String.Substring Method (Int32) (System)

Substring Method (Int32)

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

String..::.Substring Method (Int32)

Updated: October 2008

Retrieves a substring from this instance. The substring starts at a specified character position.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

Visual Basic (Declaration)

Public Function Substring ( _
    startIndex As Integer _
) As String

Visual Basic (Usage)

Dim instance As String
Dim startIndex As Integer
Dim returnValue As String

returnValue = instance.Substring(startIndex)

public string Substring(
    int startIndex
)

Visual C++

public:
String^ Substring(
    int startIndex
)

JScript

public function Substring(
    startIndex : int
) : String

Parameters

startIndex: Type: System..::.Int32
The zero-based starting character position of a substring in this instance.

Return Value

Type: System..::.String
A String object equivalent to the substring that begins at startIndex in this instance, or Empty if startIndex is equal to the length of this instance.

Exceptions

Exception	Condition
ArgumentOutOfRangeException	startIndex is less than zero or greater than the length of this instance.

Remarks

The index is zero-based.

Note:
This method does not modify the value of the current instance. Instead, it returns a new string that begins at the startIndex position in the current string.

Examples

The following example demonstrates obtaining a substring from a string.

Visual Basic

Public Class SubStringTest

    Public Shared Sub Main()
        Dim info As String() = {"Name: Felica Walker", "Title: Mz.", "Age: 47", "Location: Paris", "Gender: F"}
        Dim found As Integer = 0

        Console.WriteLine("The initial values in the array are:")
        Dim s As String
        For Each s In  info
            Console.WriteLine(s)

        Next s
        Console.WriteLine("{0}We want to retrieve only the key information. That is:", Environment.NewLine)

        For Each s In  info
            found = s.IndexOf(":")
            Console.WriteLine(s.Substring((found + 1)).Trim())
        Next s
    End Sub 'Main
End Class 'SubStringTest
' The example displays the following output to the console:
'       The initial values in the array are:
'       Name: Felica Walker
'       Title: Mz.
'       Age: 47
'       Location: Paris
'       Gender: F
'       
'       We want to retrieve only the key information. That is:
'       Felica Walker
'       Mz.
'       47
'       Paris
'       F

using System;

public class SubStringTest {
    public static void Main() {

        string [] info = {"Name: Felica Walker", "Title: Mz.", "Age: 47", "Location: Paris", "Gender: F"};
        int found = 0;

        Console.WriteLine("The initial values in the array are:");
        foreach (string s in info)
            Console.WriteLine(s);

        Console.WriteLine("{0}We want to retrieve only the key information. That is:", Environment.NewLine);        

        foreach (string s in info) {
            found = s.IndexOf(":");
            Console.WriteLine(s.Substring(found + 1).Trim());
        }
    }
}
// The example displays the following output to the console:
//       The initial values in the array are:
//       Name: Felica Walker
//       Title: Mz.
//       Age: 47
//       Location: Paris
//       Gender: F
//       
//       We want to retrieve only the key information. That is:
//       Felica Walker
//       Mz.
//       47
//       Paris
//       F

Visual C++

using namespace System;
using namespace System::Collections;
int main()
{
   array<String^>^info = {"Name: Felica Walker","Title: Mz.","Age: 47","Location: Paris","Gender: F"};
   int found = 0;
   Console::WriteLine( "The initial values in the array are:" );
   IEnumerator^ myEnum1 = info->GetEnumerator();
   while ( myEnum1->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum1->Current);
      Console::WriteLine( s );
   }

   Console::WriteLine( "\nWe want to retrieve only the key information. That is:" );
   IEnumerator^ myEnum2 = info->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum2->Current);
      found = s->IndexOf( ":" );
      Console::WriteLine( s->Substring( found + 1 )->Trim() );
   }
}
// The example displays the following output to the console:
//       The initial values in the array are:
//       Name: Felica Walker
//       Title: Mz.
//       Age: 47
//       Location: Paris
//       Gender: F
//       
//       We want to retrieve only the key information. That is:
//       Felica Walker
//       Mz.
//       47
//       Paris
//       F

JScript

import System;

public class SubStringTest {
    public static function Main() : void {

        var info : String [] = ["Name: Felica Walker", "Title: Mz.", "Age: 47", "Location: Paris", "Gender: F"];
        var found : int = 0;

        Console.WriteLine("The initial values in the array are:");
        for (var i : int in info)
            Console.WriteLine(info[i]);

        Console.WriteLine("{0}We want to retrieve only the key information. That is:", Environment.NewLine);        

        for (i in info) {
            found = info[i].IndexOf(":");
            Console.WriteLine(info[i].Substring(found + 1).Trim());
        }
    }
}
SubStringTest.Main();
// The example displays the following output to the console:
//       The initial values in the array are:
//       Name: Felica Walker
//       Title: Mz.
//       Age: 47
//       Location: Paris
//       Gender: F
//       
//       We want to retrieve only the key information. That is:
//       Felica Walker
//       Mz.
//       47
//       Paris
//       F

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information