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String.CompareOrdinal Method (String, String)

Compares two specified String objects by evaluating the numeric values of the corresponding Char objects in each string.

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

public static int CompareOrdinal(
	string strA,
	string strB
)

Parameters

strA
Type: System.String
The first string to compare.
strB
Type: System.String
The second string to compare.

Return Value

Type: System.Int32
An integer that indicates the lexical relationship between the two comparands.

Value

Condition

Less than zero

strA is less than strB.

Zero

strA and strB are equal.

Greater than zero

strA is greater than strB.

This method performs a case-sensitive comparison using ordinal sort rules. For more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions. To perform a case-insensitive comparison using ordinal sort rules, call the Compare method with a StringComparison value of OrdinalIgnoreCase.

Because CompareOrdinal is a static method, strA and strB can be null. If both values are null, the method returns 0 (zero), which indicates that strA and strB are equal. If only one of the values is null, the method considers the non-null value to be greater.

The following example performs and ordinal comparison of two strings that only differ in case.


// Sample for String.CompareOrdinal(String, String)
using System;

class Sample {
    public static void Main() {
    String str1 = "ABCD";
    String str2 = "abcd";
    String str;
    int result;

    Console.WriteLine();
    Console.WriteLine("Compare the numeric values of the corresponding Char objects in each string.");
    Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
    result = String.CompareOrdinal(str1, str2);
    str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
    Console.Write("String '{0}' is ", str1);
    Console.Write("{0} ", str);
    Console.WriteLine("String '{0}'.", str2);
    }
}
/*
This example produces the following results:

Compare the numeric values of the corresponding Char objects in each string.
str1 = 'ABCD', str2 = 'abcd'
String 'ABCD' is less than String 'abcd'.
*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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