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如何：将数据发送到活动的 MDI 子窗体

  • 项目

通常，在多文档界面 (MDI) 应用程序的上下文中，你需要将数据发送到活动子窗口，例如在用户将数据从剪贴板粘贴到 MDI 应用程序中时。

注意

有关验证哪个子窗口具有焦点以及将其内容发送到剪贴板的信息，请参阅确定活动 MDI 子窗口。

将数据从剪贴板发送到活动 MDI 子窗口

  1. 在该方法中，将剪贴板上的文本复制到活动子窗体的活动控件。

    注意

    此示例假定有一个 MDI 父窗体 (Form1)，它具有一个或多个包含 RichTextBox 控件的 MDI 子窗口。 有关详细信息，请参阅创建 MDI 父窗体。

    Public Sub mniPaste_Click(ByVal sender As Object, _  
   ByVal e As System.EventArgs) Handles mniPaste.Click  

   ' Determine the active child form.  
   Dim activeChild As Form = Me.ParentForm.ActiveMDIChild  

   ' If there is an active child form, find the active control, which  
   ' in this example should be a RichTextBox.  
   If (Not activeChild Is Nothing) Then  
      Try  
         Dim theBox As RichTextBox = Ctype(activeChild.ActiveControl, RichTextBox)  
         If (Not theBox Is Nothing) Then  
            ' Create a new instance of the DataObject interface.  
            Dim data As IDataObject = Clipboard.GetDataObject()  
            ' If the data is text, then set the text of the
            ' RichTextBox to the text in the clipboard.  
            If (data.GetDataPresent(DataFormats.Text)) Then  
               theBox.SelectedText = data.GetData(DataFormats.Text).ToString()  
            End If  
         End If  
      Catch  
         MessageBox.Show("You need to select a RichTextBox.")  
      End Try  
   End If  
End Sub  

    protected void mniPaste_Click (object sender, System.EventArgs e)  
{  
  // Determine the active child form.  
   Form activeChild = this.ParentForm.ActiveMdiChild;  

   // If there is an active child form, find the active control, which  
   // in this example should be a RichTextBox.  
   if (activeChild != null)  
   {  
      try
      {  
         RichTextBox theBox = (RichTextBox)activeChild.ActiveControl;  
         if (theBox != null)  
         {  
            // Create a new instance of the DataObject interface.  
            IDataObject data = Clipboard.GetDataObject();  
            // If the data is text, then set the text of the
            // RichTextBox to the text in the clipboard.  
            if (data.GetDataPresent(DataFormats.Text))  
            {  
               theBox.SelectedText = data.GetData(DataFormats.Text).ToString();
            }  
         }  
      }  
      catch
      {  
         MessageBox.Show("You need to select a RichTextBox.");  
      }  
   }  
}

另请参阅