sudo pacman -S dotnet-sdk

dotnet new console -o "ProjectName"

dotnet run

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <PublishSingleFile>true</PublishSingleFile>
    <SelfContained>true</SelfContained>
    <ImplicitUsings>enable</ImplicitUsings>
    <RuntimeIdentifier>linux-x64</RuntimeIdentifier>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

dotnet publish

dotnet tool install -g dotnet-format

time dotnet format cstry.csproj 

real    0m9.388s
user    0m8.768s
sys     0m0.435s

time dotnet-format cstry.csproj 
  ワークスペース '.../try-csharp/cstry/cstry.csproj' でコード ファイルを書式設定します。
  コード ファイル '.../try-csharp/cstry/Program.cs' が書式設定されました。
  2608 ミリ秒で書式設定が完了します。

real    0m3.740s
user    0m3.598s
sys     0m0.217s

$ dotnet format
Unhandled exception: System.IO.FileNotFoundException: MSBuild のプロジェクト ファイルとソリューション ファイルの両方が '/home/r64/workspace/try-csharp/cstry/' で見つかりました。使用するファイルを <workspace> 引数で指定してください。

// Declare variables and then initialize to zero.
int num1 = 0; int num2 = 0;

// Display title as the C# console calculator app.
Console.WriteLine("Console Calculator in C#\r");
Console.WriteLine("------------------------\n");

// Ask the user to type the first number.
Console.WriteLine("Type a number, and then press Enter");
num1 = Convert.ToInt32(Console.ReadLine());

// Ask the user to type the second number.
Console.WriteLine("Type another number, and then press Enter");
num2 = Convert.ToInt32(Console.ReadLine());

// Ask the user to choose an option.
Console.WriteLine("Choose an option from the following list:");
Console.WriteLine("\ta - Add");
Console.WriteLine("\ts - Subtract");
Console.WriteLine("\tm - Multiply");
Console.WriteLine("\td - Divide");
Console.Write("Your option? ");

// Use a switch statement to do the math.
switch (Console.ReadLine())
{
  case "a":
    Console.WriteLine($"Your result: {num1} + {num2} = " + (num1 + num2));
    break;
  case "s":
    Console.WriteLine($"Your result: {num1} - {num2} = " + (num1 - num2));
    break;
  case "m":
    Console.WriteLine($"Your result: {num1} * {num2} = " + (num1 * num2));
    break;
  case "d":
    Console.WriteLine($"Your result: {num1} / {num2} = " + (num1 / num2));
    break;
}
// Wait for the user to respond before closing.
Console.Write("Press any key to close the Calculator console app...");
Console.ReadKey();

dotnet new console && dotnet add package Discord.Net

using Discord;
using Discord.WebSocket;

public class Program
{
    private static DiscordSocketClient? _client;

    public static async Task Main()
    {
        _client = new DiscordSocketClient();

        _client.Log += Log;

        var token = "token";

        await _client.LoginAsync(TokenType.Bot, token);
        await _client.StartAsync();

        // Block this task until the program is closed.
        await Task.Delay(-1);
    }

    private static Task Log(LogMessage msg)
    {
        Console.WriteLine(msg.ToString());
        return Task.CompletedTask;
    }
}

- var token = "token";
+ var jsonContent = File.ReadAllText("config.json");
+ var config = JsonConvert.DeserializeObject<ConfigClass>(jsonContent);
+ var token = config!.Token;

public class ConfigClass {
  public string? Token {get; set;}
}

public class ConfigClass {
  public required string Token {get; set;}
}