ArrayList.GetRange(Int32, Int32) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
public:
virtual System::Collections::ArrayList ^ GetRange(int index, int count);public virtual System.Collections.ArrayList GetRange(int index, int count);abstract member GetRange : int * int -> System.Collections.ArrayList
override this.GetRange : int * int -> System.Collections.ArrayListPublic Overridable Function GetRange (index As Integer, count As Integer) As ArrayList參數
- count
- Int32
範圍中的元素數量。
傳回
一個 ArrayList 代表源 ArrayList元素的子集。
例外狀況
index 且 count 不表示 中 ArrayList有效元素範圍。
範例
以下程式碼範例說明如何設定並取得元素範圍。ArrayList
using System;
using System.Collections;
public class SamplesArrayList {
public static void Main() {
// Creates and initializes a new ArrayList.
ArrayList myAL = new ArrayList();
myAL.Add( "The" );
myAL.Add( "quick" );
myAL.Add( "brown" );
myAL.Add( "fox" );
myAL.Add( "jumps" );
myAL.Add( "over" );
myAL.Add( "the" );
myAL.Add( "lazy" );
myAL.Add( "dog" );
// Creates and initializes the source ICollection.
Queue mySourceList = new Queue();
mySourceList.Enqueue( "big" );
mySourceList.Enqueue( "gray" );
mySourceList.Enqueue( "wolf" );
// Displays the values of five elements starting at index 0.
ArrayList mySubAL = myAL.GetRange( 0, 5 );
Console.WriteLine( "Index 0 through 4 contains:" );
PrintValues( mySubAL, '\t' );
// Replaces the values of five elements starting at index 1 with the values in the ICollection.
myAL.SetRange( 1, mySourceList );
// Displays the values of five elements starting at index 0.
mySubAL = myAL.GetRange( 0, 5 );
Console.WriteLine( "Index 0 through 4 now contains:" );
PrintValues( mySubAL, '\t' );
}
public static void PrintValues( IEnumerable myList, char mySeparator ) {
foreach ( Object obj in myList )
Console.Write( "{0}{1}", mySeparator, obj );
Console.WriteLine();
}
}
/*
This code produces the following output.
Index 0 through 4 contains:
The quick brown fox jumps
Index 0 through 4 now contains:
The big gray wolf jumps
*/
Imports System.Collections
Public Class SamplesArrayList
Public Shared Sub Main()
' Creates and initializes a new ArrayList.
Dim myAL As New ArrayList()
myAL.Add("The")
myAL.Add("quick")
myAL.Add("brown")
myAL.Add("fox")
myAL.Add("jumps")
myAL.Add("over")
myAL.Add("the")
myAL.Add("lazy")
myAL.Add("dog")
' Creates and initializes the source ICollection.
Dim mySourceList As New Queue()
mySourceList.Enqueue("big")
mySourceList.Enqueue("gray")
mySourceList.Enqueue("wolf")
' Displays the values of five elements starting at index 0.
Dim mySubAL As ArrayList = myAL.GetRange(0, 5)
Console.WriteLine("Index 0 through 4 contains:")
PrintValues(mySubAL, vbTab)
' Replaces the values of five elements starting at index 1 with the values in the ICollection.
myAL.SetRange(1, mySourceList)
' Displays the values of five elements starting at index 0.
mySubAL = myAL.GetRange(0, 5)
Console.WriteLine("Index 0 through 4 now contains:")
PrintValues(mySubAL, vbTab)
End Sub
Public Shared Sub PrintValues(myList As IEnumerable, mySeparator As Char)
Dim obj As [Object]
For Each obj In myList
Console.Write("{0}{1}", mySeparator, obj)
Next obj
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' Index 0 through 4 contains:
' The quick brown fox jumps
' Index 0 through 4 now contains:
' The big gray wolf jumps
備註
此方法不會產生元素的複製品。 新事物 ArrayList 只是一個看源 ArrayList頭的視窗。 然而，所有後續對來源 ArrayList 的變更都必須透過此視窗 ArrayList完成。 如果直接對原始碼 ArrayList進行變更，檢視視窗 ArrayList 會失效，任何操作都會回傳一個 InvalidOperationException。
此方法為操作 O(1) 。