vb.net中应用 ArrayList
2006-12-14 20:13
375 查看
ArrayList 就是数组列表,它位于 System.Collections名称空间下。是集和类型。 与 ArrayList 同胞的还有一个List,他们的实用很相似。我们只介绍一些关于ArrayList的一些东东。
ArrayList有三个构造器:
ArrayList()
ArrayList(int32)
ArrayList(ICollection)
一个简单的例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.Add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.AddRange(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
For Each aa As String In t
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(aa.ToString())
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Next
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'会依次输出:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'Northsnow
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'塞北的雪
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'http://blog.csdn.net/precipitant
ArrayList的构造器可以接受一个集和,例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim sb As New System.Text.StringBuilder()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
If t.Count > 0 Then
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append("ArrayList中共有 成员 ")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(t.Count.ToString)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(" 个")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
For Each aa As String In t
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.AppendLine()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(aa)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Next
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
End If
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(sb.ToString)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'最后输出结果为:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'ArrayList中共有 成员 3 个
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'Northsnow
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'塞北的雪
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'http://blog.csdn.net/precipitant
另外还可以给 ArrayList的构造器传递一个整数,以设定ArrayList的初始容量。并可以通过 更改 Capacity属性的值更改 当前 ArrayList的容量,也可以用 TrimToSize方法将容量压缩成实际的元素数量,例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList(10)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.AddRange(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.Capacity = 6
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.TrimToSize()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
't.Capacity = t.Count 与 t.TrimToSize() 等效
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'依次输出:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'10
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'6
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'3
由于ArrayList是集和类型,所以它具有一些集和的操作方法。比如 遍历,查找,插入 等操作。同时 ArrayList还相当于一个大小可自由改变的一维数组。所以当然也可以像对待数组一样对他进行操作。
ArrayList有三个构造器:
ArrayList()
ArrayList(int32)
ArrayList(ICollection)
一个简单的例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.Add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.AddRange(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
For Each aa As String In t
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(aa.ToString())
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Next
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'会依次输出:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'Northsnow
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'塞北的雪
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'http://blog.csdn.net/precipitant
ArrayList的构造器可以接受一个集和,例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim sb As New System.Text.StringBuilder()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
If t.Count > 0 Then
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append("ArrayList中共有 成员 ")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(t.Count.ToString)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(" 个")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
For Each aa As String In t
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.AppendLine()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
sb.Append(aa)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Next
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
End If
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(sb.ToString)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'最后输出结果为:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'ArrayList中共有 成员 3 个
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'Northsnow
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'塞北的雪
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'http://blog.csdn.net/precipitant
另外还可以给 ArrayList的构造器传递一个整数,以设定ArrayList的初始容量。并可以通过 更改 Capacity属性的值更改 当前 ArrayList的容量,也可以用 TrimToSize方法将容量压缩成实际的元素数量,例子如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim t As New ArrayList(10)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
Dim d As New Collection
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("Northsnow")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("塞北的雪")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
d.Add("http://blog.csdn.net/precipitant")
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.AddRange(d)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.Capacity = 6
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
t.TrimToSize()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
't.Capacity = t.Count 与 t.TrimToSize() 等效
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
MsgBox(t.Capacity)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'依次输出:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'10
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'6
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
'3
由于ArrayList是集和类型,所以它具有一些集和的操作方法。比如 遍历,查找,插入 等操作。同时 ArrayList还相当于一个大小可自由改变的一维数组。所以当然也可以像对待数组一样对他进行操作。
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