What does @ character d mean in C#

C# string string can be preceded by @ (called "word-by-word string") to treat escaped characters (\) as normal characters, such as:

string str = @"C:\Windows";

Equivalent to:

string str = "C:\\Windows";

@ You can have any newline in a string, and the newline and indented spaces are calculated within the length of the string.

string str = @"<script type=""text/javascript"">
    <!--
    -->
</script>";

3 functions of @ in C#

1. Ignore escape characters

For example:

string fileName = "D:\\Text File\\";

After using @

string fileName = @"D:\Text File\";

2. Let the string cross line

For example:

    string strSQL = "SELECT * FROM  AS e"
   + " INNER JOIN  AS c"
   + " ON  = "
   + " ORDER BY ";

After using @

    string strSQL = @"SELECT * FROM  AS e
                INNER JOIN  AS c
                ON  = 
                ORDER BY ";

3. Usage in identifiers

C# does not allow keywords to be used as identifiers (class name, variable name, method name, tablespace name, etc.), but if @ is added, it will be fine.

For example:

    public static void @static(int @int)
 {
            if (@int > 0)
            {
                ("Positive Integer");
            }
            else if (@int == 0)
            {
                ("Zero");
            }
            else
            {
                ("Negative Integer");
            }
}

Summarize

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