自定义控件模板控件

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最近学习自定义控件中的模板控件，下面先贴控件代码和效果图

using System.ComponentModel;using System.Web.UI;using System.Web.UI.Design;using System.Web.UI.WebControls;namespace PZY.BLL.Web.lx._6sjq.mb{    //给控件添加一个设计器    [Designer(typeof(MyTemplateControlDesigner))]    public class MyTemplateControl : WebControl, INamingContainer    {        private ITemplate[] _templates;         //声明模板集        public MyTemplateControl()        {            _templates = new ITemplate[4];      //定义模板集        }        //模板1        [Browsable(false),PersistenceMode(PersistenceMode.InnerProperty)]        public ITemplate Template1        {            get { return _templates[0]; }            set { _templates[0] = value; }        }        //模板2        [Browsable(false), PersistenceMode(PersistenceMode.InnerProperty)]        public ITemplate Template2        {            get { return _templates[1]; }            set { _templates[1] = value; }        }        //模板3        [Browsable(false), PersistenceMode(PersistenceMode.InnerProperty)]        public ITemplate Template3        {            get { return _templates[2]; }            set { _templates[2] = value; }        }        //模板4        [Browsable(false), PersistenceMode(PersistenceMode.InnerProperty)]        public ITemplate Template4        {            get { return _templates[3]; }            set { _templates[3] = value; }        }        //把模板添加到子控件        protected override void CreateChildControls()        {            for(int i=0;i<4;i++)            {                Panel pan=new Panel();                _templates[i].InstantiateIn(pan);                this.Controls.Add(pan);            }        }    }    /// <summary>    /// 定义设计器    /// </summary>    public class MyTemplateControlDesigner:ControlDesigner    {        private TemplateGroupCollection col = null;        public override void Initialize(IComponent component)        {            base.Initialize(component);            SetViewFlags(ViewFlags.TemplateEditing,true);        }        //设计时控件显示的内容        public override string GetDesignTimeHtml()        {            MyTemplateControl control = (MyTemplateControl) Component;            string message = "Click here and use the task menu to edit the templates,";            if(control.Template1!=null)            {                message += "<br/>Template1 finished";            }            if (control.Template2 != null)            {                message += "<br/>Template2 finished";            }            if (control.Template3 != null)            {                message += "<br/>Template3 finished";            }            if (control.Template4 != null)            {                message += "<br/>Template4 finished";            }            return CreatePlaceHolderDesignTimeHtml(message);        }        /// <summary>        /// 通过重写TemplateGroups属性为控件每一个模板对应一个模板定义        /// TemplateGroup对模板进行分组        /// TemplateDefinition定义模板（父设计器,模板名字,模板控件,模板控件中的ITemplate属性）        /// </summary>        public override TemplateGroupCollection TemplateGroups        {            get            {                if(col==null)                {                    col = base.TemplateGroups;                    TemplateDefinition tempDef;                    MyTemplateControl ctl = (MyTemplateControl) Component;                    //模板组A                    TemplateGroup tempGroup=new TemplateGroup("Template Set A");                    tempDef=new TemplateDefinition(this,"Template  A1",ctl,"Template1",true);                    tempGroup.AddTemplateDefinition(tempDef);                    tempDef = new TemplateDefinition(this, "Template  A2", ctl, "Template2", true);                    tempGroup.AddTemplateDefinition(tempDef);                    col.Add(tempGroup);                    //模板组B                     tempGroup = new TemplateGroup("Template Set B");                    tempDef = new TemplateDefinition(this, "Template  B1", ctl, "Template3", true);                    tempGroup.AddTemplateDefinition(tempDef);                    tempDef = new TemplateDefinition(this, "Template  B2", ctl, "Template4", true);                    tempGroup.AddTemplateDefinition(tempDef);                    col.Add(tempGroup);                }                return col;            }        }        /// <summary>        /// 是否允许改变大小        /// </summary>        public override bool AllowResize        {            get            {                if(this.InTemplateMode)                {                    return true;                }                return false;            }        }    }}