C# MVC4 Web API - Resulting JSON should return objects instead of $ref to object

问题

I have an ASP.NET MVC 4 Web API app using EntityFramework for ORM.

In the JSON I return, there are some cases where the same child node is present for multiple parent nodes. In these cases, the first occurrence of the child node is fully visible with all it's members. Any subsequent occurrence shows up as a $ref to the first occurrence. I'd like instead to see the full object everytime it shows up in the JSON returned.

For example, instead of seeing:

    [{
    "$id": "1",
    "userId": 1,
    "Badge": {
        "$id": "2",
        "badgeId": 1,
        "badgeName": "Gold"
        }
    }, {
    "$id": "3",
    "userId": 2,
    "Badge": {
        "$ref": "2"
        }
    }]

i'd like to see:

    [{
    "$id": "1",
    "userId": 1,
    "Badge": {
        "$id": "2",
        "badgeId": 1,
        "badgeName": "Gold"
        }
    }, {
    "$id": "3",
    "userId": 2,
    "Badge": {
        "$id": "4",
        "badgeId": 1,
        "badgeName": "Gold"
        }
    }]

Basically I want to get rid of any "$ref" in the JSON. Is there a way?

Thanks!

回答1:

An easy way is to edit the generated entity classes code. For each of the entity classes, there will be a [DataContract(IsReference=true)] attribute assigned.

Something like the following:

[EdmEntityTypeAttribute(NamespaceName="YourNamespace", Name="YourEntity")]
[Serializable()]
[DataContractAttribute(IsReference=true)]
public partial class YourEntity : EntityObject
{

Change it to IsReference=false. That should do the trick.

回答2:

In my case, I'm using the Entity model, I simply set an entity key for a unique field in my .edmx diagram table.

来源：https://stackoverflow.com/questions/11237540/c-sharp-mvc4-web-api-resulting-json-should-return-objects-instead-of-ref-to-o