C#如何构建对象，get 还是 new object

请问下，下面这个类如何构建对象呢？

#region Assembly Siemens.Engineering, Version=16.0.0.0, Culture=neutral, PublicKeyToken=d29ec89bac048f84
// C:\Program Files\Siemens\Automation\Portal V16\PublicAPI\V16\Siemens.Engineering.dll
#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Security;

namespace Siemens.Engineering.SW.Blocks
{
    //
    // Summary:
    //     Group containing Plc system blocks & Plc system block groups
    [DebuggerNonUserCode]
    [SecuritySafeCritical]
    public sealed class PlcSystemBlockGroup : IEngineeringObject, IEngineeringCompositionOrObject, IEngineeringInstance, IInternalObjectAccess, IInternalInstanceAccess, IInternalBaseAccess, IEquatable<object>
    {
        //
        // Summary:
        //     Composition of Plc system blocks
        public PlcBlockComposition Blocks { get; }
        //
        // Summary:
        //     Composition of Plc system block groups
        public PlcSystemBlockGroupComposition Groups { get; }
        //
        // Summary:
        //     EOM parent of this object
        public IEngineeringObject Parent { get; }
        //
        // Summary:
        //     The name of the Plc system block group
        public string Name { get; }

        //
        // Summary:
        //     Determines whether the specified System.Object is equal to this instance.
        //
        // Parameters:
        //   obj:
        //     The System.Object to compare with this instance.
        //
        // Returns:
        //     true if the specified System.Object is equal to this instance; otherwise, false.
        [SecuritySafeCritical]
        public override bool Equals(object obj);
        //
        // Summary:
        //     Gets a list of attributes for the given names.
        //
        // Parameters:
        //   names:
        //     The names of the attributes to get.
        //
        // Returns:
        //     A list of the attributes for the given names with nulls for names not found.
        [SecuritySafeCritical]
        public IList<object> GetAttributes(IEnumerable<string> names);
        //
        // Summary:
        //     Returns a hash code for this instance.
        //
        // Returns:
        //     A hash code for this instance, suitable for use in hashing algorithms and data
        //     structures like a hash table.
        [SecuritySafeCritical]
        public override int GetHashCode();
        //
        // Summary:
        //     Sets a list of values for the given attributes.
        //
        // Parameters:
        //   attributes:
        //     The attributes value list.
        [SecuritySafeCritical]
        public void SetAttributes(IEnumerable<KeyValuePair<string, object>> attributes);
        //
        // Summary:
        //     Returns a System.String that represents the current System.Object.
        //
        // Returns:
        //     A System.String that represents the current System.Object.
        [SecuritySafeCritical]
        public override string ToString();
    }
}

构建的对象要满足下列条件，value是{Siemens.Engineering.SW.Blocks.PlcBlockSystemGroup}， type是 object{Siemens.Engineering.SW.Blocks.PlcBlockSystemGroup}

单例需要找到并调用类内实例，在类里面已经声明好了对象且构造函数已经私有化。

    [Serializable]
    public sealed class MySingleton : Singleton<MySingleton>
    {
        public int Value { get; set; }

        private MySingleton()
        {
        }
    }

需要new的类无构造函数或构造函数权限不为private。
看你放出的代码没有构造函数，就是用编译器自动生成的无参构造函数，所以是需要new的。

这个还是同样的问题，没有构造函数无法新建对象。有的对象是只有工厂能制造出来而不是外部能构造的。你的需求都是要不就是从xml构造（叶子结点），要不就是从树上得到（组节点）。