Render partial view to string with grid

[nicolas]

Hi,

I have to render my partial view in html string (in controller), to return json object.

I found this function that works very well :

01.public static String RenderViewToString(ControllerContext context, String viewPath, object model = null)
02.        {
03.            context.Controller.ViewData.Model = model;
04.            using (var sw = new StringWriter())
05.            {
06.                //var viewResult = ViewEngines.Engines.FindView(context, viewPath, null);
07.                var viewResult = ViewEngines.Engines.FindPartialView(context, viewPath);
08.                var viewContext = new ViewContext(context, viewResult.View, context.Controller.ViewData, context.Controller.TempData, sw);
09.                viewResult.View.Render(viewContext, sw);
10.                viewResult.ViewEngine.ReleaseView(context, viewResult.View);
11.                return sw.GetStringBuilder().ToString();
12.            }
13.        }

 

With a kendo grid in partial view, i'm getting a "System.NullReferenceException" on the declaration  @(Html.Kendo().Grid(.....

If I return the view with a "Return view" in my controller, it's ok.

 

My grid:

01.@(Html.Kendo().Grid((IEnumerable<MAGI.Model.DigicodeImmeuble>)mvDigicode)
02.        .Name("gridSyntheseDigicode")
03.        .HtmlAttributes(new { style = "width:100%;height: auto;", @class = "k-grid_encart k-grid_nopage" })
04.        .Columns(t =>
05.            {
06.                t.Bound(c => c.Digicode1.Nom).Title(tabTraduction[701972] + " 1");
07.                t.Bound(c => c.Digicode1.NoDigicode).Title(tabTraduction[100620]);
08.                t.Bound(c => c.Digicode2.Nom).Title(tabTraduction[701972] + " 2");
09.                t.Bound(c => c.Digicode2.NoDigicode).Title(tabTraduction[100620]);
10.            }
11.        )
12.        .Sortable()
13.        .Selectable()
14.        .DataSource(dataSource => dataSource
15.            .Ajax()
16.            .ServerOperation(false)
17.        )
18.        .Reorderable(reorder => reorder.Columns(true))
19.        .Events(events => events.DataBound("onDataBoundGridStandard"))
20.    )

 

mvDigicode and tabTraduction are not null. 

 

That's work with the kendo chart module.

What's wrong with the grid ?

 

Many thanks, 

 




 

06.                var viewResult = ViewEngines.Engines.FindPartialView(context, viewPath);

[Nikolay Rusev]

Hello Nicolas,

 

We are not sure what might cause this error in the described scenario. We will need a isolated runnable example in order to assist you further.

 

Regards,
Nikolay Rusev
Telerik

[nicolas]

Hello Nikolay,

When I created the isolated example, i worked great.
So I searched differences between the isolated and my application, and found that this is the Task object in controller that causes the error.

Maybe the "await Task.WhenAll()" is not completed when I want to render the view ?

When I render my view, I don't need the task so it's "resolved". But if you still want a isolated example, I can send you it.

Regards,

[Nikolay Rusev]

Hello Nicolas,

 

I'm not sure how the Task is used in this case. Does this scenario work with other MVC widgets?

We will need a runnable example of the scenario showing the exception.

 

Looking forward to hearing from you.

 

Regards,
Nikolay Rusev
Telerik