C# 要做一个进读条.当时间倒计时到10秒，进度条变黄。当时间倒计时到五秒，进度条变红。如何实现？谢谢！
4个回答
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建立一个WEB工程，添加新项->HTML页面，命名为ProgressBar.htm，内容如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" id="mainWindow">
<head>
<title>无标题页</title>
<script language="javascript">
function SetPorgressBar(pos)
{
//设置进度条居中
var screenHeight = window["mainWindow"].offsetHeight;
var screenWidth = window["mainWindow"].offsetWidth;
ProgressBarSide.style.width = Math.round(screenWidth / 2);
ProgressBarSide.style.left = Math.round(screenWidth / 4);
ProgressBarSide.style.top = Math.round(screenHeight / 2);
ProgressBarSide.style.height = "21px";
ProgressBarSide.style.display = "";
//设置进度条百分比
ProgressBar.style.width = pos + "%";
ProgressText.innerHTML = pos + "%";
}
//完成后隐藏进度条
function SetCompleted()
{
ProgressBarSide.style.display = "none";
}
</script>
</head>
<body>
<div id="ProgressBarSide" style="position:absolute;height:21x;width:100px;color:Silver;border-width:1px;border-style:Solid;display:none">
<div id="ProgressBar" style="position:absolute;height:21px;width:0%;background-color:#3366FF"></div>
<div id="ProgressText" style="position:absolute;height:21px;width:100%;text-align:center"></div>
</div>
</body>
</html>
后台代码，Default.aspx.cs：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Threading;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
private void beginProgress()
{
//根据ProgressBar.htm显示进度条界面
string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
StreamReader reader = new StreamReader(@templateFileName,System.Text.Encoding.GetEncoding("GB2312"));
string html = reader.ReadToEnd();
reader.Close();
Response.Write(html);
Response.Flush();
}
private void setProgress(int percent)
{
string jsBlock = "<script>SetPorgressBar('" + percent.ToString() + "'); </script>";
Response.Write(jsBlock);
Response.Flush();
}
private void finishProgress()
{
string jsBlock = "<script>SetCompleted();</script>";
Response.Write(jsBlock);
Response.Flush();
}
private void Page_Load(object sender, System.EventArgs e)
{
beginProgress();
for (int i = 1; i <= 100; i++)
{
setProgress(i);
//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);
}
finishProgress();
}
}
前台页面代码在此省略，可以放置任意控件。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" id="mainWindow">
<head>
<title>无标题页</title>
<script language="javascript">
function SetPorgressBar(pos)
{
//设置进度条居中
var screenHeight = window["mainWindow"].offsetHeight;
var screenWidth = window["mainWindow"].offsetWidth;
ProgressBarSide.style.width = Math.round(screenWidth / 2);
ProgressBarSide.style.left = Math.round(screenWidth / 4);
ProgressBarSide.style.top = Math.round(screenHeight / 2);
ProgressBarSide.style.height = "21px";
ProgressBarSide.style.display = "";
//设置进度条百分比
ProgressBar.style.width = pos + "%";
ProgressText.innerHTML = pos + "%";
}
//完成后隐藏进度条
function SetCompleted()
{
ProgressBarSide.style.display = "none";
}
</script>
</head>
<body>
<div id="ProgressBarSide" style="position:absolute;height:21x;width:100px;color:Silver;border-width:1px;border-style:Solid;display:none">
<div id="ProgressBar" style="position:absolute;height:21px;width:0%;background-color:#3366FF"></div>
<div id="ProgressText" style="position:absolute;height:21px;width:100%;text-align:center"></div>
</div>
</body>
</html>
后台代码，Default.aspx.cs：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Threading;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
private void beginProgress()
{
//根据ProgressBar.htm显示进度条界面
string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
StreamReader reader = new StreamReader(@templateFileName,System.Text.Encoding.GetEncoding("GB2312"));
string html = reader.ReadToEnd();
reader.Close();
Response.Write(html);
Response.Flush();
}
private void setProgress(int percent)
{
string jsBlock = "<script>SetPorgressBar('" + percent.ToString() + "'); </script>";
Response.Write(jsBlock);
Response.Flush();
}
private void finishProgress()
{
string jsBlock = "<script>SetCompleted();</script>";
Response.Write(jsBlock);
Response.Flush();
}
private void Page_Load(object sender, System.EventArgs e)
{
beginProgress();
for (int i = 1; i <= 100; i++)
{
setProgress(i);
//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);
}
finishProgress();
}
}
前台页面代码在此省略，可以放置任意控件。
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用三个图片来实现，每个图片一个颜色一个像素即可，根据您的参数来改变图片的宽度和颜色即可。
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用timer控件 计时 然后用进度条控件显示 改变颜色即可
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Winform的话，联系我。我给做个控件，或者写个源码。
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