GetHashCode Method (String)
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StringComparer.GetHashCode Method (String)

 

When overridden in a derived class, gets the hash code for the specified string.

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

Public MustOverride Function GetHashCode (
	obj As String
) As Integer

Parameters

obj
Type: System.String

A string.

Return Value

Type: System.Int32

A 32-bit signed hash code calculated from the value of the obj parameter.

Exception Condition
ArgumentException

Not enough memory is available to allocate the buffer that is required to compute the hash code.

ArgumentNullException

obj is null.

The GetHashCode(String) method is more efficient than the GetHashCode(Object) method because the obj parameter does not have to be unboxed to perform the operation.

The GetHashCode(String) method allocates an amount of memory that is proportional to the size of obj to calculate the hash code of obj. In the case of large strings, trying to retrieve the hash code can throw an ArgumentException. Instead, you can use an alternate algorithm that allocates a fixed amount of memory when calculating hash codes. To use this algorithm, add the <NetFx45_CultureAwareComparerGetHashCode_LongStrings> element to the <runtime> section of your application's configuration file.

Universal Windows Platform
Available since 4.5
.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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