Visual studio lost intellisense for Blazor Components

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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[regression] [worked-in:16.3.3]
After updating vs 16.3.3 visual studio gives errors on markup.
Example "Found markup element with unexpected name "EditForm". If this is intended to be a component, add a using directive for its namespace.

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Original Comments

Visual Studio Feedback System on 10/9/2019, 11:31 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Visual Studio Feedback System on 10/23/2019, 07:02 PM:

This issue is currently being investigated. Our team will get back to you if either more information is needed, a workaround is available, or the issue is resolved.

Georgi Petrov Yaramov on 11/8/2019, 01:58 PM:

Same happened in VS 16.3.8

Melvin C Wiley on 11/23/2019, 02:38 PM:

Same happened in VS 16.3.10

Melvin C Wiley on 11/26/2019, 05:26 AM:

This also happens in VS2019 16.4 Preview 6. This appears to be a problem with intellisense. Is this being looked into? Is there a patch to fix this?

Aaron Mckee on 12/5/2019, 11:37 AM:

Its like using notepad to develop again... please fix!

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Original Solutions

Georgi Petrov Yaramov solved on 11/8/2019, 01:59 PM, 0 votes:

Same happened on VS 16.3.8

[mkArtakMSFT]

Thank you for filing this issue. In order for us to investigate this issue, please provide a minimalistic repro project (ideally a GitHub repo) that illustrates the problem.

[mkArtakMSFT]

It looks like you're using older version of VS. Please upgrade to the latest released version (16.4) and it should be fixed there.

[roxas0zero]

this issue happened to me on VS 16.4.2 I fixed it by restarting VS, you may wanna make sure that it's completely fixed...

[YairHalberstadt]

I can confirm this is occuring on 16.5 preview 1

[wmgdev]

Issue on vs 16.4.3
If I add a Component.razor via Add>New Item>Razor Component intellisense seems to be OK
If I copy, paste then rename an existing Component.razor to e.g. ComponentX.razor intellisense does not pick up the file rename and instead picks up <Component__Copy>

However, If I open the new file in the editor it works

Restarting VS also fixes it

[rogierhofboer]

Same here with VS 16.5.0 Preview 2.0
After creating the default template project, Intellisense for the components doesn't work.
(SurveyPrompt, NavMenu etc.)
Restarting VS fixes it. Please re-open this issue.

[mayur-ekbote]

The problem still exists. This is how you can reproduce: Create a blazor component. Rename it through rename option in solution explorer. The editor cannot find the class and the build does not go ahead.

[mkArtakMSFT]

Reopening as this seems to be impacting many people.
@NTaylorMullen can you please look into this? Thanks!

[poco1980]

Also This issue exist in VS code

[NTaylorMullen]

Also This issue exist in VS code

Would you mind doing the "Report a Razor issue"command and pasting the output here (In addition to manually copying the OmniSharp Log's?

[jshovan]

I had this problem with 16.4.6. Realizing this is in the preview I installed the preview version of VS (16.5.0 Preview 5.0) and at first glance, it seems to be working. I have not done much with it yet but at least I am not getting the red underlines and warning on valid code/markup.

[talldaniel]

I have this problem too. Sometimes only one or two errors, but today there are 117 prompting me to look for a solution.
It still compiles and runs, but when I get a real error, it makes it more difficult to find.