[When using Resharper] Incremental build not working in MAUI for android target

[KayBeeJayBee]

Description

I have a MAUI application currently running in NET 7. My main workflow is to compile and deploy directly to local android device directly from visual studio. Every time I hit F5 the application compiles and is deployed to the phone within a few seconds.

Today I tried to upgrade the project to target NET 8 and noticed that it takes a very long time to compile and deploy to the phone. Even if there are no changes at all to the code base it seems the application is always rebuilt and this makes it almost impossible to work with.

To rule out that I have some strange things going on in my project I tried to create two new default MAUI applications in Visual studio. One targeting NET 7 and one targeting NET 8 and then I tried to build them in command line a couple of times to see the difference in build time. See image below.

The first build is of course expected to take some time since it is built for the first time but build #2 and #3 should be faster since no changes are made. This works a expected i NET 7 but not in NET 8.

Am I doing something wrong? Are there any new properties that I need to enable to get the same build behaviour as before?

Steps to Reproduce

1. Create a new MAUI project targeting NET 8
2. Build the application for Android. (Should take a minute or so to build)
3. Build it again for Android. (Should only take a couple of seconds since nothing in the code base is changed)

Link to public reproduction project repository

No response

Version with bug

8.0.3

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

7.0.101

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No workaround

Relevant log output

No response

[miki-bgd]

I am experiencing same issues with my project (MAUI ported from .net7 to .net8). I have also tried basic MAUI .net8 project, and it behaves same - each build takes around 1min 30sec, and then 1min more for deployment.

MAUI .net7 was building and deploying quite fast (it was huge improvement compared to XF), and now with these build issues in MAUI .net8 productivity decreases significantly.

Really would like this issue to be addressed, since it is not possible to work in environment where it takes 2-3 min for each debug session.

[PureWeen]

@jonathanpeppers @dellis1972 thoughts?

[jonathanpeppers]

This is not happening for me, or I would have noticed it. Can you attach a .binlog of these incremental builds that are slow?

https://aka.ms/binlog

Adding -bl to the side-by-side .NET 8 and 7 would be helpful.

Hi @KayBeeJayBee. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[miki-bgd]

@jonathanpeppers Hi, here is .binlog from my solution (same problem with slow build with no changes, .net8 ported from .net7).
Hopefully this is useful, but if needed i can try next days to create binlog for .net7 as well.
MAUI_NET8_redacted.zip

[jonathanpeppers]

Is this an incremental build?

Building target "_CompileToDalvik" completely.
Output file "obj\Debug\net8.0-android\stamp\_CompileToDalvik.stamp" does not exist.
...
Task D8 44.803s

This file should exist after the build completes, but this looks like a fresh build.

[miki-bgd]

I have used "MSBuild Structured Log Viewer" to run 2 successive builds. No other changes in between, just running command from below 2 times:

"dotnet "C:\Program Files\dotnet\sdk\8.0.100\MSBuild.dll" C:[full_path].sln /t:Build /v:diag /nologo /clp:NoSummary;Verbosity=minimal /bl"

Attached is .binlog of second build:
MAUI_NET8_redacted_2.zip
.

Here are project settings for Android

PS. VisualStudio is 2022 Enterprise (17.8.3)

[jonathanpeppers]

Does the file above exist after the build is complete?

The log just looks like you nuked bin and obj between the two builds.

One thought I had was IncrementalClean was deleting files, but it doesn't appear to delete any:

(It would log 1 message for each file it deletes)