敘述VB.NET創(chuàng)建控件數(shù)組
VB.NET還是比較常用的,于是我研究了一下VB.NET創(chuàng)建控件數(shù)組,在這里拿出來(lái)和大家分享一下,希望對(duì)大家有用。
在VB.NET創(chuàng)建控件數(shù)組
首先創(chuàng)建一個(gè)Button類型控件數(shù)組:
1、創(chuàng)建“Windows應(yīng)用程序”類型的工程,添加名為ButtonArray的類,并使該類繼承 System.Collection.CollectionBase 類。System.Collections.CollectionBase類是.NET框架類庫(kù)中為集合操作提供抽象的基類,通過(guò)對(duì)它的繼承可以為我們的 ButtonArray類具備集合增加、刪除、索引的功能。
2、為ButtonArray類添加ParentForm屬性,即控件組所在窗體,創(chuàng)建初始化函數(shù)(構(gòu)造函數(shù));
3、為控件數(shù)組類增加AddItem方法,該方法在控件數(shù)組類中添加成員;
4、為控件數(shù)組類增加RemoveItem方法,該方法在控件數(shù)組中刪除一個(gè)成員。
VB.NET創(chuàng)建控件數(shù)組代碼示例:
- Public Class ButtonArray
- Inherits System.Collections.CollectionBase
- Private ReadOnly ParentForm As System.Windows.Forms.Form
- Public Sub New(ByVal pForm As System.Windows.Forms.Form)
- ParentForm = pForm
- End Sub
- Default Public ReadOnly Property Item(ByVal index As Integer)
As System.Windows.Forms.Button- Get
- Return Me.List.Item(index) @# ButtonArray的List 屬性從CollectionBase 繼承
- End Get
- End Property
- Public Sub AddItem()
- Dim btnItem As New System.Windows.Forms.Button
- Me.List.Add(btnItem)
- ParentForm.Controls.Add(btnItem)@#向窗體中增加控件
- btnItem.Tag = Me.Count@#Count屬性從CollectionBase 繼承
- btnItem.Top = Me.Count * 30
- btnItem.Left = 200
- btnItem.Text = "Button" & Me.Count.ToString
- AddHandler btnItem.Click, AddressOf btnItem_Click @#綁定事件處理程序
- End Sub
- Public Sub AddItem(ByVal btnItem As System.Windows.Forms.Button)
- Me.List.Add(btnItem)
- AddHandler btnItem.Click, AddressOf btnItem_Click @#綁定事件處理程序
- End Sub
- Public Sub RemoveItem()
- If Me.Count > 0 Then
- ParentForm.Controls.Remove(Me(Me.Count - 1))
- Me.List.RemoveAt(Me.Count - 1)
- End If
- End Sub
- Public Sub btnItem_Click(ByVal sender As Object, ByVal e As System.EventArgs)
- @#在這里編寫(xiě)控件數(shù)組對(duì)點(diǎn)擊事件的響應(yīng)
- @#例如:
- MsgBox("點(diǎn)擊:" & sender.GetType().ToString & CType(CType(sender, Button).Tag, String))
- End Sub
- End Class
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