简单实用的防止多次提交辅助类

  一：  开题

    这篇只是一个简单的应用技巧，高手请跳过，别拍砖，打击我这个有激情的菜鸟。在我们的web项目中经常会遇见由于网络原为等问题，而导致在页面提高后，服务器还没有来得及返回的时候，我们的用户可能在此点击按钮使的数据多次的提交。防止这个行为很简单，我们一般经常是在按钮点击后使其禁用disabled=true。我是一个很懒的人（生活中并不懒，只是写Code比较懒，我的目标是：少写Code，基于配置而不写Code是最好的）。所以就有了这个简单的辅助类：我的思路是在page的PreRender时间中注册提交前执行的脚本全部提交按钮的disabled=true（  page.ClientScript.RegisterOnSubmitStatement（）。）等待服务器返回时会更具返回浏览器会重绘，所以我们的设置此时已经无用了。呵呵就这面简单。但是为不少写代码，那些了一个辅助类DoubleSubmitPrevent，提供的几种方式自动按照按钮，或者是手动添加按钮(取决于IsAutoFind)，自动查找的起点默认为page，但是为了效率你可以自己设置BaseContrlForFind，关于需要禁止的按钮的判断为IsPreventControl你可以自己定义覆盖默认的，默认为：

private System.Predicate<System.Web.UI.Control> isPreventControl = t => (t is System.Web.UI.WebControls.Button) || 
                       (t is System.Web.UI.WebControls.LinkButton) || 
                       (t is System.Web.UI.WebControls.ImageButton) || 
                       (t is System.Web.UI.HtmlControls.HtmlButton) || 
           //(t is System.Web.UI.HtmlControls.HtmlLink) || 
                       (t is System.Web.UI.HtmlControls.HtmlInputButton) || 
                       (t is System.Web.UI.HtmlControls.HtmlInputSubmit); 

如果你还是觉得效率不好那么，你就可以自己Add或者AddRange，同时包括了Remove，Insert等方法，这一系列方法都支持链式操作（这是第一次使用jQuery的时候给我的最大触动）。例如：dsp.Add(Button1).Add(Button2).Add(Button3).Add(LinkButton1).Add(LinkButton2) =dsp.AddRange(Button1,Button2,Button3,LinkButton1,LinkButton2);包括的多个重载;

  二： Code部分

说了这么多还是直接上代码：

namespace Wolf.Utils 
{ 
    public class DoubleSubmitPrevent 
    { 
        private System.Collections.Generic.List<string> _clientIDList = null; 
        private const string DOUBLE_SUBMIT_PREVENT_STR = "B3F6F682-F404-4519-9F30-79876E5A5C9A_WOLF_DOUBLESUBMITPREVENT_391B8D4F-757E-4005-8262-062652D8BAC6"; 
        private bool isAutoFind = false; 
        #region judje  Prevent Control? 
        private System.Predicate<System.Web.UI.Control> isPreventControl = t => (t is System.Web.UI.WebControls.Button) || 
                        (t is System.Web.UI.WebControls.LinkButton) || 
                        (t is System.Web.UI.WebControls.ImageButton) || 
                        (t is System.Web.UI.HtmlControls.HtmlButton) || 
            //(t is System.Web.UI.HtmlControls.HtmlLink) || 
                        (t is System.Web.UI.HtmlControls.HtmlInputButton) || 
                        (t is System.Web.UI.HtmlControls.HtmlInputSubmit); 
        #endregion 
        private System.Web.UI.Control baseContrlForFind = null;

        /// <summary> 
        /// Auto Find will satrt with this Control;Default this Page . 
        /// </summary> 
        public System.Web.UI.Control BaseContrlForFind 
        { 
            get { return baseContrlForFind; } 
            set { baseContrlForFind = value; } 
        }

        /// <summary> 
        /// judje the Contrl that be prevented; 
        /// </summary> 
        public System.Predicate<System.Web.UI.Control> IsPreventControl 
        { 
            get { return isPreventControl; } 
            set { isPreventControl = value; } 
        } 
        /// <summary> 
        /// Auto Find the Control that be prevented ? 
        /// </summary> 
        public bool IsAutoFind 
        { 
            get { return isAutoFind; } 
            set { isAutoFind = value; } 
        }

        public DoubleSubmitPrevent(System.Web.UI.Page page) 
        { 
            _clientIDList = new System.Collections.Generic.List<string>(); 
            baseContrlForFind = page; 
            page.PreRenderCompleted += new System.EventHandler(DoubleSubmitPreventPagePreRenderHick); 
        }

        public DoubleSubmitPrevent Add(string clientID) 
        { 
            _clientIDList.Add(clientID); 
            return this; 
        } 
        public DoubleSubmitPrevent Add(System.Web.UI.Control ctr) 
        { 
            _clientIDList.Add(ctr.ClientID); 
            return this; 
        }

        public DoubleSubmitPrevent AddRange(params string[] clientIDs) 
        { 
            _clientIDList.AddRange(clientIDs); 
            return this; 
        }

        public DoubleSubmitPrevent AddRange(params System.Web.UI.Control[] ctrs) 
        { 
            foreach (var item in ctrs) 
            { 
                Add(item); 
            } 
            return this; 
        }

        public DoubleSubmitPrevent Remove(string clientID) 
        { 
            _clientIDList.Remove(clientID); return this; 
        }

        public DoubleSubmitPrevent Remove(System.Web.UI.Control ctr) 
        { 
            _clientIDList.Remove(ctr.ClientID); 
            return this; 
        }

        public bool Exists(string clientID) 
        { 
            return _clientIDList.Exists(t => t.Equals(clientID)); 
        }

        public bool Exists(System.Web.UI.Control ctr) 
        { 
            return _clientIDList.Exists(t => t.Equals(ctr.ClientID)); 
        }

        protected virtual void DoubleSubmitPreventPagePreRenderHick(object sender, System.EventArgs e) 
        { 
            System.Web.UI.Page page = sender as System.Web.UI.Page; 
            if (page != null) 
            {

                if (isAutoFind) 
                { 
                    #region Find Action 
                    System.Action<System.Collections.Generic.List<string>, System.Web.UI.Control> action = null; 
                    action = (list, ctr) => 
                    { 
                        if (ctr != null) 
                        { 
                            if (isPreventControl(ctr)) 
                            { 
                                list.Add(ctr.ClientID); 
                            } 
                            foreach (System.Web.UI.Control item in ctr.Controls) 
                            { 
                                action(list, item); 
                            } 
                        }

                    }; 
                    #endregion 
                    action(_clientIDList, baseContrlForFind);

                }

                System.Text.StringBuilder sb = new System.Text.StringBuilder(); 
                foreach (var item in _clientIDList) 
                { 
                    sb.Append(string.Format(" document.getElementById(\"{0}\").disabled=true;", item)); 
                } 
                page.ClientScript.RegisterOnSubmitStatement(this.GetType(), DOUBLE_SUBMIT_PREVENT_STR, sb.ToString()); 
            } 
        } 
    } 
}

  三： 测试：

为了模拟延时，我在后台加了睡眠：

protected void Page_Load(object sender, EventArgs e) 
   { 
       if (IsPostBack) 
       { 
           System.Threading.Thread.Sleep(1000 * 5); 
           TextBox1.Text = DateTime.Now.ToString(); 
           Button3.Enabled = false; 
       } 
       Wolf.Utils.DoubleSubmitPrevent dsp = new Wolf.Utils.DoubleSubmitPrevent(this) { IsAutoFind = true, BaseContrlForFind = this.form1 }; 
       //dsp.Add(Button1).Add(Button2).Add(Button3).Add(LinkButton1).Add(LinkButton2); 
       
   } 

 前台html（乱托乱扔的，看来是比较懒）：

<form id="form1" runat="server"> 
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
    <asp:Button ID="Button1" runat="server" Text="Button" Enabled="false" /> 
     <asp:Button ID="Button2" runat="server" Text="Button" /> 
      <asp:Button ID="Button3" runat="server" Text="Button" /> 
    <asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton><asp:LinkButton 
        ID="LinkButton2" runat="server">LinkButton</asp:LinkButton> 
    </form>

效果：

如果你又更好的方案，也希望能给我分享，请大家多多指教。