如何使用控制数组获取 C# 中给定对象的数组索引？

发布于 2024-07-24 01:51:22 字数 571 浏览 9 评论 0原文

我正在向表单动态添加一堆控件。每个控件调用相同的方法，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，如果我单击 myCB[42] label1 将读取“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。

原文

I am dynamically adding a bunch of controls to a form. Each control calls the same method, and in that method I need to know the array index of the the control that performed the action.

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();
}

So if I click myCB[42] label1 will read "42" Of course, if there is an easier way to handle dynamic controls I'd appreciate pointers.

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辞旧 2024-07-31 01:51:22

private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
    label1.Text = Array.IndexOf(myCB, (CheckBox)sender).ToString();
}

private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
    label1.Text = Array.IndexOf(myCB, (CheckBox)sender).ToString();
}

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伴随着你 2024-07-31 01:51:22

控件应该有一个 Tag 属性。也许您可以将索引附加到标签上。不过你会招致拳击……

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攒眉千度 2024-07-31 01:51:22

int j = i;
myCB[i].Click += delegate(object sender, EventArgs e) {
 // here you can use "j"

};

int j = i;
myCB[i].Click += delegate(object sender, EventArgs e) {
 // here you can use "j"

};

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噩梦成真你也成魔 2024-07-31 01:51:22

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();
}

另一种替代方法是捕获事件处理程序中的信息，最简单地使用 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]);
}

或者对于更复杂的行为：（

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]);
}

在其中声明 DoSomethingComplicated适当）。

One obvious solution would be to set the tag:

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]);
}

Then:

private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
    Control control = (Control) sender;
    label1.Text = sender.Tag.ToString();
}

Another alternative is to capture the information in the event handler, most simply using a lambda expression or anonymous method:

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]);
}

or for more complicated behaviour:

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]);
}

(where you declare DoSomethingComplicated appropriately).

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