Application console
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Code
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using System;
namespace MonNS
{
class MaClasse
{
public static void Main(string[] args)
{
Console.WriteLine("");
}
}
}
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Read input
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ConsoleKeyInfo keyInfo = Console.ReadKey(true);
if (keyInfo.Key == ConsoleKey.Escape) { }
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Masquer la saisie d'un mot de passe
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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;
}
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Masquer la fenêtre de la Console
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[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);
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Couleurs
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Console.BackgroundColor = ConsoleColor.DarkRed;
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("...");
Console.ResetColor();
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Dependency injection
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dotnet add package Microsoft.Extensions.Hosting |
| 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");
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Logging in .Net Core Console Apps
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dotnet add package Microsoft.Extensions.Logging.Console |
| 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");
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| MyService.cs |
private readonly ILogger logger;
public MyService(ILogger logger)
{
this.logger = logger;
}
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Configuration
| 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();
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| 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[]>();
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Configuration
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dotnet add package Microsoft.Extensions.Configuration.Json dotnet add package Microsoft.Extensions.Configuration.Binder |
| 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[]>();
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| MyProject.csproj |
<!-- copy the appsettings.json file in the output folder --> <ItemGroup> <None Include="appsettings.json" CopyToOutputDirectory="PreserveNewest" /> </ItemGroup> |
Entity Framework Core
| 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();
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