使用C#7.1构建DotNet Core 2.0 Exe

Question

我有一个我正在努力建立的项目.它使用的是C#7.1功能,我可以通过Visual Studio运行它但是当我尝试发布以获取.exe时我得到了错误

Agent.cs(8,30): error CS8107: Feature 'async main' is not available in C# 7.
Please use language version 7.1 or greater. [C:\Users\stuarts\Documents\Visual
Studio 2017\Projects\Agent\Agent\Agent.csproj]
CSC : error CS5001: Program does not contain a static 'Main' method suitable
for an entry point [C:\Users\stuarts\Documents\Visual Studio
2017\Projects\Agent\Agent\Agent.csproj]

csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <IsPackable>false</IsPackable>
    <NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
    <RuntimeFrameworkVersion>2.0.0-*</RuntimeFrameworkVersion>
    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
    <ApplicationIcon />
    <StartupObject />
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <LangVersion>7.1</LangVersion>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="RabbitMQ.Client" Version="5.0.1" />
  </ItemGroup>

</Project>

我正在建设

__CODE__

同样,这在VS中调试时都有效.为什么从ConsoleApplication项目模板中获取一个简单的.exe太尴尬了!

Answer 1

你的问题在于......

<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <LangVersion>7.1</LangVersion>
</PropertyGroup>

...您指定在Debug配置中使用C#7.1.

然而,随着......

dotnet publish -c Release -r win10-x64 Agent.csproj

...你在发布配置中编译.

您还需要在Release中设置C#7.1.您还可以完全删除条件,这将为任何配置设置语言版本.