Create a Json object from a list in C# controller

Question

I have been trying to get a Json data defined based on a string list from the Controller MVC c# for quite some time with no luck. I think I am missing something silly, but can you please guide me here?

I have a controller function returning a view with Viewbag assigned as below :

   List<string> Brands;
        Brands = GlobalVariables.Brands.Where(m => m.brand_cd != "OOO" && m.brand_cd.Trim().ToLower().Equals(m.main_brand.Trim().ToLower()))
                 .OrderBy(m => m.brand_cd).Select(m => m.brand_cd.Trim()).Distinct().ToList();



        ViewBag.BrandList = Json(Brands);

And In my view I am trying to define a Json varible as

<script>
    var brandList = '@ViewBag.BrandList';
</script>

But this isnt helping. I get a string in the result. Any ideas ?

'I get a string in the result' - what exactly do you think JSON is? — fdomn-m
– fdomn-m, Commented Dec 18, 2018 at 11:01
Start by removing the ' that makes it a string. You may also need to use Html.Raw - var brandList = @Html.Raw(ViewBag.BrandList); — fdomn-m
– fdomn-m, Commented Dec 18, 2018 at 11:21
Thank you guys, one of our members asked me to do this and it worked like magic. I was not rendering it appropriately in the view file. <script> var brandList = @Html.Raw(Json.Encode(ViewBag.BrandList)); </script> — Jinith
– Jinith, Commented Dec 18, 2018 at 12:42

Alen Genzić · Accepted Answer · 2018-12-18 11:09:12Z

1

You are assigning a JsonResult object and expecting to get a JSON string out, which is not the case.

To get actual JSON into the ViewBag you will need to serialize your object and place it in the ViewBag then.

Example by using the Newtonsoft.Json NuGet package, which is fairly standard:

string myJsonString = JsonConvert.SerializeObject(Brands);
ViewBag.BrandList = myJsonString;

And in the view:

<script>
    var brandList = @ViewBag.BrandList;
</script>

answered Dec 18, 2018 at 11:09

Alen Genzić

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