WPF 自定义鼠标形状Cursor示例，并非从外界导入鼠标文件，而是自己用C#程序画一个鼠标形状，比如矩形，圆形或是多边形甚至组合图形。-WPF Custom Mouse Cursor shape example, the mouse does not import files from the outside, but their own C# program using the mouse to draw a shape, such as rectangular, circular or p