title: Unable to build docker image from docker file, for dotnet core web application
body: <p>I am trying to build a docker image for dotnet core app on windows which I am planning to host it on Kubernetes </p>
  
  <p>with following details</p>
  
  <pre><code>#docker file
  
  FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
  WORKDIR /app
  EXPOSE 8989
  
  FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
  WORKDIR /src
  COPY ["amazing-app.csproj", "amazing-app/"]
  RUN dotnet restore "amazing-app/amazing-app.csproj"
  COPY . .
  WORKDIR "/src/amazing-app"
  RUN dotnet build "amazing-app.csproj" -c Release -o /app/build
  
  FROM build AS publish
  RUN dotnet publish "amazing-app.csproj" -c Release -o /app/publish
  
  FROM base AS final
  WORKDIR /app
  COPY --from=publish /app/publish .
  ENTRYPOINT ["dotnet", "amazing-app.dll"]
  </code></pre>
  
  <p>directory Structure is >></p>
  
  <p><a href="https://i.stack.imgur.com/eB3af.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eB3af.png" alt="enter image description here"></a></p>
  
  <p>After running <code>docker build -t amazing-app-one .</code> I am getting following error at step 10/16. Application builds &amp; runs locally but docker is not able to build image out of it.</p>
  
  <pre><code>$&gt; &lt;Path&gt;\amazing-app&gt;docker build -t amazing-app-one .
  Sending build context to Docker daemon  5.741MB
  Step 1/16 : FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
   ---&gt; 08096137b740
  Step 2/16 : WORKDIR /app
   ---&gt; Running in 14f5f9b7b3e5
  Removing intermediate container 14f5f9b7b3e5
   ---&gt; ae4846eda3f7
  Step 3/16 : EXPOSE 8989
   ---&gt; Running in 0f464e383641
  Removing intermediate container 0f464e383641
   ---&gt; 6b855b84749e
  Step 4/16 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
   ---&gt; 9817c25953a8
  Step 5/16 : WORKDIR /src
   ---&gt; Running in 5a8fc99a3ecf
  Removing intermediate container 5a8fc99a3ecf
   ---&gt; 694d5063e8e6
  Step 6/16 : COPY ["amazing-app.csproj", "amazing-app/"]
   ---&gt; 450921f630c3
  Step 7/16 : RUN dotnet restore "amazing-app/amazing-app.csproj"
   ---&gt; Running in ddb564e875be
    Restore completed in 1.81 sec for /src/amazing-app/amazing-app.csproj.
  Removing intermediate container ddb564e875be
   ---&gt; b59e0c1dfb4d
  Step 8/16 : COPY . .
   ---&gt; 695977f3b543
  Step 9/16 : WORKDIR "/src/amazing-app"
   ---&gt; Running in aa5575c99ce3
  Removing intermediate container aa5575c99ce3
   ---&gt; 781b4c552434
  Step 10/16 : RUN dotnet build "amazing-app.csproj" -c Release -o /app/build
   ---&gt; Running in 3a602c34b5a9
  Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core
  Copyright (C) Microsoft Corporation. All rights reserved.
  
    Restore completed in 36.78 ms for /src/amazing-app/amazing-app.csproj.
  CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point [/src/amazing-app/amazing-app.csproj]
  
  Build FAILED.
  
  CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point [/src/amazing-app/amazing-app.csproj]
      0 Warning(s)
      1 Error(s)
  
  Time Elapsed 00:00:02.37
  The command '/bin/sh -c dotnet build "amazing-app.csproj" -c Release -o /app/build' returned a non-zero code: 1
  </code></pre>
  
  <p>find the source code on <a href="https://github.com/Kundan22/amazing-app/tree/master/amazing-app" rel="nofollow noreferrer">github link</a></p>
  
  <p>am I missing something here? any help much appreciated.</p>