[英]Error: Help D: System.IO.IOException: The process cannot access the file because it is being used by another process
[英]System.IO.IOException: The process cannot access the file being used by System.IO.__Error.WinIOError
问题:首先,我的“创建”控制器操作方法以两种不同的方式创建两个文件。 但是,我的程序无法删除使用file.SaveAs(path);创建的文件。 但是,我可以成功删除使用imgPhoto.Save(smallImageFilePath,System.Drawing.Imaging.ImageFormat.Jpeg)创建的其他文件;
这是我的Create控制器操作方法的HttpPost重载,包括ScaleByPercent方法调用:(完整的错误消息粘贴在底部)
[HttpPost]
[Authorize]
[ValidateAntiForgeryToken]
public ActionResult Create(HttpPostedFileBase file, Models.Gallery gallerycm)
{
ViewBag.Message = "Testing Gallery File Create";
if (file != null && file.ContentLength > 0)
try
{
string path = Path.Combine(Server.MapPath("~/Images/demo/gallery"),
Path.GetFileName(file.FileName));
//System.IO.File.SetAttributes(path, System.IO.FileAttributes.Normal);
//System.Drawing.Image MainImgPhotoVert = System.Drawing.Image.FromFile(path);
/*
System.Drawing.Image MainImgPhotoVert = System.Drawing.Image.FromStream(System.IO.Stream file);
Bitmap MainImgPhoto = (System.Drawing.Bitmap)ScaleByPercent(MainImgPhotoVert, 100);
MainImgPhoto.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);
MainImgPhoto.Dispose();
*/
file.SaveAs(path);
file.InputStream.Flush(); //useless
file.InputStream.Close(); //less than useless
file.InputStream.Dispose(); //complete waste of keystrokes
//System.IO.File.SetAttributes(path, System.IO.FileAttributes.Normal);
// Validating whether the following commented code releases a recently created
// file from IIS for file Delete. Problem occuring in the Visual Studio test environment.
//file.InputStream.Dispose();
//GC.Collect();
//GC.WaitForPendingFinalizers();
// Create the Thumbnail image
string smallImageFilePath = Path.Combine(Server.MapPath("~/Images/demo/gallery/") + "ThumbSize" + (file.FileName));
//allocate an Image object from the uploaded full sized .jpg
System.Drawing.Image imgPhotoVert = System.Drawing.Image.FromFile(path);
Bitmap imgPhoto = (System.Drawing.Bitmap)ScaleByPercent(imgPhotoVert, 50);
imgPhoto.Save(smallImageFilePath, System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
var gallery = new Gallery();
//gallery.PhotoNumberID = 9;
gallery.Filename = file.FileName;
if (gallerycm.PhotoDescription == null)
gallerycm.PhotoDescription = " ";
gallery.PhotoDescription = gallerycm.PhotoDescription;
var galleryContext = new EFDbGalleryContext();
galleryContext.Gallery.Add(gallery);
galleryContext.SaveChanges();
}
catch (Exception ex)
{
TempData["SomeData"] = file.FileName + " Upload exception. The Details follow: " + ex.ToString();
return RedirectToAction("Index");
}
else
{
ViewBag.Message = "You have not specified a file.";
}
TempData["SomeData"] = "Photo was successfully Added";
return RedirectToAction("Index");
}
static System.Drawing.Image ScaleByPercent(System.Drawing.Image imgPhoto, int Percent)
{
float nPercent = ((float)Percent / 100);
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap bmPhoto = new Bitmap(destWidth, destHeight,
System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);
Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.InterpolationMode =
System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
grPhoto.DrawImage(imgPhoto,
new Rectangle(destX, destY, destWidth, destHeight),
new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
GraphicsUnit.Pixel);
grPhoto.Dispose();
return bmPhoto;
}
}
这是我的Delete controller动作的摘录://从FileSystem删除大小文件
System.IO.File.Delete(smallImageFilePath);
//System.IO.File.GetAccessControl(largeImageFilePath);
try
{
System.IO.File.GetAccessControl(largeImageFilePath); // Does not help
System.IO.File.Delete(largeImageFilePath);
}
catch (System.IO.IOException e)
{
TempData["SomeData"] = " Delete exception. The Details follow: " + e.ToString();
return RedirectToAction("Index");
}
另请注意:如果我在VS Debug中暂停程序,则可以在Windows资源管理器中删除位图文件,但其他返回:
“”文件正在使用中“”无法完成操作,因为在IIS Worker进程中打开了文件。关闭文件,然后重试。 如果我关闭VS并返回,则可以删除它,但是当我在Godaddy服务器上部署所有内容时,这对我没有帮助。
这是总消息:删除异常。 详细信息如下:System.IO.IOException:该进程无法访问文件'C:\\ aspnet4_cs \\ Pettigoats \\ Pettigoats \\ Images \\ demo \\ gallery \\ WalkingOnPorch.jpg',因为该文件正在被另一个进程使用。 在System.IO.File.InternalDelete(字符串路径,布尔值CheckHost)在System.IO.File.Delete(字符串路径)在Pettigoats.Controllers.CMAdminController.Delete在System.IO.File.InternalDelete(字符串路径,布尔值CheckHost) (int32 id)在c:\\ aspnet4_cs \\ Pettigoats \\ Pettigoats \\ Controllers \\ CMAdminController.cs:第53行
GDI +对该文件设置了锁定,以获取更多信息GDI +图形
保存后的Dispose()可能会解决问题
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