我目前正试图将一个单页应用程序集成到C# .Net Core 3.1项目中，但我很难说服MSBuild编译SPA并将其捆绑到运行时可执行文件中。
SPA使用Elm + create-elm-app，因此没有使用npm。我已经调整了我的.csproj文件来委托给 elm-app build 但这并没有被调用。故意破坏Elm的代码来迫使构建失败，但没有任何效果。请注意，我已经用elm-stuff替换了node_modules，而elm-stuff是下载依赖关系等的地方。我猜测这与我的ItemGroups有关，但在我的（Rider）项目浏览器中可以识别源文件。另外请注意。
我的.csproj.cs中有趣的部分。
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
<IsPackable>false</IsPackable>
<SpaRoot>ClientApp\</SpaRoot>
<DefaultItemExcludes>$(DefaultItemExcludes);$(SpaRoot)elm-stuff\**</DefaultItemExcludes>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="EventStore.ClientAPI.NetCore" Version="4.1.0.23" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="3.1.4" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.4" />
<PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="3.1.4" />
<PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.4" />
</ItemGroup>
<ItemGroup>
<!-- Don't publish the SPA source files, but do show them in the project files list -->
<Content Remove="$(SpaRoot)**" />
<None Remove="$(SpaRoot)**" />
<None Include="$(SpaRoot)**" Exclude="$(SpaRoot)elm-stuff\**" />
</ItemGroup>
<Target Name="PublishRunWebpack" AfterTargets="ComputeFilesToPublish">
<!-- As part of publishing, ensure the JS resources are freshly built in production mode -->
<Exec WorkingDirectory="$(SpaRoot)" Command="elm-app build" />
<!-- Include the newly-built files in the publish output -->
<ItemGroup>
<DistFiles Include="$(SpaRoot)build\**" />
<ResolvedFileToPublish Include="@(DistFiles->'%(FullPath)')" Exclude="@(ResolvedFileToPublish)">
<RelativePath>%(DistFiles.Identity)</RelativePath>
<CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
</ResolvedFileToPublish>
</ItemGroup>
</Target>
</Project>
我的Startup.cs中有趣的部分：
public void ConfigureServices(IServiceCollection services)
{
....
if (_environment.IsDevelopment())
{
services.AddControllersWithViews()
.AddRazorRuntimeCompilation();
}
else
{
services.AddControllersWithViews();
}
services.AddSpaStaticFiles(configuration => { configuration.RootPath = "ClientApp/build"; });
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
....
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseSpaStaticFiles();
app.UseRouting();
app.UseSpa(spa =>
{
spa.Options.SourcePath = "ClientApp";
if (_environment.IsDevelopment())
{
spa.UseProxyToSpaDevelopmentServer("http://localhost:3000/");
}
});
}
还有dotnet构建的结果，显示C#源码编译成功，但没有提到委托或未能委托给elm-app。
will@cafell Application % dotnet build
Microsoft (R) Build Engine version 16.5.0+d4cbfca49 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.
Restore completed in 49.73 ms for /Users/will/src/startups/ideasforphotography/ideasforphotography/IdeasForPhotography.Framework/IdeasForPhotography.Framework.csproj.
Restore completed in 49.74 ms for /Users/will/src/startups/ideasforphotography/ideasforphotography/Application/Application.csproj.
Restore completed in 49.74 ms for /Users/will/src/startups/ideasforphotography/ideasforphotography/IdeasForPhotography.Domain.ClubIdeas/IdeasForPhotography.Domain.ClubIdeas.csproj.
IdeasForPhotography.Framework -> /Users/will/src/startups/ideasforphotography/ideasforphotography/IdeasForPhotography.Framework/bin/Debug/netcoreapp3.1/IdeasForPhotography.Framework.dll
IdeasForPhotography.Domain.ClubIdeas -> /Users/will/src/startups/ideasforphotography/ideasforphotography/IdeasForPhotography.Domain.ClubIdeas/bin/Debug/netcoreapp3.1/IdeasForPhotography.Domain.ClubIdeas.dll
Clubs/ClubApplicationService.cs(19,21): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). [/Users/will/src/startups/ideasforphotography/ideasforphotography/Application/Application.csproj]
Infrastructure/EventDeserializer.cs(21,30): warning CS0168: The variable 'ex' is declared but never used [/Users/will/src/startups/ideasforphotography/ideasforphotography/Application/Application.csproj]
Application -> /Users/will/src/startups/ideasforphotography/ideasforphotography/Application/bin/Debug/netcoreapp3.1/Application.dll
Application -> /Users/will/src/startups/ideasforphotography/ideasforphotography/Application/bin/Debug/netcoreapp3.1/Application.Views.dll
Build succeeded.
Clubs/ClubApplicationService.cs(19,21): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). [/Users/will/src/startups/ideasforphotography/ideasforphotography/Application/Application.csproj]
Infrastructure/EventDeserializer.cs(21,30): warning CS0168: The variable 'ex' is declared but never used [/Users/will/src/startups/ideasforphotography/ideasforphotography/Application/Application.csproj]
2 Warning(s)
0 Error(s)
Time Elapsed 00:00:03.34
所以，当我发布而不仅仅是构建应用程序时，这个配置确实有效，具体来说就是使用这个命令。
dotnet publish -c Release