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EqualityComparer<T>.GetHashCode Method (T)

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)

public abstract int GetHashCode(
	T obj


Type: T

The object for which to get a hash code.

Return Value

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




The type of obj is a reference type and obj is null.

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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