//---------------------------- 
// http://webabcd.cnblogs.com/ 
//---------------------------- 

function yy_sl_copyTextToHiddenField(source, destination) 
{ 
/// <summary>将Label控件的的值赋给隐藏控件</summary> 

        document.getElementById(destination).value = document.getElementById(source).innerHTML; 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
using System.Web.UI.WebControls; 
using System.Web.UI; 
 
[assembly: System.Web.UI.WebResource("YYControls.SmartLabel.Resources.ScriptLibrary.js", "text/javascript")] 
 
namespace YYControls 
{ 
        /// <summary> 
        /// SmartLabel类，继承自DropDownList 
        /// </summary> 
        [ToolboxData(@"<{0}:SmartLabel runat='server'></{0}:SmartLabel>")] 
        [System.Drawing.ToolboxBitmap(typeof(YYControls.Resources.Icon), "SmartLabel.bmp")] 
        public partial class SmartLabel : Label 
        { 
                /// <summary> 
                /// 构造函数 
                /// </summary> 
                public SmartLabel() 
                { 
 
                } 
 
                /// <summary> 
                /// OnPreRender 
                /// </summary> 
                /// <param name="e">e</param> 
                protected override void OnPreRender(EventArgs e) 
                { 
                        base.OnPreRender(e); 
 
                        // 实现Label控件的回发(Postback)功能 
                        ImplementPostback(); 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
using System.ComponentModel; 
using System.Web.UI; 
 
namespace YYControls 
{ 
        /// <summary> 
        /// SmartLabel类的属性部分 
        /// </summary> 
        public partial class SmartLabel 
        { 
                /// <summary> 
                /// 使Label支持回发(Postback)的隐藏控件的后缀名 
                /// </summary> 
                [ 
                Browsable(true), 
                Description("使Label支持回发(Postback)的隐藏控件的后缀名"), 
                Category("扩展"), 
                DefaultValue("EnablePostback") 
                ] 
                public virtual string HiddenFieldPostfix 
                { 
                        get 
                        { 
                                string s = (string)ViewState["HiddenFieldPostfix"]; 
 
                                return (s == null) ? "EnablePostback" : s; 
                        } 
                        set 
                        { 
                                ViewState["HiddenFieldPostfix"] = value; 
                        } 
                } 
 
                /// <summary> 
                /// 是否启用Label控件的回发(Postback) 
                /// </summary> 
                [ 
                Browsable(true), 
                Description("是否启用Label控件的回发(Postback)"), 
                Category("扩展"), 
                DefaultValue(false) 
                ] 
                public virtual bool EnablePostback 
                { 
                        get 
                        { 
                                bool? b = (bool?)ViewState["EnablePostback"]; 
 
                                return (b == null) ? false : (bool)b; 
                        } 
 
                        set 
                        { 
                                ViewState["EnablePostback"] = value; 
                        } 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Text; 
 
using System.Data; 
using System.Web.UI.WebControls; 
using System.Web.UI; 
using System.Web; 
 
namespace YYControls 
{ 
        /// <summary> 
        /// SmartLabel类的属性部分 
        /// </summary> 
        public partial class SmartLabel 
        { 
                /// <summary> 
                /// 实现Label控件的回发(Postback)功能 
                /// </summary> 
                private void ImplementPostback() 
                { 
                        if (this.EnablePostback) 
                        { 
                                // 使Label支持回发(Postback)的隐藏控件的ID 
                                string hiddenFieldId = string.Concat(this.ClientID, "_", HiddenFieldPostfix); 
 
                                // 注册隐藏控件 
                                Page.ClientScript.RegisterHiddenField(hiddenFieldId, ""); 
 
                                // 注册客户端脚本 
                                this.Page.ClientScript.RegisterClientScriptResource(this.GetType(), 
                                        "YYControls.SmartLabel.Resources.ScriptLibrary.js"); 
 
                                // 表单提交前将Label控件的的值赋给隐藏控件 
                                this.Page.ClientScript.RegisterOnSubmitStatement(this.GetType(), 
                                        string.Format("yy_sl_enablePostback_{0}", 
                                                this.ClientID), 
                                        string.Format("yy_sl_copyTextToHiddenField('{0}', '{1}')", 
                                                this.ClientID, 
                                                hiddenFieldId)); 
                        } 
                } 
 
                /// <summary> 
                /// 获取或设置 YYControls.SmartLabel 控件的文本内容 
                /// </summary> 
                public override string Text 
                { 
                        get 
                        { 
                                try 
                                { 
                                        if (this.EnablePostback && !string.IsNullOrEmpty(HttpContext.Current.Request[string.Concat(this.ClientID, "_", HiddenFieldPostfix)])) 
                                        { 
                                                // 隐藏控件的值 
                                                return HttpContext.Current.Request[string.Concat(this.ClientID, "_", HiddenFieldPostfix)]; 
                                        } 
                                        else 
                                        { 
                                                return base.Text; 
                                        } 
                                } 
                                catch 
                                { 
                                        return base.Text; 
                                } 
                        } 
                        set 
                        { 
                                try 
                                { 
                                        if (this.EnablePostback && !string.IsNullOrEmpty(HttpContext.Current.Request[string.Concat(this.ClientID, "_", HiddenFieldPostfix)])) 
                                        { 
                                                // 隐藏控件的值 
                                                base.Text = HttpContext.Current.Request[string.Concat(this.ClientID, "_", HiddenFieldPostfix)]; 
                                        } 
                                        else 
                                        { 
                                                base.Text = value; 
                                        } 
                                } 
                                catch 
                                { 
                                        base.Text = value; 
                                } 
                        } 
                } 
        } 
}