我正在为表单动态添加一堆控件。每个控件都调用相同的方法,在该方法中,我需要知道执行该操作的控件的数组索引。
CheckBox[] myCB = new CheckBox[100];
int i;
for (i = 0; i < 100; i++)
{
myCB[i] = new CheckBox();
myCB[i].Text = "Clicky!";
myCB[i].Click += new System.EventHandler(dynamicbutton_Click);
tableLayoutPanel1.Controls.Add(myCB[i]);
}
private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
label1.Text = sender.???array index property???.ToString();
}
因此,如果我点击myCB[42]
label1
将会读取“42”当然,如果有更简单的方法来处理动态控件,我会很感激指针。
答案 0 :(得分:5)
private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
label1.Text = Array.IndexOf(myCB, (CheckBox)sender).ToString();
}
答案 1 :(得分:3)
Control应该有Tag属性。也许你可以将索引附加到Tag。你会招致拳击......
答案 2 :(得分:3)
int j = i;
myCB[i].Click += delegate(object sender, EventArgs e) {
// here you can use "j"
};
答案 3 :(得分:2)
一个明显的解决方案是设置标签:
CheckBox[] myCB = new CheckBox[100];
for (int i = 0; i < myCB.Length; i++)
{
myCB[i] = new CheckBox();
myCB[i].Text = "Clicky!";
myCB[i].Click += new System.EventHandler(dynamicbutton_Click);
myCB[i].Tag = i;
tableLayoutPanel1.Controls.Add(myCB[i]);
}
然后:
private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
Control control = (Control) sender;
label1.Text = sender.Tag.ToString();
}
另一种方法是捕获事件处理程序中的信息,最简单的方法是使用lambda表达式或匿名方法:
CheckBox[] myCB = new CheckBox[100];
for (int i = 0; i < myCB.Length; i++)
{
int index = i; // This is very important, as otherwise i will
// be captured for all of them
myCB[i] = new CheckBox();
myCB[i].Text = "Clicky!";
myCB[i].Click += (s, e) => label1.Text = index.ToString();
tableLayoutPanel1.Controls.Add(myCB[i]);
}
或更复杂的行为:
CheckBox[] myCB = new CheckBox[100];
for (int i = 0; i < myCB.Length; i++)
{
int index= i; // This is very important, as otherwise i will
// be captured for all of them
myCB[i] = new CheckBox();
myCB[i].Text = "Clicky!";
myCB[i].Click += (s, e) => DoSomethingComplicated(index, s, e);
tableLayoutPanel1.Controls.Add(myCB[i]);
}
(适当地声明DoSomethingComplicated
)。