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有多处代码访问同一窗体,保持原窗体不变.

(2007-11-09 20:42:04)
标签：

IT/科技

窗体
 如果在项目中有多处代码访问同一窗体，则你必须把它的同一实例指针传递给这些代码，否则新创建的窗体实例就不再是原先的窗体了。

下面的代码实现窗体Form1和Form2之间互相调用,Form1为主窗体。Form1上的按钮BtnShowFrm2的标题为“显示Form2”，Form2上的按钮BtnShowFrm1的标题为“显示Form1”。

1、Form1中的代码：

http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gifPublic Class Form1
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif    Inherits System.Windows.Forms.Form
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif    '创建Form2的一个新的实例
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif    Dim Frm2 As New Form2()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif    Public Function Instance2(ByVal frm As Form2)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Frm2 = frm
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif    End Function
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif    Private Sub BtnShowFrm2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Handles BtnShowFrm2.Click
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        '以下语句保证在Form2以及其他窗体中访问Form1时，
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        '都将得到Form1的同一个窗体实例。
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Frm2.Instance(Me)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Frm2.Show()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Me.Hide()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif    End Sub
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gifEnd Class
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
2、Form2中的代码：
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gifPublic Class Form2
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　Inherits System.Windows.Forms.Form
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　Dim frm1 As Form1
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　'借助一个新增的Instance属性来生成窗体frm1的实例
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif　Public Function Instance(ByVal frm As Form1)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　frm1 = frm
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif　End Function
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif　Private Sub BtnShowFrm1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif        Handles BtnShowFrm1.Click
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　Me.Hide()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　frm1.Show()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif　End Sub
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif　Private Sub Form2_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　'如果Form2被关闭，则设置Form1的按钮BtnShowFrm2不可用。
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　frm1.BtnShowFrm2.Enabled = False
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif　　frm1.Show()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif　End Sub
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gifEnd Class
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif 

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