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      C# 事件处理程序委托中的闭包?

      时间:2023-11-11
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              • 本文介绍了C# 事件处理程序委托中的闭包?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                目前我来自函数式编程背景,如果我不了解 C# 中的闭包,请见谅.

                I am coming from a functional-programming background at the moment, so forgive me if I do not understand closures in C#.

                我有以下代码来动态生成获取匿名事件处理程序的按钮:

                I have the following code to dynamically generate Buttons that get anonymous event handlers:

                for (int i = 0; i < 7; i++)
                {
                    Button newButton = new Button();
                
                    newButton.Text = "Click me!";
                
                    newButton.Click += delegate(Object sender, EventArgs e)
                    {
                        MessageBox.Show("I am button number " + i);
                    };
                
                    this.Controls.Add(newButton);
                }
                

                我希望文本 "I am button number" + i 在 for 循环的迭代中以 i 的值关闭.但是,当我实际运行程序时,每个 Button 都会显示 I am button number 7.我错过了什么?我用的是VS2005.

                I expected the text "I am button number " + i to be closed with the value of i at that iteration of the for loop. However, when I actually run the program, every Button says I am button number 7. What am I missing? I am using VS2005.

                所以我想我的下一个问题是,我如何捕获价值?

                So I guess my next question is, how do I capture the value?

                推荐答案

                要获得这种行为,你需要将变量复制到本地,而不是使用迭代器:

                To get this behavior, you need to copy the variable locally, not use the iterator:

                for (int i = 0; i < 7; i++)
                {
                    var inneri = i;
                    Button newButton = new Button();
                    newButton.Text = "Click me!";
                    newButton.Click += delegate(Object sender, EventArgs e)
                    {
                        MessageBox.Show("I am button number " + inneri);
                    };
                    this.Controls.Add(newButton);
                }
                

                在这个问题中更详细地讨论了推理.

                The reasoning is discussed in much greater detail in this question.

                这篇关于C# 事件处理程序委托中的闭包?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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