Question

我有这种反复出现的方法，我需要转换为通用方法。我正在使用.net core 2.0，我正在创建一组调用远程API的新API。我将在角度前端使用结果数据，并启用远程API无法提供的身份验证和授权。重复代码类似于ff：

[HttpGet("getAddressBook")]
public async Task<IActionResult> GetAddressBook()
{
    string BaseURL = Configuration.GetSection("AppSettings:BaseURL").Value;
    AddressBookRootObject AddressBookInfo = new AddressBookRootObject();

    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(BaseURL);

        client.DefaultRequestHeaders.Clear();

        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage Res = await client.GetAsync("/v1/addressBook_get");

        if (Res.IsSuccessStatusCode) 
        {
            var ParametersResponse = Res.Content.ReadAsStringAsync().Result;

            AddressBookInfo = JsonConvert.DeserializeObject<AddressBookRootObject>(ParametersResponse);
        }
        else 
        {
            return BadRequest("Error retrieving data from server");
        }

        return Ok(AddressBookInfo.data);
    }       
}

我对此代码没有任何问题，它运行完美但我需要将其转换为通用方法，因为我有大量使用上述代码的远程API调用。我查看了这个链接：

Converting Method to Generic Method?

但我无法弄清楚如何转换

AddressBookRootObject AddressBookInfo = new AddressBookRootObject();

到通用的。任何帮助都非常感谢。 TIA。

Answer 1

创建所需功能的简单Web服务抽象

public interface IHttpClient {
    Task<T> GetAsync<T>(string uri);
}

使用实现封装操作中的常用功能。

public class WebService: IHttpClient {
    private readonly HttpClient client;

    public WebService(IConfiguration configuration) {
        string BaseURL = configuration.GetSection("AppSettings:BaseURL").Value;
        client = new HttpClient();
        client.BaseAddress = new Uri(BaseURL);
        client.DefaultRequestHeaders.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    }

    public async Task<T> GetAsync<T>(string url) {
        var result = default(T);
        var response = await client.GetAsync(url);
        if (response.IsSuccessStatusCode) {
            var json = await response.Content.ReadAsStringAsync();
            result = JsonConvert.DeserializeObject<T>(json);
        }
        return result         
    }
}

控制器将注入服务并重构操作

private readonly IHttpClient client;
public AddressBookController(IHttpClient client) {
    this.client = client;
}

[HttpGet("getAddressBook")]
public async Task<IActionResult> GetAddressBook() { 
    var AddressBookInfo = await client.GetAsync<AddressBookRootObject>("/v1/addressBook_get");
    if (AddressBookInfo != null) {
        return Ok(AddressBookInfo.data);
    } else  {
        return BadRequest("Error retrieving data from atCom server");
    }
}

可以根据需要更新抽象以包含更多常用功能。

最后确保在服务器集合中注册了抽象和实现。

services.AddSingleton<IHttpClient, WebService>();

转换为通用方法

1 个答案: