使用MainForm和Panel制作子表单 [英] Making SubForms with MainForm And a Panel

问题描述

根据此页

使用表格作为子表格 [ ^ ]



i完全按页面描述

，但处于两个子表单或更多子状态不工作



假设我有一个MenuStrip有两个toolStripMenuItem Page1和Page2

当我点击第1页时添加了一个subForm1但是当我点击Page2没有任何反应

，因为SubForm2组件位于SubForm1组件后面

我如何告诉小组丢弃SubForm1并仅包含SubForm2

这是代码

  private   void  page1ToolStripMenuItem_Click（ object  sender，EventArgs e） 
 {
 Subform SubForm =  new  Subform（）; 
 SubForm.FormBorderStyle = FormBorderStyle.None; 
 SubForm.TopLevel =  false ; 
 SubForm.ShowInTaskbar =  false ; 
 SubForm.Show（）; 
 SubForm.Dock = DockStyle.Fill; 
  this  .panel1.Controls.Add（SubForm）; 
} 
 
  private   void  page2ToolStripMenuItem_Click（ object  sender，EventArgs e）
 {
 subform1 SubForm =  new  subform1（）; 
 SubForm.FormBorderStyle = FormBorderStyle.None; 
 SubForm.TopLevel =  false ; 
 SubForm.ShowInTaskbar =  false ; 
 SubForm.Show（）; 
 SubForm.Dock = DockStyle.Fill; 
 此 .panel1 = 新 Panel（）; 
  this  .panel1.Controls.Add（SubForm）; 
} 
 

谢谢

解决方案

不，这不是你的代码所做的 - 你试图用你的Page2代码中的新版本替换现有的Panel：

 此 .panel1 =  new  Panel（）; 
  this  .panel1.Controls.Add（SubForm）; 

那不做什么但是你想要 - 因为旧的面板仍然在Form.Controls集合中，而不是新面板 - 所以永远不会显示新的子表单。

将代码更改为先清空旧面板：

 panel1.Controls.Clear（）; 
 panel1.Controls.Add（SubForm）; 

它应该都可以工作。



BTW：你不需要一直指定这个 - 只有在你的意思是同名的两个变量版本混淆时才需要它：

< pre lang =c＃> private string text = hello;
private string otherText = 12345;
private void 更改（ string text）
{
this .text = 再见 ; // 显式引用类级别变量
text + = there; // 隐式引用方法参数;
otherText = text; // 隐式引用类级别otherText和方法参数。
}

According to this Page
Use form as subform[^]

i do exactly what the page describes
but in the state of having two subforms or more it doesn't work

suppose i have a MenuStrip having two toolStripMenuItem Page1 and Page2
when i click Page 1 a subForm1 is added but when i click Page2 nothing happens
because the SubForm2 Components Lies behind SubForm1 Components
How can i tell the panel to discard SubForm1 and include only SubForm2
here is the code

private void page1ToolStripMenuItem_Click(object sender, EventArgs e)
      {
          Subform SubForm = new Subform();
          SubForm.FormBorderStyle = FormBorderStyle.None;
          SubForm.TopLevel = false;
          SubForm.ShowInTaskbar = false;
          SubForm.Show();
          SubForm.Dock = DockStyle.Fill;
          this.panel1.Controls.Add(SubForm);
      }

      private void page2ToolStripMenuItem_Click(object sender, EventArgs e)
      {
          subform1 SubForm = new subform1();
          SubForm.FormBorderStyle = FormBorderStyle.None;
          SubForm.TopLevel = false;
          SubForm.ShowInTaskbar = false;
          SubForm.Show();
          SubForm.Dock = DockStyle.Fill;
          this.panel1 = new Panel();
          this.panel1.Controls.Add(SubForm);
      }

Thanks

解决方案

No.,that isn't what your code is doing - you are trying to replace the existing Panel with a new version in your Page2 code:

this.panel1 = new Panel();
this.panel1.Controls.Add(SubForm);

That doesn't do what you want, however - because the old panel is still in the Form.Controls collection, not the new one - so the new subform1 is never displayed.
Change your code to just empty the old panel first:

panel1.Controls.Clear();
panel1.Controls.Add(SubForm);

And it should all work.

BTW: You don't need to specify this all the time - you only need it when there is confusion as to which version of two variables with the same name you mean:

private string text = "hello";
private string otherText = "12345";
private void change(string text)
   {
   this.text = "Goodbye";  // explicitly references the class level variable
   text += " there";       // implicitly references the method parameter;
   otherText = text;       // implicitly references class level otherText and method parameter.
   }

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