public void WriteFile (string file, object obj, MSBuildFileFormat format, bool saveProjects, IProgressMonitor monitor)
		{
			Solution sol = (Solution) obj;

			string tmpfilename = String.Empty;
			try {
				monitor.BeginTask (GettextCatalog.GetString ("Saving solution: {0}", file), 1);
				try {
					if (File.Exists (file))
						tmpfilename = Path.GetTempFileName ();
				} catch (IOException) {
				}

				string baseDir = Path.GetDirectoryName (file);
				if (tmpfilename == String.Empty) {
					WriteFileInternal (file, sol, baseDir, format, saveProjects, monitor);
				} else {
					WriteFileInternal (tmpfilename, sol, baseDir, format, saveProjects, monitor);
					FileService.SystemRename (tmpfilename, file);
				}
			} catch (Exception ex) {
				monitor.ReportError (GettextCatalog.GetString ("Could not save solution: {0}", file), ex);
				LoggingService.LogError (GettextCatalog.GetString ("Could not save solution: {0}", file), ex);

				if (!String.IsNullOrEmpty (tmpfilename) && File.Exists (tmpfilename))
					File.Delete (tmpfilename);
				throw;
			} finally {
				monitor.EndTask ();
			}
		}

		public bool CanReadFile (string file, MSBuildFileFormat format)
		{
			if (String.Compare (Path.GetExtension (file), ".sln", StringComparison.OrdinalIgnoreCase) == 0) {
				string tmp;
				string version = GetSlnFileVersion (file, out tmp);
				return format.SupportsSlnVersion (version);
			}
			return false;
		}

		public bool CanReadFile (string file, MSBuildFileFormat format)
		{
			if (String.Compare (Path.GetExtension (file), ".sln", true) == 0) {
				string tmp;
				string version = GetSlnFileVersion (file, out tmp);
				return version == format.SlnVersion;
			}
			return false;
		}

		public static SolutionEntityItem LoadItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string typeGuid, string itemGuid)
		{
			foreach (ItemTypeNode node in GetItemTypeNodes ()) {
				if (node.CanHandleFile (fileName, typeGuid))
					return node.LoadSolutionItem (monitor, fileName, expectedFormat, itemGuid);
			}
			
			if (string.IsNullOrEmpty (typeGuid) && IsProjectSubtypeFile (fileName)) {
				typeGuid = LoadProjectTypeGuids (fileName);
				foreach (ItemTypeNode node in GetItemTypeNodes ()) {
					if (node.CanHandleFile (fileName, typeGuid))
						return node.LoadSolutionItem (monitor, fileName, expectedFormat, itemGuid);
				}
			}

			return null;
		}

		public bool CanWriteFile (object obj, MSBuildFileFormat format)
		{
			return obj is Solution;
		}

		public string GetValidFormatName (object obj, string fileName, MSBuildFileFormat format)
		{
			return Path.ChangeExtension (fileName, ".sln");
		}

		void WriteFileInternal (string file, Solution solution, string baseDir, MSBuildFileFormat format, bool saveProjects, IProgressMonitor monitor)
		{
			SolutionFolder c = solution.RootFolder;
			
			using (StreamWriter sw = new StreamWriter (file, false, Encoding.UTF8)) {
				sw.NewLine = "\r\n";

				SlnData slnData = GetSlnData (c);
				if (slnData == null) {
					// If a non-msbuild project is being converted by just
					// changing the fileformat, then create the SlnData for it
					slnData = new SlnData ();
					c.ExtendedProperties [typeof (SlnFileFormat)] = slnData;
				}

				slnData.UpdateVersion (format);

				sw.WriteLine ();

				//Write Header
				sw.WriteLine ("Microsoft Visual Studio Solution File, Format Version " + slnData.VersionString);
				sw.WriteLine (slnData.HeaderComment);
				if (slnData.VisualStudioVersion != null)
					sw.WriteLine ("VisualStudioVersion = {0}", slnData.VisualStudioVersion);
				if (slnData.MinimumVisualStudioVersion != null)
					sw.WriteLine ("MinimumVisualStudioVersion = {0}", slnData.MinimumVisualStudioVersion);

				//Write the projects
				monitor.BeginTask (GettextCatalog.GetString ("Saving projects"), 1);
				WriteProjects (c, baseDir, sw, saveProjects, monitor);
				monitor.EndTask ();

				//Write the lines for unknownProjects
				foreach (string l in slnData.UnknownProjects)
					sw.WriteLine (l);

				//Write the Globals
				sw.WriteLine ("Global");

				//Write SolutionConfigurationPlatforms
				//FIXME: SolutionConfigurations?
				sw.WriteLine ("\tGlobalSection(SolutionConfigurationPlatforms) = preSolution");

				foreach (SolutionConfiguration config in solution.Configurations)
					sw.WriteLine ("\t\t{0} = {0}", ToSlnConfigurationId (config));

				sw.WriteLine ("\tEndGlobalSection");

				//Write ProjectConfigurationPlatforms
				sw.WriteLine ("\tGlobalSection(ProjectConfigurationPlatforms) = postSolution");

				List<string> list = new List<string> ();
				WriteProjectConfigurations (solution, list);

				list.Sort (StringComparer.Create (CultureInfo.InvariantCulture, true));
				foreach (string s in list)
					sw.WriteLine (s);

				//Write lines for projects we couldn't load
				if (slnData.SectionExtras.ContainsKey ("ProjectConfigurationPlatforms")) {
					foreach (string s in slnData.SectionExtras ["ProjectConfigurationPlatforms"])
						sw.WriteLine ("\t\t{0}", s);
				}

				sw.WriteLine ("\tEndGlobalSection");

				//Write Nested Projects
				ICollection<SolutionFolder> folders = solution.RootFolder.GetAllItems<SolutionFolder> ();
				if (folders.Count > 1) {
					// If folders ==1, that's the root folder
					sw.WriteLine ("\tGlobalSection(NestedProjects) = preSolution");
					foreach (SolutionFolder folder in folders) {
						if (folder.IsRoot)
							continue;
						WriteNestedProjects (folder, solution.RootFolder, sw);
					}
					sw.WriteLine ("\tEndGlobalSection");
				}
				
				//Write custom properties
				MSBuildSerializer ser = new MSBuildSerializer (solution.FileName);
				DataItem data = (DataItem) ser.Serialize (solution, typeof(Solution));
				if (data.HasItemData) {
					sw.WriteLine ("\tGlobalSection(MonoDevelopProperties) = preSolution");
					WriteDataItem (sw, data);
					sw.WriteLine ("\tEndGlobalSection");
				}
				
				// Write custom properties for configurations
				foreach (SolutionConfiguration conf in solution.Configurations) {
					data = (DataItem) ser.Serialize (conf);
					if (data.HasItemData) {
						sw.WriteLine ("\tGlobalSection(MonoDevelopProperties." + conf.Id + ") = preSolution");
						WriteDataItem (sw, data);
						sw.WriteLine ("\tEndGlobalSection");
					}
				}

				//Write 'others'
				if (slnData.GlobalExtra != null) {
//.........这里部分代码省略.........

		public override SolutionEntityItem LoadSolutionItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
		{
			MSBuildProjectHandler handler = new MSBuildProjectHandler (Guid, Import, itemGuid);
			return handler.Load (monitor, fileName, expectedFormat, null, null);
		}

		public override SolutionEntityItem LoadSolutionItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
		{
			MSBuildProjectHandler handler = CreateHandler<MSBuildProjectHandler> (fileName, itemGuid);
			return handler.Load (monitor, fileName, expectedFormat, null, ItemType);
		}

		internal void SetTargetFormat (MSBuildFileFormat targetFormat)
		{
			this.targetFormat = targetFormat;
		}

		//ExtendedProperties
		//	Per config
		//		Platform : Eg. Any CPU
		//		SolutionConfigurationPlatforms
		//
		SolutionFolder LoadSolution (Solution sol, string fileName, MSBuildFileFormat format, IProgressMonitor monitor)
		{
			string headerComment;
			string version = GetSlnFileVersion (fileName, out headerComment);

			ListDictionary globals = null;
			SolutionFolder folder = null;
			SlnData data = null;
			List<Section> projectSections = null;
			List<string> lines = null;
			
			FileFormat projectFormat = Services.ProjectService.FileFormats.GetFileFormat (format);

			monitor.BeginTask (GettextCatalog.GetString ("Loading solution: {0}", fileName), 1);
			//Parse the .sln file
			using (StreamReader reader = new StreamReader(fileName)) {
				sol.FileName = fileName;
				sol.ConvertToFormat (projectFormat, false);
				folder = sol.RootFolder;
				sol.Version = "0.1"; //FIXME:
				data = new SlnData ();
				folder.ExtendedProperties [typeof (SlnFileFormat)] = data;
				data.VersionString = version;
				data.HeaderComment = headerComment;

				string s = null;
				projectSections = new List<Section> ();
				lines = new List<string> ();
				globals = new ListDictionary ();
				//Parse
				while (reader.Peek () >= 0) {
					s = GetNextLine (reader, lines).Trim ();

					if (String.Compare (s, "Global", true) == 0) {
						ParseGlobal (reader, lines, globals);
						continue;
					}

					if (s.StartsWith ("Project")) {
						Section sec = new Section ();
						projectSections.Add (sec);

						sec.Start = lines.Count - 1;

						int e = ReadUntil ("EndProject", reader, lines);
						sec.Count = (e < 0) ? 1 : (e - sec.Start + 1);

						continue;
					}
				}
			}

			monitor.BeginTask("Loading projects ..", projectSections.Count + 1);
			Dictionary<string, SolutionItem> items = new Dictionary<string, SolutionItem> ();
			List<SolutionItem> sortedList = new List<SolutionItem> ();
			foreach (Section sec in projectSections) {
				monitor.Step (1);
				Match match = ProjectRegex.Match (lines [sec.Start]);
				if (!match.Success) {
					LoggingService.LogDebug (GettextCatalog.GetString (
						"Invalid Project definition on line number #{0} in file '{1}'. Ignoring.",
						sec.Start + 1,
						fileName));

					continue;
				}

				try {
					// Valid guid?
					new Guid (match.Groups [1].Value);
				} catch (FormatException) {
					//Use default guid as projectGuid
					LoggingService.LogDebug (GettextCatalog.GetString (
						"Invalid Project type guid '{0}' on line #{1}. Ignoring.",
						match.Groups [1].Value,
						sec.Start + 1));
					continue;
				}

				string projTypeGuid = match.Groups [1].Value.ToUpper ();
				string projectName = match.Groups [2].Value;
				string projectPath = match.Groups [3].Value;
				string projectGuid = match.Groups [4].Value;

				if (projTypeGuid == MSBuildProjectService.FolderTypeGuid) {
					//Solution folder
					SolutionFolder sfolder = new SolutionFolder ();
					sfolder.Name = projectName;
					MSBuildProjectService.InitializeItemHandler (sfolder);
					MSBuildProjectService.SetId (sfolder, projectGuid);

					List<string> projLines = lines.GetRange (sec.Start + 1, sec.Count - 2);
					DeserializeSolutionItem (sol, sfolder, projLines);
					
					foreach (string f in ReadFolderFiles (projLines))
//.........这里部分代码省略.........

		public void UpdateVersion (MSBuildFileFormat format)
		{
			VersionString = format.SlnVersion;
			headerComment = "# " + format.ProductDescription;
		}

		public override SolutionEntityItem LoadSolutionItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
		{
			MSBuildProjectHandler handler = CreateHandler<MSBuildProjectHandler> (fileName, itemGuid);
			handler.SetCustomResourceHandler (GetResourceHandler ());
			return handler.Load (monitor, fileName, expectedFormat, language, null);
		}

 public override SolutionEntityItem LoadSolutionItem(IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
 {
     return PackageJsonParser.ReadPackageInformation(new FilePath(fileName), monitor);
 }

		//Reader
		public object ReadFile (string fileName, MSBuildFileFormat format, IProgressMonitor monitor)
		{
			if (fileName == null || monitor == null)
				return null;

			Solution sol;
			try {
				ProjectExtensionUtil.BeginLoadOperation ();
				sol = new Solution ();
				monitor.BeginTask (string.Format (GettextCatalog.GetString ("Loading solution: {0}"), fileName), 1);
				var projectLoadMonitor = monitor as IProjectLoadProgressMonitor;
				if (projectLoadMonitor != null)
					projectLoadMonitor.CurrentSolution = sol;
				LoadSolution (sol, fileName, format, monitor);
			} catch (Exception ex) {
				monitor.ReportError (GettextCatalog.GetString ("Could not load solution: {0}", fileName), ex);
				throw;
			} finally {
				ProjectExtensionUtil.EndLoadOperation ();
				monitor.EndTask ();
			}
			return sol;
		}

		public override SolutionEntityItem LoadSolutionItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
		{
			return DubFileManager.Instance.LoadProject (fileName, Ide.IdeApp.Workspace.GetAllSolutions () [0], monitor);
		}

		//ExtendedProperties
		//	Per config
		//		Platform : Eg. Any CPU
		//		SolutionConfigurationPlatforms
		//
		SolutionFolder LoadSolution (Solution sol, string fileName, MSBuildFileFormat format, IProgressMonitor monitor)
		{
			string headerComment;
			string version = GetSlnFileVersion (fileName, out headerComment);

			ListDictionary globals = null;
			SolutionFolder folder = null;
			SlnData data = null;
			List<Section> projectSections = null;
			List<string> lines = null;
			
			FileFormat projectFormat = Services.ProjectService.FileFormats.GetFileFormat (format);

			monitor.BeginTask (GettextCatalog.GetString ("Loading solution: {0}", fileName), 1);
			//Parse the .sln file
			using (StreamReader reader = new StreamReader(fileName)) {
				sol.FileName = fileName;
				sol.ConvertToFormat (projectFormat, false);
				folder = sol.RootFolder;
				sol.Version = "0.1"; //FIXME:
				data = new SlnData ();
				folder.ExtendedProperties [typeof (SlnFileFormat)] = data;
				data.VersionString = version;
				data.HeaderComment = headerComment;

				string s = null;
				projectSections = new List<Section> ();
				lines = new List<string> ();
				globals = new ListDictionary ();
				//Parse
				while (reader.Peek () >= 0) {
					s = GetNextLine (reader, lines).Trim ();

					if (String.Compare (s, "Global", StringComparison.OrdinalIgnoreCase) == 0) {
						ParseGlobal (reader, lines, globals);
						continue;
					}

					if (s.StartsWith ("Project", StringComparison.Ordinal)) {
						Section sec = new Section ();
						projectSections.Add (sec);

						sec.Start = lines.Count - 1;

						int e = ReadUntil ("EndProject", reader, lines);
						sec.Count = (e < 0) ? 1 : (e - sec.Start + 1);

						continue;
					}

					if (s.StartsWith ("VisualStudioVersion = ", StringComparison.Ordinal)) {
						Version v;
						if (Version.TryParse (s.Substring ("VisualStudioVersion = ".Length), out v))
							data.VisualStudioVersion = v;
						else
							monitor.Log.WriteLine ("Ignoring unparseable VisualStudioVersion value in sln file");
					}

					if (s.StartsWith ("MinimumVisualStudioVersion = ", StringComparison.Ordinal)) {
						Version v;
						if (Version.TryParse (s.Substring ("MinimumVisualStudioVersion = ".Length), out v))
							data.MinimumVisualStudioVersion = v;
						else
							monitor.Log.WriteLine ("Ignoring unparseable MinimumVisualStudioVersion value in sln file");
					}
				}
			}

			monitor.BeginTask("Loading projects ..", projectSections.Count + 1);
			Dictionary<string, SolutionItem> items = new Dictionary<string, SolutionItem> ();
			List<SolutionItem> sortedList = new List<SolutionItem> ();
			foreach (Section sec in projectSections) {
				monitor.Step (1);
				Match match = ProjectRegex.Match (lines [sec.Start]);
				if (!match.Success) {
					LoggingService.LogDebug (GettextCatalog.GetString (
						"Invalid Project definition on line number #{0} in file '{1}'. Ignoring.",
						sec.Start + 1,
						fileName));

					continue;
				}

				try {
					// Valid guid?
					new Guid (match.Groups [1].Value);
				} catch (FormatException) {
					//Use default guid as projectGuid
					LoggingService.LogDebug (GettextCatalog.GetString (
						"Invalid Project type guid '{0}' on line #{1}. Ignoring.",
						match.Groups [1].Value,
						sec.Start + 1));
					continue;
				}

//.........这里部分代码省略.........

		public static SolutionEntityItem LoadItem (IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string typeGuid, string itemGuid)
		{
			foreach (ItemTypeNode node in GetItemTypeNodes ()) {
				if (node.CanHandleFile (fileName, typeGuid))
					return node.LoadSolutionItem (monitor, fileName, expectedFormat, itemGuid);
			}
			
			if (string.IsNullOrEmpty (typeGuid) && IsProjectSubtypeFile (fileName)) {
				typeGuid = LoadProjectTypeGuids (fileName);
				foreach (ItemTypeNode node in GetItemTypeNodes ()) {
					if (node.CanHandleFile (fileName, typeGuid))
						return node.LoadSolutionItem (monitor, fileName, expectedFormat, itemGuid);
				}
			}

			// If it is a known unsupported project, load it as UnknownProject
			var projectInfo = MSBuildProjectService.GetUnknownProjectTypeInfo (typeGuid != null ? new [] { typeGuid } : new string[0], fileName);
			if (projectInfo != null && projectInfo.LoadFiles) {
				if (typeGuid == null)
					typeGuid = projectInfo.Guid;
				var h = new MSBuildProjectHandler (typeGuid, "", itemGuid);
				h.SetUnsupportedType (projectInfo);
				return h.Load (monitor, fileName, expectedFormat, "", null);
			}

			return null;
		}

		internal virtual void SetSolutionFormat (MSBuildFileFormat format, bool converting)
		{
			SolutionFormat = format;
		}

 public override SolutionEntityItem LoadSolutionItem(IProgressMonitor monitor, string fileName, MSBuildFileFormat expectedFormat, string itemGuid)
 {
     throw new NotImplementedException ();
 }