C#的WebClient的异常处理和HttpClient有什么区别？

WebException

WebException

HttpWebResponse

HttpRequestException

IsSuccessStatusCode

StatusCode

StatusCode

catch

try-catch

catch

HttpRequestException

HttpRequestException

using System.Net.Http;
using System.Threading.Tasks;
using System;

public class ApiClient
{
    private readonly HttpClient _httpClient;

    public ApiClient(HttpClient httpClient)
    {
        _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
    }

    public async Task<string> GetDataAsync(string url)
    {
        try
        {
            var response = await _httpClient.GetAsync(url);

            // 检查HTTP状态码是否成功
            if (response.IsSuccessStatusCode)
            {
                return await response.Content.ReadAsStringAsync();
            }
            else
            {
                // 处理非成功的HTTP状态码
                Console.WriteLine($"HTTP Request Failed: {response.StatusCode}");
                var errorContent = await response.Content.ReadAsStringAsync();
                Console.WriteLine($"Error Details: {errorContent}");

                // 根据具体状态码进行业务逻辑处理
                if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                {
                    // 资源不存在，可能返回空或特定默认值
                    return "Resource Not Found";
                }
                else if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
                {
                    // 未授权，可能需要刷新Token或重新登录
                    Console.WriteLine("Authentication required.");
                    // throw new UnauthorizedAccessException("User is not authorized."); // 或者抛出自定义业务异常
                    return "Unauthorized";
                }
                else
                {
                    // 对于其他非预期的错误，可以考虑抛出HttpRequestException，
                    // 这样上层调用者可以统一处理所有非2xx的响应
                    response.EnsureSuccessStatusCode(); // 这行代码会抛出HttpRequestException
                    return null; // 理论上不会执行到这里
                }
            }
        }
        catch (HttpRequestException ex)
        {
            // 处理网络层面的异常（DNS解析失败、连接超时等）
            Console.WriteLine($"Network or HTTP request error: {ex.Message}");
            // 可以检查ex.InnerException获取更详细的错误信息
            throw; // 重新抛出，让上层知道发生了网络问题
        }
        catch (Exception ex)
        {
            // 捕获其他可能的异常，比如内容解析失败等
            Console.WriteLine($"An unexpected error occurred: {ex.Message}");
            throw;
        }
    }
}

IsSuccessStatusCode

false

StatusCode

response.EnsureSuccessStatusCode()

IsSuccessStatusCode

false

HttpRequestException

catch (HttpRequestException ex)