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CaseInsensitiveComparer Class

Compares two objects for equivalence, ignoring the case of strings.

System.Object
  System.Collections.CaseInsensitiveComparer

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)
[<SerializableAttribute>]
[<ComVisibleAttribute(true)>]
type CaseInsensitiveComparer =  
    class 
        interface IComparer 
    end

The CaseInsensitiveComparer type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkCaseInsensitiveComparer()Initializes a new instance of the CaseInsensitiveComparer class using the Thread.CurrentCulture of the current thread.
Public methodSupported by the XNA FrameworkCaseInsensitiveComparer(CultureInfo)Initializes a new instance of the CaseInsensitiveComparer class using the specified System.Globalization.CultureInfo.
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  NameDescription
Public propertyStatic memberSupported by the XNA FrameworkDefaultGets an instance of CaseInsensitiveComparer that is associated with the Thread.CurrentCulture of the current thread and that is always available.
Public propertyStatic memberSupported by the XNA FrameworkDefaultInvariantGets an instance of CaseInsensitiveComparer that is associated with CultureInfo.InvariantCulture and that is always available.
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  NameDescription
Public methodSupported by the XNA FrameworkComparePerforms 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.
Public methodSupported by the XNA FrameworkEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkToStringReturns a string that represents the current object. (Inherited from Object.)
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CaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings.

The Comparer class is the default implementation of the IComparer interface and performs case-sensitive string comparisons.

The objects used as keys by a Hashtable are required to override the Object.GetHashCode method (or the IHashCodeProvider interface) and the Object.Equals method (or the IComparer interface). The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. For example, when creating a Hashtable, you must use this class with the CaseInsensitiveHashCodeProvider class or any case-insensitive IHashCodeProvider implementation.

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.

The following code example creates a case-sensitive hash table and a case-insensitive hash table and demonstrates the difference in their behavior, even if both contain the same elements.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 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 Phone 8.1, Windows Phone 8, 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.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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