图片上传判断width 等比例压缩

HttpPostedFile oFile = Request.Files["NewFile"];

// Check if the file has been correctly uploaded
if (oFile == null || oFile.ContentLength == 0 || !(Convert.ToInt32(HttpContext.GetGlobalResourceObject("SystemInfo", "OpenFileup")) == 1))
{
SendResults(202);
return;
}

int iErrorNumber = 0;
string sFileUrl = "";

// Get the uploaded file name.
string sFileName = System.IO.Path.GetFileName(oFile.FileName).Substring(System.IO.Path.GetFileName(oFile.FileName).LastIndexOf(".") + 1).ToLower();
string TypeName = HttpContext.GetGlobalResourceObject("SystemInfo", "UpfileTypeSettings").ToString();

if (!TypeName.Contains(sFileName) ||
oFile.ContentLength >= Convert.ToInt32(HttpContext.GetGlobalResourceObject("SystemInfo", "MaxFileLengthSettingsKB")) * 1024)
//文件类型判断 文件大小验证
{
SendResults(202);
return;
}

int iCounter = 0;

while (true)
{
//判断文件是否可以上传
if (CheckUploadFileExtension(sFileName))
{
string sFilePath = System.IO.Path.Combine(this.UserFilesDirectory, sFileName);

if (System.IO.File.Exists(sFilePath))
{
iCounter++;
sFileName =
System.IO.Path.GetFileNameWithoutExtension(oFile.FileName) +
"(" + iCounter + ")" +
System.IO.Path.GetExtension(oFile.FileName);

iErrorNumber = 201;
}
else
{
if (TypeName.Contains(".gif") || TypeName.Contains(".jpg") || TypeName.Contains("bmp") || TypeName.Contains("png"))
{
System.Drawing.Image image = System.Drawing.Image.FromStream(oFile.InputStream);

int width = image.Width;
int height = image.Height;

int max = Convert.ToInt32(HttpContext.GetGlobalResourceObject("SystemInfo", "ImageMaxWidth"));
if (width > max)
{
try
{
System.Drawing.Image newPic; //定义新位图对象
//String picPath = path + userID + time + fileExtension;
if (width > height)
{
newPic = new Bitmap(image, max, height * max / width); //缩放
}
else
{
newPic = new Bitmap(image, width * max / height, max); //缩放
}
newPic.Save(sFilePath, System.Drawing.Imaging.ImageFormat.Bmp); //将处理后的图片保存成bmp文件
sFileUrl = this.UserFilesPath + sFileName;
break;
}
catch
{
}
}
}

oFile.SaveAs(sFilePath);
sFileUrl = this.UserFilesPath + sFileName;
break;
}
}
else
{
//不允许上传
SendResults(202);
break;
}
}

SendResults(iErrorNumber, sFileUrl, sFileName);