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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
)

Parameters

a
Type: System.Object

The first object to compare.

b
Type: System.Object

The second object to compare.

Return Value

Type: System.Int32
A signed integer that indicates the relative values of a and b, as shown in the following table.

Value

Meaning

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.

Implements

IComparer.Compare(Object, Object)

ExceptionCondition
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 null with any type is allowed and does not generate an exception when using IComparable. When sorting, null 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 Globalizing and Localizing .NET Framework Applications.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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