21

我在窗体的面板上动态生成了控件，并且还生成了一个用于删除控件的按钮，所有这些都成行。

int c = 0;
private void button1_Click(object sender, EventArgs e)
{
    int v;
    v = c++;
    panel1.VerticalScroll.Value = VerticalScroll.Minimum;
    ComboBox combo = new ComboBox();
    combo.Name = "combobox" + v ;
    combo.Location = new Point(30, 5 + (30 * v));

    ComboBox combo2 = new ComboBox();
    combo2.Name = "combobox2" + v ;
    combo2.Location = new Point(170, 5 + (30 * v));

    TextBox txt = new TextBox();
    txt.Name = "txtbx" + v;
    txt.Location = new Point(300, 5 + (30 * v));

    TextBox txt2 = new TextBox();
    txt2.Name = "txtbx2" + v;
    txt2.Location = new Point(450, 5 + (30 * v));

    TextBox txt3 = new TextBox();
    txt3.Name = "txtbx3" + v;
    txt3.Location = new Point(600, 5 + (30 * v));

    Button btn = new Button();
    btn.Name = "btn" + v;
    btn.Text = "Remove";
    btn.Location = new Point(750, 5 + (30 * v));
    panel1.Controls.Add(combo);
    panel1.Controls.Add(btn);
    panel1.Controls.Add(txt);
    panel1.Controls.Add(combo2);
    panel1.Controls.Add(txt2);
    panel1.Controls.Add(txt3);
    btn.Click += new EventHandler(btn_Click);
    combo.Tag = btn; 
    combo2.Tag = combo; 
    btn.Tag = combo2;

}

 private void btn_Click(object sender, EventArgs e)
 {
     ComboBox cb3 = btnh.Tag as ComboBox;
     ComboBox cb4 = cb3.Tag as ComboBox;
     panel1.Controls.Remove(cb3);
     panel1.Controls.Remove(cb4);
     panel1.Controls.Remove(btnh);
  }

现在如何在单击该行中的按钮时从该行中删除所有控件？

4

5 回答 5

43

您仍然没有说出要删除的控件、要删除的控件类型或要如何识别它们。

您可以通过控件循环删除特定控件。

如果你有Linq，它很容易：

private void btn_Click(object sender, EventArgs e)
{
    panel1.Controls.Clear(); //to remove all controls


    //to remove all comboboxes
    foreach (Control item in panel1.Controls.OfType<ComboBox>().ToList())
    {
        panel1.Controls.Remove(item); 
    }


   //to remove control by Name
    foreach (Control item in panel1.Controls.OfType<Control>().ToList())
    {
        if (item.Name == "bloodyControl")
            panel1.Controls.Remove(item); 
    }

    
    //to remove just one control, no Linq
    foreach (Control item in panel1.Controls)
    {
        if (item.Name == "bloodyControl")
        {
             panel1.Controls.Remove(item);
             break; //important step
        }
    }
}

编辑：

由于您已经标记了控件，因此很容易做同样的事情。您只需要从标签中检索控件即可。但是您需要适当地标记：

改为这样做：

private void button1_Click(object sender, EventArgs e)
{
    int v;
    v = c++;
    panel1.VerticalScroll.Value = VerticalScroll.Minimum;

    Button btn = new Button();
    btn.Name = "btn" + v;
    btn.Text = "Remove";
    btn.Location = new Point(750, 5 + (30 * v));
    btn.Click += new EventHandler(btn_Click);
    
    ComboBox combo = new ComboBox();
    combo.Name = "combobox" + v ;
    combo.Location = new Point(30, 5 + (30 * v));
    combo.Tag = btn;

    ComboBox combo2 = new ComboBox();
    combo2.Name = "combobox2" + v ;
    combo2.Location = new Point(170, 5 + (30 * v));
    combo2.Tag = btn;

    TextBox txt = new TextBox();
    txt.Name = "txtbx" + v;
    txt.Location = new Point(300, 5 + (30 * v));
    txt.Tag = btn;

    TextBox txt2 = new TextBox();
    txt2.Name = "txtbx2" + v;
    txt2.Location = new Point(450, 5 + (30 * v));
    txt2.Tag = btn;

    TextBox txt3 = new TextBox();
    txt3.Name = "txtbx3" + v;
    txt3.Location = new Point(600, 5 + (30 * v));
    txt3.Tag = btn;

    panel1.Controls.Add(combo);
    panel1.Controls.Add(btn);
    panel1.Controls.Add(txt);
    panel1.Controls.Add(combo2);
    panel1.Controls.Add(txt2);
    panel1.Controls.Add(txt3);    
}

private void btn_Click(object sender, EventArgs e)
{
   //to remove control by Name
    foreach (Control item in panel1.Controls.OfType<Control>().ToList())
    {
        if (item.Tag == sender || item == sender)
            panel1.Controls.Remove(item); 
    }
}

在这里，您使用按钮标记控件，因此在单击按钮时，您可以删除其标签是从sender参数中获得的单击按钮的所有控件。但是这种方法的缺点是您必须枚举面板的所有控件，这不是很好。

编辑：当我了解到以下代码是针对 OP 目前未使用的表格布局面板时。但无论如何，表格面板布局更适合这项工作。

我建议你这样做：

private void button1_Click(object sender, EventArgs e)
{
    int v;
    v = c++;
    panel1.VerticalScroll.Value = VerticalScroll.Minimum;

    Button btn = new Button();
    btn.Name = "btn" + v;
    btn.Text = "Remove";
    btn.Location = new Point(750, 5 + (30 * v));
    btn.Click += new EventHandler(btn_Click);
    btn.Tag = v;

    ComboBox combo = new ComboBox();
    combo.Name = "combobox" + v ;
    combo.Location = new Point(30, 5 + (30 * v));
    combo.Tag = v;

    ComboBox combo2 = new ComboBox();
    combo2.Name = "combobox2" + v ;
    combo2.Location = new Point(170, 5 + (30 * v));
    combo2.Tag = v;

    TextBox txt = new TextBox();
    txt.Name = "txtbx" + v;
    txt.Location = new Point(300, 5 + (30 * v));
    txt.Tag = v;

    TextBox txt2 = new TextBox();
    txt2.Name = "txtbx2" + v;
    txt2.Location = new Point(450, 5 + (30 * v));
    txt2.Tag = v;

    TextBox txt3 = new TextBox();
    txt3.Name = "txtbx3" + v;
    txt3.Location = new Point(600, 5 + (30 * v));
    txt3.Tag = v;

    panel1.Controls.Add(combo);
    panel1.Controls.Add(btn);
    panel1.Controls.Add(txt);
    panel1.Controls.Add(combo2);
    panel1.Controls.Add(txt2);
    panel1.Controls.Add(txt3);    
}

private void btn_Click(object sender, EventArgs e)
{
    int toBeDeletedRow = (int)((Control)sender).Tag;
    for (int row = panel1.RowCount - 1; row >= 0; row--)
    {
        if (row == toBeDeletedRow)
        {
            panel1.RowStyles.RemoveAt(row);
            panel1.RowCount--;
            return;
        }
    }
}
于 2012-12-15T02:29:33.297 回答
5

如果您有一个面板或其他包含更多动态组件的容器，用于删除所有或多个组件，您可以通过这种方式进行操作。

在第一步中，您将组件加载到数组或列表中。

List<PersonalUserControl> lst = new List<PersonalUserControl>();

foreach (Object obj in this.PanelImplementationTeam.Controls)
{     
    //DO NOT REMOVE COMPONENT IN THIS LOOP BECAUSE
    //YOU DECREASE THE .Controls  ARRAY AND YOU WILL HAVE AN ERROR      
    if (obj is PersonalUserControl)
    {
        lst.Add((PersonalUserControl)obj);
    }
}

foreach(PersonalUserControl uc in lst)
{
    uc.Dispose();
}
于 2015-10-12T13:52:00.397 回答
2

如果您要删除的所有控件都在面板中，您可以执行以下操作： panel.Controls.Clear(); 清除面板中的所有控件。

于 2018-01-16T03:51:33.483 回答
0

删除控制事件。来自 MSDN：

以编程方式从集合中删除控件

  1. 从事件中删除事件处理程序。在 Visual Basic 中，使用RemoveHandler 语句关键字；在 Visual C# 中，使用-= 运算符（C# 参考）。
  2. 使用Remove方法从面板的Controls集合中删除所需的控件。
  3. 调用Dispose方法释放控件使用的所有资源。

链接页面中使用VB和C#给出了具体示例。

于 2014-12-05T19:06:35.570 回答
0

由于控件是在运行时添加的，所以在使用findName方法之前注册它们register。

StackPanel sp = new StackPanel
{
   Name = "mySP",
   Orientation = Orientation.Horizontal,
};

//need to register the control to find it by name
RegisterName(sp.Name, sp);

//now to find control by name 
StackPanel sp = (StackPanel)mainStackPanel.FindName("mySP");

//deleting the control found
mainStackPanel.Children.Remove(sp);

//if you need to use the same name again, you have to unregister too
UnregisterName(sp.Name);
于 2020-09-22T13:05:30.457 回答