只有 1 个 Main 方法的 XUnit 测试项目:“程序定义了多个入口点". [英] XUnit test project with only 1 Main method: "Program has more than one entry point defined."

问题描述

我在 Visual Studio 2017 RC 中将 vNext 格式的 .NET xUnit 测试项目(带有 project.json)转换为新的 .csproj 格式，并开始出现以下错误.大多数针对此错误的在线答案都说您有两个 Main 方法；去掉一个."这似乎是一个显而易见的解决方案，但该项目只有一个 Main 方法.

I converted a vNext format .NET xUnit test project (with project.json) to the new .csproj format in Visual Studio 2017 RC and started getting the below error. Most of the online answers to this error say "You have two Main methods; get rid of one." This seems like an obvious solution, but this project has only one Main method.

错误:

CS0017 程序定义了多个入口点.使用/main 编译以指定包含入口点的类型.项目名称 C:path oProgram.cs

CS0017 Program has more than one entry point defined. Compile with /main to specify the type that contains the entry point. Project.Name C:path oProgram.cs

Program.cs:

using XunitProgram = Xunit.Runner.DotNet.Program;

namespace My.Namespace.Tests
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            XunitProgram.Main(args);
        }
    }
}

旧的 project.json:

{
  "version": "1.0.0-*",
  "testRunner": "xunit",
    "buildOptions": {
        "emitEntryPoint": true,
        "preserveCompilationContext": true,
        "debugType": "full"
    },

    "dependencies": {
        "dotnet-test-xunit": "2.2.0",
        "xunit": "2.2.0",
        "Microsoft.DotNet.InternalAbstractions": "1.0.0"
    },
  "frameworks": {
    "net462": {}
  }
}

新建 Project.csproj:

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

    <PropertyGroup>
        <TargetFramework>net462</TargetFramework>
        <RuntimeIdentifier>win7-x86</RuntimeIdentifier>
        <DebugType>full</DebugType>
        <PreserveCompilationContext>true</PreserveCompilationContext>
        <AssemblyName>My.Project.Tests</AssemblyName>
        <OutputType>Exe</OutputType>
        <PackageId>My.Project.Tests</PackageId>
        <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
        <GenerateAssemblyConfigurationAttribute>false</GenerateAssemblyConfigurationAttribute>
        <GenerateAssemblyCompanyAttribute>false</GenerateAssemblyCompanyAttribute>
        <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
        <RootNamespace>My.Project.Tests</RootNamespace>
        <StartupObject />
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0-preview-20170106-08" />
        <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
        <PackageReference Include="xunit" Version="2.2.0" />
    </ItemGroup>

    <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
        <Reference Include="System" />
        <Reference Include="Microsoft.CSharp" />
    </ItemGroup>

    <ItemGroup>
        <Folder Include="SampleInput" />
    </ItemGroup>

</Project>

推荐答案

这需要一些修补才能弄清楚.在 VS 2017 中迁移到新的项目格式后，微软悄悄地为 Microsoft.NET.Test.Sdk 添加了一个依赖项，我相信它有自己的 Main 方法.

This took a bit of tinkering to figure out. Upon migration to the new project format in VS 2017, Microsoft quietly added a dependency for Microsoft.NET.Test.Sdk, which I believe has its own Main method.

如果您在 VS 2017 RC 中创建一个新的 xUnit 测试项目以及您已迁移的项目，您会注意到它不再使用调用 XUnit 运行程序的 Main 方法创建 Program.cs.

If you create a new xUnit Test Project in VS 2017 RC alongside the one that you had migrated, you will notice that it no longer creates a Program.cs with a Main method invoking the XUnit runner.

要解决此问题，请删除您唯一可见的 Main 方法.您的测试仍将照常执行，前提是您具有上述包引用 (Microsoft.NET.Test.Sdk、xunit.runner.visualstudio、xunit).

To fix this, delete your sole visible Main method. Your tests will still execute as normal, provided you have the above package references (Microsoft.NET.Test.Sdk, xunit.runner.visualstudio, xunit).

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