/// <summary>
/// 如果URL中没有参数，则自动转到选人的界面，动态构造流程
/// </summary>
protected override void DefaultOperation()
{
TransferCommand command = new TransferCommand("SelectUser");
HttpRequest request = HttpContext.Current.Request;
NameValueCollection uriParams = UriHelper.GetUriParamsCollection(request.Url.ToString());
command.NavigateUrl = string.Format("SelectProcessUsers.aspx?ru={0}",
HttpUtility.UrlEncode(UriHelper.CombineUrlParams(request.CurrentExecutionFilePath, uriParams)));
command.Execute();
}
