CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer Class

定義

2 つのオブジェクトが等しいかどうかを比較します。比較時には文字列の大文字と小文字は区別されません。Compares two objects for equivalence, ignoring the case of strings.

public ref class CaseInsensitiveComparer : System::Collections::IComparer
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class CaseInsensitiveComparer : System.Collections.IComparer
type CaseInsensitiveComparer = class
    interface IComparer
Public Class CaseInsensitiveComparer
Implements IComparer
継承
CaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparer
属性
実装

次のコード例では、大文字と小文字を区別するハッシュテーブルと大文字と小文字を区別しないハッシュテーブルを作成し、両方に同じ要素が含まれている場合でも、それらの動作の違いを示します。The following code example creates a case-sensitive hash table and a case-insensitive hash table and demonstrates the difference in their behavior, even if both contain the same elements.

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

注釈

CaseInsensitiveComparer文字列にIComparer対して大文字と小文字を区別しないCaseInsensitiveHashCodeProvider比較をIHashCodeProviderサポートするインターフェイスを実装するのと同様に、文字列に対する大文字と小文字を区別しない比較をサポートするインターフェイスを実装CaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings.

重要

新しい開発にはCaseInsensitiveComparerクラスを使用しないことをお勧めします。We don't recommend that you use the CaseInsensitiveComparer class for new development. 代わりに、、 System.StringComparer StringComparer.InvariantCultureIgnoreCase、またはStringComparer.CurrentCultureIgnoreCase StringComparer.OrdinalIgnoreCaseプロパティによって返されるオブジェクトを使用することをお勧めします。Instead, we recommend that you use the System.StringComparer object returned by the StringComparer.CurrentCultureIgnoreCase, StringComparer.InvariantCultureIgnoreCase, or StringComparer.OrdinalIgnoreCase property.

クラスはIComparerインターフェイスの既定の実装であり、大文字と小文字を区別する文字列比較を実行します。 ComparerThe Comparer class is the default implementation of the IComparer interface and performs case-sensitive string comparisons.

によっHashtableてキーとして使用されるオブジェクトはObject.GetHashCode 、メソッド (またIHashCodeProviderIComparerインターフェイス) とObject.Equalsメソッド (またはインターフェイス) をオーバーライドするために必要です。The objects used as keys by a Hashtable are required to override the Object.GetHashCode method (or the IHashCodeProvider interface) and the Object.Equals method (or the IComparer interface). メソッドまたはインターフェイスの実装では、大文字と小文字の区別を同じように処理する必要があります。それ以外のHashtable場合、が正しく動作しない可能性があります。The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. たとえば、を作成Hashtableする場合は、 CaseInsensitiveHashCodeProviderクラスまたは大文字と小文字を区別IHashCodeProviderしない実装で、このクラスを使用する必要があります。For example, when creating a Hashtable, you must use this class with the CaseInsensitiveHashCodeProvider class or any case-insensitive IHashCodeProvider implementation.

文字列比較の結果は、カルチャによって異なる場合があります。String comparisons might have different results depending on the culture. カルチャ固有の比較の詳細については、 System.Globalization 「名前空間とグローバリゼーションおよびローカリゼーション」を参照してください。For more information on culture-specific comparisons, see the System.Globalization namespace and Globalization and Localization.

コンストラクター

CaseInsensitiveComparer() CaseInsensitiveComparer() CaseInsensitiveComparer() CaseInsensitiveComparer()

現在のスレッドの CaseInsensitiveComparer を使用して、CurrentCulture クラスの新しいインスタンスを初期化します。Initializes a new instance of the CaseInsensitiveComparer class using the CurrentCulture of the current thread.

CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo)

指定した CultureInfo を使用して CaseInsensitiveComparer クラスの新しいインスタンスを初期化します。Initializes a new instance of the CaseInsensitiveComparer class using the specified CultureInfo.

プロパティ

Default Default Default Default

現在のスレッドの CaseInsensitiveComparer に関連付けられた、常に使用できる CurrentCulture のインスタンスを取得します。Gets an instance of CaseInsensitiveComparer that is associated with the CurrentCulture of the current thread and that is always available.

DefaultInvariant DefaultInvariant DefaultInvariant DefaultInvariant

CaseInsensitiveComparer に関連付けられた、常に使用できる InvariantCulture のインスタンスを取得します。Gets an instance of CaseInsensitiveComparer that is associated with InvariantCulture and that is always available.

メソッド

Compare(Object, Object) Compare(Object, Object) Compare(Object, Object) Compare(Object, Object)

同じ型の 2 つのオブジェクトに対して大文字小文字を区別しない比較を実行し、一方が他方よりも小さいか、等しいか、大きいかを示す値を返します。Performs a case-insensitive comparison of two objects of the same type and returns a value indicating whether one is less than, equal to, or greater than the other.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

既定のハッシュ関数として機能します。Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

現在のインスタンスの Type を取得します。Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

現在の Object の簡易コピーを作成します。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

現在のオブジェクトを表す文字列を返します。Returns a string that represents the current object.

(Inherited from Object)

適用対象

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