小编Giu*_*asi的帖子

我使用 .NET 5.0 RC1 Framework 创建了一个托管在 .NET Core 应用程序中的简单 Blazor Web 程序集项目，并在 Visual Studio 2019 预览版的向导期间添加了授权。它在调试中完美运行，但如果我发布它并尝试连接到服务器，我会收到 500 错误。检查日志错误是：

Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HM37MQFV38CV", Request id "0HM37MQFV38CV:00000003": An unhandled exception was thrown by the application.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at Microsoft.Extensions.DependencyInjection.IdentityServerBuilderConfigurationExtensions.<>c.<AddSigningCredentials>b__10_2(IServiceProvider sp)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitIEnumerable(IEnumerableCallSite enumerableCallSite, RuntimeResolverContext context)
         at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitNoCache(ServiceCallSite callSite, TArgument …

我正在使用 Visual Studio 2019 使用 docker 和 .NET Core 3。我通过将 Dockerfile 添加到我的项目（右键单击项目 -> 添加 -> Docker 支持）来容器化我的应用程序，我能够启动它，但是现在我想dotnet watch run在容器内使用。

这是生成的 Dockerfile：

FROM mcr.microsoft.com/dotnet/core/aspnet:3.0-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.0-buster AS build
WORKDIR /src
COPY ["DockerTestApp/DockerTestApp.csproj", "DockerTestApp/"]
RUN dotnet restore "DockerTestApp/DockerTestApp.csproj"
COPY . .
WORKDIR "/src/DockerTestApp"
RUN dotnet build "DockerTestApp.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "DockerTestApp.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish …