/// <summary>
        /// 输出对象的各个成员.
        /// </summary>
        /// <param name="iw">带缩进输出者.</param>
        /// <param name="owner">欲查询成员的对象. 查询静态成员时可以设为 null.</param>
        /// <param name="tp">类型. 当 <paramref name="owner"/> 非 null 时, 可设为null, 即自动设为 <c>owner.GetType()</c> . </param>
        /// <param name="options">成员选项. 实际的成员选项是本参数与 <see cref="IndentedWriterContext.MemberOptions"/> 属性做或运算后的值. </param>
        /// <param name="handle">每个成员的处理过程, 可以为 null. 默认在调用时会将其 <c>sender</c>参数设为null. </param>
        /// <param name="context">环境对象, 可以为 null. 会嵌套传递. </param>
        /// <returns>是否成功.</returns>
        public static bool ForEachMember(IIndentedWriter iw, object owner, Type tp, IndentedWriterMemberOptions options, EventHandler <IndentedWriterMemberEventArgs> handle, IndentedWriterContext context)
        {
            bool rt = false;

            if (null == tp)
            {
                if (null == owner)
                {
                    return(rt);
                }
                tp = owner.GetType();
            }
            if (null == owner && (options & IndentedWriterMemberOptions.OnlyStatic) == 0)
            {
                throw new ArgumentException("options not has Static, but owner is null.", "bindingAttr");
            }
            // notify begin.
            if (null == context)
            {
                context = new IndentedWriterContext();                                  // 自动创建环境. 有可能以后调整设计, 所以后面还是检查 context.
            }
            if (null != context)
            {
                if (!context.NotifyForEachMemberBegin(iw, owner, tp, options, handle, context))
                {
                    return(false);
                }
            }
            // args
            IndentedWriterMemberEventArgs args = new IndentedWriterMemberEventArgs();

            args.IsCancel       = false;
            args.IsCancelAll    = false;
            args.HasDefault     = false;
            args.IndentedWriter = iw;
            args.Owner          = owner;
            args.OwnerType      = tp;
            args.MemberOptions  = options;
            //args.Procs = procs;
            args.Context = context;
            // foreach.
            IndentedWriterMemberOptions realoptions = options;

            if (null != context)
            {
                realoptions |= context.MemberOptions;
            }
            foreach (MemberInfo mi in GetMembers(tp, realoptions))
            {
                string AppendComment2 = null;                   // 备用的附加注释. 可能会在 args.AppendComment 为null时 使用.
                args.IsCancel      = true;
                args.HasDefault    = false;
                args.MemberInfo    = mi;
                args.MemberName    = TypeUtil.GetMemberNameAuto(mi, DefaultMemberNameOption);             //mi.Name;
                args.Value         = null;
                args.ValueOptions  = IndentedWriterValueOptions.ExistValue;
                args.AppendComment = null;
                args.WriteProc     = null;
                //Debug.WriteLine(mi.ToString());
                //
                //bool bOk = false;
                //object value = null;
                //IndentedWriterObjectProc writeproc = null;
                //IndentedWriterValueOptions iwvo = IndentedWriterValueOptions.ExistValue;
                //bool isdefault = false;
                // get value.
                if (false)
                {
                }
                else if (mi is FieldInfo)
                {
                    FieldInfo fi = mi as FieldInfo;
                    args.IsCancel = false;
                    if (true)
                    {
                        try {
                            args.Value        = fi.GetValue(owner);
                            args.ValueOptions = IndentedWriterValueOptions.Default;
                            args.HasDefault   = true;
                            AppendComment2    = string.Format("<{0}>", fi.FieldType.Name);
                        }
                        catch (Exception ex) {
                            Debug.WriteLine(ex);
                        }
                    }
                }
                else if (mi is PropertyInfo)
                {
                    PropertyInfo pi = mi as PropertyInfo;
                    args.IsCancel = false;
                    if (pi.CanRead && pi.GetIndexParameters().Length <= 0)
                    {
                        try {
                            args.Value        = pi.GetValue(owner, null);
                            args.ValueOptions = IndentedWriterValueOptions.Default;;
                            args.HasDefault   = true;
                            AppendComment2    = string.Format("<{0}>", pi.PropertyType.Name);
                        }
                        catch (Exception ex) {
                            Debug.WriteLine(ex);
                        }
                    }
                }
                else if (mi is MethodInfo)
                {
                    if ((realoptions & IndentedWriterMemberOptions.AllowMethod) != 0)
                    {
                        MethodInfo methodinfo = mi as MethodInfo;
                        args.IsCancel     = false;
                        args.ValueOptions = IndentedWriterValueOptions.AutoHideValue;
                        //args.MemberName = string.Format("{0}()", mi.Name);
                        AppendComment2 = string.Format("<{0}>", methodinfo.ReturnType.Name);
                    }
                }
                if (args.IsCancel)
                {
                    continue;
                }
                // get proc.
                if (null != args.Value)
                {
                    //args.WriteProc = LookupWriteProcAt(args.Value, context, procs);
                    if (null != context)
                    {
                        args.WriteProc = LookupWriteProcAt(args.Value, context, context.Procs);
                    }
                    //if (null == args.WriteProc && (realoptions & IndentedWriterMemberOptions.NoDefaultProcs) == 0) {
                    //    args.WriteProc = LookupWriteProc(args.Value, context);
                    //}
                    if (null == args.WriteProc && (realoptions & IndentedWriterMemberOptions.NoCommonProcs) == 0)
                    {
                        if (IndentedObjectFunctor.CommonProc(null, args.Value, context))
                        {
                            args.WriteProc = IndentedObjectFunctor.CommonProc;
                        }
                    }
                }
                // handle
                if (null != handle)
                {
                    //handle(context, mi, value, ref writeproc, ref iwvo, ref isdefault);
                    handle(null, args);
                }
                if (args.IsCancelAll)
                {
                    break;
                }
                if (args.IsCancel)
                {
                    continue;
                }
                // show.
                if (args.HasDefault)
                {
                    if (null == args.Value && null == args.AppendComment)
                    {
                        args.AppendComment = AppendComment2;
                    }
                    WriteLineValue(iw, args.MemberName, args.Value, args.ValueOptions, args.AppendComment);
                    if (null != args.WriteProc)
                    {
                        args.WriteProc(iw, args.Value, context);
                    }
                }
            }
            // notify begin.
            if (null != context)
            {
                context.NotifyForEachMemberEnd(iw, owner, tp, options, handle, context);
            }
            rt = true;
            return(rt);
        }
        /// <summary>
        /// 输出派生类及成员.
        /// </summary>
        /// <param name="iw">带缩进输出者.</param>
        /// <param name="basetype">Base Class type.</param>
        /// <param name="assembly">Assembly.</param>
        /// <param name="context">State Object. Can be null.</param>
        /// <returns>返回是否成功输出.</returns>
        public static bool WriteDerivedClass(IIndentedWriter iw, Type basetype, Assembly assembly, IndentedWriterContext context)
        {
            if (null == iw)
            {
                return(false);
            }
            if (null == basetype)
            {
                return(false);
            }
            //Type basetype = typeof(Calendar);
#if (NETFX_CORE)
            TypeInfo tiBase = basetype.GetTypeInfo();
#endif
            //Assembly assembly = basetype.Assembly;
            if (null == assembly)
            {
#if (NETFX_CORE)
                assembly = tiBase.Assembly;
#else
                assembly = basetype.Assembly;
#endif
            }
            if (!iw.Indent(basetype))
            {
                return(false);
            }
            iw.WriteLine("# DerivedClass of <{0}>:", basetype.FullName);
            int cnt = 0;
            IEnumerable <Type> lst = null;
#if (NETFX_CORE)
            lst = assembly.ExportedTypes;
#else
            lst = assembly.GetExportedTypes();
#endif
            foreach (Type tp in lst)
            {
                // check.
#if (NETFX_CORE)
                TypeInfo ti = tp.GetTypeInfo();
                if (!ti.IsAssignableFrom(tiBase))
                {
                    continue;
                }
#else
                if (tp.IsAbstract)
                {
                    continue;
                }
                if (!tp.IsSubclassOf(basetype))
                {
                    continue;
                }
#endif
                // new.
                object ob = null;
                try {
                    ob = Activator.CreateInstance(tp);
                }
                catch {
                    // 忽略.
                }
                if (null == ob)
                {
                    continue;
                }
                // write.
                iw.WriteLine("DerivedClass[{0}]:\t# <{1}>", cnt, tp.Name);
                WriteTypeStatic(iw, tp, context);
                IndentedObjectFunctor.CommonProc(iw, ob, context);
                ++cnt;
            }
            iw.Unindent();
            return(true);
        }