反射

 static void Main()
        {
            //LoadAssemblies();
            Func<Type, string> classnameAndBase = null;
            classnameAndBase = t => "-" + t.FullName + ((t.BaseType != typeof(object)) ? classnameAndBase(t.BaseType) : string.Empty);
            //定义查询，在当前AppDomain中加载的所有程序集中查找从exception派生的所有public类型
            var exceptionTree = (from a in AppDomain.CurrentDomain.GetAssemblies()
                                 from t in a.GetExportedTypes()
                                 where t.IsClass && t.IsPublic && typeof(Exception).IsAssignableFrom(t)
                                 let typeHierarchTemp = classnameAndBase(t).Split('-').Reverse().ToArray()
                                 let typeHierarchy = string.Join("-", typeHierarchTemp, 0, typeHierarchTemp.Length - 1)
                                 orderby typeHierarchy
                                 select typeHierarchy
                                   ).ToArray();
            Console.WriteLine("{0} 个异常类", exceptionTree.Count());
            foreach (string s in exceptionTree)
            {
                string[] x = s.Split('-');
                //根据基类型的数量进行缩进
                Console.WriteLine(new string(' ', 3 * (x.Length - 1)) + x[x.Length - 1]);
            }
            Console.ReadKey();
        }