How to specify the equivalent of /features:strict (of csc.exe) to msbuild.exe or in the .csproj file?

Question

Introduction

Consider this simple (and bad) C# class:

using System;

namespace N
{
  static class C
  {
    static void M(DateTime d)
    {
      if          


        

Answer 1

This flag is supported in csproj file directly, just add:

<Features>strict</Features>

To the appropriate PropertyGroup in your csproj file, and after build you will see this warning for your code:

Warning CS8073 The result of the expression is always 'false' since a value of type 'DateTime' is never equal to 'null' of type 'DateTime?'

If you want to do the same via msbuild command-line interface, just set this property with /p:Features=strict, like this:

/t:rebuild /p:Configuration=Debug /p:Platform=x64 /p:Features=strict