CaseInsensitiveHashCodeProvider 類別

定義

命名空間:

System.Collections

組件:

System.Collections.NonGeneric.dll

來源:

CaseInsensitiveHashCodeProvider.cs

警告

CaseInsensitiveHashCodeProvider has been deprecated. Use StringComparer instead.

使用忽略字串大小寫的雜湊演算法，提供物件的雜湊程式碼。

public ref class CaseInsensitiveHashCodeProvider : System::Collections::IHashCodeProvider

[System.Obsolete("CaseInsensitiveHashCodeProvider has been deprecated. Use StringComparer instead.")]
public class CaseInsensitiveHashCodeProvider : System.Collections.IHashCodeProvider

[<System.Obsolete("CaseInsensitiveHashCodeProvider has been deprecated. Use StringComparer instead.")>]
type CaseInsensitiveHashCodeProvider = class
    interface IHashCodeProvider

Public Class CaseInsensitiveHashCodeProvider
Implements IHashCodeProvider

繼承

Object

CaseInsensitiveHashCodeProvider

屬性

ObsoleteAttribute

實作

IHashCodeProvider

範例

下列程式代碼範例會建立區分大小寫的哈希表和不區分大小寫的哈希表，並示範其行為的差異，即使兩者都包含相同的元素也一樣。

using namespace System;
using namespace System::Collections;
using namespace System::Globalization;
int main()
{
   
   // Create a Hashtable using the default hash code provider and the default comparer.
   Hashtable^ myHT1 = gcnew Hashtable;
   myHT1->Add( "FIRST", "Hello" );
   myHT1->Add( "SECOND", "World" );
   myHT1->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the culture of the current thread.
   Hashtable^ myHT2 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider,gcnew CaseInsensitiveComparer );
   myHT2->Add( "FIRST", "Hello" );
   myHT2->Add( "SECOND", "World" );
   myHT2->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the InvariantCulture.
   Hashtable^ myHT3 = gcnew Hashtable( CaseInsensitiveHashCodeProvider::DefaultInvariant,CaseInsensitiveComparer::DefaultInvariant );
   myHT3->Add( "FIRST", "Hello" );
   myHT3->Add( "SECOND", "World" );
   myHT3->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
   CultureInfo^ myCul = gcnew CultureInfo( "tr-TR" );
   Hashtable^ myHT4 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider( myCul ),gcnew CaseInsensitiveComparer( myCul ) );
   myHT4->Add( "FIRST", "Hello" );
   myHT4->Add( "SECOND", "World" );
   myHT4->Add( "THIRD", "!" );
   
   // Search for a key in each hashtable.
   Console::WriteLine( "first is in myHT1: {0}", myHT1->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT2: {0}", myHT2->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT3: {0}", myHT3->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT4: {0}", myHT4->ContainsKey( "first" ) );
}

/* 
This code produces the following output.  Results vary depending on the system's culture settings.

first is in myHT1: False
first is in myHT2: True
first is in myHT3: True
first is in myHT4: False

*/

using System;
using System.Collections;
using System.Globalization;

public class SamplesHashtable  {

   public static void Main()  {

      // Create a Hashtable using the default hash code provider and the default comparer.
      Hashtable myHT1 = new Hashtable();
      myHT1.Add("FIRST", "Hello");
      myHT1.Add("SECOND", "World");
      myHT1.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the culture of the current thread.
      Hashtable myHT2 = new Hashtable( new CaseInsensitiveHashCodeProvider(), new CaseInsensitiveComparer() );
      myHT2.Add("FIRST", "Hello");
      myHT2.Add("SECOND", "World");
      myHT2.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the InvariantCulture.
      Hashtable myHT3 = new Hashtable( CaseInsensitiveHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant );
      myHT3.Add("FIRST", "Hello");
      myHT3.Add("SECOND", "World");
      myHT3.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
      CultureInfo myCul = new CultureInfo( "tr-TR" );
      Hashtable myHT4 = new Hashtable( new CaseInsensitiveHashCodeProvider( myCul ), new CaseInsensitiveComparer( myCul ) );
      myHT4.Add("FIRST", "Hello");
      myHT4.Add("SECOND", "World");
      myHT4.Add("THIRD", "!");

      // Search for a key in each hashtable.
      Console.WriteLine( "first is in myHT1: {0}", myHT1.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT2: {0}", myHT2.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT3: {0}", myHT3.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT4: {0}", myHT4.ContainsKey( "first" ) );
   }
}


/*
This code produces the following output.  Results vary depending on the system's culture settings.

first is in myHT1: False
first is in myHT2: True
first is in myHT3: True
first is in myHT4: False

*/

Imports System.Collections
Imports System.Globalization

Public Class SamplesHashtable

   Public Shared Sub Main()

      ' Create a Hashtable using the default hash code provider and the default comparer.
      Dim myHT1 As New Hashtable()
      myHT1.Add("FIRST", "Hello")
      myHT1.Add("SECOND", "World")
      myHT1.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the culture of the current thread.
      Dim myHT2 As New Hashtable(New CaseInsensitiveHashCodeProvider(), New CaseInsensitiveComparer())
      myHT2.Add("FIRST", "Hello")
      myHT2.Add("SECOND", "World")
      myHT2.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the InvariantCulture.
      Dim myHT3 As New Hashtable(CaseInsensitiveHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant)
      myHT3.Add("FIRST", "Hello")
      myHT3.Add("SECOND", "World")
      myHT3.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
      Dim myCul As New CultureInfo("tr-TR")
      Dim myHT4 As New Hashtable(New CaseInsensitiveHashCodeProvider(myCul), New CaseInsensitiveComparer(myCul))
      myHT4.Add("FIRST", "Hello")
      myHT4.Add("SECOND", "World")
      myHT4.Add("THIRD", "!")

      ' Search for a key in each hashtable.
      Console.WriteLine("first is in myHT1: {0}", myHT1.ContainsKey("first"))
      Console.WriteLine("first is in myHT2: {0}", myHT2.ContainsKey("first"))
      Console.WriteLine("first is in myHT3: {0}", myHT3.ContainsKey("first"))
      Console.WriteLine("first is in myHT4: {0}", myHT4.ContainsKey("first"))

   End Sub

End Class


'This code produces the following output.  Results vary depending on the system's culture settings.
'
'first is in myHT1: False
'first is in myHT2: True
'first is in myHT3: True
'first is in myHT4: False

備註

CaseInsensitiveHashCodeProvider會IHashCodeProvider實作支援字串不區分大小寫比較的介面，就像實作支援字串不區分大小寫比較的介面一樣CaseInsensitiveComparerIComparer。

重要

不建議您將 類別用於 CaseInsensitiveHashCodeProvider 新的開發。 相反地，建議您使用 System.StringComparer 、 StringComparer.InvariantCultureIgnoreCase或 StringComparer.OrdinalIgnoreCase 屬性所StringComparer.CurrentCultureIgnoreCase傳回的物件。

使用 做為 索引鍵的對象 Hashtable ，必須覆寫 Object.GetHashCode 方法 (或 IHashCodeProvider 介面) 和 Object.Equals 方法 (或 IComparer 介面) 。 這兩個方法或介面的實作必須以相同方式處理區分大小寫;否則， Hashtable 的行為可能不正確。 例如，建立 Hashtable時，您必須將此類別與 類別或任何不區分大小寫的IComparer實作搭配CaseInsensitiveComparer使用。

建構函式

CaseInsensitiveHashCodeProvider()	已淘汰. 使用目前執行緒的 CaseInsensitiveHashCodeProvider，初始化 CurrentCulture 類別的新執行個體。
CaseInsensitiveHashCodeProvider(CultureInfo)	已淘汰. 使用指定的 CaseInsensitiveHashCodeProvider，初始化 CultureInfo 類別的新執行個體。

屬性

Default	已淘汰. 取得 CaseInsensitiveHashCodeProvider 的執行個體，它與目前執行緒的 CurrentCulture 相關聯，而且永遠可以使用。
DefaultInvariant	已淘汰. 取得 CaseInsensitiveHashCodeProvider 的執行個體，它與 InvariantCulture 相關聯，而且永遠可以使用。

方法

Equals(Object)	已淘汰. 判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	已淘汰. 做為預設雜湊函式。 (繼承來源 Object)
GetHashCode(Object)	已淘汰. 傳回給定物件的雜湊程式碼，使用忽略字串大小寫的雜湊演算法。
GetType()	已淘汰. 取得目前執行個體的 Type。 (繼承來源 Object)
MemberwiseClone()	已淘汰. 建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	已淘汰. 傳回代表目前物件的字串。 (繼承來源 Object)

另請參閱

• Hashtable
• IHashCodeProvider
• CurrentCulture
• CultureInfo
• CaseInsensitiveComparer
• 在集合中執行 Culture-Insensitive 字串作業