ASP.NET .NET Core 控制台应用程序的核心配置

Question

ASP.NETCore支持一个新的配置系统，如下所示：https://docs.asp.net/en/latest/fundamentals/configuration.html

也支持这种模式吗？NET核心控制台应用程序？

如果不是，什么是替代以前的app.config和ConfigurationManager模型？

Answer 1

如果使用＜code＞Microsoft.Extensions。托管（版本2.1.0）以托管您的控制台应用程序和asp。net核心应用程序，您的所有配置都注入了HostBuilder的ConfigureAppConfiguration和 方法。下面是关于如何添加＜code＞appsettings的演示。json和环境变量：

    var hostBuilder = new HostBuilder()
        .ConfigureHostConfiguration(config =>
        {
            config.AddEnvironmentVariables();

            if (args != null)
            {
                // enviroment from command line
                // e.g.: dotnet run --environment "Staging"
                config.AddCommandLine(args);
            }
        })
        .ConfigureAppConfiguration((context, builder) =>
        {
            var env = context.HostingEnvironment;
            builder.SetBasePath(AppContext.BaseDirectory)
            .AddJsonFile("appsettings.json", optional: false)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
            // Override config by env, using like Logging:Level or Logging__Level
            .AddEnvironmentVariables();

        })
        ... // add others, logging, services
        //;

为了编译上面的代码，你需要添加这些包：

<PackageReference Include="Microsoft.Extensions.Configuration" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.CommandLine" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Hosting" Version="2.1.0" />

Answer 2

您可以使用以下代码片段。它包括配置和DI。

public class Program
{
    public static ILoggerFactory LoggerFactory;
    public static IConfigurationRoot Configuration;

    public static void Main(string[] args)
    {
        Console.OutputEncoding = Encoding.UTF8;

        string environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

        if (String.IsNullOrWhiteSpace(environment))
            throw new ArgumentNullException("Environment not found in ASPNETCORE_ENVIRONMENT");

        Console.WriteLine("Environment: {0}", environment);

        var services = new ServiceCollection();

        // Set up configuration sources.
        var builder = new ConfigurationBuilder()
            .SetBasePath(Path.Combine(AppContext.BaseDirectory))
            .AddJsonFile("appsettings.json", optional: true);
        if (environment == "Development")
        {

            builder
                .AddJsonFile(
                    Path.Combine(AppContext.BaseDirectory, string.Format("..{0}..{0}..{0}", Path.DirectorySeparatorChar), $"appsettings.{environment}.json"),
                    optional: true
                );
        }
        else
        {
            builder
                .AddJsonFile($"appsettings.{environment}.json", optional: false);
        }

        Configuration = builder.Build();

        LoggerFactory = new LoggerFactory()
            .AddConsole(Configuration.GetSection("Logging"))
            .AddDebug();

        services
            .AddEntityFrameworkNpgsql()
            .AddDbContext<FmDataContext>(o => o.UseNpgsql(connectionString), ServiceLifetime.Transient);

        services.AddTransient<IPackageFileService, PackageFileServiceImpl>();

        var serviceProvider = services.BuildServiceProvider();

        var packageFileService = serviceProvider.GetRequiredService<IPackageFileService>();

        ............
    }
}

哦，别忘了加上project.json

{
  "version": "1.0.0-*",
  "buildOptions": {
    "emitEntryPoint": true,
    "copyToOutput": {
      "includeFiles": [
        "appsettings.json",
        "appsettings.Integration.json",
        "appsettings.Production.json",
        "appsettings.Staging.json"
      ]
    }
  },

  "publishOptions": {
    "copyToOutput": [
      "appsettings.json",
      "appsettings.Integration.json",
      "appsettings.Production.json",
      "appsettings.Staging.json"
    ]
  },
...
}

Answer 3

对于 .NET Core 2.0 控制台应用，我执行以下操作：

1. 在项目的根目录中创建一个名为 appsettings.json 的新文件（文件名可以是任何内容）
2. 将我的特定设置作为 json 添加到该文件中。例如：

{
  "myKey1" :  "my test value 1", 
  "myKey2" :  "my test value 2", 
  "foo" :  "bar" 
}

配置为在生成项目时将文件复制到输出目录（在VS中-

在我的项目中安装以下nuget包：

< li >微软。extensions . configuration . JSON

将以下内容添加到Program.cs（或Main（）所在的位置）：

static void Main(string[] args)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json");

    var configuration = builder.Build();

    // rest of code...
}

然后使用以下方法之一读取这些值:

string myKey1 = configuration["myKey1"];
Console.WriteLine(myKey1);

string foo = configuration.GetSection("foo").Value;
Console.WriteLine(foo);

更多信息： https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration?tabs=basicconfiguration#simple-configuration