为何此Dockerfile会丢失.NET Runtime引用？运行报错原因解析

核心原因是你的项目属于ASP.NET Core应用，但最终运行容器使用的基础镜像选择错误：

• 当前使用的mcr.microsoft.com/dotnet/runtime:6.0仅包含基础.NET Runtime，仅适用于控制台等非Web类型的.NET应用
• ASP.NET Core应用依赖的Microsoft.AspNetCore.App运行时框架，并没有预装在这个镜像里，这就是错误日志提示"No frameworks were found"的直接原因

错误日志里已经明确给出关键线索：

Framework: 'Microsoft.AspNetCore.App', version '6.0.0' (x64)
No frameworks were found.

修正方案 #

只需要把Dockerfile中的base阶段镜像替换为ASP.NET Core专用运行时镜像即可：

# 替换原runtime镜像为aspnet镜像
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["Project/Project.csproj", "Project/"]
COPY ["Reference/Reference.csproj", "Reference/"]
RUN dotnet restore "Project/Project.csproj"
RUN dotnet restore "Reference/Reference.csproj"
COPY . .
WORKDIR "/src/Project"
RUN dotnet build "Project.csproj" -c Release -o /app/build

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

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Project.dll"]

内容的提问来源于stack exchange，提问作者HrkBrkkl