ListDictionary コンストラクタ (IComparer)
アセンブリ: System (system.dll 内)


比較演算子は 2 つのキーが等しいかどうかを判断します。ListDictionary 内のすべてのキーは一意である必要があります。既定の比較演算子は、キーの Object.Equals の実装です。

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。


ListDictionary コンストラクタ

名前 | 説明 |
---|---|
ListDictionary () | 既定の比較演算子を使用して空の ListDictionary を作成します。 .NET Compact Framework によってサポートされています。 |
ListDictionary (IComparer) | 指定した比較演算子を使用して空の ListDictionary を作成します。 .NET Compact Framework によってサポートされています。 |

ListDictionary コンストラクタ ()
アセンブリ: System (system.dll 内)



ListDictionary のプロパティとメソッドのいくつかの例を次に示します。
Imports System Imports System.Collections Imports System.Collections.Specialized Public Class SamplesListDictionary Public Shared Sub Main() ' Creates and initializes a new ListDictionary. Dim myCol As New ListDictionary() myCol.Add("Braeburn Apples", "1.49") myCol.Add("Fuji Apples", "1.29") myCol.Add("Gala Apples", "1.49") myCol.Add("Golden Delicious Apples", "1.29") myCol.Add("Granny Smith Apples", "0.89") myCol.Add("Red Delicious Apples", "0.99") ' Display the contents of the collection using For Each. This is the preferred method. Console.WriteLine("Displays the elements using For Each:") PrintKeysAndValues(myCol) ' Display the contents of the collection using the enumerator. Console.WriteLine("Displays the elements using the IDictionaryEnumerator:") PrintKeysAndValues2(myCol) ' Display the contents of the collection using the Keys, Values, Count, and Item properties. Console.WriteLine("Displays the elements using the Keys, Values, Count, and Item properties:") PrintKeysAndValues3(myCol) ' Copies the ListDictionary to an array with DictionaryEntry elements. Dim myArr(myCol.Count) As DictionaryEntry myCol.CopyTo(myArr, 0) ' Displays the values in the array. Console.WriteLine("Displays the elements in the array:") Console.WriteLine(" KEY VALUE") Dim i As Integer For i = 0 To myArr.Length - 1 Console.WriteLine(" {0,-25} {1}", myArr(i).Key, myArr(i).Value) Next i Console.WriteLine() ' Searches for a key. If myCol.Contains("Kiwis") Then Console.WriteLine("The collection contains the key ""Kiwis"".") Else Console.WriteLine("The collection does not contain the key ""Kiwis"".") End If Console.WriteLine() ' Deletes a key. myCol.Remove("Plums") Console.WriteLine("The collection contains the following elements after removing ""Plums"":") 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 ' Uses the For Each statement which hides the complexity of the enumerator. ' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection. Public Shared Sub PrintKeysAndValues(myCol As IDictionary) Console.WriteLine(" KEY VALUE") Dim de As DictionaryEntry For Each de In myCol Console.WriteLine(" {0,-25} {1}", de.Key, de.Value) Next de Console.WriteLine() End Sub 'PrintKeysAndValues ' Uses the enumerator. ' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection. Public Shared Sub PrintKeysAndValues2(myCol As IDictionary) Dim myEnumerator As IDictionaryEnumerator = myCol.GetEnumerator() Console.WriteLine(" KEY VALUE") While myEnumerator.MoveNext() Console.WriteLine(" {0,-25} {1}", myEnumerator.Key, myEnumerator.Value) End While Console.WriteLine() End Sub 'PrintKeysAndValues2 ' Uses the Keys, Values, Count, and Item properties. Public Shared Sub PrintKeysAndValues3(myCol As ListDictionary) Dim myKeys(myCol.Count) As [String] myCol.Keys.CopyTo(myKeys, 0) Console.WriteLine(" INDEX KEY VALUE") Dim i As Integer For i = 0 To myCol.Count - 1 Console.WriteLine(" {0,-5} {1,-25} {2}", i, myKeys(i), myCol(myKeys(i))) Next i Console.WriteLine() End Sub 'PrintKeysAndValues3 End Class 'SamplesListDictionary 'This code produces the following output. 'Note that because a dictionary is implemented for fast keyed access the order 'of the items in the dictionary are not gauranteed and, as a result, should not 'be depended on. ' 'Displays the elements using for each: ' KEY VALUE ' Braeburn Apples 1.49 ' Fuji Apples 1.29 ' Gala Apples 1.49 ' Golden Delicious Apples 1.29 ' Granny Smith Apples 0.89 ' Red Delicious Apples 0.99 ' 'Displays the elements using the IDictionaryEnumerator: ' KEY VALUE ' Braeburn Apples 1.49 ' Fuji Apples 1.29 ' Gala Apples 1.49 ' Golden Delicious Apples 1.29 ' Granny Smith Apples 0.89 ' Red Delicious Apples 0.99 ' 'Displays the elements using the Keys, Values, Count, and Item properties: ' INDEX KEY VALUE ' 0 Braeburn Apples 1.49 ' 1 Fuji Apples 1.29 ' 2 Gala Apples 1.49 ' 3 Golden Delicious Apples 1.29 ' 4 Granny Smith Apples 0.89 ' 5 Red Delicious Apples 0.99 ' 'Displays the elements in the array: ' KEY VALUE ' Braeburn Apples 1.49 ' Fuji Apples 1.29 ' Gala Apples 1.49 ' Golden Delicious Apples 1.29 ' Granny Smith Apples 0.89 ' Red Delicious Apples 0.99 ' 'The collection does not contain the key "Kiwis". ' 'The collection contains the following elements after removing "Plums": ' KEY VALUE ' Braeburn Apples 1.49 ' Fuji Apples 1.29 ' Gala Apples 1.49 ' Golden Delicious Apples 1.29 ' Granny Smith Apples 0.89 ' Red Delicious Apples 0.99 ' 'The collection contains the following elements after it is cleared: ' KEY VALUE '
using System; using System.Collections; using System.Collections.Specialized; public class SamplesListDictionary { public static void Main() { // Creates and initializes a new ListDictionary. ListDictionary myCol = new ListDictionary(); myCol.Add( "Braeburn Apples", "1.49" ); myCol.Add( "Fuji Apples", "1.29" ); myCol.Add( "Gala Apples", "1.49" ); myCol.Add( "Golden Delicious Apples", "1.29" ); myCol.Add( "Granny Smith Apples", "0.89" ); myCol.Add( "Red Delicious Apples", "0.99" ); // Display the contents of the collection using foreach. This is the preferred method. Console.WriteLine( "Displays the elements using foreach:" ); PrintKeysAndValues1( myCol ); // Display the contents of the collection using the enumerator. Console.WriteLine( "Displays the elements using the IDictionaryEnumerator:" ); PrintKeysAndValues2( myCol ); // Display the contents of the collection using the Keys, Values, Count, and Item properties. Console.WriteLine( "Displays the elements using the Keys, Values, Count, and Item properties:" ); PrintKeysAndValues3( myCol ); // Copies the ListDictionary to an array with DictionaryEntry elements. DictionaryEntry[] myArr = new DictionaryEntry[myCol.Count]; myCol.CopyTo( myArr, 0 ); // Displays the values in the array. Console.WriteLine( "Displays the elements in the array:" ); Console.WriteLine( " KEY VALUE" ); for ( int i = 0; i < myArr.Length; i++ ) Console.WriteLine( " {0,-25} {1}", myArr[i].Key, myArr[i].Value ); Console.WriteLine(); // Searches for a key. if ( myCol.Contains( "Kiwis" ) ) Console.WriteLine( "The collection contains the key \"Kiwis\"." ); else Console.WriteLine( "The collection does not contain the key \"Kiwis\"." ); Console.WriteLine(); // Deletes a key. myCol.Remove( "Plums" ); Console.WriteLine( "The collection contains the following elements after removing \"Plums\":" ); PrintKeysAndValues1( myCol ); // Clears the entire collection. myCol.Clear(); Console.WriteLine( "The collection contains the following elements after it is cleared:" ); PrintKeysAndValues1( myCol ); } // Uses the foreach statement which hides the complexity of the enumerator. // NOTE: The foreach statement is the preferred way of enumerating the contents of a collection. public static void PrintKeysAndValues1( IDictionary myCol ) { Console.WriteLine( " KEY VALUE" ); foreach ( DictionaryEntry de in myCol ) Console.WriteLine( " {0,-25} {1}", de.Key, de.Value ); Console.WriteLine(); } // Uses the enumerator. // NOTE: The foreach statement is the preferred way of enumerating the contents of a collection. public static void PrintKeysAndValues2( IDictionary myCol ) { IDictionaryEnumerator myEnumerator = myCol.GetEnumerator(); Console.WriteLine( " KEY VALUE" ); while ( myEnumerator.MoveNext() ) Console.WriteLine( " {0,-25} {1}", myEnumerator.Key, myEnumerator.Value ); Console.WriteLine(); } // Uses the Keys, Values, Count, and Item properties. public static void PrintKeysAndValues3( ListDictionary myCol ) { String[] myKeys = new String[myCol.Count]; myCol.Keys.CopyTo( myKeys, 0 ); Console.WriteLine( " INDEX KEY VALUE" ); for ( int i = 0; i < myCol.Count; i++ ) Console.WriteLine( " {0,-5} {1,-25} {2}", i, myKeys[i], myCol[myKeys[i]] ); Console.WriteLine(); } } /* This code produces output similar to the following. Note that because a dictionary is implemented for fast keyed access the order of the items in the dictionary are not gauranteed and, as a result, should not be depended on. Displays the elements using foreach: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the IDictionaryEnumerator: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the Keys, Values, Count, and Item properties: INDEX KEY VALUE 0 Braeburn Apples 1.49 1 Fuji Apples 1.29 2 Gala Apples 1.49 3 Golden Delicious Apples 1.29 4 Granny Smith Apples 0.89 5 Red Delicious Apples 0.99 Displays the elements in the array: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 The collection does not contain the key "Kiwis". The collection contains the following elements after removing "Plums": KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 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 PrintKeysAndValues1( IDictionary^ myCol ); void PrintKeysAndValues2( IDictionary^ myCol ); void PrintKeysAndValues3( ListDictionary^ myCol ); int main() { // Creates and initializes a new ListDictionary. ListDictionary^ myCol = gcnew ListDictionary; myCol->Add( "Braeburn Apples", "1.49" ); myCol->Add( "Fuji Apples", "1.29" ); myCol->Add( "Gala Apples", "1.49" ); myCol->Add( "Golden Delicious Apples", "1.29" ); myCol->Add( "Granny Smith Apples", "0.89" ); myCol->Add( "Red Delicious Apples", "0.99" ); // Display the contents of the collection using for each. This is the preferred method. Console::WriteLine( "Displays the elements using for each:" ); PrintKeysAndValues1( myCol ); // Display the contents of the collection using the enumerator. Console::WriteLine( "Displays the elements using the IDictionaryEnumerator:" ); PrintKeysAndValues2( myCol ); // Display the contents of the collection using the Keys, Values, Count, and Item properties. Console::WriteLine( "Displays the elements using the Keys, Values, Count, and Item properties:" ); PrintKeysAndValues3( myCol ); // Copies the ListDictionary to an array with DictionaryEntry elements. array<DictionaryEntry>^myArr = gcnew array<DictionaryEntry>(myCol->Count); myCol->CopyTo( myArr, 0 ); // Displays the values in the array. Console::WriteLine( "Displays the elements in the array:" ); Console::WriteLine( " KEY VALUE" ); for ( int i = 0; i < myArr->Length; i++ ) Console::WriteLine( " {0,-25} {1}", myArr[ i ].Key, myArr[ i ].Value ); Console::WriteLine(); // Searches for a key. if ( myCol->Contains( "Kiwis" ) ) Console::WriteLine( "The collection contains the key \"Kiwis\"." ); else Console::WriteLine( "The collection does not contain the key \"Kiwis\"." ); Console::WriteLine(); // Deletes a key. myCol->Remove( "Plums" ); Console::WriteLine( "The collection contains the following elements after removing \"Plums\":" ); PrintKeysAndValues2( myCol ); // Clears the entire collection. myCol->Clear(); Console::WriteLine( "The collection contains the following elements after it is cleared:" ); PrintKeysAndValues2( myCol ); } // Uses the for each statement which hides the complexity of the enumerator. // NOTE: The for each statement is the preferred way of enumerating the contents of a collection. void PrintKeysAndValues1( IDictionary^ myCol ) { Console::WriteLine( " KEY VALUE" ); for each ( DictionaryEntry^ de in myCol ) Console::WriteLine( " {0,-25} {1}", de->Key, de->Value ); Console::WriteLine(); } // Uses the enumerator. void PrintKeysAndValues2( IDictionary^ myCol ) { IDictionaryEnumerator^ myEnumerator = myCol->GetEnumerator(); Console::WriteLine( " KEY VALUE" ); while ( myEnumerator->MoveNext() ) Console::WriteLine( " {0,-25} {1}", myEnumerator->Key, myEnumerator->Value ); Console::WriteLine(); } // Uses the Keys, Values, Count, and Item properties. void PrintKeysAndValues3( ListDictionary^ myCol ) { array<String^>^myKeys = gcnew array<String^>(myCol->Count); myCol->Keys->CopyTo( myKeys, 0 ); Console::WriteLine( " INDEX KEY VALUE" ); for ( int i = 0; i < myCol->Count; i++ ) Console::WriteLine( " {0,-5} {1,-25} {2}", i, myKeys[ i ], myCol[ myKeys[ i ] ] ); Console::WriteLine(); } /* This code produces the following output. Displays the elements using for each: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the IDictionaryEnumerator: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the Keys, Values, Count, and Item properties: INDEX KEY VALUE 0 Braeburn Apples 1.49 1 Fuji Apples 1.29 2 Gala Apples 1.49 3 Golden Delicious Apples 1.29 4 Granny Smith Apples 0.89 5 Red Delicious Apples 0.99 Displays the elements in the array: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 The collection does not contain the key "Kiwis". The collection contains the following elements after removing "Plums": KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 The collection contains the following elements after it is cleared: KEY VALUE */
import System.*; import System.Collections.*; import System.Collections.Specialized.*; public class SamplesListDictionary { public static void main(String[] args) { // Creates and initializes a new ListDictionary. ListDictionary myCol = new ListDictionary(); myCol.Add("Braeburn Apples", "1.49"); myCol.Add("Fuji Apples", "1.29"); myCol.Add("Gala Apples", "1.49"); myCol.Add("Golden Delicious Apples", "1.29"); myCol.Add("Granny Smith Apples", "0.89"); myCol.Add("Red Delicious Apples", "0.99"); // Display the contents of the collection using for. This is the // preferred method. Console.WriteLine("Displays the elements using for:"); PrintKeysAndValues1(myCol); // Display the contents of the collection using the enumerator. Console.WriteLine("Displays the elements using the" + " IDictionaryEnumerator:"); PrintKeysAndValues2(myCol); // Display the contents of the collection using the Keys, Values , // Count, and Item properties. Console.WriteLine("Displays the elements using the Keys, Values," + " Count, and Item properties:"); PrintKeysAndValues3(myCol); // Copies the ListDictionary to an array with DictionaryEntry elements. DictionaryEntry myArr[] = new DictionaryEntry[myCol.get_Count()]; myCol.CopyTo(myArr, 0); // Displays the values in the array. Console.WriteLine("Displays the elements in the array:"); Console.WriteLine(" KEY VALUE"); for(int i = 0; i < myArr.length; i++) { Console.WriteLine(" {0,-25} {1}", myArr[i].get_Key(), myArr[i].get_Value()); } Console.WriteLine(); // Searches for a key. if (myCol.Contains("Kiwis")) { Console.WriteLine("The collection contains the key \"Kiwis\"."); } else { Console.WriteLine("The collection does not contain the key" + " \"Kiwis\"."); } Console.WriteLine(); // Deletes a key. myCol.Remove("Plums"); Console.WriteLine("The collection contains the following elements" + " after removing \"Plums\":"); PrintKeysAndValues1(myCol); // Clears the entire collection. myCol.Clear(); Console.WriteLine("The collection contains the following elements" + " after it is cleared:"); PrintKeysAndValues1(myCol); } //main // Uses the for statement which hides the complexity of the enumerator. // NOTE: The for statement is the preferred way of enumerating the // contents of a collection. public static void PrintKeysAndValues1(IDictionary myCol) { String strKeys[] = new String[myCol.get_Count()]; myCol.get_Keys().CopyTo(strKeys,0); Console.WriteLine(" KEY VALUE"); for (int iCtr = 0; iCtr < myCol.get_Count(); iCtr++) { Console.WriteLine(" {0,-25} {1}", strKeys[iCtr], myCol.get_Item(strKeys[iCtr])); } Console.WriteLine(); } //PrintKeysAndValues1 // Uses the enumerator. // NOTE: The for statement is the preferred way of enumerating the // contents of a collection. public static void PrintKeysAndValues2(IDictionary myCol) { IDictionaryEnumerator myEnumerator = myCol.GetEnumerator(); Console.WriteLine(" KEY VALUE"); while(myEnumerator.MoveNext()) { Console.WriteLine(" {0,-25} {1}", myEnumerator.get_Key() , myEnumerator.get_Value()); } Console.WriteLine(); } //PrintKeysAndValues2 // Uses the Keys, Values, Count, and Item properties. public static void PrintKeysAndValues3(ListDictionary myCol) { String myKeys[] = new String[myCol.get_Count()]; myCol.get_Keys().CopyTo(myKeys, 0); Console.WriteLine(" INDEX KEY VALUE"); for(int i=0; i < myCol.get_Count(); i++) { System.Console.WriteLine(" {0,-5} {1,-25} {2}",(Int32)i, myKeys[i],myCol.get_Item(myKeys[i])); } Console.WriteLine(); } //PrintKeysAndValues3 } //SamplesListDictionary /* Displays the elements using for: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the IDictionaryEnumerator: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 Displays the elements using the Keys, Values, Count, and Item properties: INDEX KEY VALUE 0 Braeburn Apples 1.49 1 Fuji Apples 1.29 2 Gala Apples 1.49 3 Golden Delicious Apples 1.29 4 Granny Smith Apples 0.89 5 Red Delicious Apples 0.99 Displays the elements in the array: KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 The collection does not contain the key "Kiwis". The collection contains the following elements after removing "Plums": KEY VALUE Braeburn Apples 1.49 Fuji Apples 1.29 Gala Apples 1.49 Golden Delicious Apples 1.29 Granny Smith Apples 0.89 Red Delicious Apples 0.99 The collection contains the following elements after it is cleared: KEY VALUE */

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。


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