C# Azure函数中具有依赖项注入的HttpClient

表示使用builder.Services.AddHttpClient进行注册 HttpClient，但是我可以在没有这个的情况下解析HttpClient

我有一家小公司，只注册MyService：

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        builder.Services.AddTransient<MyService>();
    }
}

在函数中，我想解析HttpClient和MyService，这段代码可以正常工作

public class Function
{
    public Function(MyService service, HttpClient client)
    {
    }

    [FunctionName("func")]
    public async Task<IActionResult> Update(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)]
        HttpRequest request,
        ILogger logger)
    {
        return new OkObjectResult("Hello");
    }
}

谁在哪里注册HttpClient？ 我应该使用builder.Services.AddHttpClient吗？这不是多余的吗？

---

你说得对。您首先需要向it注册服务：

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        //Register HttpClientFactory
        builder.Services.AddHttpClient();

        builder.Services.AddTransient<MyService>();
    }
}

如果您的服务将使用HttpClientFactory，则在服务之前进行注册非常重要。因此，当MyService实例依赖关系得到解决时，DI容器中已经有一条HttpCliendFactory的记录

然后，Function.cs类将是：

public class Function
{
    private IHttpClientFactory _httpClientFactory;
    private MyService _myService;


    public Function(MyService myService, IHttpClientFactory client)
    {
        _myService = myService;
        _httpClientFactory = httpClientFactory;
    }

    [FunctionName("func")]
    public async Task<IActionResult> Update(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)]
        HttpRequest request,
        ILogger logger)
    {
        //How to use example
        var client = _httpClientFactory.CreateClient();

        return new OkObjectResult("Hello");
    }
}

---

HttpClient当然可以在没有客户端工厂的情况下使用，但是如果您从HttpClientFactory生成HttpClient对象，您将能够更好地对HttpClient资源进行开箱即用的管理

你说得对。您首先需要向it注册服务：

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        //Register HttpClientFactory
        builder.Services.AddHttpClient();

        builder.Services.AddTransient<MyService>();
    }
}

如果您的服务将使用HttpClientFactory，则在服务之前进行注册非常重要。因此，当MyService实例依赖关系得到解决时，DI容器中已经有一条HttpCliendFactory的记录

然后，Function.cs类将是：

public class Function
{
    private IHttpClientFactory _httpClientFactory;
    private MyService _myService;


    public Function(MyService myService, IHttpClientFactory client)
    {
        _myService = myService;
        _httpClientFactory = httpClientFactory;
    }

    [FunctionName("func")]
    public async Task<IActionResult> Update(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)]
        HttpRequest request,
        ILogger logger)
    {
        //How to use example
        var client = _httpClientFactory.CreateClient();

        return new OkObjectResult("Hello");
    }
}

---

HttpClient当然可以在没有客户端工厂的情况下使用，但是如果您从HttpClientFactory生成HttpClient对象，您将能够更好地对HttpClient资源进行开箱即用的管理

对你有用吗？你需要进一步的帮助吗？对你有用吗？你需要进一步的帮助吗？