获取按钮所属的对象？ [英] Get what object a button belongs to?

问题描述

我会尽力缩短这个问题。如果我有以下课程：

I will try to shorten this question. If I have the following class:

public class MyClass<br />{<br />public int MyInt {get; set;}<br />public Button MyBtn {get; set;}<br />}

现在，假设我有一个for循环，它生成了这个类的几个对象，并将它连接到这样的事件处理程序：

Now, let's say I have a for-loop that generates several objects of this class and hooks it up to an event handler like this:

for (int i = 0; i < 5; i++)<br />            {<br />                MyClass myClass = new MyClass();<br />                myClass.MyInt = i;<br />                myClass.MyBtn = new Button();<br />                myClass.MyBtn.Click += (s, e) =><br />                {<br />                    //Is it possible to get the value of 'myClass.MyInt'<br />                    //in this event handler since 'myClass.MyBtn' belongs<br />                    //to the same object?<br />                };<br />            }

所以，我的问题是：单击按钮时是否可以获取'myClass.MyInt'的值？我的意思是，'myClass.MyBtn'和'myClass.MyInt'属于同一个对象。问题是我必须将所有按钮连接到同一个事件处理程序。

感谢您的帮助！

So, my question is: Is it possible to get the value of 'myClass.MyInt' when the button is clicked? I mean, 'myClass.MyBtn' and 'myClass.MyInt' belongs to the same object. The problem is that I must hook up all buttons to the same event handler.

Thanks for help!

推荐答案

您甚至不需要额外的类，您可以使用 myClass.MyBtn.Tag = myClass; 将MyClass引用存储在Button中，以便稍后事件处理程序可以将其发送者转换为Button转换为MyClass实例。 br>
:)

You don't even need an extra class, you could store the MyClass reference inside the Button using myClass.MyBtn.Tag=myClass; so later an event handler could convert its sender to Button to MyClass instance.

:)

嗯，是的，但有点奇怪：

Well, yes, but it's kind of weird:

private void Form1_Load(object sender, EventArgs e)
{
    for (int i = 0; i < 5; i++)
    {
        Button newButton = new Button
        {
            Text = "Button: " + i.ToString(),
            Location = new Point(i*80 + 50, 50),
            BackColor = Color.AliceBlue
        };

        MyClass myClass = new MyClass();
        myClass.MyInt = i;
        myClass.MyBtn = newButton;

        myClass.MyBtn.Click += (s, earg) =>
        {
            MyClass myclass = s as MyClass;

            MessageBox.Show(myClass.MyInt.ToString());
        };

        this.Controls.Add(newButton);
    }
}

如果你描述了你想要达到的目标，我或许可以提出一个更好的方法。

If you describe what you are trying to achieve, I may be able to suggest a better way.

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