How to Invoke ViewComponents from View in ASP.NET MVC?

Question

I am trying to Invoke Components from inside the view, but keep getting errors. And online I can only find examples working with ASP.NET Core, but I am not using Core.

This is my View:

@model BeestjeOpJeFeestje.Models.BoekingProces

<h2>Boeken</h2>
<hr />
<div class="row">
    <div class="col col-9" style="padding: 0">
        @switch (Model.Boeking.BoekingStatus)
        {
            case BeestjeOpJeFeestje.Models.BoekingStatus.Beestjes:
                if (TempData["error"] != null)
                {
                    <span class="text-danger">@TempData["error"]</span>
                }
                @await Component.InvokeAsync("BeestjesKiezen", @Model);
                break;
            case BeestjeOpJeFeestje.Models.BoekingStatus.Accessoires:
                @await Component.InvokeAsync("AccessoiresKiezen", @Model);
                break;
            case BeestjeOpJeFeestje.Models.BoekingStatus.Informatie:
                @await Component.InvokeAsync("Klantgegevens", @Model);
                break;
            case BeestjeOpJeFeestje.Models.BoekingStatus.Bevestiging:
                @await Component.InvokeAsync("Bevestiging", @Model);
                break;
        }
    </div>
    <div class="col col-3">
        @await Component.InvokeAsync("BookingDetail", @Model)
    </div>
</div>

But it results in the errors that 'await' and 'Component' not exists in the current context.

Can someone maybe help me with the correct syntax? Thanks in advance.

When I Try it without the @ The Component error stays the same. And the await errors becomes: 'The 'await operator can only be used within an async method...'' — Marcel
– Marcel, Commented Mar 11, 2020 at 18:55
Are you referencing static class Component with using, because I don't see it in your code. — Adlorem
– Adlorem, Commented Mar 11, 2020 at 20:15
No I do not. But I am not really sure why this isn't working. I have this exact code in a Core project and there it is working fine. Could it be that it just is not possible in ASP.NET MVC? — Marcel
– Marcel, Commented Mar 11, 2020 at 20:59

Jerdine Sabio · Accepted Answer · 2020-03-12 02:29:53Z

1

This question has been answered before, the Component Static class is not available in ASP.NET MVC. It is only available with Core; Asp.net mvc compiler error when trying to invoke View Component from view page

It is mentioned in the documentation that it is similar to a partial view, hence use that instead. But this won't have the asynchronous feature, the server will always wait for this rendering to finish before proceeding.

@{
    Html.RenderPartial("BeestjesKiezen", Model);
}

Meanwhile, rendering parts of your page asynchronously can be done via ajax/jquery. See the answer here; How to render a partial view asynchronously

answered Mar 12, 2020 at 2:29

Jerdine Sabio

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1 Comment

Marcel Over a year ago

I couldn't figure the async loading out, so i went ahead an made everything synchronous. It all works fine now.

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