關於collection的操作注意。

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

   寫了個程序，用來從一個panel中將我自己寫的user control移動到另外一個panel，如下

 

         private void MoveViewers(InfoList sourceList, InfoList targetList)

         {

              foreach (object viewer in sourceList.Controls)

              {

                   if (((InfoViewer) viewer).Checker.Checked)

                        targetList.Controls.Add((InfoViewer) viewer);

              }

         }

   

   誰知道，居然出錯，鬱悶，想了想，應該是Controls在變造成foreach找不到對象了。

   修改如下：

 

        

private void MoveViewers(InfoList sourceList, InfoList targetList)

         {

              Queue queqe = new Queue();

 

              foreach (object viewer in sourceList.Controls)

              {

                   if (((InfoViewer) viewer).Checker.Checked)

                       queqe.Enqueue(viewer);

              }

 

              while (queqe.Count != 0)

              {

                   targetList.Controls.Add((InfoViewer) queqe.Dequeue());

              }

         }

 

   BUG修復，已經好用了。

 

   感嘆，OOP一不小心，一個想當然的想法就會造成一個BUG，太恐怖了。