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Strings.StrComp Method

Returns -1, 0, or 1, based on the result of a string comparison.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static int StrComp(
	string String1,
	string String2,
	CompareMethod Compare
)

Parameters

String1
Type: System.String

Required. Any valid String expression.

String2
Type: System.String

Required. Any valid String expression.

Compare
Type: Microsoft.VisualBasic.CompareMethod

Optional. Specifies the type of string comparison. If Compare is omitted, the Option Compare setting determines the type of comparison.

Return Value

Type: System.Int32
If String1 sorts ahead of String2, StrComp returns -1. If String1 is equal to String2, StrComp returns 0. If String1 sorts after String2, StrComp returns 1.

For more detailed information, see the Visual Basic topic StrComp Function (Visual Basic).

The strings are compared by alphanumeric sort values beginning with the first character. For further information on binary comparisons, textual comparisons, and sort order, see Option Compare Statement.

The Compare argument settings are:

Constant

Description

Binary

Performs a binary comparison, based on a sort order derived from the internal binary representations of the characters.

Text

Performs a text comparison, based on a case-insensitive text sort order determined by your system's LocaleID value.

This example uses the StrComp function to return the results of a string comparison. If the third argument is omitted, the comparison type defined in the Option Compare statement or project defaults is performed.

' Defines variables. 
Dim TestStr1 As String = "ABCD" 
Dim TestStr2 As String = "abcd" 
Dim TestComp As Integer 
' The two strings sort equally. Returns 0.
TestComp = StrComp(TestStr1, TestStr2, CompareMethod.Text)
' TestStr1 sorts after TestStr2. Returns -1.
TestComp = StrComp(TestStr1, TestStr2, CompareMethod.Binary)
' TestStr2 sorts before TestStr1. Returns 1.
TestComp = StrComp(TestStr2, TestStr1)

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

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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