{"id":2506,"date":"2023-07-01T15:03:07","date_gmt":"2023-07-01T08:03:07","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=2506"},"modified":"2023-07-01T15:15:31","modified_gmt":"2023-07-01T08:15:31","slug":"csharp-string-startswith","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-startswith\/","title":{"rendered":"C# String StartsWith"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to use the C# String StartsWith<\/code> to determine if the beginning of a string matches a specified string.<\/p>\n\n\n\n

Introduction to the C# String StartsWith method<\/h2>\n\n\n\n

The String<\/a> StartsWith()<\/code> method allows you to check if the beginning of a string matches the specified string<\/a>, taking into account the culture during comparison.<\/p>\n\n\n\n

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

public<\/span> bool<\/span> StartsWith<\/span> (string<\/span> value<\/span><\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The StartsWith<\/code> method accepts a parameter value<\/code> that represents the string to match. It returns true<\/code> if the string value <\/code>matches the beginning of the current string or false<\/code> otherwise.<\/p>\n\n\n\n
For example, the following program uses the StartsWith()<\/code> method to check if the beginning of the string \"To live or not to live\"<\/code> starts with the substring \"To live\"<\/code>:<\/p>\n\n\n
using<\/span> static<\/span> System.Console;\n\nvar<\/span> message = \"To live or not to live\"<\/span>;\nvar<\/span> result = message.StartsWith(\"To live\"<\/span>);\nWriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
True<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The StartsWith() method returns true<\/code> as expected.<\/p>\n\n\n\n
The following example uses the StartsWith()<\/code> method to check if the string \"To live or not to live\"<\/code> starts with the string \"To Live\"<\/code> with the letters T<\/code> and L<\/code> in uppercase:<\/p>\n\n\n
using<\/span> static<\/span> System.Console;\n\nvar<\/span> message = \"To live or not to live\"<\/span>;\nvar<\/span> result = message.StartsWith(\"To Live\"<\/span>);\nWriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
False<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this example, the StartsWith()<\/code> method returns false<\/code> because it compares strings case-sensitively. To specify the string comparison’s rules, you can use the following overload of the StartsWith()<\/code> method:<\/p>\n\n\n
public<\/span> bool<\/span> StartsWith<\/span> (\n   string<\/span> value<\/span>, \n   StringComparison comparisonType\n<\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this overload, you can specify the comparisonType<\/code> with one of the StringComparison<\/code> enum value that determines how the StartsWith<\/code> compare the strings.<\/p>\n\n\n\n
For example, the following program illustrates how to use the StartsWith<\/code> method to match the string case-insensitively using the StringComparison.OrdinalIgnoreCase<\/code> option:<\/p>\n\n\n
using<\/span> static<\/span> System.Console;\n\nvar<\/span> message = \"To live or not to live\"<\/span>;\n\nvar<\/span> result = message.StartsWith(\n    \"To Live\"<\/span>, \n    StringComparison.OrdinalIgnoreCase\n);\n\nWriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
True<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The StartsWith()<\/code> method has another overload that accepts three parameters:<\/p>\n\n\n
public<\/span> bool<\/span> StartsWith<\/span> (\n   string<\/span> value<\/span>, \n   bool<\/span> ignoreCase, \n   System.Globalization.CultureInfo? culture\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
  • ignoreCase<\/code> is set to true<\/code> to ignore the case during the comparison; otherwise false<\/code>.<\/li>\n\n\n\n
  • culture<\/code> represents the cultural information used to compare the strings. If the culture<\/code> is null<\/code>, the method uses the current culture.<\/li>\n<\/ul>\n\n\n\n
    Summary<\/h2>\n\n\n\n
      \n
    • Use the C# String StartsWith()<\/code> method to determine whether the beginning of a string matches a specified string.<\/li>\n<\/ul>\n
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