C # solution for not integrating with the main form after the MDI subform is maximized

If the following figure is displayed:

After maximization:

Move to cover the menu bar:

You should know that after C # has maximized the child form, the title bar of the child form will be integrated with the menu bar of the parent form. After the child form is minimized, a small form is docked next to the status bar:

Cause:

The following statement is added to private void form1_load (Object sender, eventargs E:

Child. toplevel = false; child. parent = This; // this phenomenon is caused by these two sentences: child. startposition = formstartposition. manual; child. show (); child. focus ();

Solution: change the code above:

Child. windowstate = formwindowstate. Normal; child. mdiparent = This; // you must write this code. Otherwise, an error occurs. Child. Show (); Child. Focus ();

If the following error occurs:

An exception occurs when "the top-level control cannot be assigned to the control" is reported.

child.TopLevel = false; 

This Code, resulting in this phenomenon.

After solving these problems, the correct effect is:

If the following conditions occur:

Solution: add the itemadded event handler function of the menustrip1 control of the main form. The Code is as follows:

 private void menuStrip1_ItemAdded(object sender, ToolStripItemEventArgs e)   {        if (e.Item.Text.Length == 0 )        {              e.Item.Visible = false;         }  }