{"id":2605,"date":"2023-07-08T09:35:24","date_gmt":"2023-07-08T02:35:24","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=2605"},"modified":"2023-07-08T09:37:34","modified_gmt":"2023-07-08T02:37:34","slug":"csharp-string-insert","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-insert\/","title":{"rendered":"C# String Insert"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to use the C# string Insert()<\/code> method to insert a string at a specified index position of a string.<\/p>\n\n\n\n

Introduction to the C# String Insert() method<\/h2>\n\n\n\n

The C# string<\/a> Insert()<\/code> method allows you to insert a string at a specified index position of a string and return a new string.<\/p>\n\n\n\n

Here’s the syntax of the Insert()<\/code> method:<\/p>\n\n\n

public<\/span> string<\/span> Insert<\/span> (\n    int<\/span> startIndex, \n    string<\/span> value<\/span>\n<\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this syntax:<\/p>\n\n\n\n
    \n
  • startIndex<\/code> is the zero-based index position of the insertion.<\/li>\n\n\n\n
  • value<\/code> is the string to insert.<\/li>\n<\/ul>\n\n\n\n
    The Insert()<\/code> method doesn’t modify the current string<\/strong> but returns a new string with the value<\/code> inserted at the startIndex<\/code> of the current string.<\/p>\n\n\n\n
    If the startIndex<\/code> is equal to the length of the string, the Insert()<\/code> method appends the string value<\/code> to the end of the string. <\/p>\n\n\n\n
    If the startIndex<\/code> is zero, the Insert()<\/code> method prepends the string value<\/code> to the current string.<\/p>\n\n\n\n
    C# String Insert() method examples<\/h2>\n\n\n\n
    Let’s take some examples of using the Insert()<\/code> method.<\/p>\n\n\n\n
    1) Using the string Insert() method to insert a space between two words in a string<\/h3>\n\n\n\n
    The following example illustrates how to use the Insert()<\/code> method to insert a space between the word Hello<\/code> and World<\/code>:<\/p>\n\n\n
    var<\/span> message = \"HelloWorld!\"<\/span>;\n\nvar<\/span> startIndex = message.IndexOf(\"W\"<\/span>);\nvar<\/span> result = message.Insert(startIndex, \" \"<\/span>);\n\nConsole.WriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Output:<\/p>\n\n\n
    Hello World!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    How it works.<\/p>\n\n\n\n
    First, find the index of the \"W\"<\/code> in the message string by using the IndexOf()<\/code> method:<\/p>\n\n\n
    var<\/span> startIndex = message.IndexOf(\"W\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Second, insert the space at the found index into the string using the Insert()<\/code> method and assign the resulting string to the result<\/code> variable:<\/p>\n\n\n
    var<\/span> result = message.Insert(startIndex, \" \"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Third, display the result string in the console:<\/p>\n\n\n
    Hello World!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    2) Using the string Insert() method to append a string to the current string<\/h3>\n\n\n\n
    The following example illustrates how to use the Insert()<\/code> method to append the string \"!\"<\/code> to a string:<\/p>\n\n\n
    var<\/span> message = \"Hello World\"<\/span>;\n\nvar<\/span> result = message.Insert(message.Length, \"!\"<\/span>);\n\nConsole.WriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Output:<\/p>\n\n\n
    Hello World!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    3) Using the string Insert() method to prepend a string<\/h3>\n\n\n\n
    The following example shows how to use the Insert()<\/code> method to prepend a string to the current string:<\/p>\n\n\n
    var<\/span> message = \"Hello World!\"<\/span>;\n\nvar<\/span> result = message.Insert(0<\/span>, \"*\"<\/span>);\n\nConsole.WriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Output:<\/p>\n\n\n
    *Hello World!<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Summary<\/h2>\n\n\n\n
      \n
    • Use the C# string Insert()<\/code> method to insert a string into another string at a specified index.<\/li>\n<\/ul>\n
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