{"id":2555,"date":"2023-07-03T10:54:07","date_gmt":"2023-07-03T03:54:07","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=2555"},"modified":"2023-07-03T10:57:17","modified_gmt":"2023-07-03T03:57:17","slug":"csharp-string-substring","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-substring\/","title":{"rendered":"C# String Substring"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to use the C# String Substring()<\/code> method to extract a portion of a string.<\/p>\n\n\n\n

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

The String<\/a> Substring()<\/code> method allows you to extract a portion of a string. It returns a new string that contains a specified number of characters from the original string, starting at a specified index.<\/p>\n\n\n\n

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

public<\/span> string<\/span> Substring<\/span>(\n   int<\/span> startIndex\n<\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this syntax, the startIndex<\/code> specifies the zero-based starting character position of a substring in the string. The method returns a substring that starts at the startIndex<\/code> and continues to the end of the string.<\/p>\n\n\n\n
The following example uses the Substring()<\/code> method to extract the AM<\/code>\/PM<\/code> from a time string:<\/p>\n\n\n
using<\/span> static<\/span> System.Console;\n\nvar<\/span> time = \"12:30 PM\"<\/span>;\n\nvar<\/span> startIndex = time.IndexOf(' '<\/span>);\nvar<\/span> result = time.Substring(startIndex + 1<\/span>);\n\nWriteLine(result);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
PM<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
Second, extract a substring that starts from the index + 1<\/code> to the end of the string using the Substring()<\/code> method.<\/p>\n\n\n\n
The Substring()<\/code> method has an overload that allows you to specify the length of the substring to return:<\/p>\n\n\n
public<\/span> string<\/span> Substring<\/span> (\n   int<\/span> startIndex, \n   int<\/span> length\n<\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this syntax, the length specifies the number of characters included in the substring.<\/p>\n\n\n\n
For example, the following program uses the Substring()<\/code> method to extract the minute part of a time string:<\/p>\n\n\n
using<\/span> static<\/span> System.Console;\n\nvar<\/span> time = \"12:30 PM\"<\/span>;\nvar<\/span> startIndex = time.IndexOf(':'<\/span>);\nvar<\/span> result = time.Substring(startIndex + 1<\/span>, 2<\/span>);\n\nWriteLine(result); \/\/ 30<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
30<\/span><\/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 position of the character in the time string using IndexOf()<\/code> method:<\/p>\n\n\n
var<\/span> startIndex = time.IndexOf(':'<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Second, extract the minutes starting from the position after the character :<\/code> and limit the number of characters in the substring to 2:<\/p>\n\n\n
var<\/span> result = time.Substring(startIndex + 1<\/span>, 2<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary<\/h2>\n\n\n\n
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  • Use the C# String Substring()<\/code> method to return a new string that contains a specified number of characters from the original string, starting at a specified index.<\/li>\n<\/ul>\n
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First, find the index of the space in the time string using the IndexOf()<\/a><\/code> method.<\/p>\n\n\n\n