How to use View components in Visual Studio 17.5.0 with .NET 7.0.200 in Linux

Question

How to use View components in Visual Studio 17.5.0 with .NET 7.0.200 in Linux

Andrus 121

ASP .NET 7 MVC core application uses view commponents in Razor Views like in _Layout.chtml


    <vc:producttree roott="ProductTreeRoot">
    </vc:producttree>

After upgrading Visual Studio from 17.4.5 to 17.5.0 and deploying application to Linux
view components are no more rendered. Markup in browser contains same <vc:producttree> element.
If application in running from VS IDE in windows, markup contains proper html.


If Visual Studio is reverted back to 17.4.5 and older net runtime in forced in global.js using

     {   "sdk": {
         "version": "7.0.103",
         "rollForward": "disable"   }
     }

view components are rendered in Linux also.
How to use views components in with .NET 7.0.200 and Visual Studio 17.5.0 ?

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Answer 1

Xinran Shen - MSFT 2,091

Hi @Andrus,

This is a known issue that occurs in .Net 7.0.200 and Visual Studio 17.5.0, If you don't want to use older net runtime, you can use:

@await Component.InvokeAsync("xxxx")

to render view component.

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Xinran Shen

Andrus 121 Reputation points

2023-02-23T13:46:15.31+00:00

When using a ModelExpression parameter this method cannot be used as they only work with the tag helper.

public async Task<IViewComponentResult> InvokeAsync(ModelExpression model, string pageCode, bool debug = false)

How to use it in .Net 7.0.200 ?
Xinran Shen - MSFT 2,091 Reputation points

2023-02-24T02:14:19.2166667+00:00

Hi @Andrus, Sorry sir, Because ModelExpression parameter can only work with the tag helper, So I am afraid you can only use tag helper with older .Net runtime to achieve it until this issue has been fixed.
Jeff Sinclair 0 Reputation points

2023-02-25T07:29:30.8933333+00:00

Hi,
I had the same problem and converted over to directly invoking the components, as opposed to the broken tag helper <vc:

This doco was useful :

https://learn.microsoft.com/en-us/aspnet/core/mvc/views/view-components?view=aspnetcore-7.0#invoke-a-view-component

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How to use View components in Visual Studio 17.5.0 with .NET 7.0.200 in Linux

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