What's the use/meaning of the @ character in variable names in C#?

What's the use/meaning of the @ character in variable names in C#?

In C#, the @ character can be used as a prefix to create verbatim string literals and to escape reserved keywords.

1. Verbatim string literals: If you need to include special characters or escape sequences in a string literal, you can use a verbatim string literal by prefixing the string with the @ character. This tells the compiler to treat the string literally, without interpreting any escape sequences. For example:

 string path = @"C:\Users\John\Documents";

In this example, the backslashes in the string are interpreted literally, rather than as escape characters.

Escaping reserved keywords: If you want to use a reserved keyword as a variable name, you can prefix the variable name with the @ character to escape the keyword. For example:

 string @class = "MyClass";

In this example, the variable name is @class, which is a reserved keyword in C#. By prefixing the variable name with @, we're telling the compiler to treat class as an identifier rather than a keyword.

It's worth noting that while you can use the @ character to escape reserved keywords, it's generally not recommended. It's better to choose a different variable name that doesn't conflict with a reserved keyword.

Examples

  1. "C# @ symbol in variable names" Description: Understand the significance of the "@" symbol in variable names and its usage in C#.

    using System; class Program { static void Main(string[] args) { int @int = 5; // Using "@" symbol in variable name Console.WriteLine($"Value of @int: {@int}"); } }

  2. "C# variable names starting with @" Description: Learn how the "@" symbol can be used to start a variable name in C#.

    using System; class Program { static void Main(string[] args) { string @string = "Hello, world!"; // Variable name starting with "@" Console.WriteLine(@string); } }

  3. "C# special characters in variable names" Description: Explore how special characters like "@" can be included in C# variable names.

    using System; class Program { static void Main(string[] args) { string special@variable = "Special variable name with @ symbol"; Console.WriteLine(special@variable); } }

  4. "C# using @ in identifiers" Description: Discover how the "@" symbol can be used within identifiers, including variable names, in C#.

    using System; class Program { static void Main(string[] args) { string identifier_with_@ = "Using @ symbol in an identifier"; Console.WriteLine(identifier_with_@); } }

  5. "C# @ in identifier names" Description: Learn about the role of "@" in forming valid identifier names in C#.

    using System; class Program { static void Main(string[] args) { string validIdentifierName = "Using @ in identifier names"; Console.WriteLine(validIdentifierName); } }

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