C# 动态打开图像，并缩放图像，放大和缩小，可打开的图像格式有：JPG/JPEG/BMP/GIF/PNG，还有更多格式 图像的缩放是按比例进行的，可以不考虑图像变形，但是一味的放大会使图像失真，变得不清淅。-C# dynamic open the image and zoom the image, zoom in and out, you can open the image formats: JPG/JPEG/BMP/GIF/PNG, and many more formats　the image is scaled proportionally, you can not consider the image distortion but blindly zoom makes the image distortion becomes clear mission.