Question

您好我想知道如何关注Form中的所有textboxes是否在其中任何一个都被更改了值。我看到了一些代码here

private void Form1_Load(object sender, EventArgs e)
{
    foreach (Control ctrl in this.Controls)
    {
        if (ctrl is TextBox)
        {
            TextBox tb = (TextBox)ctrl;
            tb.TextChanged += new EventHandler(tb_TextChanged);
        }
    }
}

void tb_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    tb.Tag = "CHANGED"; // or whatever
}

编写此代码的人说“无法将其分配给Panels和Grouboxes中的文本框”。

所以我的问题是因为我几乎每个文本框都在地图集或面板中，我怎样才能看到是否对面板或组合框中的文本框进行了更改？

Answer 1

您可以使您的方法递归：

private void Form1_Load(object sender, EventArgs e)
{
    Assign(this);
}

void Assign(Control control)
{
    foreach (Control ctrl in control.Controls)
    {
        if (ctrl is TextBox)
        {
            TextBox tb = (TextBox)ctrl;
            tb.TextChanged += new EventHandler(tb_TextChanged);
        }
        else
        {
            Assign(ctrl);
        }
    }
}

void tb_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    tb.Tag = "CHANGED"; // or whatever
}

只需找到该方法的更好名称，而不是Assign。

Answer 2

当你必须处理嵌套控件时，1 for循环无法帮助。你必须使用一些递归方法或自定义stack来遍历所有控件，如下所示：

private void RegisterTextChangedEventHandler(Control root){
   Stack<Control> stack = new Stack<Control>();
   stack.Push(root);  
   Control current = null;     
   while(stack.Count>0){
      current = stack.Pop();
      foreach(var c in current.Controls){
         if(c is TextBox) ((TextBox)c).TextChanged += textChanged;
         stack.Push(c);
      }
   }
}
private void textChanged(object sender, EventArgs e){
   //....
}
//Use it
RegisterTextChangedEventHandler(yourForm);//Or your container ....

Answer 3

您需要groupbox和panels的其他循环，您可以使用以下代码：

private void addEvents(Control.ControlCollection ct)
{
    foreach (Control ctrl in ct)
    {
        if (ctrl is TextBox)
        {
            TextBox tb = (TextBox)ctrl;
            tb.TextChanged += new EventHandler(tb_TextChanged);
        }
        else if (ctrl is GroupBox || ctrl is Panel) addEvents(ctrl.Controls);
    }
}

private void Form1_Load(object sender, EventArgs e)
{
    addEvents(this.Controls);
}

void tb_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    tb.Tag = "CHANGED"; // or whatever
}

将事件TextChanged分配给Form中的所有文本框

3 个答案: