Aspnetcore.docs: Variable parameters

[regul4rj0hn]

How would you do this using the new <partial /> tags:

@foreach (var scope in Model.ResourceScopes)
{
  @Html.Partial("_ScopeListItem", scope)
}

The _ScopeListItem partial takes a ScopeViewModel of course, but I need to pass the specific one in the for loop, not just any "ScopeViewModel". If I am understanding the post correctly, are we now forced to do this using [ViewData]?

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• ID: fa4c23ba-19f6-d847-fefa-a61e283d5fde
• Version Independent ID: e7df465a-5f3b-1522-b2d9-5e3afbf74257
• Content: Partial Tag Helper in ASP.NET Core
• Content Source: aspnetcore/mvc/views/tag-helpers/built-in/partial-tag-helper.md
• Product: aspnet-core
• GitHub Login: @scottaddie
• Microsoft Alias: scaddie

[regul4rj0hn]

Nevermind. My apologies, missed the @ on the scopes variable. Duh.

[scottaddie]

@regul4rj0hn I'll add a "Migrate from HTML Helpers" section to the doc, as I'm sure others are curious too. In your case, you'll want to use the following:

@foreach (var scope in Model.ResourceScopes)
{
    <partial name="_ScopeListItem" model="scope" />
}

Also note that you gain the benefit of asynchronous loading of the partial view when using the Partial Tag Helper.

[regul4rj0hn]

Yep, that might help people. It would actually look like this to get it to compile:

@foreach (var scope in Model.ResourceScopes)
{
    <partial name="_ScopeListItem" model="@scope" />
}

Otherwise, it looks for "scope" inside the current @model tagged for the view, instead of passing in the foreach variable.
Good to know about the async load, thanks!

[scottaddie]

@regul4rj0hn It compiles and works for me without the @ symbol before scope. If you run dotnet --version, what's the version number returned? Also, which version of VS are you using?

[regul4rj0hn]

> dotnet --version
> 2.1.301

VS Professional v17.7.4
https://imgur.com/ufby9ow
Maybe something to do with ResourceScopes being IEnumerable<Scope>? what are you iterating over?

[scottaddie]

@regul4rj0hn I see the issue. You're assigning scope to the for attribute instead of the model attribute.

[regul4rj0hn]

Whoops! You are absolutely correct, that happens when you take a shortcut, and do a find and replace on the @Html.Partial tag across your project to "migrate to 2.1 faster". Thanks for spotting the oversight. I should point out that the other (incorrect) form of for="@scope" also works just fine, though.
Thanks a lot for your help, Scott!