DataContractJsonSerializer：使用接口属性序列化类

发布于 2024-10-24 19:07:01 字数 1097 浏览 2 评论 0原文

我正在尝试序列化这样的类：

[DataContract]
public class GenericFlow 
{
    [DataMember]
    public ISource Source { get; set; }
    [DataMember]
    public IList<IFilter> Filters { get; set; }
}

当我序列化该对象的实例时，一切正常，但如果我尝试反序列化，则会出现错误。我使用 Mono 2.6 进行测试，这是 mono 平台上的错误：

Stacktrace:


Native stacktrace:

    /usr/bin/mono() [0x48563b]
    /usr/bin/mono() [0x4d275f]
    /lib/libpthread.so.0(+0xfb40) [0x7fd5f8d6eb40]
    /usr/bin/mono(mono_object_get_virtual_method+0x174) [0x4f5744]
    /usr/bin/mono() [0x555524]
    [0x41632228]

Debug info from gdb:

如果我从源属性中删除 DataMember 属性，反序列化就会起作用。

查看序列化过程中生成的 json 字符串，我可以看到 Filters 列表中的每个项目都包含一个“__type”属性，该属性指定了实现 IFilter 的具体类。但对于 ISource 类型的属性“Source”，其中缺少属性“__type”，情况并非如此，因此反序列化过程不知道使用哪个具体类来重新创建该属性。

由于我手边没有 Windows 盒子，我不知道这是否是单声道特定问题，或者也许我在这里遗漏了一些东西。

我应该如何告诉 DataContractJsonSerializer 在源属性中包含“__type”属性？

提前致谢，

更新：

再调查一下，现在我可以强制 DataContractJsonSerializer 始终发出类型信息，并调用alwaysEmitTypeInformation=true 的构造函数。但问题仍然存在。有什么想法吗？

原文

I am trying to serialize a Class like this:

[DataContract]
public class GenericFlow 
{
    [DataMember]
    public ISource Source { get; set; }
    [DataMember]
    public IList<IFilter> Filters { get; set; }
}

When i seralize an instance of this object, everything goes right but if i try to deserialize i get an error. I am using Mono 2.6 for my tests, this is the error on the mono platform :

Stacktrace:


Native stacktrace:

    /usr/bin/mono() [0x48563b]
    /usr/bin/mono() [0x4d275f]
    /lib/libpthread.so.0(+0xfb40) [0x7fd5f8d6eb40]
    /usr/bin/mono(mono_object_get_virtual_method+0x174) [0x4f5744]
    /usr/bin/mono() [0x555524]
    [0x41632228]

Debug info from gdb:

If i remove the DataMember Attribute from the Source Property, deserialization works.

Taking a look at the json string produced during serialization, i can see that each item in the Filters list include a "__type" attribute especifing the concrete class that implements IFilter. But this is not true with the property "Source" of type ISource where the property "__type" is missing, so the desarialization process doesnt know which concrete class use to recreate the property.

Since i dont have a windows box handy, i dont know if this is mono specific problem or maybe i am missing something here.

How should i tell DataContractJsonSerializer to include the "__type" attribute in the Source Property?

Thanks in advance,

UPDATE:

Investigating a bit more, now i can force DataContractJsonSerializer to always emit type information calling the constructor with alwaysEmitTypeInformation=true.
But the problem persists. Any ideas?

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