網上已經有很多Web進度條的例子，但是很多都是估算時間，不能正真反應任務的真實進度。我自己結合多線程和ShowModalDialog制做了一個實時進度條，原理很簡單：使用線程開始長時間的任務，定義一個Session，當任務進行到不同的階段改變Session的值，線程開始的同時使用ShowModalDialog打開一個進度條窗口，不斷刷新這個窗口獲取Session值，反應出實時的進度。下面就來看看具體的代碼：（文章結尾處下載源代碼）
先新建一個Default.aspx頁面，
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()
??????? {
??????????? //模擬長時間任務
??????????? //每個循環模擬任務進行到不同的階段
??????????? for(int i=0;i<11;i++)
??????????? {
??????????????? System.Threading.Thread.Sleep(1000);
??????????????? //設置每個階段的state值，用來顯示當前的進度
??????????????? Session["State"] = i+1;
??????????? }
??????????? //任務結束
??????????? 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);
??????? }
??? }
}
新建一個進度條頁面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
??? }
}
posted on 2007-03-23 10:28
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