protected void BtnZip_Click(object sender, EventArgs e)
{
CreatePackage();
ShowPackage();
showfilelist();
BtnZip.Enabled = false;
string xmlurl = "~/Package/read.xml";
string xmlpath = Server.MapPath(xmlurl);
System.IO.File.Delete(xmlpath); //先删除，不存在不引发异常
LearnSite.BLL.Courses cbll = new LearnSite.BLL.Courses();
cbll.CreatPackageNameList(xmlpath); //生成学案包目录对照表
}