指定したキーを持つエントリを文字列ディクショナリから削除します。
名前空間: System.Collections.Specialized
アセンブリ: System (system.dll 内)
構文
'宣言
Public Overridable Sub Remove ( _
key As String _
)
'使用
Dim instance As StringDictionary
Dim key As String
instance.Remove(key)
public virtual void Remove (
string key
)
public:
virtual void Remove (
String^ key
)
public void Remove (
String key
)
public function Remove (
key : String
)
パラメータ
- key
削除するエントリのキー。
例外
| 例外の種類 | 条件 |
|---|---|
キーが null 参照 (Visual Basic では Nothing) です。 |
|
StringDictionary は読み取り専用です。 |
解説
指定したキーを持つ要素が StringDictionary に格納されていない場合、StringDictionary は変更されません。例外はスローされません。
キーは大文字と小文字を区別せずに処理されます。つまり、キーは、文字列ディクショナリから削除するエントリを検索するために使用される前に、小文字に変換されます。
このメソッドは O(1) 操作です。
使用例
StringDictionary に対して要素を追加および削除する方法のコード例を次に示します。
Imports System
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesStringDictionary
Public Shared Sub Main()
' Creates and initializes a new StringDictionary.
Dim myCol As New StringDictionary()
myCol.Add("red", "rojo")
myCol.Add("green", "verde")
myCol.Add("blue", "azul")
' Displays the values in the StringDictionary.
Console.WriteLine("Initial contents of the StringDictionary:")
PrintKeysAndValues(myCol)
' Deletes an element.
myCol.Remove("green")
Console.WriteLine("The collection contains the following elements after removing ""green"":")
PrintKeysAndValues(myCol)
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("The collection contains the following elements after it is cleared:")
PrintKeysAndValues(myCol)
End Sub 'Main
Public Shared Sub PrintKeysAndValues(myCol As StringDictionary)
Dim de As DictionaryEntry
Console.WriteLine(" KEY VALUE")
For Each de In myCol
Console.WriteLine(" {0,-10} {1}", de.Key, de.Value)
Next de
Console.WriteLine()
End Sub 'PrintKeysAndValues
End Class 'SamplesStringDictionary
'This code produces the following output.
'
'Initial contents of the StringDictionary:
' KEY VALUE
' green verde
' red rojo
' blue azul
'
'The collection contains the following elements after removing "green":
' KEY VALUE
' red rojo
' blue azul
'
'The collection contains the following elements after it is cleared:
' KEY VALUE
'
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesStringDictionary {
public static void Main() {
// Creates and initializes a new StringDictionary.
StringDictionary myCol = new StringDictionary();
myCol.Add( "red", "rojo" );
myCol.Add( "green", "verde" );
myCol.Add( "blue", "azul" );
// Displays the values in the StringDictionary.
Console.WriteLine( "Initial contents of the StringDictionary:" );
PrintKeysAndValues( myCol );
// Deletes an element.
myCol.Remove( "green" );
Console.WriteLine( "The collection contains the following elements after removing \"green\":" );
PrintKeysAndValues( myCol );
// Clears the entire collection.
myCol.Clear();
Console.WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues( myCol );
}
public static void PrintKeysAndValues( StringDictionary myCol ) {
Console.WriteLine( " KEY VALUE" );
foreach ( DictionaryEntry de in myCol )
Console.WriteLine( " {0,-10} {1}", de.Key, de.Value );
Console.WriteLine();
}
}
/*
This code produces the following output.
Initial contents of the StringDictionary:
KEY VALUE
green verde
red rojo
blue azul
The collection contains the following elements after removing "green":
KEY VALUE
red rojo
blue azul
The collection contains the following elements after it is cleared:
KEY VALUE
*/
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintKeysAndValues( StringDictionary^ myCol )
{
Console::WriteLine( " KEY VALUE" );
IEnumerator^ enum0 = myCol->GetEnumerator();
while ( enum0->MoveNext() )
{
DictionaryEntry^ de = safe_cast<DictionaryEntry^>(enum0->Current);
Console::WriteLine( " {0,-10} {1}", de->Key, de->Value );
}
Console::WriteLine();
}
int main()
{
// Creates and initializes a new StringDictionary.
StringDictionary^ myCol = gcnew StringDictionary;
myCol->Add( "red", "rojo" );
myCol->Add( "green", "verde" );
myCol->Add( "blue", "azul" );
// Displays the values in the StringDictionary.
Console::WriteLine( "Initial contents of the StringDictionary:" );
PrintKeysAndValues( myCol );
// Deletes an element.
myCol->Remove( "green" );
Console::WriteLine( "The collection contains the following elements after removing \"green\":" );
PrintKeysAndValues( myCol );
// Clears the entire collection.
myCol->Clear();
Console::WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues( myCol );
}
/*
This code produces the following output.
Initial contents of the StringDictionary:
KEY VALUE
green verde
red rojo
blue azul
The collection contains the following elements after removing "green":
KEY VALUE
red rojo
blue azul
The collection contains the following elements after it is cleared:
KEY VALUE
*/
import System.*;
import System.Collections.*;
import System.Collections.Specialized.*;
public class SamplesStringDictionary
{
public static void main(String[] args)
{
// Creates and initializes a new StringDictionary.
StringDictionary myCol = new StringDictionary();
myCol.Add("red", "rojo");
myCol.Add("green", "verde");
myCol.Add("blue", "azul");
// Displays the values in the StringDictionary.
Console.WriteLine("Initial contents of the StringDictionary:");
PrintKeysAndValues(myCol);
// Deletes an element.
myCol.Remove("green");
Console.WriteLine("The collection contains the following elements"
+ " after removing \"green\":");
PrintKeysAndValues(myCol);
// Clears the entire collection.
myCol.Clear();
Console.WriteLine("The collection contains the following elements"
+ " after it is cleared:");
PrintKeysAndValues(myCol);
}//main
public static void PrintKeysAndValues(StringDictionary myCol)
{
Console.WriteLine(" KEY VALUE");
IEnumerator objEnum = myCol.GetEnumerator();
while (objEnum.MoveNext()) {
DictionaryEntry de = (DictionaryEntry)objEnum.get_Current();
Console.WriteLine(" {0,-10} {1}", de.get_Key(), de.get_Value());
}
Console.WriteLine();
} //PrintKeysAndValues
} //SamplesStringDictionary
/*
This code produces the following output.
Initial contents of the StringDictionary:
KEY VALUE
red rojo
blue azul
green verde
The collection contains the following elements after removing "green":
KEY VALUE
red rojo
blue azul
The collection contains the following elements after it is cleared:
KEY VALUE
*/
プラットフォーム
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0
参照
関連項目
StringDictionary クラス
StringDictionary メンバ
System.Collections.Specialized 名前空間
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