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  • .NET Core 控制台程序读 appsettings.json 、注依赖、配日志、设 IOptions

    .NET Core 控制台程序没有 ASP.NET Core 的 IWebHostBuilder 与 Startup.cs ,那要读 appsettings.json、注依赖、配日志、设 IOptions 该怎么办呢?因为这些操作与 ASP.NET Core 无依赖,所以可以自己动手,轻松搞定。

    1、读 appsettings.json ,ConfigurationBuilder 上

    var conf = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json", true, true)
        .AddJsonFile("appsettings.Development.json", true, true)
        .Build();

    需要安装 nuget 包 Microsoft.Extensions.Configuration 、Microsoft.Extensions.Configuration.FileExtensions 、Microsoft.Extensions.Configuration.Json

    2、注依赖,IServiceCollection + IServiceProvider 一起来

    IServiceCollection services = new ServiceCollection();
    //...
    services.AddSingleton<CosClient>();
    IServiceProvider serviceProvider = services.BuildServiceProvider();
    var cosClient = serviceProvider.GetService<CosClient>();

    需要安装 nuget 包 Microsoft.Extensions.DependencyInjection 

    3、配日志, AddLogging 与 ILoggingBuilder 肩并肩

    services.AddLogging(builder => builder    
        .AddConfiguration(conf.GetSection("Logging"))
        .AddConsole());

    需要安装 nuget 包 Microsoft.Extensions.Logging 、Microsoft.Extensions.Logging.Configuration 、Microsoft.Extensions.Logging.Console

    4、设IOptions,AddOptions() 与 Configure<T> 齐步走

    services.AddOptions();
    services.Configure<CosClientOptions>(conf.GetSection("cosClient"));

    需要安装 nuget 包 Microsoft.Extensions.Options 与 Microsoft.Extensions.Options.ConfigurationExtensions

    完整代码:

    class Program
    {
        static async Task Main(string[] args)
        {
            var conf = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", true, true)
                .AddJsonFile("appsettings.Development.json", true, true)
                .Build();
    
            IServiceCollection services = new ServiceCollection();
            services.AddLogging(builder => builder
                .AddConfiguration(conf.GetSection("Logging"))
                .AddConsole());
            services.AddOptions();
            services.Configure<CosClientOptions>(conf.GetSection("cosClient"));
            services.AddSingleton<CosClient>();
    
            IServiceProvider serviceProvider = services.BuildServiceProvider();
            var cosClient = serviceProvider.GetService<CosClient>();
        }
    }
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  • 原文地址:https://www.cnblogs.com/dudu/p/7803086.html
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