自定义控件（dll）如何才有能子控件的代码提示？

Question

我已经做了一个控件，能够在aspx页面实现：但问题是每次使用都必须自己输入子控件的标签 <TemplateItem>,请问怎么才能实现如：这样的代码提示？PS:C#,VS2008

Answer 1

比如我们在用 Repeater 控件的时候，建立模板控件，只需要在 
<asp:Repeater runat="server" id="rpt"> 这行后面回车然后输入一个 < ，系统自动会展开一个代码提示框，让你选择
AlternatingItemTemlate
FooterTemplate
HeaderTemplate
ItemTemplate
SeparatorTemplate
这几项，这样就无需自己去输入，也不需要记住这些子控件的标签。现在我建立的控件有个名为 TemplateItem 的标签，希望在输入 < 系统能够提示这个标签出来，（如果有更多的的子控件标签就可以选择），免得每次都要自己来输入。明白我的意思了吗？
谢谢！

Answer 2

唉...copy 给你vs帮助示例.// VacationHome.cs
using System;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.Design;namespace Samples.AspNet.CS.Controls
{
    [
    AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level=AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.Demand,
        Level = AspNetHostingPermissionLevel.Minimal),
Designer(typeof(VacationHomeDesigner)),
    DefaultProperty("Title"),
    ToolboxData(
        "<{0}:VacationHome runat=\"server\"> </{0}:VacationHome>"),
    ]
    public class VacationHome : CompositeControl
    {
        private ITemplate templateValue;
        private TemplateOwner ownerValue;        [
        Bindable(true),
        Category("Data"),
        DefaultValue(""),
        Description("Caption")
        ]
        public virtual string Caption
        {
            get
            {
                string s = (string)ViewState["Caption"];
                return (s == null) ? String.Empty : s;
            }
            set
            {
                ViewState["Caption"] = value;
            }
        }        [
        Browsable(false),
        DesignerSerializationVisibility(
            DesignerSerializationVisibility.Hidden)
        ]
        public TemplateOwner Owner
        {
            get
            {
                return ownerValue;
            }
        }        [
        Browsable(false),
        PersistenceMode(PersistenceMode.InnerProperty),
        DefaultValue(typeof(ITemplate), ""),
        Description("Control template"),
        TemplateContainer(typeof(VacationHome))
        ]
        public virtual ITemplate Template
        {
            get
            {
                return templateValue;
            }
            set
            {
                templateValue = value;
            }
        }        [
        Bindable(true),
        Category("Data"),
        DefaultValue(""),
        Description("Title"),
        Localizable(true)
        ]
        public virtual string Title
        {
            get
            {
                string s = (string)ViewState["Title"];
                return (s == null) ? String.Empty : s;
            }
            set
            {
                ViewState["Title"] = value;
            }
        }        protected override void CreateChildControls()
        {
            Controls.Clear();
            ownerValue = new TemplateOwner();            ITemplate temp = templateValue;
            if (temp == null)
            {
                temp = new DefaultTemplate();
            }            temp.InstantiateIn(ownerValue);
            this.Controls.Add(ownerValue);
        }        public override void DataBind()
        {
            CreateChildControls();
            ChildControlsCreated = true;
            base.DataBind();
        }    }    [
    ToolboxItem(false)
    ]
    public class TemplateOwner : WebControl
    {
    }    #region DefaultTemplate
    sealed class DefaultTemplate : ITemplate
    {
        void ITemplate.InstantiateIn(Control owner)
        {
            Label title = new Label();
            title.DataBinding += new EventHandler(title_DataBinding);            LiteralControl linebreak = new LiteralControl("<br/>");            Label caption = new Label();
            caption.DataBinding 
                += new EventHandler(caption_DataBinding);            owner.Controls.Add(title);
            owner.Controls.Add(linebreak);
            owner.Controls.Add(caption);        }        void caption_DataBinding(object sender, EventArgs e)
        {
            Label source = (Label)sender;
            VacationHome container = 
                (VacationHome)(source.NamingContainer);
            source.Text = container.Caption;
        }        void title_DataBinding(object sender, EventArgs e)
        {
            Label source = (Label)sender;
            VacationHome container = 
                (VacationHome)(source.NamingContainer);
            source.Text = container.Title;
        }
    }
    #endregion
   public class VacationHomeDesigner : ControlDesigner
   {        public override void Initialize(IComponent Component)
{
            base.Initialize(Component);
            SetViewFlags(ViewFlags.TemplateEditing, true);
        }        public override string GetDesignTimeHtml()
{
            return "<span>This is design-time HTML</span>";
        }        public override TemplateGroupCollection TemplateGroups
{
            get {
TemplateGroupCollection collection = new TemplateGroupCollection();
TemplateGroup group;
TemplateDefinition template;
VacationHome control;                control = (VacationHome)Component;
                group = new TemplateGroup("Item");
                template = new TemplateDefinition(this, "Template", control, "Template", true);
                group.AddTemplateDefinition(template);
                collection.Add(group);
return collection;
            }
        }
}}