Question

我已动态向面板添加复选框。现在我怎样才能收到“你已经检查过1或2或3 ......”的警告信息。当复选框被选中？

CheckBox[] premiumticket = new CheckBox[50];
 private void Form1_Load(object sender, EventArgs e)
    {


     var panel1 = new Panel()
    {

        Size = new Size(600, 70),
        Location = new Point(20, 130),
        BorderStyle = BorderStyle.FixedSingle
    };




        for (int i = 0; i < 20; i++)
        {
           premiumticket[i]=new CheckBox();
           premiumticket[i].Text=(i+1).ToString();
           premiumticket[i].Name=(i+1).ToString();
           premiumticket[i].Location=new Point(x,y);
           panel1.Controls.Add(premiumticket[i]);

           x = x - 55;
           if (x < 55)
           {
               y = y + 20;
               x = 550;
           }
        }

        x = 550; y = 10;

        Controls.Add(panel1);  
   }

Answer 1

为每个CheckBox添加一个事件处理程序：

public void Checkbox_CheckedChanged(Object sender, EventArgs e) {
    CheckBox cb = (CheckBox)sender;

    MessageBox.Show( cb.Name + " was clicked!");
}

for (int i = 0; i < 20; i++) {
    premiumticket[i] = new CheckBox();
    premiumticket[i].OnCheckChanged += new EventHandler( Checkbox_CheckedChange );
    ...
}

Answer 2

为每个复选框动态创建事件并将警报代码放在其上

Answer 3

将此添加到您的for循环：

premiumticket[i].OnCheckChanged += new EventHandler( premiumTicketChanged );

复选框切换处理程序：

public void premiumTicketChanged (Object sender, EventArgs e)
{
    int ticketCount = premiumticket.Count(c => c.Checked);
    MessageBox.Show( string.Format("You have checked {0} checkboxes....", ticketCount));
}

Answer 4

 var checkBox = new CheckBox { ID = "WCCheckBox" + item.ItemID.ToString(), ItemID = item.ItemID, Checked = item.UserValue == "1", CssClass = "wounditem" };

您的实施可能是另一个。

Answer 5

动态添加控件后，您可以使用AddHandler来管理此控件的事件。请记住将复选框autopostback属性设置为true。

在Windows窗体中动态添加复选框

5 个答案: