CreateFileManager Class

public class CreateFileManager : FileManager

Public Class CreateFileManager
	Inherits FileManager

public ref class CreateFileManager : public FileManager

type CreateFileManager =  
    class
        inherit FileManager
    end

using System;
using System.IO;
using System.Text;
using System.Transactions;
using System.Xml;
using System.Xml.Linq;

namespace Novacta.Transactions.IO.CodeExamples
{
    /// <summary>
    /// Creates a file from an XML document.
    /// </summary>
    public class CreateXmlFileManager : CreateFileManager
    {
        XDocument xmlDocument;

        /// <summary>
        /// Initializes a new instance of the <see cref="CreateXmlFileManager"/> class.
        /// </summary>
        /// <param name="path">The path of the managed file.</param>
        /// <param name="xmlDocument">The XML document to save in the 
        /// managed file.</param>
        public CreateXmlFileManager(
            string path,
            XDocument xmlDocument) : base(path, overwrite: true)
        {
            this.xmlDocument = xmlDocument ??
                throw new ArgumentNullException(nameof(xmlDocument));
        }

        /// <summary>
        /// Called when the transaction is successfully committed.
        /// </summary>
        protected override void OnCommit()
        {
            var xmlTextWriter = new XmlTextWriter(this.ManagedFileStream, Encoding.UTF8);
            xmlTextWriter.Formatting = Formatting.Indented;
            this.xmlDocument.Save(this.ManagedFileStream);
        }
    }

    public class CreateFileManagerExample0  
    {
        public void Main()
        {
            // Define the XML document to be saved in case 
            // of a successfully committed transaction.
            var document = new XDocument();
            string content =
                "<?xml version='1.0' encoding='utf-8'?>" +
                "<items>" +
                    "<item>" +
                    "<id>0001</id>" +
                    "<description>A mysterious item</description>" +
                    "</item>" +
                "</items>";
            document = XDocument.Parse(content);

            // Define the path for the file to be managed.
            var managedPath = "create-file-0.xml";

            // Create the manager.
            var manager = new CreateXmlFileManager(
                managedPath,
                document);

            bool transactionSuccessfullyCommitted = true;

            try
            {
                // Create a TransactionScope to manage 
                // your resources, such as files or database
                // connections. In this way, it is guaranteed 
                // that the managing actions can commit or roll back 
                // as a single unit of work.
                using (TransactionScope scope = new TransactionScope())
                {
                    // Enlist the manager.
                    manager.EnlistVolatile(EnlistmentOptions.None);

                    // Add here additional resource managers,
                    // such as database connections, that need
                    // enlisting in the current transaction.

                    // The Complete method commits the transaction. 
                    // If an exception has been thrown, Complete 
                    // is not called and the transaction is rolled back.
                    scope.Complete();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Transaction aborted.");
                Console.WriteLine("Reason:");
                Console.WriteLine(e);
                transactionSuccessfullyCommitted = false;
            }
            finally
            {
                if (transactionSuccessfullyCommitted)
                {
                    Console.WriteLine("Transaction successfully committed.");
                }

                bool fileExists = File.Exists(managedPath);
                Console.WriteLine("File exists? {0}.", fileExists);
                if (fileExists)
                {
                    // We want to access the managed file to inspect its 
                    // content, hence we need to dispose 
                    // its manager.
                    manager.Dispose();

                    using (Stream stream = File.OpenRead(managedPath))
                    {
                        XDocument savedDocument = XDocument.Load(stream);

                        Console.WriteLine("File content:");
                        Console.WriteLine(savedDocument);
                    }
                }
            }
        }
    }
}

// Executing method Main() produces the following output:
// 
// Transaction successfully committed.
// File exists? True.
// File content:
// <items>
//   <item>
//     <id>0001</id>
//     <description>A mysterious item</description>
//   </item>
// </items>