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Union  联合

MessagePack for C# 支持序列化接口类型和抽象类类型的对象。它的行为类似于 XmlInclude 或 ProtoInclude。在 MessagePack for C# 中，这些被称为Union。只有接口和抽象类可以被 Union 属性注解。需要唯一的联合键。

/****************************************************文件：Test_05.cs作者：Edision日期：#CreateTime#功能：示例5:Union
*****************************************************/using MessagePack;
using UnityEngine;public class Test_05 : MonoBehaviour
{public void Test(){//IUnionSample data = new FooClass() { XYZ = 999 };IUnionSample data = new BarClass() { OPQ = "BarClass" };// 序列化接口类型的对象。var bin = MessagePackSerializer.Serialize(data);// 再次反序列化。var reData = MessagePackSerializer.Deserialize<IUnionSample>(bin);// Use with e.g. type-switching in C# 7.0switch (reData){case FooClass x:Debug.Log(x.XYZ);break;case BarClass x:Debug.Log(x.OPQ);break;default:break;}}// 注解继承类型[Union(0, typeof(FooClass))][Union(1, typeof(BarClass))]public interface IUnionSample { }[MessagePackObject]public class FooClass : IUnionSample{[Key(0)]public int XYZ { get; set; }}[MessagePackObject]public class BarClass : IUnionSample{[Key(0)]public string OPQ { get; set; }}
}

联合在内部被序列化为两个元素的数组。

IUnionSample data = new BarClass { OPQ = "FooBar" };var bin = MessagePackSerializer.Serialize(data);// Union is serialized to two-length array, [key, object]
// [1,["FooBar"]]
Console.WriteLine(MessagePackSerializer.ConvertToJson(bin));

抽象类与接口运行方式一样

[Union(0, typeof(SubUnionType1))]
[Union(1, typeof(SubUnionType2))]
[MessagePackObject]
public abstract class ParentUnionType
{[Key(0)]public int MyProperty { get; set; }
}[MessagePackObject]
public class SubUnionType1 : ParentUnionType
{[Key(1)]public int MyProperty1 { get; set; }
}[MessagePackObject]
public class SubUnionType2 : ParentUnionType
{[Key(1)]public int MyProperty2 { get; set; }
}

请注意，你不能在派生类型中重复使用父类型中已经存在的相同键，因为内部将使用一个单一的扁平数组或映射，因此不能有重复的索引/键。