Shulou(Shulou.com)06/03 Report--

This article will explain in detail the example analysis of Transactional File Manager, Xiaobian thinks it is quite practical, so share it with you as a reference, I hope you can gain something after reading this article.

Project Description

Transactional File Manager is a .NET API that supports including file system operations such as file copy, move, delete, append, etc. in a transaction. It's an implementation of System.Transaction.IEnlistmentNotification (works with System.Transactions.TransactionScope).

This library allows you to wrap file system operations in transactions like this:

// Wrap a file copy and a database insert in the same transactionTxFileManager fileMgr = new TxFileManager();using (TransactionScope scope1 = new TransactionScope()){// Copy a filefileMgr.Copy(srcFileName, destFileName);// Insert a database recorddbMgr.ExecuteNonQuery(insertSql);scope1.Complete();}Current Features

Support the following file operations in transactions:

AppendAllText

Copy

CreateDirectory

DeleteDirectory

DeleteFile

Move

Snapshot

WriteAllText

WriteAllBytes

This library supports any file system and is not a wrapper over Transactional NTFS (see AlphaFS).

Examples// Completely unrealistic example showing how various file operations, including operations done // by library/3rd party code, can participate in transactions.IFileManager fileManager = new TxFileManager();using (TransactionScope scope1 = new TransactionScope()){ fileManager.WriteAllText(inFileName, xml); // Snapshot allows any file operation to be part of our transaction. // All we need to know is the file name. //The statement below tells the TxFileManager to remember the state of this file. // So even though XslCompiledTransform has no knowledge of our TxFileManager, the file it creates (outFileName) // will still be restored to this state in the event of a rollback. fileManager.Snapshot(outFileName); XslCompiledTransform xsl = new XslCompiledTransform(true); xsl.Load(uri); xsl.Transform(inFileName, outFileName); // write to database 1. This database op will get committed/rolled back along with the file operations we are doing in this transaction. myDb1.ExecuteNonQuery(sql1); // write to database 2. The transaction is promoted to a distributed transaction here. myDb2.ExecuteNonQuery(sql2); // let's delete some files for (string fileName in filesToDelete) { fileManager.Delete(fileName); } // Just for kicks, let's start a new nested transaction. Since we specify RequiresNew here, this nested transaction // will be committed/rolled back separately from the main transaction. // Note that we can still use the same fileManager instance. It knows how to sort things out correctly. using (TransactionScope scope2 = new TransactionScope(TransactionScopeOptions.RequiresNew)) { fileManager.MoveFile(anotherFile, anotherFileDest); } // move some files for (string fileName in filesToMove) { fileManager.Move(fileName, GetNewFileName(fileName)); } // Finally, let's create a few temporary files... // disk space has to be used for something. // The nice thing about FileManager.GetTempFileName is that // The temp file will be cleaned up automatically for you when the TransactionScope completes. // No more worries about temp files that get left behind. for (int i=0; i

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