1. 创建一个用户控件。
| 以下是代码片段： namespace Northwind.WebSite.UserControls { public partial class CategoryDetail : System.Web.UI.UserControl { private Category category; public Category Category { set { category = value; } get { return category; } } protected void Page_Load(object sender, EventArgs e) { } protected void Page_PreRender(object sender, EventArgs e) { GridViewProducts.DataSource = category.Products; GridViewProducts.DataBind(); LableCategoryName.Text = category.CategoryName; LabelTotalPrice.Text = string.Format("Total price: {0}", category.Products.Sum(p => p.UnitPrice * (p.UnitsInStock + p.UnitsOnOrder))); } public void ExpandCollapsiblePanel() { CollapsiblePanelExtender1.Collapsed = false; } } } |
2. 实现ITemplate。
| 以下是代码片段： namespace Northwind.WebSite.TemplateControl { public class CategoryDetailTemplate : ITemplate { public void InstantiateIn(Control container) { CategoryDetail detail = (CategoryDetail)BuildManager. CreateInstanceFromVirtualPath("~/UserControls/CategoryDetail.ascx", typeof(CategoryDetail)); container.DataBinding += delegate(object sender, EventArgs e) { IDataItemContainer container1 = container as IDataItemContainer; detail.Category = (Category)container1.DataItem; if (container1.DataItemIndex == 0) { detail.ExpandCollapsiblePanel(); } }; container.Controls.Add(detail); } } } |
3. 动态加载。
| 以下是代码片段： namespace Northwind.WebSite { public partial class ProductsByCategory : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Repeater1.ItemTemplate = new CategoryDetailTemplate(); if (!IsPostBack) { var ds = Category.GetCategories(); Repeater1.DataSource = ds; Repeater1.DataBind(); } } } } |