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ASP.NET技巧：教你制做Web實(shí)時(shí)進(jìn)度條

 更新時(shí)間：2006年09月28日 00:00:00   作者：  

網(wǎng)上已經(jīng)有很多Web進(jìn)度條的例子，但是很多都是估算時(shí)間，不能正真反應(yīng)任務(wù)的真實(shí)進(jìn)度。我自己結(jié)合多線程和ShowModalDialog制做了一個(gè)實(shí)時(shí)進(jìn)度條，原理很簡(jiǎn)單：使用線程開(kāi)始長(zhǎng)時(shí)間的任務(wù)，定義一個(gè)Session，當(dāng)任務(wù)進(jìn)行到不同的階段改變Session的值，線程開(kāi)始的同時(shí)使用ShowModalDialog打開(kāi)一個(gè)進(jìn)度條窗口，不斷刷新這個(gè)窗口獲取Session值，反應(yīng)出實(shí)時(shí)的進(jìn)度。下面就來(lái)看看具體的代碼：（文章結(jié)尾處下載源代碼）

先新建一個(gè)Default.aspx頁(yè)面，
客戶端代碼：

<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>
服務(wù)器端代碼：
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
{
    /**//// <summary>
    /// Summary description for _Default.
    /// </summary>
    public class _Default : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button Button1;

        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
        }

        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.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void LongTask()
        {
            //模擬長(zhǎng)時(shí)間任務(wù)
            //每個(gè)循環(huán)模擬任務(wù)進(jìn)行到不同的階段
            for(int i=0;i<11;i++)
            {
                System.Threading.Thread.Sleep(1000);
                //設(shè)置每個(gè)階段的state值，用來(lái)顯示當(dāng)前的進(jìn)度
                Session["State"] = i+1;
            }
            //任務(wù)結(jié)束
            Session["State"] = 100;

        }

        public static void OpenProgressBar(System.Web.UI.Page Page)
        {
            StringBuilder sbScript = new StringBuilder();

            sbScript.Append("<script language='JavaScript' type='text/javascript'>\n");
            sbScript.Append("<!--\n");
            //需要IE5.5以上支持
            sbScript.Append("window.showModalDialog('Progress.aspx','','dialogHeight: 100px; dialogWidth: 350px; edge: Raised; center: Yes; help: No; resizable: No; status: No;scroll:No;');\n");
            //IE5.5以下使用window.open
            //sbScript.Append("window.open('Progress.aspx','', 'height=100, width=350, toolbar =no, menubar=no, scrollbars=no, resizable=no, location=no, status=no');\n");
            sbScript.Append("http:// -->\n");
            sbScript.Append("</script>\n");

            Page.RegisterClientScriptBlock("OpenProgressBar", sbScript.ToString());
        }

        private void Button1_Click(object sender, System.EventArgs e)
        {
            System.Threading.Thread thread=new System.Threading.Thread(new System.Threading.ThreadStart(LongTask));
            thread.Start();

            Session["State"]=1;
            OpenProgressBar(this.Page);
        }
    }
}


新建一個(gè)進(jìn)度條頁(yè)面Progress.aspx
客戶端：
在head中加入<base target="_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>
服務(wù)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
{
    /**//// <summary>
    /// Summary description for Progress.
    /// </summary>
    public class Progress : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Label lblMessages;
        protected System.Web.UI.WebControls.Panel panelProgress;
        protected System.Web.UI.WebControls.Panel panelBarSide;
        protected System.Web.UI.WebControls.Label lblPercent;

        private int state = 0;
        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
            if(Session["State"]!=null)
            {
                state = Convert.ToInt32(Session["State"].ToString());
            }
            else
            {
                Session["State"]=0;
            }
            if(state>0&&state<=10)
            {
                this.lblMessages.Text = "Task undertaking!";
                this.panelProgress.Width = state*30;
                this.lblPercent.Text = state*10 + "%";
                Page.RegisterStartupScript("","<script>window.setTimeout('window.Form1.submit()',100);</script>");
            }
            if(state==100)
            {
                this.panelProgress.Visible = false;
                this.panelBarSide.Visible = false;
                this.lblMessages.Text = "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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