Errors/Warnings show up on "Error List" but then disappear for website project

Question

BACKGROUND

I have inherited a solution with multiple projects. One of the projects is a website project... or at least I'm pretty sure that's what this icon means (It looks pretty different in VS 2010 vs 2013, so I'm showing both: VS 2013 on the left, VS 2010 on the right):

PROBLEM

When I rebuild the website project, there are 8 warnings that are generated. These correctly show up in the Error List, but only for a moment.

Once the build process finishes, they disappear.

There are a few things to note:

1. There are no filters set and I cannot toggle any of the message types because it says there are 0 of each.

2. Even though the errors have disappeared from my Error List, they do still show up in the output section

3. Warnings and errors from other projects show up in the error list without any of this weirdness

4. This is a website project, so the property pages are dramatically different than the ones that I'm familiar with.

5. I've observed the same behavior with errors

I've tried different versions of VS and they both do the same thing. I've tried deleting my .suo file. I've played around with all the settings I can find that look at all relevant but nothing changes this behavior.

What am I missing?

Incontrollable

I'm getting the same problem. Did you ever discover a solution? – Life

Nope, afraid not. I'm still curious to know the answer, but I've moved on to another project now. – Incontrollable

I've also observed this vanishing-error annoyance in C++ projects, and in all recent versions of VS. The top answer, hiding IntelliSense issues, solved my problem. – Counteract

Answer 1

I had this problem this morning. After a few minutes of fiddling around, I managed to correct it by switching the "Show issues generated" combo box from "Build + IntelliSense" to "Build Only".

I appreciate this quite a subjective answer, and it may be that this solution doesn't work for you, but I suspect it may help to steer you on the right direction!

FYI, my symptoms were: The error list would show for 1-2 seconds after having built or pressed "Start", and then disappear showing 0 errors

Nevile

This definitely keep the error message for me, however, it was only an ancillary error caused by another error only available in the output. Still, this solved the disappearing error problem. – Algorithm

I don't understand. How is hiding the error message solving the problem? – Nereid

Under Error list, select "Entire solution" instead of "Open Documents" (as done by Ben Hayward) – Hanschen

@JensMander You are right in a way, it doesn't. But in my case I have an old ASP.net website with almost 1600 errors in about 40 different files. To make them all disappear, I would need to open them one by one and wait 5 seconds. And this would only help until I change some code and then it all comes back. So, for me, it is a huge help. If you have figured out a better solution, please let me know, I am also still looking for a better solution. – Impeach

Answer 2

My issue was that I was importing a reference of the class library project which was built with .NET 4.52 version and I had .NET 4.5 version. So I switched the .NET version of the class library to .NET 4.5 and the problem was solved. Error messages didn't show this problem, but output window was displaying this error message.

Lozoya

Answer 3

Perhaps this warnings is comming from code analysis, try to run only code analysis on your solution.

Cerys

I have done that and the errors are totally different. THEY actually DO show up in the error list window. – Incontrollable