ASP.NET技巧：教你制做Web实时进度条

网络编程 2024/9/25 佚名

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网上已经有很多Web进度条的例子，但是很多都是估算时间，不能正真反应任务的真实进度。我自己结合多线程和ShowModalDialog制做了一个实时进度条，原理很简单：使用线程开始长时间的任务，定义一个Session，当任务进行到不同的阶段改变Session的值，线程开始的同时使用ShowModalDialog打开一个进度条窗口，不断刷新这个窗口获取Session值，反应出实时的进度。下面就来看看具体的代码：（文章结尾处下载源代码）

先新建一个Default.aspx页面，
客户端代码：

<body MS_POSITIONING="GridLayout">
    <form id="Form1" method="post" runat="server">
            <br>
            <br>
            <asp:Button id="Button1" runat="server" Text="Start Long Task!"></asp:Button>
    </form>
</body>
服务器端代码：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;

namespace WebProgressBar
"State"] = i+1;
"State"] = 100;

"<script language='JavaScript' type='text/javascript'>\n");
            sbScript.Append("\n");
            sbScript.Append("</script>\n");

            Page.RegisterClientScriptBlock("OpenProgressBar", sbScript.ToString());
        "State"]=1;
            OpenProgressBar(this.Page);
        "_self">
<body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <asp:Label id="lblMessages" runat="server"></asp:Label>
            <asp:Panel id="panelBarSide" runat="server" Width="300px" BorderStyle="Solid" BorderWidth="1px"
                ForeColor="Silver">
                <asp:Panel id="panelProgress" runat="server" Width="10px" BackColor="Green"></asp:Panel>
            </asp:Panel>
            <asp:Label id="lblPercent" runat="server" ForeColor="Blue"></asp:Label>
        </form>
</body>
服务器端：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace WebProgressBar
"State"]!=null)
            "State"].ToString());
            "State"]=0;
            "Task undertaking!";
                this.panelProgress.Width = state*30;
                this.lblPercent.Text = state*10 + "%";
                Page.RegisterStartupScript("","<script>window.setTimeout('window.Form1.submit()',100);</script>");
            "Task Completed!";
                Page.RegisterStartupScript("","<script>window.close();</script>");
            }
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }

        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}

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