/// <summary>
/// 显示长时间运行任务的进度
/// </summary>
/// <param name="current">任务在进度条的当前位置</param>
/// <param name="last">任务完成位置</param>
public static void Progress(int current, int last)
{
if (pCancelable && ((IProgressStatusCancel)pProgressStatus).Canceled)
{
throw new ProgressCancelException();
}
try
{
double lCurTime = DateTime.Now.ToOADate();
if (current == last) //进度条走完，关闭显示进度条
{
pProgressStatus.Progress(current, last);
pProgressStartTime = 0;
pProgressLastUpdate = 0;
Flush();
}
else if (pProgressStartTime == 0) //开始新的进度条显示
{
pProgressStatus.Progress(current, last);
pProgressStartTime = lCurTime;
pProgressLastUpdate = lCurTime;
Flush();
}
else if (pProgressRefresh == 0 || lCurTime - pProgressLastUpdate > pProgressRefresh)
{
//自上一次更新，时间间隔足够长
pProgressStatus.Progress(current, last);
Application.DoEvents();
Flush();
pProgressLastUpdate = lCurTime;
}
}
catch (Exception) //进度条显示过程中，忽视任何异常
{
}
}
