ASP.net核心API 2.1应用|构建Docker映像时，Dotnet恢复在Dockerfile中失败Windows容器|

问题描述

请帮助我解决此问题，它已成为我的主要障碍。

工具： 1.Microsoft Visual Studio Enterprise 2019版本16.7.1
2. Docker桌面（Docker版本19.03.12，内部版本48a66213fe）

问题： 通过Dockerfile构建映像时，运行dotnet restore命令失败。 如果我在命令提示符下运行相同的“ dotnet restore命令”，则说明该命令执行成功。
我到目前为止所做的事情：

1. 我重新安装了VS 2019和docker桌面，但无济于事。

2. 我试图从其他论坛获得答案，但没有帮助。

    **DockerFile**:
    FROM mcr.microsoft.com/dotnet/core/aspnet:2.1 AS base
    EXPOSE 80
   
    FROM mcr.microsoft.com/dotnet/core/sdk:2.1 AS build
    WORKDIR /src
    COPY ["PatientService/PatientService.csproj","PatientService/"]
    RUN dotnet restore "PatientService/PatientService.csproj"
    COPY . .
    WORKDIR "/src/PatientService"
    RUN dotnet build "PatientService.csproj" -c Release -o /app/build
   
    FROM build AS publish
    RUN dotnet publish "PatientService.csproj" -c Release -o /app/publish
   
    FROM base AS final
    WORKDIR /app
    COPY --from=publish /app/publish .
    ENTRYPOINT ["dotnet","PatientService.dll"]
   
    **Output**:
    1>------ Rebuild All started: Project: PatientService,Configuration: Debug Any CPU ------
    1>PatientService -> D:\Projects_Exercise\PatientService\PatientService\bin\Debug\netcoreapp2.1\PatientService.dll
    1>Docker version 19.03.12,build 48a66213fe
    1>docker build -f "d:\projects_exercise\patientservice\patientservice\dockerfile" --force-rm -t patientservice  --label "com.microsoft.created-by=visual-studio" --label "com.microsoft.visual-studio.project-name=PatientService" "d:\projects_exercise\patientservice"
    1>Sending build context to Docker daemon  70.66kB
    1>
    1>Step 1/17 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.1 AS base
    1> ---> cd464c4949df
    1>Step 2/17 : EXPOSE 80
    1> ---> Using cache
    1> ---> 113b7b4da631
    1>Step 3/17 : FROM mcr.microsoft.com/dotnet/core/sdk:2.1 AS build
    1> ---> 58b9fa67619f
    1>Step 4/17 : WORKDIR /src
    1> ---> Using cache
    1> ---> 63c1068fe906
    1>Step 5/17 : COPY ["PatientService/PatientService.csproj","PatientService/"]
    1> ---> Using cache
    1> ---> e9dd2773b565
    1>Step 6/17 : RUN dotnet restore "PatientService/PatientService.csproj"
    1> ---> Running in 64786399b7ae
    1>C:\Program Files\dotnet\sdk\2.1.809\NuGet.targets(123,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [C:\src\PatientService\PatientService.csproj]
    1>C:\Program Files\dotnet\sdk\2.1.809\NuGet.targets(123,5): error :   No such host is known [C:\src\PatientService\PatientService.csproj]
    1>Removing intermediate container 64786399b7ae
    1>The command 'cmd /S /C dotnet restore "PatientService/PatientService.csproj"' returned a non-zero code: 1
    1>d:\projects_exercise\patientservice\patientservice\dockerfile : error CTC1014: Docker command failed with exit code 1.
    1>d:\projects_exercise\patientservice\patientservice\dockerfile : error CTC1014: The command 'cmd /S /C dotnet restore "PatientService/PatientService.csproj"' returned a non-zero code: 1
    1>Done building project "PatientService.csproj" -- FAILED.
    ========== Rebuild All: 0 succeeded,1 failed,0 skipped ==========
   

解决方法

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