Voir la source de Application console

[[Category:CSharp]]
[[Category:VisualStudio]]
= Liens =
* [[Spectre.Console]]
* [[Command_Line_Parser_Library|Command Line Parser Library]]
* [[CSharp_7.1#Async_Main|Async Main]]

= Code =
<kode lang=csharp>
using System;

namespace MonNS
{
    class MaClasse
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("");
        }
    }
}
</kode>

= Read input =
<kode lang='cs'>
ConsoleKeyInfo keyInfo = Console.ReadKey(true);
if (keyInfo.Key == ConsoleKey.Escape) { }
</kode>

== [http://rajeshbailwal.blogspot.fr/2012/03/password-in-c-console-application.html Masquer la saisie d'un mot de passe] ==
<kode lang='csharp' collapsed>
public static string ReadPassword()
{
    string password = "";
    ConsoleKeyInfo info = Console.ReadKey(true);
    while (info.Key != ConsoleKey.Enter)
    {
        if (info.Key != ConsoleKey.Backspace)
        {
            Console.Write("*");
            password += info.KeyChar;
        }
        else if (info.Key == ConsoleKey.Backspace)
        {
            if (!string.IsNullOrEmpty(password))
            {
                // remove one character from the list of password characters
                password = password.Substring(0, password.Length - 1);

                // get the location of the cursor
                int pos = Console.CursorLeft;

                // move the cursor to the left by one character
                Console.SetCursorPosition(pos - 1, Console.CursorTop);

                // replace it with space
                Console.Write(" ");

                // move the cursor to the left by one character again
                Console.SetCursorPosition(pos - 1, Console.CursorTop);
            }
        }

        info = Console.ReadKey(true);
    }

    // add a new line because user pressed enter at the end of their password
    Console.WriteLine();

    return password;
}
</kode>

= [http://stackoverflow.com/questions/3571627/show-hide-the-console-window-of-a-c-sharp-console-application Masquer la fenêtre de la Console] =
<kode lang=csharp>
[DllImport("kernel32.dll")]
private static extern IntPtr GetConsoleWindow();

[DllImport("user32.dll")]
private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

private const int SW_HIDE = 0;
private const int SW_SHOW = 5;

var handle = GetConsoleWindow();
ShowWindow(handle, SW_HIDE);
</kode>

= Couleurs =
<kode lang='cs'>
Console.BackgroundColor = ConsoleColor.DarkRed;
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("...");
Console.ResetColor();
</kode>

= [https://andrewlock.net/using-dependency-injection-in-a-net-core-console-application/ Dependency injection] =
<kode lang='bash'>
dotnet add package Microsoft.Extensions.Hosting
</kode>

<filebox fn='Program.cs'>
var appBuilder = Host.CreateApplicationBuilder(args);
appBuilder.Services.AddSingleton<MyService>();
var host = appBuilder.Build();

var myService = host.Services.GetService<MyService>() ?? throw new NullReferenceException("MyService service");
</filebox>

== [[Asp.net_core_7#Log|Logging in .Net Core Console Apps]] ==
* [[Serilog]]
<kode lang='bash'>
dotnet add package Microsoft.Extensions.Logging.Console
</kode>

<filebox fn='Program.cs'>
var appBuilder =  Host.CreateApplicationBuilder(args);
appBuilder.Logging
    .ClearProviders()
    .AddConsole();
var host = hostBuilder.Build();

var logger = host.Services.GetService<ILoggerFactory>()?.CreateLogger<Program>() ?? throw new NullReferenceException("ILoggerFactory service");
logger.LogDebug("Starting application");
</filebox>

<filebox fn='MyService.cs'>
private readonly ILogger logger;

public MyService(ILogger logger)
{
    this.logger = logger;
}
</filebox>

== Configuration ==
<filebox fn='Program.cs'>
var appBuilder =  Host.CreateApplicationBuilder(args);
// by default the app load appsettings.json from Directory.GetCurrentDirectory()

// change to load from the directory where the binary is located
var appBuilder = new HostApplicationBuilder(
    new HostApplicationBuilderSettings { ContentRootPath = AppContext.BaseDirectory });

var host = hostBuilder.Build();
</filebox>

<filebox fn='MyService.cs'>
private readonly IConfiguration configuration;

public MyService(IConfiguration configuration)
{
    this.configuration = configuration;
}

var value = configuration.GetValue<string>("key");
var values = Configuration.GetSection("sectionKey").Get<string[]>();
</filebox>

= [[Asp.net_core_7#Configuration|Configuration]] =
<kode lang='bash'>
dotnet add package Microsoft.Extensions.Configuration.Json
dotnet add package Microsoft.Extensions.Configuration.Binder
</kode>

<filebox fn='Program.cs'>
private static IConfiguration Configuration;

static void Main(string[] args)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(AppContext.BaseDirectory)  // default value
        .AddJsonFile("appsettings.json");

    Configuration = builder.Build();

    var value1 = Configuration.GetValue<string>("section1");
    var value2 = Configuration.GetValue<int>("section2");
    var values = Configuration.GetSection("section3").Get<string[]>();
</filebox>

<filebox fn='MyProject.csproj' lang='xml'>
<!-- copy the appsettings.json file in the output folder -->
<ItemGroup>
  <None Include="appsettings.json" CopyToOutputDirectory="PreserveNewest" />
</ItemGroup>
</filebox>

= Entity Framework Core =
<filebox fn='Program.cs'>
// nuget package: Microsoft.Extensions.Hosting

HostApplicationBuilder builder = Host.CreateApplicationBuilder(args);  // allow to use scaffold with a named connection string

var connectionString = builder.Configuration.GetConnectionString("DB1");
var serverVersion = new MariaDbServerVersion(new Version(11, 0, 2));

builder.Services.AddDbContext<DB1Context>(
    dbContextOptions => dbContextOptions
        .UseMySql(connectionString, serverVersion)
        // TODO The following three options help with debugging, but should be changed or removed for production.
        .LogTo(Console.WriteLine, LogLevel.Information)
        .EnableSensitiveDataLogging()
        .EnableDetailedErrors());

builder.Services.AddTransient<ItemRepository>();

using IHost host = builder.Build();

var itemRepository = host.Services.GetService<ItemRepository>();
if (itemRepository is not null)
{
    await itemRepository.GetAllItemsAsync();
}

//await host.RunAsync();
</filebox>