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EqualityComparer<T>.GetHashCode Method (T)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When overridden in a derived class, serves as a hash function for the specified object for hashing algorithms and data structures, such as a hash table.

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

Syntax

'Declaration
Public MustOverride Function GetHashCode ( _
    obj As T _
) As Integer

public abstract int GetHashCode(
    T obj
)

Parameters

  • obj
    Type: T
    The object for which to get a hash code.

Return Value

Type: System.Int32
A hash code for the specified object.

Implements

IEqualityComparer<T>.GetHashCode(T)

Exceptions

Exception Condition
ArgumentNullException

The type of obj is a reference type and obj is nulla null reference (Nothing in Visual Basic).

Remarks

Notes to Inheritors

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.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.