Visual studio docker build no such file or directory

在我构建新的镜像的时候， 发生 了  no such file or directory 的错误。  这个错误找了半天， 没头绪，项目结构是这样的:

WebApplication1 建立在根目录下，是可以release构建成功的，而WebApplication2是建立在根目录下的src目录下面的，release 构建执行到step8的时候就抛出no such file or directory 错误了,

dockerfile 文件如下:

FROM microsoft/dotnet:2.2-aspnetcore-runtime AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM microsoft/dotnet:2.2-sdk AS build
WORKDIR /WebApplication6/src
COPY ["src/WebApplication2/WebApplication2.csproj", "src/WebApplication2/"]
RUN dotnet restore "src/WebApplication2/WebApplication2.csproj"
COPY . .
WORKDIR "/WebApplication6/src/WebApplication2"
RUN dotnet build "WebApplication2.csproj" -c Release -o /app

FROM build AS publish
RUN dotnet publish "WebApplication2.csproj" -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "WebApplication2.dll"]

　　项目结构如下:

仔细排查得知,原来是dockerfile 的workdir设定问题，最终结果如下:

FROM microsoft/dotnet:2.2-aspnetcore-runtime AS base
WORKDIR /app
EXPOSE
EXPOSE 

FROM microsoft/dotnet:2.2-sdk AS build
WORKDIR /WebApplication6/src
COPY ["WebApplication3/WebApplication3.csproj", "WebApplication3/"]
RUN dotnet restore "WebApplication3/WebApplication3.csproj"
COPY . .
WORKDIR /WebApplication6/src/WebApplication3/
RUN dotnet build "WebApplication3.csproj" -c Release -o /app

FROM build AS publish
RUN dotnet publish "WebApplication3.csproj" -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "WebApplication3.dll"]