CODEWITHSUNDEEP
jsonasp.net-mvc-4asp.net-web-api
Eric
Eric

Reputation: 3257

Can't parse JSON parameter

I am using WebAPI to get the POST message. The body of the POST message: {"datetime":"2017-01-06T20:40:44.2401244Z","filename":"somefilename.csv","datasourcename":"MyDataSource","error":"The uploaded file has no tags."}

The header included with the POST: Content-type: application/json

My action method that handle the message: [HttpPost]

public void SaveMessage([FromBody] string msg)
{ 
    MyModel w = JsonConvert.DeserializeObject<MyModel>(msg);
    db.MyModels.Add(w);
    db.SaveChanges();
}

My question is how do I encode the JSON so that I can parse it? I can't change the incoming message. What can I do in my method so that I can read it? Right now msg always give me null.

Upvotes: 0

Views: 703

Answers (1)

Nkosi
Nkosi

Reputation: 247631

Given that you have no control over the data being sent, then as suggested in the comments, make sure you have a model that matches the desired object model of the JSON

public class MyModel {
    public DateTime datetime { get; set; }
    public string filename { get; set; }
    public string datasourcename { get; set; }
    public string error { get; set; }
}

And take advantage of the model binding capability of the Web API framework and let the action bind a strongly typed model from the body of the request.

[HttpPost]
public IHttpActionResult SaveMessage([FromBody] MyModel model) {
    if(ModelState.IsValid) {
        db.MyModels.Add(w);
        if(db.SaveChanges() > 0)
            return Ok();
    }
    return BadRequest();
}

If there are any issues with saving the message the action will return HTTP Status Code 400 Bad Request, otherwise it will return HTTP Status Code 200 OK.

Upvotes: 3

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