C# IGrouping类代码示例

        /// <summary>
        /// Generates a message saying that the constructor is ambiguous.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="bestDirectives">The best constructor directives.</param>
        /// <returns>The exception message.</returns>
        public static string ConstructorsAmbiguous(IContext context, IGrouping<int, ConstructorInjectionDirective> bestDirectives)
        {
            using (var sw = new StringWriter())
            {
                sw.WriteLine("Error activating {0} using {1}", context.Request.Service.Format(), context.Binding.Format(context));
                sw.WriteLine("Several constructors have the same priority. Please specify the constructor using ToConstructor syntax or add an Inject attribute.");
                sw.WriteLine();

                sw.WriteLine("Constructors:");
                foreach (var constructorInjectionDirective in bestDirectives)
                {
                    FormatConstructor(constructorInjectionDirective.Constructor, sw);
                }

                sw.WriteLine();

                sw.WriteLine("Activation path:");
                sw.WriteLine(context.Request.FormatActivationPath());

                sw.WriteLine("Suggestions:");
                sw.WriteLine("  1) Ensure that the implementation type has a public constructor.");
                sw.WriteLine("  2) If you have implemented the Singleton pattern, use a binding with InSingletonScope() instead.");

                return sw.ToString();
            }
        }

		/// <summary>
		/// Create a machine with the given SSAM Group
		/// </summary>
		/// <param name="machine"></param>
		public MachineEditorVm(IGrouping<Model.Machine, Model.StateStationActivityMachine> machine)
		{
			_group = machine;
			MachineId = machine.Key.Id;
			Name = machine.Key.Name;
			Code = machine.Key.Code;
		}

        /// <summary>
        /// Exports the masteries.
        /// </summary>
        /// <param name="typeMasteries">The type masteries.</param>
        /// <returns></returns>
        private static IEnumerable<SerializableMastery> ExportMasteries(IGrouping<int, DgmTypeMasteries> typeMasteries)
        {
            List<SerializableMastery> listOfMasteries = new List<SerializableMastery>();

            foreach (DgmMasteries typeMastery in typeMasteries.Select(x => Database.DgmMasteriesTable[x.MasteryID]))
            {
                Util.UpdatePercentDone(Database.MasteriesTotalCount);

                int grade = typeMastery.Grade + 1;

                SerializableMastery mastery;
                if (listOfMasteries.All(x=> x.Grade != grade))
                {
                    mastery = new SerializableMastery { Grade = grade };
                    listOfMasteries.Add(mastery);
                }
                else
                    mastery = listOfMasteries.First(x => x.Grade == grade);

                SerializableMasteryCertificate masteryCertificate = new SerializableMasteryCertificate
                {
                    ID = typeMastery.CertificateID,
                    ClassName =
                        Database.CrtClassesTable[Database.CrtCertificatesTable[typeMastery.CertificateID].ClassID].ClassName
                };

                mastery.Certificates.Add(masteryCertificate);
            }

            return listOfMasteries;
        }

 private static DeptWiseAttendanceDTO CreateAttendanceDTO(IGrouping<int, ActivityLogDTO> grp, IEnumerable<Employee> allEmployees)
 {
     var deptMembers = allEmployees.Where(e => e.Deprtment.Id == grp.First().Department.Id);
     var dto = new DeptWiseAttendanceDTO
     {
         DepartmentName = grp.First().Department.Name,
         Attendance = grp.GroupBy(gd => gd.Employee.Id)
                         .Select(empGroup => new AttendanceDTO
                         {
                             EmployeeName = empGroup.First().Employee.Name,
                             EmployeeId = empGroup.First().Employee.Id,
                             Attended = true,
                             Date = empGroup.First().TimeStamp.ToString("yyyy-MM-dd")
                         })
                         .ToList()
     };
     var absents = deptMembers.Where(m => !dto.Attendance.Any(a => a.EmployeeId == m.Id));
     var date = dto.Attendance.First().Date;
     dto.Attendance.AddRange(absents.Select(a => new AttendanceDTO
                         {
                             EmployeeName = a.Name,
                             EmployeeId = a.Id,
                             Attended = false,
                             Date = date
                         }));
     return dto;
 }

        private static IEnumerable<KeyValuePair<IndexedName, RealNode>> ReduceGroup(
			IEnumerable<KeyValuePair<IndexedName, RealNode>> aggr, IGrouping<XName, RealNode> items)
        {
            var addition = items.Select((elem, i) =>
                new KeyValuePair<IndexedName, RealNode>(new IndexedName(items.Key, i), elem));
            return aggr.Concat(addition);
        }

 public static PageRequest GetEventFromGroup(IGrouping<Guid, PageRequest> group)
 {
     var element = group.First();
     var other = group.Skip(1).ToList();
     if (other.Count == 0) return element;
     else return new RequestSessionGroup(element, other);
 }

		//internal TableInfo(DB2Connection connection, DB2DataReader reader)
		//{
		//	_connection = connection;

		//	Name = Convert.ToString(reader.GetValue(reader.GetOrdinal("NAME")));
		//	Remarks = Convert.ToString(reader.GetValue(reader.GetOrdinal("REMARKS")));
		//}

		internal TableInfo(IGrouping<string, DataRow> data)
		{
			_data = data;

			Name = data.First().Field<string>("TBNAME");
			Remarks = data.First().Field<string>("TBREMARKS");
		}

		/// <summary>
		/// Creates XML element containing the information on the specified pending changes group.
		/// </summary>
		public static XElement ExportPendingChangesGroup(IGrouping<IUserInfo, PendingChange> changesGroup)
		{
			return new XElement(
				"group",
				ExportUserInfo(changesGroup.Key),
				from change in changesGroup select ExportPendingChange(change));
		}

 public PackageFoundResult(IGrouping<string, IPackageInfo> packageInfos, PackageListOptions options, IEnumerable<IPackageInfo> currentPackages)
 {
     Options = options;
     CurrentPackages = currentPackages;
     Name = packageInfos.Key;
     Packages = packageInfos.ToList();
 }

 public static string FormatCanonicalizedValues(IGrouping<string, string> headerOrParameter)
 {
     return headerOrParameter.Key.ToLowerInvariant() + ":" +
         String.Join(",", headerOrParameter
             .Select(value => value.TrimStart().Replace("\r\n", String.Empty))
             .OrderBy(value => value, StringComparer.OrdinalIgnoreCase));
 }

 public GroupedOrderTagViewModel(Order selectedItem, IGrouping<string, OrderTagGroup> orderTagGroups)
 {
     Name = orderTagGroups.Key;
     OrderTags = orderTagGroups.Select(x => new GroupedOrderTagButtonViewModel(selectedItem, x)).ToList();
     ColumnCount = orderTagGroups.First().ColumnCount;
     ButtonHeight = orderTagGroups.First().ButtonHeight;
 }

 public ConvertEndsFacade(IGrouping<double, PanelBlRefExport> itemLefEndsByY, bool isLeftSide, ConvertPanelService cps)
 {
     this.itemLefEndsByY = itemLefEndsByY;
     this.sideName = isLeftSide ? "левый" : "правый";
     this.isLeftSide = isLeftSide;
     CPS = cps;
 }

 private static IEnumerable<IAutoCompleteListItem> parseClientGroup(IGrouping<ulong, Toggl.TogglAutocompleteView> c)
 {
     var projectItems = c.GroupBy(p => p.ProjectID).Select(parseProjectGroup);
     if (c.Key == 0)
         return projectItems;
     var clientName = c.First().ClientLabel;
     return new ClientCategory(clientName, projectItems.ToList()).Yield<IAutoCompleteListItem>();
 }

        private HtmlButtonGroup( HtmlForm form, IGrouping<string, IHtmlElement> inputGroup )
        {
            _form = form;

              name = inputGroup.Key;

              items = inputGroup.Select( e => new HtmlInputItem( this, e ) ).ToArray();
        }

        private ModuleRouteSummary CreateModuleRouteSummary(IGrouping<Type, RouteInfo> moduleRouteInfos)
        {
            var moduleRouteSummary = new ModuleRouteSummary(moduleRouteInfos.Key.Name, _helpModulePath);

            foreach (var routeInfo in moduleRouteInfos)
                moduleRouteSummary.Routes.Add(new RouteSummary(routeInfo, _helpModulePath));
            return moduleRouteSummary;
        }