上传图片并修改其大小(C#)的方法

上传图片并修改其大小

//thefile是一个File Field HTML 控件

thefile.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath("temp.png"));

MemoryStream MemStream=new MemoryStream();

System.Drawing.Image imgOutput =System.Drawing.Bitmap.FromFile(System.Web.HttpContext.Current.Server.MapPath("temp.png"));

//修改成80×80大小

System.Drawing.Image imgOutput2=imgOutput.GetThumbnailImage(80,80,null,IntPtr.Zero);

imgOutput2.Save(System.Web.HttpContext.Current.Server.MapPath("image.png"), ImageFormat.Png);

Response.Write(thefile.PostedFile.FileName);

Response.Write("Len:"+MemStream.Length.ToString());

imgOutput.Dispose();

imgOutput2.Dispose();

Response.Write("上传成功!");

Response.Write(System.Web.HttpContext.Current.Server.MapPath("image.png"));