msbuild runs against 'get => ...' property accessor

Question

Hi, Gent's.

This code

    public class SampleCS1043
    {
        public int Something
        {
            get => 666;
            set { }
        }
        public int Anything { set; get; }

        public void Method()
        {
            Something = 3;
            Anything = 42;
            Console.WriteLine("Some is {0}, Any is {1}", Something, Anything);
        }
    }

compiles and runs fine within VS Enterprise 2017.

But when doing a build by command shell, I get

  SampleCS1043.cs(13,17): error CS1043: { or ; expected 
  SampleCS1043.cs(13,17): error CS1513: } expected 
  SampleCS1043.cs(14,17): error CS1002: ; expected 
  SampleCS1043.cs(15,10): error CS1513: } expected 

with line 13 being SampleCS1043.Something.get().

My build command is

"C:/Program Files (x86)/Microsoft Visual Studio/2017/Enterprise/MSBuild/15.0/Bin"/msbuild.exe Some.csproj /p:Configuration=Debug /p:VisualStudioVersion=14.0 /p:TargetFrameworkVersion=v4.5 /tv:14.0  /l:FileLogger,Microsoft.Build.Engine

So, my question is: What am I doing wrong? Tools version? Studio version? Framework version? MSBuild version?

THX in advance

Mike

Answer 1

hi , 

use the targetframeworkversion version 4.7 

c# expression bodied get and set for properties is allowed in c#7.0

https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7

kind regards

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Answer 2

Sorry, no:

C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets(1098,5): error MSB3644: The reference assemblies for framework ".NETFramework,Version=v4.7" were not found.

Answer 3

have you already updated your visual studio 2017 with 15.1 or higher? 

because i remember that this was a bug a while ago. 

https://developercommunity.visualstudio.com/content/problem/44043/net-framework-47-not-available-on-the-hosted-vs201.html

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Answer 4

Hi mike.soft,

Thank you for posting here.

I test the code you provided. When I build it, it works well. For VS 2017, you should use 15.0.

"C:/Program Files (x86)/Microsoft Visual Studio/2017/Enterprise/MSBuild/15.0/Bin"/msbuild.exe Some.csproj /p:Configuration=Debug /p:VisualStudioVersion=15.0 /p:TargetFrameworkVersion=v4.5 /tv:15.0

Here is the code I test in msBuild.exe.

    class Program
    {
        static void Main(string[] args)
        {          
            int s= SampleCS1043.Something;
            SampleCS1043.Method();
            Console.ReadKey();
        }     
    }
    public class SampleCS1043
    {
        public static int Something
        {
            get => 666;
            set { }
        }
        public static int Anything { set; get; }

        public static void Method()
        {
            Something = 3;
            Anything = 42;
            Console.WriteLine("Some is {0}, Any is {1}", Something, Anything);
        }
    }

What is the logger doing for? If I do not use it. It will show the Build succeeded.

If I use the command below, it will show the build error.

/l:FileLogger,Microsoft.Build.Engine

MSBUILD : Logger error MSB4104: Failed to write to log file "msbuild.log". Access to the path 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\msbuild.log' is denied.

If the logger is helpful to you, I will do the further testing.

Best Regards,

Wendy

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Answer 5

The 'About' screen says Version 15.3.0.

Thanks, thow.

Answer 6

That's it, Wendy.

Thanks a lot!