二十六、实战图片框，计时器1、新建Windows窗体应用程序，取名ChangeBackground。2、拖放PictureBox、ImageList、Timer三个控件到窗体上，设置如下属性：控件                               属性                                            值PictureBox                     Name                                          picBackground                                      Dock                                           Fill                                      SizeMode                                   StretchImageImageList                      Name                                           imlBackground                                      ColorDepth                                 Depth16Bit                                      ImageSize                                    255,255Timer                            Name                                           Timer1                                     Enabled                                         True                                     Interval                                         10003、双击Timer控件的Tick事件，输入下面代码。if (index < imageList1.Images.Count - 1)            {                index++;            }            else            {                index = 0;            }            picBackground.Image = imageList1.Images[index];5、 在Form1类中定义全局变量int index = 0;6、 运行这个更换背景程序吧。

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