Jetbrains Rider with Mono and C# 7.0 Features

Asked Mar 26 '19 at 12:52

Active Mar 26 '19 at 16:09

Viewed 694 times

I started using Mono 5.2 with Jetbrains Rider and i got the following error in some peaces of my code:

So, looking at my Compiler settings i just have MSBUILD 14.0, i if i'm not wrong i need MSBUILD 15.0 to C# 7.0 works, right ?

How can i fix it ?

Edit 1 I setted the language to C# 7.0 but i can't use C# 7.0 features, see:

This don't work:

   return (int?)idCompanhia;

I got the following error:

But this works fine:

return (int)idCompanhia;

Edit 2 This is my method using this int?

 public static int? ObterIdCompanhia(string companhia)
        {
            int.TryParse(companhia, out var idCompanhia);
            return idCompanhia == 0 ? null : (int?)idCompanhia;
        }

edited Mar 26 '19 at 16:09

asked Mar 26 '19 at 12:52

Ronaldo Lanhellas

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Have you [checked this](https://www.jetbrains.com/help/rider/ReSharper_by_Language__CSharp.html)? Do you have the C#7 compiler instaled? – Magnetron Mar 26 '19 at 13:25
I edited my post with some informations, i already setted the C#7 compiler. – Ronaldo Lanhellas Mar 26 '19 at 13:34
The error in `return (int?)idCompanhia;` seems to be a runtime error, which means that the code compiled successfully. I cannot say what the cause is, without seeing the relevant declarations and the context. Please post code as text, not as image, if possible. – Olivier Jacot-Descombes Mar 26 '19 at 15:05
I edited the post with method that uses this "int?" – Ronaldo Lanhellas Mar 26 '19 at 16:10
Have you tried ‘out int idCompanhia’? And then don’t cast it as an integer here ‘: (int?) idCompanhia’ – Lloyd Nicholson Dec 10 '19 at 21:56

Jetbrains Rider with Mono and C# 7.0 Features

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