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How to load partial razor page into razor view

user2188 Published in June 22, 2018, 11:30 am

I am trying to replace my view components with razor pages but it seems that it's not possible to load a partial razor page because a model is expected to be passed yet it is my understanding that the model for a razor page should be declared in the OnGetAsync method. Here is my code...

Razor Page

@page "{id:int}"
@model _BackgroundModel

<form method="POST">
    <div>Name: <input asp-for="Description" /></div>
    <input type="submit" />

Razor Page Code-Behind

public class _BackgroundModel : PageModel
    private readonly IDataClient _dataClient;

    public _BackgroundModel(IDataClient dataClient)
        _dataClient = dataClient;

    public BackgroundDataModel Background { get; set; }

    public async Task OnGetAsync(int id)
        Background = await _dataClient.GetBackground(id);

    public async Task OnPostAsync()
        if (ModelState.IsValid)
            await _dataClient.PostBackground(Background);


Razor View

<div class="tab-pane fade" id="client-background-tab">
    <div class="row">
        <div class="col-sm-12">
            @await Html.PartialAsync("/Pages/Client/_Background.cshtml", new { id = 1 })

Page Load Error

InvalidOperationException: The model item passed into the ViewDataDictionary is of type '<>f__AnonymousType0`1[System.Int32]', but this ViewDataDictionary instance requires a model item of type 'WebApp.Pages.Client._BackgroundModel'

In this example (as per MS recommended approach in their docs) the model is set inside the OnGetAsync method which should be run when the page is requested. I have also tried @await Html.RenderPartialAsync("/Pages/Client/_Background.cshtml", new { id = 1 }) but the same error result.

How can I load the razor page into my existing view?

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