如何实例化ServiceCollection并在.NET核心ConsoleApp中使用IHttpClientFactory？
如何实例化ServiceCollection并在.NET核心ConsoleApp中使用IHttpClientFactory？
提问于 2022-04-05 08:58:19
我有以下代码，在运行此代码时，当调用ConfigureService方法时，我可以验证是否在ConfigureServices方法中创建了客户机。
- 的主要问题:如何在MainAsync
- 优先级中访问clientFactory :如何通过构造函数实例化serviceColletion？
namespace CustomeNameSpace
{
public class Program
{
public static IConfigurationRoot configuration;
private static readonly IServiceCollection serviceCollection;
public static void Main(string[] args)
{
ConfigureServices();
ILogger logger = NullLogger.Instance;
MainAsync(logger).GetAwaiter().GetResult();
}
private static async Task MainAsync(ILogger log)
{
// Need to use httpClient At this location....
// var clientFactory = .....
// var client = clientFactory.CreateClient()
}
public static void ConfigureServices()
{
var serviceCollection = new ServiceCollection();
serviceCollection.AddHttpClient();
var clientFactory = serviceCollection.BuildServiceProvider().GetRequiredService<IHttpClientFactory>();
// var client = clientFactory.CreateClient();
configuration = new ConfigurationBuilder().SetBasePath(Directory.GetParent(AppContext.BaseDirectory).FullName)
.AddJsonFile("local.settings.json", false)
.Build();
}
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2022-04-05 11:35:52
需要对此代码进行重构，以采用更多流内衬的方法应用依赖项注入。
public class Program {
//async Task Main feature allowed from C# 7.1+
public static async Task Main(string[] args) {
//Composition root
IServiceProvider services = ConfigureServices();
ILogger logger = NullLogger.Instance;
IHttpClientFactory clientFactory = service.GetRequiredService<IHttpClientFactory>();
HttpClient client = clientFactory.CreateClient();
IConfiguration configuration = service.GetRequiredService<IConfiguration>();
await RunAsync(logger, client, configuration);
}
private static async Task RunAsync(ILogger log, HttpClient client, IConfiguration configuration) {
//...
}
public static IServiceProvider ConfigureServices() {
IServiceCollection services = new ServiceCollection();
services.AddHttpClient();
IConfigurationRoot configuration = new ConfigurationBuilder()
.SetBasePath(Directory.GetParent(AppContext.BaseDirectory).FullName)
.AddJsonFile("local.settings.json", false)
.Build();
services.AddSingleton<IConfigurationRoot>(configuration);
services.AddSingleton<IConfiguration>(configuration);
return services.BuildServiceProvider();
}
}请注意，任何所需的服务现在都可以根据需要从服务提供者处解析和使用。
通过将主要功能封装在类中并从服务提供者解析它，可以进一步改进这一点，以便所有显式依赖项都可以由服务容器直接解析和注入。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71748868
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