ASP MVC 5 How to read object from request with the help of JSON NET

Question

I need to use JSON NET serializer.

SiteModelBinder

internal class SiteModelBinder : System.Web.Mvc.IModelBinder
{
    public object BindModel(ControllerContext controllerContext, System.Web.Mvc.ModelBindingContext bindingContext)
    {
        // use Json.NET to deserialize the incoming Position
        controllerContext.HttpContext.Request.InputStream.Position = 0; // see: http://stackoverflow.com/a/3468653/331281
        Stream stream = controllerContext.RequestContext.HttpContext.Request.InputStream;
        var readStream = new StreamReader(stream, Encoding.UTF8);
        string json = readStream.ReadToEnd();
        return JsonConvert.DeserializeObject<Site>(json, new JsonBuildBlockConverter());
    }
}

Here I get an exeception unrecognized character at position 0,0

        return JsonConvert.DeserializeObject<Site>(json, new JsonBuildBlockConverter());

ajax call

$.ajax({
        url: '/Site/Update',
        data: { site: getSite() },
        contentType: 'application/json',
        method: 'POST',
        success: function (data) {
            console.log('Success save');
        },
        error: function (data) {
            debugBox(data);
        }
    });

and mvc action, BTW BuildBlocks property is of type List<AbstractBuildBlock> and TextBlock is derived.

public string Update(Site site)
    {
        //the goal to see in debugger that block is not null after the next line
        TextBlock block = site.Pages[0].Rows[0].BuildBlocks[0] as TextBlock;
        //siteRepository.Add(site);
        return "Success";
    }

What I miss or doing wrong?

What is the value of your string json variable at the point that the exception is thrown? — darth_phoenixx
– darth_phoenixx, Commented Aug 13, 2016 at 21:40
@darth_phoenixx site%5BsortedPages%5D%5B0%5D%5BsortedRows%5D=&site%5BsortedPages ...and such style to the end — Nikita
– Nikita, Commented Aug 13, 2016 at 21:42
In the creation of the StreamReader you specify Encoding.UTF8 - as far as msdn.microsoft.com/de-de/library/… the BOM is expected. Perhaps your ajax call posts data in a different encoding. Perhaps new StreamReader(stream, true) works. — Ralf Bönning
– Ralf Bönning, Commented Aug 13, 2016 at 21:45
I think you should have dataType: 'json' in your ajax post. It's passing it as serialized form data instead by the look of it. — darth_phoenixx
– darth_phoenixx, Commented Aug 13, 2016 at 21:46
@rboe It not work( I try add charset=utf-8 to contentType, and check both variants with True and Encoding.UTF8 both give the same result as was at start. Thank for comment. — Nikita
– Nikita, Commented Aug 13, 2016 at 22:00

Nikita · Accepted Answer · 2016-08-14 16:04:24Z

0

correct ajax call

$.ajax({ 
        type: "POST",
        url: "/Site/Update",
        dataType: "json", 
        data: {JSON.stringify(filtersData) }, //without name because I'll use custom ModelBinder
        contentType: "application/json; charset=utf-8", 
        traditional: true,
        success: function (data) { 
            alert("ok"); 
        },
        error:function (xhr, ajaxOptions, thrownError) { 
            alert(xhr.status); 
            alert(thrownError); 
        }
    });

answered Aug 14, 2016 at 16:04

Nikita

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