System.Drawing.Image image,newimage; 定义两个 image变量
image=System.Drawing.Image.FromFile(filePath); 给image变量赋值
System.Drawing.Image.GetThumbnaillmageAbort callb=null; 申明GetThumbnaillmageAbort
newimage= image.GetThumbnaillmage(67,90,callb,new System.IntPtr());对image进行缩放 缩放后放入newimage中