public static College GetCollegeBLLInstance()
{
//如实例不存在，则New一个新实例，否则返回已有实例
if (CollegeBLLInstance == null)
{
lock (syncRootCollege)
{
if (CollegeBLLInstance == null)
CollegeBLLInstance = new College();
}
}
return CollegeBLLInstance;
}
public static string GetCollegeName(int id)
{
var bll = new College();
return bll.GetModel(id).Name;
}