C#实例开发，包含C#实例开发的相关代码，包括MapControl与PageLayoutControl、状态栏信息的添加与实现、图层符号选择器的实现-C# examples of the development, including C# examples of the development of the relevant code, including MapControl and PageLayoutControl, the status bar to add information and implementation, the implementation of the layer symbol selector, etc.