{"id":126,"date":"2021-12-22T23:10:34","date_gmt":"2021-12-22T16:10:34","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=126"},"modified":"2023-07-08T09:15:54","modified_gmt":"2023-07-08T02:15:54","slug":"csharp-string","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-tutorial\/csharp-string\/","title":{"rendered":"C# string"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn about the C# string type and the basic string operations.<\/p>\n\n\n\n

Introduction to the C# string<\/h2>\n\n\n\n

C# uses the string<\/code> keyword to represent the string type. The string<\/code> keyword is an alias for the System.String<\/code> type. Therefore, the string<\/code> and String<\/code> are equivalent.<\/p>\n\n\n\n

Declare a string<\/h3>\n\n\n\n

The following example declares a string variable<\/a> without initializing it:<\/p>\n\n\n

string<\/span> message;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
After declaring the string variable, you can assign it a string literal. To form a string literal, you place the string text inside double quotes (\"...\"<\/code>). For example:<\/p>\n\n\n
message = \"Hi\"<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The following example declares and initializes the string using one statement:<\/p>\n\n\n
string<\/span> message = \"Hi\"<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
To create a zero-length string, you use the String.Empty<\/code> like this:<\/p>\n\n\n
string<\/span> message = String.Empty;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
It’s equivalent to the following:<\/p>\n\n\n
string<\/span> message  = \"\"<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Get the length of a string<\/h3>\n\n\n\n
A string has the Length<\/code> property that returns the length of a string. To access the Length<\/code> property, you use the dot operator (.<\/code>) like this:<\/p>\n\n\n
string<\/span> message = \"Hello\"<\/span>;\n\nConsole.WriteLine(message.Length);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
5<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Concatenate two strings<\/h3>\n\n\n\n
To concatenate two strings into one, you use the +<\/code> operator. For example:<\/p>\n\n\n
string<\/span> message = \"Good\"<\/span> + \" Morning\"<\/span>;\n\nConsole.WriteLine(message);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
Good Morning!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
To append a string to another, you can also use the +=<\/code> operator. For example:<\/p>\n\n\n
string<\/span> message = \"Good\"<\/span>;\nmessage += \" Morning!\"<\/span>;\n\nConsole.WriteLine(message);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
Good Morning!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The String provides you with Join()<\/a><\/code> method that allows you to concatenate two or more strings into a single string using a separator.<\/p>\n\n\n\n
Besides the +<\/code> operator, you can use the Concat()<\/a> method to concatenate two or more strings into a string.<\/p>\n\n\n\n
C# string is immutable<\/h2>\n\n\n\n
C# string is immutable. It means that when you make any changes to a string, you’ll always get a new string. For example:<\/p>\n\n\n
string<\/span> message = \"C#\"<\/span>;\nmessage += \" string\"<\/span>;\n\nConsole.WriteLine(message);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
C# string<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this example:<\/p>\n\n\n\n