Class TempFileManager

Creates and manages a tempoary file ensuring that it is deleted when no longer required.

Inheritance

object

TempFileManager

Implements

IDisposable

Inherited Members

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

Namespace: SdlSdl.FileTypeSupportFramework

Assembly: Sdl.FileTypeSupport.Framework.Core.dll

Syntax

public class TempFileManager : IDisposable

Remarks

The temp file's file system readonly flag can also be set using ReadOnly and also the file can be locked using Locked to prevent it being deleted by the user or any disk space management software.

This class uses the FileJanitor class so it provides a convenient way to create and manage session-scope temporary files. Make sure that all objects needing access to the temp file have access to a corresponding TempFileManager object, that way when it is no longer referenced by any live objects and it gets garbage collected the temporary file is deleted.

The class also implements the IDisposable interface, and deletes the FileJanitor managed file in the Dispose() implementation.

If the file for some reason cannot be deleted no error is raised.

Note that the .NET Framework does not guarantee that finalizers will be called, so there is always a possibility that the file does not get deleted.

The TempFileManager class also has a static method AutoDeleteNonLockedFiles() that can be called during applicaiton startup to delete any temp files that may not have been deleted previously.

Constructors

TempFileManager()

Creates a temp file with a random name and manages it. See TempFileManager(string, bool) for more details.

Declaration

public TempFileManager()

TempFileManager(string)

Creates the named temp file in a random temp directory or named sub-directory and manages it. See TempFileManager(string, bool) for more details.

Declaration

public TempFileManager(string filePath)

Parameters

Type	Name	Description
string	filePath	A temp filename to create or empty for a random filename to be generated.

TempFileManager(string, bool)

Creates a temp file and manages it.

Declaration

public TempFileManager(string filePath, bool lockFile)

Parameters

Type	Name	Description
string	filePath	A temp filename to create or empty for a random filename to be generated.
bool	lockFile	If set to true the file is created in this constructor and locked with a read write stream available through LockedFileStream.

Remarks

If an empty file name is given then a random temp file is created. If only a file name is given then a temp folder is created and a file with the file name is created. If a full or partial path is given the then a temp folder with the last folder name in the path is created and a file with the file name is created within it.

Properties

CancelDelete

If true then this managed file is not deleted when this instance is disposed.

Declaration

public bool CancelDelete { get; set; }

Property Value

Type	Description
bool

DeleteDirectoryIfEmpty

If true a check will be made after the file has been deleted, and if no other files exist in the same directory that directory will also be deleted.

Declaration

public bool DeleteDirectoryIfEmpty { get; set; }

Property Value

Type	Description
bool

Deleted

If true then this managed file was sucessfully deleted.

Declaration

public bool Deleted { get; }

Property Value

Type	Description
bool

FilePath

Full path to the file to be deleted.

Declaration

public string FilePath { get; }

Property Value

Type	Description
string

FileProcess

Can be set to a running process' Process instance so that the managed temp file is deleted when the process exits.

Declaration

public Process FileProcess { get; set; }

Property Value

Type	Description
Process

Locked

Set to create (if it does not exist) and then to lock the temp file. The locked FileStream is available from LockedFileStream.

Declaration

public bool Locked { get; set; }

Property Value

Type	Description
bool

LockedFileStream

Returns the locked FileStream instace if the temp file was previously locked by setting Locked.

Declaration

public FileStream LockedFileStream { get; set; }

Property Value

Type	Description
FileStream

Remarks

The FileStream is opened for read/write access and share read access.

ReadOnly

If set to true the managed temp file's readonly file system flag is set.

Declaration

public bool ReadOnly { get; set; }

Property Value

Type	Description
bool

Remarks

The file must exist or be subsequently locked by setting Locked for this property to have any effect.

Methods

AutoDeleteNonLockedFiles()

Deletes all TempFileManager managed tempoary files and tempoary folders that could not be deleted previously.

Declaration

public static void AutoDeleteNonLockedFiles()

Remarks

This public static method is designed to be called when the using applicatin starts up so that all tempoary files that have been created by a previous invocation of the applicaion that could not be automatically delted can be deleted when the using application restarts.

This also employs a locking mechanism so that if two instances of the application are launched only the first instance will delete temp files that were left from a previous instance of the applicaiton.

Dispose()

Deletes the file, if it exists.

Declaration

public void Dispose()

Dispose(bool)

Implementation of the recommended dispose protocol. Deletes the file if possible.

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
bool	disposing	true if this method is called from IDisposable.Dispose() and false if called from Finalizer

~TempFileManager()

Deletes the file, if possible.

Declaration

protected ~TempFileManager()

TakeOverManagedFile(ref TempFileManager, TempFileManager)

This method handles the logic of handing over the management of a TempFileManager managed file to a new managed file

Declaration

public static void TakeOverManagedFile(ref TempFileManager managedFile, TempFileManager value)

Parameters

Type	Name	Description
TempFileManager	managedFile
TempFileManager	value

Implements

IDisposable