如何在C＃.NET在动态创建的按钮执行单击事件 [英] how to execute click event on dynamically created button in c#.net

问题描述

我想建立一个应用程序，在这里用户可以选择的类别，并根据它显示它的子类，这些子类别的按钮，这是动态创建的。

I am trying to build an app, where user can select category and according to it displays its sub categories , these sub categories are buttons, which are dynamically created.

现在，因为按钮是动态创建的，所以我混淆如何写button_click事件下的code，因为我不知道子究竟有多少。

Now, as buttons are dynamically created so I am confuse how to write code under button_click event as I dont know how many subcategories are there.

那么，有什么办法可以执行特定的按钮点击事件，这样我就可以执行某些命令？

So is there any way I can execute click event of a particular button , so that I can execute certain commands?

EDITED

这是code，我试图

Button btnDynamicButton = new Button();

private void btnclick_Click(object sender, EventArgs e)
{
label2.Text = btnDynamicButton.Text;
}
private void btnappetizer_Click(object sender, EventArgs e)
{
 groupBox2.Visible =false;
 DataTable dt = new DataTable();
 dt = itemmasterbl.SelectallrecordFromtblItem(btnappetizer.Text);
 for (int i = 0; i < dt.Rows.Count; i++)
 {
  string name = "Appetizer" + DynamicButtonCount;
  Button btnDynamicButton1 = new Button();
  btnDynamicButton1.Name = name;
  btnDynamicButton1.Text = name;
  btnDynamicButton1.Size =
  new System.Drawing.Size(150, 30);
  btnDynamicButton1.Location =
  new System.Drawing.Point(180, DynamicButtonCount * 30);
  btnDynamicButton1.Click +=new EventHandler(btnclick_Click);<br>
  Controls.Add(btnDynamicButton1);
  DynamicButtonCount++;
  btnDynamicButton = btnDynamicButton1;
  }
 }

一旦我做到这一点，根据下开胃在itemmaster DB值的数量创建三个按钮，但一旦我点击任何三个按钮标签只显示最后一个按钮的文本，因为在最后一行我有：

Once I do this it creates three buttons according to number of values in itemmaster DB under appetizer, but once I click on any of the three buttons the label displays only last buttons text,because in last line I have :

btnDynamicButton = btnDynamicButton1;

btnDynamicButton = btnDynamicButton1;

这将持续按钮的相关信息，而是我想这永远按钮I preSS，标签应显示相应文本。我怎样才能做到这一点。

Which will last buttons infos,but rather I want which ever button I press, label should display respective text. How can I achieve this.

推荐答案

您可以将所有的逻辑到一个处理程序：

you can put all your logic into one handler:

System.Windows.Forms.Button b = new System.Windows.Forms.Button();
b.Click += new EventHandler(b_Click);
//finally insert the button where it needs to be inserted.
...

void b_Click(object sender, EventArgs e)
{
    MessageBox.Show(((System.Windows.Forms.Button)sender).Name + " clicked");
}

要你的编辑：

您为您的字段 btnDynamicButton 内按钮（S）存储参考。因此，它总是被你所创建的最新按钮覆盖。你应该的不的使用领域引用按钮。点击处理程序的发件人参数包含已单击按钮元素。见code以上：简单的投发件人到按钮，你知道被点击了哪个按钮：

You are storing the reference for your button(s) inside the Field btnDynamicButton. Hence it always gets overwritten with the latest button you have created. You should not reference the button by using a field. The sender parameter of the click-handler contains the button element that has been clicked. See the code above: Simple cast sender to Button and you know which button has been clicked:

private void btnclick_Click(object sender, EventArgs e)
{
   Button btn = (Button)sender
   label2.Text = btn.Text;
}

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