如何用NewtonSoft的Json序列化器替换OData V4默认的Json序列化器? [英] How do I replace the OData V4 default Json Serializer with NewtonSoft's Json Serializer?

问题描述

我有一个包含DynamicObjects列表的类.我有一个单元测试，可以确认Newtonsoft Json Serializer/Deserializer可以正确处理此问题.但是，默认的OData Json序列化器/反序列化器则没有.

I have a class that contains a List of DynamicObjects. I have a unit test that confirms that the Newtonsoft Json Serializer/Deserializer handles this correctly. However, the default OData Json Serializer/Deserializer does not.

我实现了自己的ODataEdmTypeDeserializer，如下所示:

I implemented my own ODataEdmTypeDeserializer like this:

public class JsonODataEdmTypeDeserializer : ODataEdmTypeDeserializer
{
    public JsonODataEdmTypeDeserializer(ODataPayloadKind payloadKind) : base(payloadKind)
    {
    }

    public JsonODataEdmTypeDeserializer(ODataPayloadKind payloadKind, ODataDeserializerProvider deserializerProvider) : base(payloadKind, deserializerProvider)
    {
    }

    public override object Read(ODataMessageReader messageReader, Type type, ODataDeserializerContext readContext)
    {
        var data = readContext.Request.Content.ReadAsStringAsync().Result;

        //Call to the NewtonSoft Deserializer
        var ret = JsonConvert.DeserializeObject(data, type);

        return ret;
    }
}  

连同它的DefaultODataDeserializerProvider:

along with it's DefaultODataDeserializerProvider:

public class JsonODataDeserializerProvider : DefaultODataDeserializerProvider
{
    public override ODataEdmTypeDeserializer GetEdmTypeDeserializer(IEdmTypeReference edmType)
    {
        var kind = GetODataPayloadKind(edmType);

        return new JsonODataEdmTypeDeserializer(kind, this);
    }

    private static ODataPayloadKind GetODataPayloadKind(IEdmTypeReference edmType)
    {
        switch (edmType.TypeKind())
        {
            case EdmTypeKind.Entity:
                return ODataPayloadKind.Entry;
            case EdmTypeKind.Primitive:
            case EdmTypeKind.Complex:
                return ODataPayloadKind.Property;
            case EdmTypeKind.Collection:
                IEdmCollectionTypeReference collectionType = edmType.AsCollection();
                return collectionType.ElementType().IsEntity() ? ODataPayloadKind.Feed : ODataPayloadKind.Collection;
            default:
                return ODataPayloadKind.Entry;
        }
    }
}

这些工作正常，但是当我尝试创建自己的序列化实现时，遇到了一个障碍:

These work correctly, however when I tried to create my own Serialize implementation I ran into a roadblock:

public class JsonODataEntityTypeSerializer : ODataEntityTypeSerializer
{
    public JsonODataEntityTypeSerializer(ODataSerializerProvider serializerProvider)
        : base(serializerProvider)
    {
    }
public override void WriteObject(object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)
    {

    }

当我的控制器试图返回有问题的对象时，会调用

WriteObject，但是我不确定在这里该如何插入Newtonsoft Serializer.我下载了OData源代码并仔细检查了一下，但没有看到需要的钩子.

WriteObject gets called when my controller tries to return the object in question, but I'm not sure what to do here to insert the Newtonsoft Serializer. I downloaded the OData source code and looked through it but I'm not seeing the hooks I need.

推荐答案

您必须创建一个自定义DataWriter，例如NewtonsoftJsonDataWriter:ODataWriter.

You have to create a custom DataWriter, for example NewtonsoftJsonDataWriter:ODataWriter.

在那里看看:在示例中，它是一个实现的Csv编写器，我认为您随后可以使用简单的Json.Convert()覆盖其方法WriteStart，WriteHeader，WriteEntry和WriteEnd.

In the example it's a Csv writer which is implemented, I think you'll then be able to override its methods WriteStart, WriteHeader, WriteEntry and WriteEnd with a simple Json.Convert().

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