SortedList.Remove(Object) 方法
定義
重要
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從 SortedList 物件中移除具有指定索引鍵的專案。
public:
virtual void Remove(System::Object ^ key);public virtual void Remove(object key);abstract member Remove : obj -> unit
override this.Remove : obj -> unitPublic Overridable Sub Remove (key As Object)參數
- key
- Object
關鍵是元素要移除。
實作
例外狀況
key 是 null。
範例
以下程式碼範例展示了如何從物件中移除元素 SortedList 。
using System;
using System.Collections;
public class SamplesSortedList {
public static void Main() {
// Creates and initializes a new SortedList.
SortedList mySL = new SortedList();
mySL.Add( "3c", "dog" );
mySL.Add( "2c", "over" );
mySL.Add( "1c", "brown" );
mySL.Add( "1a", "The" );
mySL.Add( "1b", "quick" );
mySL.Add( "3a", "the" );
mySL.Add( "3b", "lazy" );
mySL.Add( "2a", "fox" );
mySL.Add( "2b", "jumps" );
// Displays the SortedList.
Console.WriteLine( "The SortedList initially contains the following:" );
PrintKeysAndValues( mySL );
// Removes the element with the key "3b".
mySL.Remove( "3b" );
// Displays the current state of the SortedList.
Console.WriteLine( "After removing \"lazy\":" );
PrintKeysAndValues( mySL );
// Removes the element at index 5.
mySL.RemoveAt( 5 );
// Displays the current state of the SortedList.
Console.WriteLine( "After removing the element at index 5:" );
PrintKeysAndValues( mySL );
}
public static void PrintKeysAndValues( SortedList myList ) {
Console.WriteLine( "\t-KEY-\t-VALUE-" );
for ( int i = 0; i < myList.Count; i++ ) {
Console.WriteLine( "\t{0}:\t{1}", myList.GetKey(i), myList.GetByIndex(i) );
}
Console.WriteLine();
}
}
/*
This code produces the following output.
The SortedList initially contains the following:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3b: lazy
3c: dog
After removing "lazy":
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3c: dog
After removing the element at index 5:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
3a: the
3c: dog
*/
Imports System.Collections
Public Class SamplesSortedList
Public Shared Sub Main()
' Creates and initializes a new SortedList.
Dim mySL As New SortedList()
mySL.Add("3c", "dog")
mySL.Add("2c", "over")
mySL.Add("1c", "brown")
mySL.Add("1a", "The")
mySL.Add("1b", "quick")
mySL.Add("3a", "the")
mySL.Add("3b", "lazy")
mySL.Add("2a", "fox")
mySL.Add("2b", "jumps")
' Displays the SortedList.
Console.WriteLine("The SortedList initially contains the following:")
PrintKeysAndValues(mySL)
' Removes the element with the key "3b".
mySL.Remove("3b")
' Displays the current state of the SortedList.
Console.WriteLine("After removing ""lazy"":")
PrintKeysAndValues(mySL)
' Removes the element at index 5.
mySL.RemoveAt(5)
' Displays the current state of the SortedList.
Console.WriteLine("After removing the element at index 5:")
PrintKeysAndValues(mySL)
End Sub
Public Shared Sub PrintKeysAndValues(myList As SortedList)
Console.WriteLine(ControlChars.Tab & "-KEY-" & ControlChars.Tab & _
"-VALUE-")
Dim i As Integer
For i = 0 To myList.Count - 1
Console.WriteLine(ControlChars.Tab & "{0}:" & ControlChars.Tab & _
"{1}", myList.GetKey(i), myList.GetByIndex(i))
Next i
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' The SortedList initially contains the following:
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 2c: over
' 3a: the
' 3b: lazy
' 3c: dog
'
' After removing "lazy":
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 2c: over
' 3a: the
' 3c: dog
'
' After removing the element at index 5:
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 3a: the
' 3c: dog
備註
若 SortedList 物件不包含指定鍵的元素，則 SortedList 保持不變。 沒例外拋出。
在連續元素的集合中，例如列表，緊接被移除元素後的元素會往上移動，佔據空出的位置。 若集合被索引，移動元素的索引也會同步更新。 此行為不適用於將元素概念上分組為桶的集合，例如雜湊表。
此方法是一個 O(n) 運算，其中 n 為 Count。
