很久以前我也有同样的问题。对我来说，在大量的谷歌搜索之后，唯一真实的的解决方案是序列化和反序列化它。这不是一个糟糕的解决方案，你只会损失一点点性能，就像这样做：
将此标记添加到您的类：

[Serializable()]
public class a
{

}

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然后你可以创建一个这样的函数：

public object Clone()
{
    IO.MemoryStream mem = new IO.MemoryStream();
    System.Runtime.Serialization.Formatters.Binary.BinaryFormatter form = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
    form.Serialize(mem, this);
    mem.Position = 0;
    return form.Deserialize(mem);
}

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如果您需要一个浅克隆，只需使用Object.MemberwiseClone。如果你需要一个深度克隆，序列化然后反序列化你的对象（例如使用JsonSerializer）。

这将起作用，并且可能比序列化方法更快：

验证码：

using System;

namespace Cloning
{
    class Program
    {
        static void Main(string[] args)
        {
            Derived d = new Derived() { property = 1, field = 2, derivedProperty = 3, derivedField = 4 };
            Base b = new Derived(d);

            // Change things in the derived class.
            d.property = 5;
            d.field = 6;
            d.derivedProperty = 7;
            d.derivedField = 8;

            // Output the copy so you know it's not shallow.
            Console.WriteLine((b as Derived).property);
            Console.WriteLine((b as Derived).field);
            Console.WriteLine((b as Derived).derivedProperty);
            Console.WriteLine((b as Derived).derivedField);

            Console.ReadLine();
        }

        class Base
        {
            public int property { get; set; }
            public int field;
        }

        class Derived : Base
        {
            public Derived() { }

            public Derived(Derived d)
            {
                // Perform the deep copy here.
                // Using reflection should work, but explicitly stating them definitely
                // will, and it's not like it's not all known until runtime.
                this.property = d.property;
                this.field = d.field;
                this.derivedProperty = d.derivedProperty;
                this.derivedField = d.derivedField;
            }

            public int derivedProperty { get; set; }
            public int derivedField;
        }

    }
}

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测试：

http://goo.gl/pQnAL

输出：

1
2
3
4

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备注：

我真的可以想象，这将工作在不仅仅是一个微不足道的情况下，但也许不是：

public static T CloneFieldsAndProperties<T>(T input)
{
    T result = (T)Activator.CreateInstance(input.GetType());

    PropertyInfo[] properties = input.GetType().GetProperties();
    FieldInfo[] fields = input.GetType().GetFields();

    foreach (PropertyInfo property in properties)
        property.SetValue(result, property.GetValue(input, null), null);
    foreach (FieldInfo field in fields)
        field.SetValue(result, field.GetValue(input));

    return result;
}

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