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TempFileCollection.cs
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TempFileCollection.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using System.IO;
// We keep this class in Common to allow utilizing it without taking a dependency on System.CodeDom
#if CODEDOM
namespace System.CodeDom.Compiler
#else
namespace System.IO.Internal
#endif
{
// Explicitly not [Serializable], so as to avoid accidentally deleting
// files specified in a serialized payload.
#if CODEDOM
public
#else
internal sealed
#endif
class TempFileCollection : ICollection, IDisposable
{
private string _basePath;
private readonly string _tempDir;
private readonly Hashtable _files;
private bool _createdTempDirectory;
public TempFileCollection() : this(null, false)
{
}
public TempFileCollection(string tempDir) : this(tempDir, false)
{
}
public TempFileCollection(string tempDir, bool keepFiles)
{
KeepFiles = keepFiles;
_tempDir = tempDir;
_files = new Hashtable(StringComparer.OrdinalIgnoreCase);
}
void IDisposable.Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
#pragma warning disable IDE0060
#if CODEDOM
protected virtual
#else
internal
#endif
void Dispose(bool disposing)
{
SafeDelete();
}
#pragma warning restore IDE0060
~TempFileCollection()
{
Dispose(false);
}
public string AddExtension(string fileExtension) => AddExtension(fileExtension, KeepFiles);
public string AddExtension(string fileExtension, bool keepFile)
{
if (string.IsNullOrEmpty(fileExtension))
{
throw new ArgumentException(SR.Format(SR.InvalidNullEmptyArgument, nameof(fileExtension)), nameof(fileExtension));
}
string fileName = BasePath + "." + fileExtension;
AddFile(fileName, keepFile);
return fileName;
}
public void AddFile(string fileName, bool keepFile)
{
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentException(SR.Format(SR.InvalidNullEmptyArgument, nameof(fileName)), nameof(fileName));
}
if (_files[fileName] != null)
{
throw new ArgumentException(SR.Format(SR.DuplicateFileName, fileName), nameof(fileName));
}
_files.Add(fileName, keepFile);
}
public IEnumerator GetEnumerator() => _files.Keys.GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() => _files.Keys.GetEnumerator();
void ICollection.CopyTo(Array array, int start) => _files.Keys.CopyTo(array, start);
public void CopyTo(string[] fileNames, int start) => _files.Keys.CopyTo(fileNames, start);
public int Count => _files.Count;
int ICollection.Count => _files.Count;
object ICollection.SyncRoot => null;
bool ICollection.IsSynchronized => false;
public string TempDir => _tempDir ?? string.Empty;
public string BasePath
{
get
{
EnsureTempNameCreated();
return _basePath;
}
}
private void EnsureTempNameCreated()
{
if (_basePath == null)
{
string tempFileName;
bool uniqueFile;
int retryCount = 5000;
do
{
_basePath = Path.Combine(
string.IsNullOrEmpty(TempDir) ? GetTempDirectory() : TempDir,
Path.GetFileNameWithoutExtension(Path.GetRandomFileName()));
tempFileName = _basePath + ".tmp";
try
{
new FileStream(tempFileName, FileMode.CreateNew, FileAccess.Write).Dispose();
uniqueFile = true;
}
catch (IOException ex)
{
retryCount--;
if (retryCount == 0 || ex is DirectoryNotFoundException)
{
throw;
}
uniqueFile = false;
}
} while (!uniqueFile);
_files.Add(tempFileName, KeepFiles);
}
}
#if NET7_0_OR_GREATER
private string GetTempDirectory()
{
_createdTempDirectory = true;
return Directory.CreateTempSubdirectory().FullName;
}
#else
private static string GetTempDirectory()
{
return Path.GetTempPath();
}
#endif
public bool KeepFiles { get; set; }
private bool KeepFile(string fileName)
{
object keep = _files[fileName];
return keep != null ? (bool)keep : false;
}
public void Delete()
{
SafeDelete();
}
private static void Delete(string fileName)
{
try
{
File.Delete(fileName);
}
catch
{
// Ignore all exceptions
}
}
internal void SafeDelete()
{
bool allFilesDeleted = true;
if (_files != null && _files.Count > 0)
{
string[] fileNames = new string[_files.Count];
_files.Keys.CopyTo(fileNames, 0);
foreach (string fileName in fileNames)
{
if (!KeepFile(fileName))
{
Delete(fileName);
_files.Remove(fileName);
}
else
{
allFilesDeleted = false;
}
}
}
// if we created a temp directory, delete it and clear the basePath, so a new directory will be created for the next request.
if (_createdTempDirectory && allFilesDeleted)
{
try
{
Directory.Delete(Path.GetDirectoryName(BasePath));
}
catch
{
// Ignore all exceptions
}
_createdTempDirectory = false;
_basePath = null;
}
}
}
}