IEqualityComparer.GetHashCode Method (Object)
.NET Framework (current version)
Returns a hash code for the specified object.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- obj
-
Type:
System.Object
The Object for which a hash code is to be returned.
| Exception | Condition |
|---|---|
| ArgumentNullException | The type of obj is a reference type and obj is null. |
Implement this method to provide customized hash codes for objects,corresponding to the customized equality comparison provided by the Equals method.
Notes to Implementers:
Implementations are required to ensure that if the Equals method returns true for two objects x and y, then the value returned by the GetHashCode method for x must equal the value returned for y.
The following code example demonstrates the implementation of a case-insensitive IEqualityComparer. In this example, the GetHashCode method returns the hash code provided by the Object type.
Public Class myCultureComparer Implements IEqualityComparer Dim myComparer As CaseInsensitiveComparer Public Sub New() myComparer = CaseInsensitiveComparer.DefaultInvariant End Sub Public Sub New(ByVal myCulture As CultureInfo) myComparer = New CaseInsensitiveComparer(myCulture) End Sub Public Function Equals1(ByVal x As Object, ByVal y As Object) _ As Boolean Implements IEqualityComparer.Equals If (myComparer.Compare(x, y) = 0) Then Return True Else Return False End If End Function Public Function GetHashCode1(ByVal obj As Object) _ As Integer Implements IEqualityComparer.GetHashCode Return obj.ToString().ToLower().GetHashCode() End Function End Class
Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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