Example analysis of how ASP.NET implements progress bar effect

This article mainly introduces in detail ASP.NET to implement a simple progress bar effect, which has certain reference value. Interested readers Friends, you can refer to it

Let’s take a look at the effect of the progress bar first

After I click the button, it will display the progress page. After the progress is completed, the progress bar disappears, which is actually relatively simple.

We need a progress bar code file ProgressBar.htm (note: there are no head tags)

<script language="javascript">
  function SetPorgressBar(pos) {
    //设置进度条居中

    var screenWidth = document.body.offsetWidth;
    ProgressBarSide.style.width = Math.round(screenWidth / 2) + "px";
    ProgressBarSide.style.left = Math.round(screenWidth / 4) + "px";
    ProgressBarSide.style.top = "50px";
    ProgressBarSide.style.height = "21px";
    ProgressBarSide.style.display = "block";

    //设置进度条百分比 
    ProgressBar.style.width = pos + "%";
    ProgressText.innerHTML = pos + "%";
  }

  function SetMaxValue(maxValue) {
    ProgressBarSide.style.width = maxValue + "px";
  }

  //完成后隐藏进度条
  function SetCompleted() {
    ProgressBarSide.style.display = "none";
  }

  function SetTitle(title) {
    ProgressTitle.innerHTML = title;
  }
</script>
<p id="ProgressBarSide" style="position: absolute; height: 21px; width: 100px;
  color: Silver; border-width: 1px; border-style: Solid; display: block">
  <p id="ProgressBar" style="position: absolute; height: 21px; width: 0%; background-color: #1475BB">
  </p>
  <p id="ProgressText" style="position: absolute; height: 21px; width: 100%; text-align: center">
  </p>
  <p id="ProgressTitle" style="position: absolute; height: 21px; top: 21px; width: 100%;
    text-align: center">
  </p>
</p>

Then we need a progress bar class ProgressBar.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;

namespace ZhuoYueE.Dop.Web.UI
{
  /// <summary>
  ///显示进度条
  /// </summary>
  public class ProgressBar : System.Web.UI.Page
  {
    /// <summary>
    /// 最大值
    /// </summary>
    private int MaxValue
    {
      get
      {
        if (ViewState["MaxValue"] == null)
        {
          return 0;
        }
        else
        {
          return Convert.ToInt32(ViewState["MaxValue"]);
        }
      }
      set
      {
        ViewState["MaxValue"] = value;
      }
    }
    /// <summary>
    /// 当前值
    /// </summary>
    private int ThisValue
    {
      get
      {
        if (ViewState["ThisValue"] == null)
        {
          return 0;
        }
        else
        {
          return Convert.ToInt32(ViewState["ThisValue"]);
        }
      }
      set
      {
        ViewState["ThisValue"] = value;
      }
    }
    /// <summary>
    /// 当前页面
    /// </summary>
    System.Web.UI.Page m_page;
    /// <summary>
    /// 功能描述:构造函数
    /// 作　　者:huangzh
    /// 创建日期:2016-05-06 11:54:34
    /// 任务编号:
    /// </summary>
    /// <param name="page">当前页面</param>
    public ProgressBar(System.Web.UI.Page page)
    {
      m_page = page;
    }

    public void SetMaxValue(int intMaxValue)
    {
      MaxValue = intMaxValue;
    }

    /// <summary>
    /// 功能描述:初始化进度条
    /// 作　　者:huangzh
    /// 创建日期:2016-05-06 11:55:26
    /// 任务编号:
    /// </summary>
    public void InitProgress()
    {
      //根据ProgressBar.htm显示进度条界面
      string templateFileName = AppDomain.CurrentDomain.BaseDirectory + "ProgressBar.htm";
      StreamReader reader = new StreamReader(@templateFileName, System.Text.Encoding.GetEncoding("GB2312"));
      string strhtml = reader.ReadToEnd();
      reader.Close();
      m_page.Response.Write(strhtml);
      m_page.Response.Flush();
    }

    /// <summary>
    /// 功能描述:设置标题
    /// 作　　者:huangzh
    /// 创建日期:2016-05-06 11:55:36
    /// 任务编号:
    /// </summary>
    /// <param name="strTitle">strTitle</param>
    public void SetTitle(string strTitle)
    {
      string strjsBlock = "<script>SetTitle(&#39;" + strTitle + "&#39;); </script>";

      m_page.Response.Write(strjsBlock);
      m_page.Response.Flush();
    }

    /// <summary>
    /// 功能描述:设置进度
    /// 作　　者:huangzh
    /// 创建日期:2016-05-06 11:55:45
    /// 任务编号:
    /// </summary>
    /// <param name="percent">percent</param>
    public void AddProgress(int intpercent)
    {
      ThisValue = ThisValue + intpercent;
      double dblstep = ((double)ThisValue / (double)MaxValue) * 100;

      string strjsBlock = "<script>SetPorgressBar(&#39;" + dblstep.ToString("0.00") + "&#39;); </script>";

      m_page.Response.Write(strjsBlock);
      m_page.Response.Flush();
    }


    public void DisponseProgress()
    {
      string strjsBlock = "<script>SetCompleted();</script>";
      m_page.Response.Write(strjsBlock);
      m_page.Response.Flush();
    }
  }
}

Then it’s time to call the method. The call is very simple. Add code to the button event or somewhere else on the page. How about using

protected void btnImport_Click(object sender, EventArgs e)
    {
      ProgressBar pb = new ProgressBar(this);
      pb.SetMaxValue(110);
      pb.InitProgress();
      pb.SetTitle("这是一个测试数据");
      for (int i = 1; i <= 110; i++)
      {
        pb.AddProgress(1);
        //此处用线程休眠代替实际的操作，如加载数据等
        System.Threading.Thread.Sleep(50);
      }
      pb.DisponseProgress();
    }

in the button event? Isn't it very simple?

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