C# OrderBy类代码示例

 /// <summary>
 /// Default constructor
 /// </summary>
 public QueryData()
 {
     fields = new List<string>();
     conditions = new List<string>();
     groupBy = new GroupBy();
     orderBy = new OrderBy();
 }

 public static string GetParametersString(int page, SortBy sort, OrderBy direction)
 {
     return string.Format("page={0}&sort={1}&direction={2}",
                          page,
                          sort.GetText(),
                          direction.GetText());
 }

 public OrderByService RegisterButton(LinkButton button, OrderBy orderBy)
 {
     button.Click += delegate { ButtonClicked(orderBy); };
     SetCssClass(button, orderBy);
     Changed += delegate { SetCssClass(button, orderBy); };
     return this;
 }

 public ActionResult ClassAdvanced(string searchString, int page, SearchBy searchBy, OrderBy orderBy, string universityId)
 {
     UserInformationModel<User> myUserInformation = GetUserInformatonModel();
     searchString = MassageSearchString(searchString);
     SearchResultsModel mySearchResults = theSearchService.GetClassSearchResults(myUserInformation, searchString, page, searchBy, orderBy, universityId);
     return View("Results", mySearchResults);
 }

 public SearchPage(List<LaunchData> launchList, OrderBy order)
 {
     Title = "Launch list";
     Context = new SearchViewModel(launchList, order);
     Context.SearchResult.ItemTapped += SearchResult_ItemTapped;
     BackgroundColor = Theme.BackgroundColor;
     Content = GenerateView();
 }

 public static XContainer ReorderElements(this XContainer root, OrderBy reorderElementsBy)
 {
     if (reorderElementsBy.HasFlag(OrderBy.MinX)) OrderByMinX(root);
     if (reorderElementsBy.HasFlag(OrderBy.MinY)) OrderByMinY(root);
     if (reorderElementsBy.HasFlag(OrderBy.ChildMinY)) OrderByChildMinY(root);
     if (reorderElementsBy.HasFlag(OrderBy.Id)) OrderById(root);
     else if (reorderElementsBy.HasFlag(OrderBy.IdDesc)) OrderByIdDesc(root);
     return root;
 }

 public MessageOrderBy()
 {
     Id = new OrderBy("Id", this);
     From = new OrderBy("FromType", this);
     To = new OrderBy("ToType", this);
     Type = new OrderBy("Type", this);
     Status = new OrderBy("Status", this);
     DateCreated = new OrderBy("DateCreated", this);
 }

 private static string OrderByToString(OrderBy orderBy)
 {
     switch (orderBy)
     {
         case OrderBy.CreateDate:
             return "create_date";
         case OrderBy.RuReleaseDate:
             return "ru_releae_date";
         default:
             return "release_date";
     }
 }

 public virtual SqlStatement GetGroupBySumStatement(Condition iwc, OrderBy order, string groupbyColumnName, string sumColumnName)
 {
     var builder = new SelectStatementBuilder(Context.Info.From, order, null);
     builder.Where.Conditions = iwc;
     var list = groupbyColumnName.Split(',');
     foreach (string s in list)
     {
         builder.Keys.Add(new KeyValuePair<string, string>(s, null));
         builder.SetAsGroupBySum(groupbyColumnName, sumColumnName);
     }
     return builder.ToSqlStatement(Context);
 }

 public static string GetMovieListUrl(DateTime fromDate, DateTime toDate, OrderBy orderBy, bool ascOrder, int pageNumber, int itemsPerPage, string genre, string country)
 {
     var sb = new StringBuilder(string.Format("&from={0}&to={1}&order_by={2}&order={3}&page={4}&per_page={5}", fromDate, toDate, OrderByToString(orderBy), ascOrder ? "asc" : "desc", pageNumber, itemsPerPage));
     if (!string.IsNullOrEmpty(genre))
     {
         sb.Append(string.Format("&genre={0}", genre));
     }
     if (!string.IsNullOrEmpty(country))
     {
         sb.Append(string.Format("&country={0}", country));
     }
     return ConcatBase(Settings.Default.MovieListUrlPart, sb);
 }

        public RestAPIResponse Get(string id = null, string hash = null, string historicsId = null, int? page = null, int? perPage = null, OrderBy? orderBy = null, OrderDirection? orderDirection = null, bool? includeFinished = null)
        {
            //Contract.Requires<ArgumentException>((id != null) ? id.Trim().Length > 0 : true);
            //Contract.Requires<ArgumentException>((id != null) ? Constants.SUBSCRIPTION_ID_FORMAT.IsMatch(id) : true, Messages.INVALID_SUBSCRIPTION_ID);
            //Contract.Requires<ArgumentException>((hash != null) ? hash.Trim().Length > 0 : true);
            //Contract.Requires<ArgumentException>((hash != null) ? Constants.STREAM_HASH_FORMAT.IsMatch(hash) : true, Messages.INVALID_STREAM_HASH);
            //Contract.Requires<ArgumentException>((historicsId != null) ? historicsId.Trim().Length > 0 : true);
            //Contract.Requires<ArgumentException>((historicsId != null) ? Constants.HISTORICS_ID_FORMAT.IsMatch(historicsId) : true, Messages.INVALID_HISTORICS_ID);
            //Contract.Requires<ArgumentException>((page.HasValue) ? page.Value > 0 : true);
            //Contract.Requires<ArgumentException>((perPage.HasValue) ? perPage.Value > 0 : true);

            return _client.GetRequest().Request("push/get", new { id = id, hash = hash, historics_id = historicsId, page = page, per_page = perPage, order_by = orderBy, order_dir = orderDirection, include_finished = includeFinished });
        }

 //Возвращает текущий список
 //Задаем сортировку/порядок/отмену
 public List<Item> Down(string iD, OrderBy op)
 {
     switch (op)
     {
         case OrderBy.None:
             CurrentNode.Push(_treeMenu.Find(z => z.Id == iD).Children
                 .Select(p => new Item { ItemLine = p.Value.ItemLine, Id = p.Value.Id }).ToList());
             break;
             case OrderBy.Orderby:
             CurrentNode.Push(_treeMenu.Find(z => z.Id == iD).Children.OrderBy(z => z.Value.ItemLine.ElementAt(2))
                .Select(p => new Item { ItemLine = p.Value.ItemLine, Id = p.Value.Id }).ToList());
             break;
         case OrderBy.Descending:
             CurrentNode.Push(_treeMenu.Find(z => z.Id == iD).Children.OrderByDescending(z => z.Value.ItemLine.ElementAt(2))
                 .Select(p => new Item { ItemLine = p.Value.ItemLine, Id = p.Value.Id }).ToList());
             break;
     }
     var c = CurrentNode.Count;
     return CurrentNode.Peek();
 }

        //--------------------
        public bool CreateDimensionAttributeForLevel(Dimension dimension, DataSourceView dataSourceView,
            String levelId, String levelName, String tableName, String keyColumn, String nameColumn,
            AttributeUsage attributeUsage, OrderBy orderBy, AttributeType attribType, bool visible)
        {
            if (dimension.Attributes == null)
            {
                return false;
            }

            DimensionAttribute dimAttrib;
            if (!dimension.Attributes.Contains(levelId))
            {
                dimAttrib = dimension.Attributes.Add(levelName, levelId);
                dimAttrib.Usage = attributeUsage;
                dimAttrib.OrderBy = orderBy;
                dimAttrib.Type = attribType;
                dimAttrib.AttributeHierarchyVisible = true;// visible;
                dimAttrib.AttributeHierarchyOptimizedState = OptimizationType.NotOptimized;
                dimAttrib.AttributeHierarchyOrdered = true;
                dimAttrib.IsAggregatable = true;
                //设置MembersWithDataCaption会导致当前粒度在子粒度中存在，形如"XXXX(All)"，因此注释掉
                //if (attributeUsage == AttributeUsage.Parent)
                //{
                //    dimAttrib.MembersWithDataCaption = "*(All)";
                //}
                dimAttrib.MembersWithData = MembersWithData.NonLeafDataHidden;

                DataItem diKey = CreateDataItem(dataSourceView, tableName, keyColumn);
                dimAttrib.KeyColumns.Add(diKey);
                if (!String.IsNullOrEmpty(nameColumn))
                {
                    DataItem diName = CreateDataItem(dataSourceView, tableName, nameColumn);
                    dimAttrib.NameColumn = diName;

                    DataItem diValue = CreateDataItem(dataSourceView, tableName, nameColumn);
                    dimAttrib.ValueColumn = diValue;
                }
                return true;
            }
            return true;
        }

        public List<Folder> GetFolders(object parentId, OrderBy orderBy, FilterType filterType, Guid subjectID, string searchText)
        {
            var folders = GetFolders(parentId).AsEnumerable(); //TODO:!!!
            //Filter
            switch (filterType)
            {
                case FilterType.ByUser:
                    folders = folders.Where(x => x.CreateBy == subjectID);
                    break;

                case FilterType.ByDepartment:
                    folders = folders.Where(x => CoreContext.UserManager.IsUserInGroup(x.CreateBy, subjectID));
                    break;
            }

            if (!string.IsNullOrEmpty(searchText))
                folders = folders.Where(x => x.Title.IndexOf(searchText, StringComparison.OrdinalIgnoreCase) != -1);

            if (orderBy == null) orderBy = new OrderBy(SortedByType.DateAndTime, false);

            switch (orderBy.SortedBy)
            {
                case SortedByType.Author:
                    folders = orderBy.IsAsc ? folders.OrderBy(x => x.CreateBy) : folders.OrderByDescending(x => x.CreateBy);
                    break;
                case SortedByType.AZ:
                    folders = orderBy.IsAsc ? folders.OrderBy(x => x.Title) : folders.OrderByDescending(x => x.Title);
                    break;
                case SortedByType.DateAndTime:
                    folders = orderBy.IsAsc ? folders.OrderBy(x => x.CreateOn) : folders.OrderByDescending(x => x.CreateOn);
                    break;
                default:
                    folders = orderBy.IsAsc ? folders.OrderBy(x => x.Title) : folders.OrderByDescending(x => x.Title);
                    break;
            }

            return folders.ToList();
        }

        // Fill the UOMID list.
        protected virtual void PopulateUOMIDDropDownList(string selectedValue, int maxItems)
        {
            this.UOMID.Items.Clear();

            // 1. Setup the static list items

            // Add the Please Select item.
            this.UOMID.Items.Insert(0, new ListItem(this.Page.GetResourceValue("Txt:PleaseSelect", "FPCEstimate"), "--PLEASE_SELECT--"));

            // 2. Set up the WHERE and the ORDER BY clause by calling the CreateWhereClause_UOMIDDropDownList function.
            // It is better to customize the where clause there.

            WhereClause wc = CreateWhereClause_UOMIDDropDownList();

            // Create the ORDER BY clause to sort based on the displayed value.

            OrderBy orderBy = new OrderBy(false, false);
                          orderBy.Add(UOMTable.UOMName, OrderByItem.OrderDir.Asc);

            System.Collections.Generic.IDictionary<string, object> variables = new System.Collections.Generic.Dictionary<string, object> ();

            // 3. Read a total of maxItems from the database and insert them into the UOMIDDropDownList.
            UOMRecord[] itemValues  = null;
            if (wc.RunQuery)
            {
                int counter = 0;
                int pageNum = 0;
                FormulaEvaluator evaluator = new FormulaEvaluator();
                do
                {
                    itemValues = UOMTable.GetRecords(wc, orderBy, pageNum, maxItems);
                    foreach (UOMRecord itemValue in itemValues)
                    {
                        // Create the item and add to the list.
                        string cvalue = null;
                        string fvalue = null;
                        if (itemValue.UOMIDSpecified)
                        {
                            cvalue = itemValue.UOMID.ToString().ToString();
                            if (counter < maxItems && this.UOMID.Items.FindByValue(cvalue) == null)
                            {

                                Boolean _isExpandableNonCompositeForeignKey = ScopeTable.Instance.TableDefinition.IsExpandableNonCompositeForeignKey(ScopeTable.UOMID);
                                if(_isExpandableNonCompositeForeignKey && ScopeTable.UOMID.IsApplyDisplayAs)
                                    fvalue = ScopeTable.GetDFKA(itemValue, ScopeTable.UOMID);
                                if ((!_isExpandableNonCompositeForeignKey) || (String.IsNullOrEmpty(fvalue)))
                                    fvalue = itemValue.Format(UOMTable.UOMName);

                                if (fvalue == null || fvalue.Trim() == "")
                                    fvalue = cvalue;
                                ListItem newItem = new ListItem(fvalue, cvalue);
                                this.UOMID.Items.Add(newItem);
                                counter += 1;
                            }
                        }
                    }
                    pageNum++;
                }
                while (itemValues.Length == maxItems && counter < maxItems);
            }

            // 4. Set the selected value (insert if not already present).

            if (selectedValue != null &&
                selectedValue.Trim() != "" &&
                !MiscUtils.SetSelectedValue(this.UOMID, selectedValue) &&
                !MiscUtils.SetSelectedDisplayText(this.UOMID, selectedValue))
            {

                // construct a whereclause to query a record with UOM.UOMID = selectedValue

                CompoundFilter filter2 = new CompoundFilter(CompoundFilter.CompoundingOperators.And_Operator, null);
                WhereClause whereClause2 = new WhereClause();
                filter2.AddFilter(new BaseClasses.Data.ColumnValueFilter(UOMTable.UOMID, selectedValue, BaseClasses.Data.BaseFilter.ComparisonOperator.EqualsTo, false));
                whereClause2.AddFilter(filter2, CompoundFilter.CompoundingOperators.And_Operator);

                // Execute the query
                try
                {
                UOMRecord[] rc = UOMTable.GetRecords(whereClause2, new OrderBy(false, false), 0, 1);
                System.Collections.Generic.IDictionary<string, object> vars = new System.Collections.Generic.Dictionary<string, object> ();
                    // if find a record, add it to the dropdown and set it as selected item
                    if (rc != null && rc.Length == 1)
                    {

                        string fvalue = ScopeTable.UOMID.Format(selectedValue);

                        ListItem item = new ListItem(fvalue, selectedValue);
                        item.Selected = true;
                        this.UOMID.Items.Add(item);
                    }
                }
                catch
                {
                }

            }
        }