近期,使用业务对象作为数据源是十分常见的案例。在这里,不是直接与 Data provider 通信操作数据。C1FlexGrid 直接与客户端缓存数据对象交互。但是,通过 Data Provider 提供的数据缓存和存储在客户端的缓存有所不同。使用后者,我们将无法使用 C1Flexgrid 排序特性。这是不尽如人意的。
引用实际工作中案例-最近有用户使用 C1FlexGrid 绑定 BindingList。但是,排序功能无法正常使用。然而,MS-Access 和 SQL 绑 定到 C1FlexGrid 时,支持排序功能,因为这两种数据源类型本身支持排序。BindingList 没有提供排序接口。为了实现该功能,我们可以继承该类,重载 (ApplySortCore, RemoveSortCore, SupportsSortingCore, SortDirectionCore 等)方法。
下面代码为基类:
public class Sales { public Sales() { SaleDate = DateTime.Now; } public SortedBindingList<Book> SaleDetails { get; set; } public string Dealer { get; set; } public string Customer { get; set; } public DateTime SaleDate { get; set; } public decimal TotalAmount { get { return SaleDetails.Sum(a => a.TotalAmount); } } } public class Book { public string Title { get; set; } public int Quantity { get; set; } public decimal Cost { get; set; } public decimal TotalAmount { get { return Cost * Quantity; } } }
最后,创建商业对象列表,用于绑定 C1FlexGrid:
var sales = new[] { new Sales(){ Customer = "John Smith", SaleDate = new DateTime(2008,1,1), Dealer = "James Franco", SaleDetails = new SortedBindingList<Book>(){ new Book(){ Title = "Pride And Prejudice", Quantity = 1, Cost = 25 }, new Book(){ Title = "Jane Eyer", Quantity = 2, Cost = 35 }, new Book(){ Title = "Wuthering Heights", Quantity = 1, Cost = 55 } } }, new Sales(){ Customer = "John Ayers", SaleDate = new DateTime(2008,1,2), Dealer = "Tom Cruise", SaleDetails = new SortedBindingList<Book>(){ new Book(){ Title = "Emma", Quantity = 1, Cost = 80 }, new Book(){ Title = "Sense And Sensibility", Quantity = 5, Cost = 100 }, new Book(){ Title = "Romeo And Juliet", Quantity = 3, Cost = 50 } } } }; //BindingList set as grid's DataSource this.c1FlexGrid1.DataSource = new SortedBindingList<Sales>(sales);
现在,C1FlexGrid 已经绑定了 BindingList。以下代码用于显示排序指示器:
this.c1FlexGrid1.AfterSort += (s1, e1) => { var flex = s1 as C1.Win.C1FlexGrid.C1FlexGrid; flex.Invalidate(); flex.ShowSortAt(e1.Order, e1.Col); };
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