Rider suggests to use C# 8 syntax but then fails to build solution

Question

Rider suggests to use C# 8 syntax, such as using declaration or async streams.

However, when I apply the recommended refactor, build fails on syntax errors.

My csproj.DotSettings file contains the language level set to latest:

<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <s:String x:Key="/Default/CodeInspection/CSharpLanguageProject/LanguageLevel/@EntryValue">latest</s:String>
...
</wpf:ResourceDictionary>

To clarify - I'm all for using C# 8. Where can I set the compiler target language? Or could it be just not supported yet?

In my project properties:

smolchanovsky · Accepted Answer · 2019-09-08 07:34:14Z

2

To use C# 8, you need to install MSBuild 16 and then write the exact version of the language in the project settings (csproj).

</PropertyGroup>
  ...
  <LangVersion>8</LangVersion>
</PropertyGroup>

answered Sep 8, 2019 at 7:34

smolchanovsky

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