“IF you find an exception of Generic Error GDI+ .... then it means the folder is there, but the user (ASPNET or whatever user you are using) do not have write permissions on the folder。”这才明白，如果你的系统盘是NTFS格式的需要在WebCharts目录下添加aspnet的用户权限。我照着它的意思做了，哇成功了，太棒了。