序列化表达式树 [英] Serialize expression tree

问题描述

我正在用c#开发分布式系统，遇到了障碍.

I'm doing a distributed system in c# and have encountered a barrier.

我需要能够序列化类型的谓词

I need to be able to serialize Predicate with type

Predicate<ICollection<IEntity>> p = (entities => entities.OfType<Person>().Count() <= 3);

我相信在.net中这是不可能的，所以我的问题是是否存在任何可以解决问题的框架.

I belive this is not possible in .net so my question is if there exists any frameworks that can do the trick.

我已经尝试了两个框架，但是一直遇到这样的问题:它们无法序列化需要集合或列表的谓词

I've already tried a couple of frameworks, but keep running into the problem that their are not able to serialize predicates that takes a collection or list

希望任何人都知道解决方案.已经被这个问题困扰了几个星期了...

Hope anyone knows a solution. Have been stuck with this problem for a couple of weeks now...

推荐答案

我的解决方案:

让问题搁置了很长时间后，终于可以使用json.net和Aq.ExpressionJsonSerializer( https://github.com/aquilae/expression-json-serializer )

After putting the issue to rest for a long time a finally managed to solve my problem using json.net and Aq.ExpressionJsonSerializer (https://github.com/aquilae/expression-json-serializer)

public class JsonNetAdapter : IOconSerializer
{
    private readonly JsonSerializerSettings _settings;

    public JsonNetAdapter(JsonSerializerSettings settings = null)
    {
        var defaultSettings = new JsonSerializerSettings {TypeNameHandling = TypeNameHandling.Objects};
        defaultSettings.Converters.Add(new ExpressionJsonConverter(Assembly.GetAssembly(typeof(IOconSituation))));
        _settings = settings ?? defaultSettings;
    }

    public string Serialize<T>(T obj)
    {
        return JsonConvert.SerializeObject(obj, _settings);
    }

    public T Deserialize<T>(string json)
    {
        return JsonConvert.DeserializeObject<T>(json, _settings);
    }
}

像魅力一样工作！

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