parsing dictionary of objects in c# Dictionary<string,object> data

Question

I am passing following json in request body

{
  "areaId": "1",
  "cat": "2",
  "subcat": "41",
  "location": "1100",
  "sublocation": "11001",
  "briefDescription": "thissss is brief description",
  "detailedDescription": "this is detailed obj",
  "images": {
    "image1": "base64 string",
    "image2": "base64 string"
  }
}

and my handler looks like this

[HttpPost]
public HttpResponseMessage Post(Dictionary<string,object> data)
{
    int areaId = Int32.Parse(data["areaId"].ToString()); //this is how i am getting area from it 

    return Request.CreateResponse(HttpStatusCode.OK, new { some objects to return });
}

how can I extract the images from this json in a dictionary? and what will be the efficient way of doing this

Are you asking how to get the image data from the base64 string or how to access the image1 and image2 fields? — Matt Hogan-Jones
– Matt Hogan-Jones, Commented Dec 7, 2017 at 9:55
Why are you using a Dictionary? You should be binding to an object containing properties that match the data you sending — user3559349
– user3559349, Commented Dec 7, 2017 at 9:55
how to access the image 1 and 2 actually images can be multiple so I want to loop over them @MattJones — Saim Abdullah
– Saim Abdullah, Commented Dec 7, 2017 at 9:57

Fortega · Accepted Answer · 2017-12-07 10:09:33Z

3

As this is a JSON object, you could use a C# JSON Library, such as JSON.Net

You can use the 'Paste JSON as classes' functionality of Visual Studio to get the class structure:

public class Rootobject
{
    public string areaId { get; set; }
    public string cat { get; set; }
    public string subcat { get; set; }
    public string location { get; set; }
    public string sublocation { get; set; }
    public string briefDescription { get; set; }
    public string detailedDescription { get; set; }
    public Images images { get; set; }
}

public class Images
{
    public string image1 { get; set; }
    public string image2 { get; set; }
}

And then use the JsonConvert.DeserializeObject method to deserialize the json to a 'RootObject' instance

If you want to treat the images as a dictionary, the following structure should also work with json.net:

public class Rootobject
{
    public string areaId { get; set; }
    public string cat { get; set; }
    public string subcat { get; set; }
    public string location { get; set; }
    public string sublocation { get; set; }
    public string briefDescription { get; set; }
    public string detailedDescription { get; set; }
    public Dictionary<string, string> images { get; set; }
}

Check https://www.newtonsoft.com/json/help/html/DeserializeDictionary.htm

edited Dec 7, 2017 at 10:09

answered Dec 7, 2017 at 9:57

Fortega

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3 Comments

Saim Abdullah Over a year ago

How can I handle multiple images with this approach?

Saim Abdullah Over a year ago

now I completely understand how things will work, but I have a question thy why it is necessary that we will add a new class like (RootObject) every time (for different different kind of objects),,,,,,Is there not any generic way that we simply sniff the parameters from request object and use them?

Magnetron Over a year ago

@SaimAbdullahCh, it's not necessary, that's the serialize/deserialize approach. You could also use Linq to Json

Magnetron · Accepted Answer · 2017-12-07 10:37:53Z

1

If you want to use the Linq to Json approach, you could do as follow:

JObject o = JObject.Parse(j);
Dictionary<string, string> images = new Dictionary<string, string>();
foreach(JProperty im in o["images"])
{
    images.Add(im.Name, (string)im.Value);
}

where j is a string containing your JSON.

answered Dec 7, 2017 at 10:37

Magnetron

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