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CaseInsensitiveComparer.Compare Method

Performs a case-insensitive comparison of two objects of the same type and returns a value indicating whether one is less than, equal to, or greater than the other.

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

public int Compare (
	Object a,
	Object b
)
public final int Compare (
	Object a, 
	Object b
)
public final function Compare (
	a : Object, 
	b : Object
) : int
Not applicable.

Parameters

a

The first object to compare.

b

The second object to compare.

Return Value

Value

Condition

Less than zero

a is less than b, with casing ignored.

Zero

a equals b, with casing ignored.

Greater than zero

a is greater than b, with casing ignored.

Exception typeCondition

ArgumentException

Neither a nor b implements the IComparable interface.

-or-

a and b are of different types.

If a and b are both strings, this method uses CompareInfo.Compare to compare the strings with the casing ignored; otherwise, it uses the IComparable implementation of either object. That is, if a implements IComparable, then this method returns the result of a. CompareTo (b); otherwise, if b implements IComparable, then it returns the negated result of b. CompareTo (a).

Comparing a null reference (Nothing in Visual Basic) with any type is allowed and does not generate an exception when using IComparable. When sorting, a null reference (Nothing in Visual Basic) is considered to be less than any other object.

String comparisons might have different results depending on the culture. For more information on culture-specific comparisons, see the System.Globalization namespace and Encoding and Localization.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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