteLine($@"Hello, {name}!");</code>

3. Raw Strings

In C# 10.0, raw strings were introduced, which allow you to create strings that are converted to text at compile time . The @ symbol is used as a native string indicator. For example:

<code>string rawString = @"This is a raw string.
It includes newlines and other special characters without escaping.";</code>

4. Avoid keyword conflicts

If you want to write an identifier with the same name as a C# keyword, you can use the @ symbol as a prefix to avoid Compile Error. For example:

<code>int @class = 10; // class 是 C# 关键字</code>

It should be noted that using the @ symbol as a prefix will cause the identifier to lose the meaning of the contextual keyword.

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