public FileUploadStreamProvider(NameValueConfigurationSection configuration)
{
this._location = configuration["location"];
bool flag = this._location == null;
if (flag)
{
throw new ApplicationException();
}
bool flag2 = !Path.IsPathRooted(this._location);
if (flag2)
{
this._location = HttpContext.Current.Server.MapPath(this._location);
}
string text = configuration["existingAction"];
bool flag3 = text != null && text.Length != 0;
if (flag3)
{
this._existingAction = (FileUploadStreamProvider.ExistingAction)Enum.Parse(typeof(FileUploadStreamProvider.ExistingAction), text, true);
}
else
{
this._existingAction = FileUploadStreamProvider.ExistingAction.Exception;
}
string text2 = configuration["fileNameMethod"];
bool flag4 = text2 != null && text2.Length != 0;
if (flag4)
{
this._fileNameMethod = (FileUploadStreamProvider.FileNameMethod)Enum.Parse(typeof(FileUploadStreamProvider.FileNameMethod), text2, true);
}
else
{
this._fileNameMethod = FileUploadStreamProvider.FileNameMethod.Client;
}
bool flag5 = this._fileNameMethod == FileUploadStreamProvider.FileNameMethod.Custom;
if (flag5)
{
this._fileNameGenerator = (ConfigurationHashThread.CreateInstance(configuration["fileNameGenerator"], new object[]
{
configuration
}) as IFileNameGenerator);
bool flag6 = this._fileNameGenerator == null;
if (flag6)
{
throw new ApplicationException("无法对FileNameGenerator进行实例化.");
}
}
}
public Stream GetOutputStream(UploadedFile file)
{
FileUploadStreamProvider.FileNameMethod fileNameMethod = this._fileNameMethod;
string clientName;
if (fileNameMethod != FileUploadStreamProvider.FileNameMethod.Guid)
{
if (fileNameMethod != FileUploadStreamProvider.FileNameMethod.Custom)
{
clientName = file.ClientName;
}
else
{
clientName = this._fileNameGenerator.GenerateFileName(file);
bool flag = clientName.StartsWith("~");
if (flag)
{
clientName = HttpContext.Current.Server.MapPath(clientName);
}
}
}
else
{
clientName = Guid.NewGuid().ToString("n");
}
bool flag2 = !Path.IsPathRooted(clientName);
if (flag2)
{
clientName = Path.Combine(this._location, clientName);
}
string directoryName = Path.GetDirectoryName(clientName);
bool flag3 = !Directory.Exists(directoryName);
if (flag3)
{
Directory.CreateDirectory(directoryName);
}
file.LocationInfo["fileName"] = clientName;
Stream stream = null;
Stream stream2;
try
{
switch (this._existingAction)
{
case FileUploadStreamProvider.ExistingAction.Overwrite:
stream = new FileStream(clientName, FileMode.Create);
break;
case FileUploadStreamProvider.ExistingAction.Exception:
stream = new FileStream(clientName, FileMode.CreateNew);
break;
case FileUploadStreamProvider.ExistingAction.Rename:
{
string fileName = Path.GetFileName(clientName);
int index = fileName.IndexOf('.');
bool flag4 = index == -1;
string text4;
string text5;
if (flag4)
{
text4 = clientName;
text5 = string.Empty;
}
else
{
text4 = Path.Combine(Path.GetDirectoryName(clientName), fileName.Substring(0, index));
text5 = fileName.Substring(index);
}
int num2 = 0;
do
{
num2++;
clientName = string.Concat(new string[]
{
text4,
"[",
num2.ToString(),
"]",
text5
});
bool flag5 = !File.Exists(clientName);
if (flag5)
{
file.LocationInfo["fileName"] = clientName;
try
{
stream = new FileStream(clientName, FileMode.CreateNew);
}
catch
{
}
}
}while (stream == null);
break;
}
}
stream2 = stream;
}
catch
{
bool flag6 = stream != null;
if (flag6)
{
stream.Close();
this.RemoveOutput(file);
}
file.LocationInfo.Clear();
throw;
}
return(stream2);
}
