Wcf server & Entity Framework problems

Question

I have been trying a lot to return a json response from wcf restful service using ef entities as source, when I came to know that the it is not possible to do it with the integrated libraries. So after some 3rd party library googling I came to know about Json.net library, which is able to handle EF entities. So far so good, the library works and does its job perfectly. But then I faced the problem of re-serialization of the object serialized previously with Json.net library, because when I was returning it the visual studio integrated library was serializing again, so I kept getting some malformed json in output, containing some back slashes ( \ ). Then finally I found a method to return the serialized json string avoiding 2nd serialization, with the following method:

public Message GetProblems()
{
    using (MojDBEntities context = new MojDBEntities())
    {
        //not a good solution, but ok, till I find a better one
        context.ContextOptions.LazyLoadingEnabled = false;
        var temp = context.Problems.ToList();
        var serializedObject = JsonConvert.SerializeObject(temp);
        return WebOperationContext.Current.CreateTextResponse (serializedObject,
        "application/json; charset=utf-8",
        Encoding.UTF8);
    }
}

and it works. The problem is that I don't want to return just the actual json data, but as well another field called status, which will tell me whether the response is correctly completed( e.g. status = 0 means ok, so i can proceed to take the actual json data). How to accomplish this?

CodeCaster · Accepted Answer · 2014-02-27 13:41:16Z

1

Something like this?

var response = new 
{
    status = 0,
    data = temp
};

var serializedObject = JsonConvert.SerializeObject(response);   

return WebOperationContext.Current.CreateTextResponse(serializedObject);

But you should rely on HTTP for the status code, not the response message itself.

answered Feb 27, 2014 at 13:41

CodeCaster

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3 Comments

NiVeR Over a year ago

That did it, thank you. I was asked to produce kind of "Uniform Response" from all my methods in the service, and I thought of something like this. Can you suggest me how I could involve the http status code checking in my case ?

CodeCaster Over a year ago

I can't see what you're trying to do, but you can consider returning an HTTP error (like 409 Conflict if applicable).

NiVeR Over a year ago

I am building a restful wcf service, that I will later consume from android client.

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