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列表1:ProgressBar.cs
public class ProgressBar : System.Web.UI.Control， System.Web.UI.ICallbackEventHandler{
private int PercentCompleted{
get
{
if System.Web.HttpContext.Current.Session["PercentComplete"] == null) {
System.Web.HttpContext.Current.Session["PercentComplete"] = 1;
}
else {
System.Web.HttpContext.Current.Session["PercentComplete"] =(int)System.Web.HttpContext.Current.Session["PercentComplete"] + 1;
}
return (int)System.Web.HttpContext.Current.Session["PercentComplete"];
}
set
{
System.Web.HttpContext.Current.Session["PercentComplete"] = 1;
}
}
public string RaiseCallbackEvent(string eventArguments) {
int percent = this.PercentCompleted;
if (percent ＞ 100)
{
this.PercentCompleted = 1;
return "completed";
}
else
{
return percent.ToString() + "%";
}
}
protected override void OnPreRender(EventArgs e) {
this.Page.ClientScript.RegisterClientScriptBlock(typeof(ProgressBar)，
"ProgressBar"， this.GetClientSideScript()， true);
base.OnPreRender(e);
}
protected override void Render(HtmlTextWriter writer) {
System.Text.StringBuilder sb = new StringBuilder();
sb.Append(@"＜table id=""ProgressBarContainer"" bgcolor=""LightSteelBlue""
border=""0"" width=""400"" style=""DISPLAY:none; POSITION: absolute;
Z-INDEX: 10""＞");
sb.Append(@"＜tr＞＜td colspan=""3"" style=""padding:3px 2px 2px 10px""＞");
sb.Append(@"＜font face=""Verdana， Arial， Helvetica， sans-serif"" size=""2""＞");
sb.Append(@"＜span id=""ProgressBarLabel""＞Uploading...＜/span＞");
sb.Append(@"＜/font＞＜/td＞＜/tr＞＜tr＞＜td＞");
sb.Append(@"＜font size=""1""＞ ＜/font＞＜/td＞＜td bgcolor=""#999999""
width=""100%""＞");
sb.Append(@"＜table id=""ProgressBar"" border=""0"" width=""0""
cellspacing=""0""＞");
sb.Append(@"＜tr＞＜td style=""background-image:url(progressbar.gif)""＞
＜font size=""1""＞ ＜/font＞＜/td＞");
sb.Append(@"＜/tr＞＜/table＞＜/td＞");
sb.Append(@"＜td＞＜font size=""1""＞ ＜/font＞＜/td＞＜/tr＞");
sb.Append(@"＜tr height=""5px""＞＜td colspan=""3""＞＜/td＞＜/tr＞");
sb.Append(@"＜/table＞");
writer.Write(sb.ToString());
base.Render(writer);
}
private string GetClientSideScript() {
System.Reflection.Assembly dll =
System.Reflection.Assembly.GetExecutingAssembly();
StreamReader reader;
reader = new StreamReader(dll.GetManifestResourceStream("ProgressBar.txt"));
StringBuilder js = new StringBuilder(reader.ReadToEnd());
string fp = this.Page.ClientScript.GetCallbackEventReference(this， ""， "UpdateProgressBar"， "");
js.Replace("##InitiateCallBack##"， fp);
reader.Close();
return js.ToString();
}
} |
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