Unable to build version 92 using VS2015

[merajhussain]

I am trying to build cefsharp/92 branch and I get below errors . I used vs 2015 professional to build the project

Severity Code Description Project File Line Suppression State
Error CS1617 Invalid option '7.1' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp C:\CefSharp\CefSharp\CSC 1 Active
Error CS1617 Invalid option '7.1' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp.Core C:\CefSharp\CefSharp.Core\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.BrowserSubprocess.Core\bin\x64\Release\CefSharp.BrowserSubprocess.Core.dll' could not be found CefSharp.BrowserSubprocess C:\CefSharp\CefSharp.BrowserSubprocess\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp\bin\Release\CefSharp.dll' could not be found CefSharp.BrowserSubprocess C:\CefSharp\CefSharp.BrowserSubprocess\CSC 1 Active
Error CS1617 Invalid option '7.1' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp.OffScreen C:\CefSharp\CefSharp.OffScreen\CSC 1 Active
Error CS1617 Invalid option '7.1' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp.WinForms C:\CefSharp\CefSharp.WinForms\CSC 1 Active
Error CS1617 Invalid option '7.1' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp.Wpf C:\CefSharp\CefSharp.Wpf\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.Core\bin\Release\CefSharp.Core.dll' could not be found CefSharp.OffScreen.Example C:\CefSharp\CefSharp.OffScreen.Example\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.Core.Runtime\bin\x64\Release\CefSharp.Core.Runtime.dll' could not be found CefSharp.OffScreen.Example C:\CefSharp\CefSharp.OffScreen.Example\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp\bin\Release\CefSharp.dll' could not be found CefSharp.OffScreen.Example C:\CefSharp\CefSharp.OffScreen.Example\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.Example\bin\x64\Release\CefSharp.Example.dll' could not be found CefSharp.OffScreen.Example C:\CefSharp\CefSharp.OffScreen.Example\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.OffScreen\bin\Release\CefSharp.OffScreen.dll' could not be found CefSharp.OffScreen.Example C:\CefSharp\CefSharp.OffScreen.Example\CSC 1 Active
Error CS1617 Invalid option '7.3' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6. CefSharp.Test C:\CefSharp\CefSharp.Test\CSC 1 Active
Error CS0006 Metadata file 'C:\CefSharp\CefSharp.Core\bin\Release\CefSharp.Core.dll' could not be found CefSharp.WinForms.Example C:\CefSharp\CefSharp.WinForms.Example\CSC 1 Active

Can someone help me?

[amaitland]

I used vs 2015 professional to build the project

I'd suggest using VS2019.

It's been years since I actually built CefSharp3.sln from within the VS2015 IDE, it might not actually be possible. Newer language features are used which use the Microsoft.Net.Compilers nuget package

If you absolutely need to use VS2015 then try building from powershell

.\build.ps1

AppVeyor created the official builds using VS2015, it was done via the powershell script though.

https://github.com/cefsharp/CefSharp/blob/cefsharp/92/appveyor.yml#L20

[amaitland]

If your intention is to test out some aspect of the project then I'd suggest using https://github.com/cefsharp/CefSharp.MinimalExample which should work from with VS2015 IDE.

[merajhussain]

thanks @amaitland some months ago I was able to build branch 84 with vs 2015 successfully using the IDE. Any way should I use any specific build of vs 2019 or any latest vs2019 is fine?

[amaitland]

some months ago I was able to build branch 84 with vs 2015 successfully using the IDE.

The new compiler was introduced in version `87. See 5d4897f#diff-8626d7cdacc2171b58fc8aa6090ac219fa01dd17823348705197469a4d3b1ea8

If the project compiles using build.ps1 then it might just be that the package restore needed to happen before VS2015 is opened.

latest vs2019 is fine

Latest should be fine.

[merajhussain]

able to build with VS2019