IEqualityComparer<T>.GetHashCode(T) Method

Reference

Definition

Namespace:: System.Collections.Generic

Assemblies:: mscorlib.dll, System.Runtime.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

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Returns a hash code for the specified object.

public:
 int GetHashCode(T obj);

public int GetHashCode(T obj);

abstract member GetHashCode : 'T -> int

Public Function GetHashCode (obj As T) As Integer

Parameters

obj: T

The Object for which a hash code is to be returned.

Returns

Int32

A hash code for the specified object.

Exceptions

ArgumentNullException

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

Remarks

Implement this method to provide a customized hash code for type T, corresponding to the customized equality comparison provided by the Equals method.

Notes to Implementers

Implementations are required to ensure that if the Equals(T, T) method returns true for two objects x and y, then the value returned by the GetHashCode(T) method for x must equal the value returned for y.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP	10.0

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