Info

this directory contains a replica of ASP.NET Core Docker Sample at commit 0fc0e2c6af6303cfd4676f1ac8c21090d82b0072 Update samples to .NET 6 with aspnetapp project from ASP.NET Core Docker Container Sample for DigitalOcean App Platform added Elastic.Apm.NetCoreAll to dependenies, and to Startup.cs

• packaged

• sources - many interdependent projects see e.g. Elastic.Apm.NetCoreAll.csproj

• releases

Usage

• pull base images

docker pull mcr.microsoft.com/dotnet/runtime:6.0-alpine3.16-amd64

docker image ls | grep mcr.microsoft.com/dotnet/runtime

mcr.microsoft.com/dotnet/runtime          6.0-alpine3.16-amd64    532cc32c09d3   13 days ago     79.7MB

docker pull mcr.microsoft.com/dotnet/sdk:6.0-alpine3.16-amd64

docker image ls | grep mcr.microsoft.com/dotnet/sdk

mcr.microsoft.com/dotnet/sdk              6.0-alpine3.16-amd64    c5e11f288acd   13 days ago     604MB

docker pull mcr.microsoft.com/dotnet/aspnet:6.0-alpine-amd64

• build

IMAGE=basic-aspnetapp
docker build -t $IMAGE -f Dockerfile .

• test without APM

NAME=basic-aspnetapp
docker run --name $NAME -it -p 8000:80 $IMAGE

• test with APM

NAME=basic-aspnetapp
ELK_NETWORK=basic-elk-cluster_elastic 
docker run --name $NAME --network $ELK_NETWORK -it -p 8000:80 $IMAGE

or

docker start $NAME

curl -s http://localhost:8000 | grep Welcome

<h1 class="display-4">Welcome to ASP.NET Core on DigitalOcean App Platform</h1>

C# Code Styles

• vanilla ASP .Net Core code aparently is a regular one - usage of statement Lambda operator indicates it's a 6.x C# not a 5.x compatible C#
  • Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace aspnetapp {
  public class Program {
    public static void Main(string[] args) {
      CreateHostBuilder(args).Build().Run(); }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
      Host.CreateDefaultBuilder(args).ConfigureWebHostDefaults(
        webBuilder => { webBuilder.UseStartup<Startup>(); });
   }	
}

• Some Microsoft example C# looks a bit excesively modern and resembles a VB.Net:
  • Program.cs

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();

var app = builder.Build();

if (!app.Environment.IsDevelopment()) {
    app.UseExceptionHandler("/Error");
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();

The latter syntax change appears unnnecessary for such a basic app. Besides the code snippets and documentation on Elastic are written in C# 6.0

Cleanup

NAME=basic-aspnetapp
docker container stop $NAME
docker container rm $NAME
IMAGE=basic-aspnetapp
docker image rm $IMAGE

See Also

* https://hub.docker.com/_/microsoft-dotnet-runtime/
* https://hub.docker.com/_/microsoft-dotnet-sdk/
* [C# language versioning](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version)
* what's new in [C# 9](https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9)
* what's new in [C# 10](https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10)
* what's new in [C# 11](https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-11)
* the four ways of [what ASP.NET Web Forms Really is beneath Server Controls](https://www.codeproject.com/articles/what-aspnet-web-forms-really-is-benea1768274267459)

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Author

Serguei Kouzmine