迭代C＃中复选框的控件

Question

I want to go through all the check boxes in form.tab and mark them as not selected. I found this was the right decision:

     foreach (Control c in this.Controls)
     {
         CheckBox cb = c as CheckBox;
         if (cb! = null & & cb.Checked)
         {
            cb.Checked = false;
         }
     }

But it does not work! And I do not understand why. I watched the debugger and cb is null . Why can this be? Where did I go wrong?

Answer 1

CheckBox可能包含在某个容器中，因此您必须进行一些递归查找或直接在此容器的Controls集合上进行迭代。

Answer 2

private void FindControls(Control Page)
{
     foreach (Control ctrl in this.Controls)
     {
          if (ctrl is CheckBox)
          {
              if (cb! = null & & cb.Checked)
              {                   
                   cb.Checked = false;                
              }
          }
          else 
          {
              if (ctrl.Controls.Count > 0)
              {
                   FindControls(ctrl);
              }
          }
     }
}

Answer 3

Try changing the first line from:

this.Controls

to

this.tab.Controls

Your current code is looping though the controls directly on the form. You need to loop through the controls on the tab.

Answer 4

我认为复选框控件的形式可能不是它们在其他容器中，例如“组”框或“面板”