问ASP.NET客户端回发

EN

using System;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace BinaryOcean.Web.Library.WebControls
{
    [ToolboxData("<{0}:PostBackTimer runat=\"server\" />"), DefaultProperty("Seconds"), DefaultEvent("Timeout")]
    public class PostBackTimer : Control, IPostBackEventHandler
    {
        public PostBackTimer() { }

        public string CommandArgument
        {
            get { return (string)ViewState["CommandArgument"] ?? string.Empty; }
            set { ViewState["CommandArgument"] = value; }
        }

        public string CommandName
        {
            get { return (string)ViewState["CommandName"] ?? string.Empty; }
            set { ViewState["CommandName"] = value; }
        }

        public bool Enabled
        {
            get { return (bool)(ViewState["Enabled"] ?? true); }
            set { ViewState["Enabled"] = value; }
        }

        public int Seconds
        {
            get { return (int)(ViewState["Seconds"] ?? 0); }
            set { ViewState["Seconds"] = value; }
        }

        [Description("PostBackTimer_OnTimeout")]
        public event EventHandler Timeout = delegate { };

        [Description("PostBackTimer_OnCommand")]
        public event CommandEventHandler Command = delegate { };

        public void RaisePostBackEvent(string eventArgument)
        {
            Timeout(this, EventArgs.Empty);
            Command(this, new CommandEventArgs(CommandName, CommandArgument));
        }

        protected override void OnPreRender(EventArgs e)
        {
            if (Enabled && Seconds > 0)
            {
                var postback = Page.ClientScript.GetPostBackEventReference(this, null);
                var script = string.Format("setTimeout(\"{0}\",{1});", postback, Seconds * 1000);
                Page.ClientScript.RegisterStartupScript(GetType(), "PostBackTimer_" + UniqueID, script, true);
            }

            base.OnPreRender(e);
        }
    }
}