下午,我正在尝试使用 asp.net FileUpload 控件上传文件。在保存图像之前,我需要使用用户 GUID 重命名文件,然后将图像大小调整为 128 像素。
但是,当它进行保存时,我收到错误GDI+ 中发生一般错误。我不知道如何排序。
有人可以查看我的代码并提供一些指导吗
protected void btnUpload_Click(object sender, EventArgs e)
{
Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey;
string directory = Server.MapPath("imgs/users");
string fileExt = Path.GetExtension(fuSample.PostedFile.FileName);
string fileName = userGuid + fileExt;
//Check File ext, make sure its an image!
if (fileExt == ".jpeg" || fileExt == ".jpg" || fileExt == ".png" || fileExt == ".gif")
{
//Now we check to make sure its less than 600kb
if (fuSample.PostedFile.ContentLength < 614400)
{
//Delete an existing file.
if (File.Exists(directory + fileName))
File.Delete(directory + fileName);
// Create a bitmap of the content of the fileUpload control in memory
Bitmap originalBMP = new Bitmap(fuSample.FileContent);
// Calculate the new image dimensions
int origWidth = originalBMP.Width;
int origHeight = originalBMP.Height;
int sngRatio = origWidth / origHeight;
int newWidth = 128;
int newHeight = newWidth / sngRatio;
// Create a new bitmap which will hold the previous resized bitmap
Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);
// Create a graphic based on the new bitmap
Graphics oGraphics = Graphics.FromImage(newBMP);
// Set the properties for the new graphic file
oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Draw the new graphic based on the resized bitmap
oGraphics.DrawImage(originalBMP, 0, 0, newWidth, newHeight);
// Save the new graphic file to the server
newBMP.Save(directory + fileName);
// Once finished with the bitmap objects, we deallocate them.
originalBMP.Dispose();
newBMP.Dispose();
oGraphics.Dispose();
//Success!
}
else
{
//error here, img too big
}
}
else
{
notifybar.Attributes.Add("style", "display:block;");
notifybar.Attributes.Add("class", "failed");
notifyText.Text = "Valid Image files only please! (.png, .jpg, .jpeg, or .gif)";
}
}