Problem with Anonymous delegate in loop

TestForeachEventHandler.zip

   1: foreach (Test test in tests)

   2:             {

   3:                 Button button = new Button();

   4:                 button.Text = test.name;

   5:                 button.Click+=new EventHandler((object obj, EventArgs arg)=>{

   6:                     this.CreateTest(test);

   7:                 });

   8:                 this.flowLayoutPanel1.Controls.Add(button);

   9:             }

tests裏有2個元素，分別爲test1與test2, 程序會爲每個test新建一個button, 設爲button1,button2.
在button1的Click事件觸發的時候，調用CreateTestFlow方法時，傳遞的參數會是test2而不是test1.

原因：

WTF: "Problems" with Anonymous Delegates, LINQ, Lambdas within "foreach" or "for" Loops這篇文章裏的解釋爲：匿名委託裏的test是對循環變量引用，在循環結束時該變量爲最後個值，即’test2’.
如對foreach的理解相對困難的話，可以把foreach改爲for,代碼如下：

   1: for (int i=0;i<tests.Count;i++)

   2: {

   3:     Button button = new Button();

   4:     button.Text = tests[i].name;

   5:     button.Click+=new EventHandler((object obj, EventArgs arg)=>{

   6:         this.CreateTest(tests[i]);

   7:     });

   8:     this.flowLayoutPanel1.Controls.Add(button);

   9: }

則此代碼在運行時，會在第6行出現：ArgumentOutOfRangeException, Index was out of range.

解決方法：

在循環體裏新建一變量，用來保存循環過程中的值。代碼如下：

   1:  foreach (Test tes in tests)

   2:             {

   3:                 Test test = tes;

   4:                 Button button = new Button();

   5:                 button.Text = test.name;

   6:                 button.Click+=new EventHandler((object obj, EventArgs arg)=>{

   7:                     this.CreateTest(test);

   8:                 });

   9:                 this.flowLayoutPanel1.Controls.Add(button);

  10:             }