C1FlexGrid: 对绑定的数据对象排序

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 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);
};

 C1FlexGrid: 对绑定的数据对象排序

Download CS Sample
Download VB Sample

 

 

葡萄城控件产品网站:http://www.gcpowertools.com.cn/
葡萄城技术支持论坛:http://gcdn.grapecity.com/

你可能感兴趣的:(WinForm,第三方控件,ComponentOne,开发控件)