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StringComparer.GetHashCode Method

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Definition

Namespace:
System
Assembly:
System.Runtime.Extensions.dll
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

When overridden in a derived class, gets the hash code for the current StringComparer object.

Overloads

GetHashCode(String)

When overridden in a derived class, gets the hash code for the specified string.
GetHashCode(Object)

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

GetHashCode(String)

Source:
StringComparer.cs
Source:
StringComparer.cs
Source:
StringComparer.cs

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

public:
 abstract int GetHashCode(System::String ^ obj);
public abstract int GetHashCode (string obj);
override this.GetHashCode : string -> int
Public MustOverride Function GetHashCode (obj As String) As Integer

Parameters

obj
String

A string.

Returns

Int32

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

Implements

GetHashCode(T)

Exceptions

ArgumentException

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

ArgumentNullException

obj is null.

Remarks

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.

Applies to

GetHashCode(Object)

Source:
StringComparer.cs
Source:
StringComparer.cs
Source:
StringComparer.cs

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

public:
 virtual int GetHashCode(System::Object ^ obj);
public:
 int GetHashCode(System::Object ^ obj);
public int GetHashCode (object obj);
override this.GetHashCode : obj -> int
Public Function GetHashCode (obj As Object) As Integer

Parameters

obj
Object

An object.

Returns

Int32

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

Implements

GetHashCode(Object)

Exceptions

ArgumentException

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

ArgumentNullException

obj is null.

Remarks

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

The GetHashCode(Object) 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.

Applies to