Open net core 3.0 nullable type error

Modify the .csproj

Join

<LangVersion>8.0</LangVersion>
<Nullable>enable</Nullable>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>

 

 Adding a separate file

 

 Compiled tips

 

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Origin www.cnblogs.com/zxcnn/p/11578096.html