IHttpClientFactory 的解析服务在 Azure 函数上失败
Resolving service for IHttpClientFactory fails on Azure Function
我正在尝试在 Azure Function v3 上注入 IHttpClientFactory
服务,但我不断收到以下错误消息,提示服务解析失败。
我在本地使用 azure-functions-core-tools@v3 运行 Azure Function。
[2/14/2020 5:45:19 PM] Executed 'Foo' (Failed, Id=24489b3b-af99-417e-b175-443b76c241d5)
[2/14/2020 5:45:19 PM] Microsoft.Extensions.DependencyInjection.Abstractions: Unable to resolve service for type 'System.Net.Http.IHttpClientFactory' while attempting to activate 'MyFunction.Function.Foo'.
我有一家初创公司 class,它应该为 IHttpClientFactory
注入服务。
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
namespace MyFunction
{
public class Startup : FunctionsStartup
{
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services.AddHttpClient();
}
}
}
下面是一个 azure 函数 class,它使用 IHttpClientFactory
的注入服务来创建 HTTP 客户端并向服务器发送 GET 请求。
using System.Threading.Tasks;
using System.Net.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
namespace MyFunction.Function
{
public class Foo
{
private readonly HttpClient httpClient;
public Scrape(IHttpClientFactory httpClientFactory)
{
httpClient = httpClientFactory.CreateClient();
}
[FunctionName("Foo")]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
var result = await httpClient.GetAsync("https://google.com");
var data = await result.Content.ReadAsStringAsync();
return new OkObjectResult(data);
}
}
}
我是不是漏掉了什么?
您的 startup.cs
class 似乎缺少程序集参考?
[assembly: FunctionsStartup(typeof(MyFunction.Startup))]
尝试将其添加到启动程序中 class。在顶部的 using
语句之后和任何名称空间声明之前添加它。
此外,我见过的大多数示例都显示了在函数执行期间实际创建的客户端,而不是在默认构造函数中创建的。
using System.Threading.Tasks;
using System.Net.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
namespace MyFunction.Function
{
public class Foo
{
private readonly HttpClient httpClient;
public Scrape(IHttpClientFactory httpClientFactory)
{
factory = httpClientFactory;
}
[FunctionName("Foo")]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
HttpClient httpClient = factory.CreateClient();
var result = await httpClient.GetAsync("https://google.com");
var data = await result.Content.ReadAsStringAsync();
return new OkObjectResult(data);
}
}
}
我正在尝试在 Azure Function v3 上注入 IHttpClientFactory
服务,但我不断收到以下错误消息,提示服务解析失败。
我在本地使用 azure-functions-core-tools@v3 运行 Azure Function。
[2/14/2020 5:45:19 PM] Executed 'Foo' (Failed, Id=24489b3b-af99-417e-b175-443b76c241d5)
[2/14/2020 5:45:19 PM] Microsoft.Extensions.DependencyInjection.Abstractions: Unable to resolve service for type 'System.Net.Http.IHttpClientFactory' while attempting to activate 'MyFunction.Function.Foo'.
我有一家初创公司 class,它应该为 IHttpClientFactory
注入服务。
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
namespace MyFunction
{
public class Startup : FunctionsStartup
{
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services.AddHttpClient();
}
}
}
下面是一个 azure 函数 class,它使用 IHttpClientFactory
的注入服务来创建 HTTP 客户端并向服务器发送 GET 请求。
using System.Threading.Tasks;
using System.Net.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
namespace MyFunction.Function
{
public class Foo
{
private readonly HttpClient httpClient;
public Scrape(IHttpClientFactory httpClientFactory)
{
httpClient = httpClientFactory.CreateClient();
}
[FunctionName("Foo")]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
var result = await httpClient.GetAsync("https://google.com");
var data = await result.Content.ReadAsStringAsync();
return new OkObjectResult(data);
}
}
}
我是不是漏掉了什么?
您的 startup.cs
class 似乎缺少程序集参考?
[assembly: FunctionsStartup(typeof(MyFunction.Startup))]
尝试将其添加到启动程序中 class。在顶部的 using
语句之后和任何名称空间声明之前添加它。
此外,我见过的大多数示例都显示了在函数执行期间实际创建的客户端,而不是在默认构造函数中创建的。
using System.Threading.Tasks;
using System.Net.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
namespace MyFunction.Function
{
public class Foo
{
private readonly HttpClient httpClient;
public Scrape(IHttpClientFactory httpClientFactory)
{
factory = httpClientFactory;
}
[FunctionName("Foo")]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
HttpClient httpClient = factory.CreateClient();
var result = await httpClient.GetAsync("https://google.com");
var data = await result.Content.ReadAsStringAsync();
return new OkObjectResult(data);
}
}
}