C#通过基本认证连接url官方示例

在C#中，你可以使用HttpClient类来通过HTTP基本认证（Basic Authentication）连接URL。下面是一个简单的示例：

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

public class BasicAuthenticationExample
{
    private const string USERNAME = "your_username";
    private const string PASSWORD = "your_password";

    public async Task ConnectWithBasicAuth(string url)
    {
        // 创建HttpClient实例
        var httpClient = new HttpClient();

        try
        {
            // 设置Authorization头，包含Base64编码的用户名和密码
            byte[] credentialsBytes = System.Text.Encoding.UTF8.GetBytes($"{USERNAME}:{PASSWORD}");
            string encodedCredentials = Convert.ToBase64String(credentialsBytes);
            httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", encodedCredentials);

            // 发送GET请求并获取响应
            HttpResponseMessage response = await httpClient.GetAsync(url);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine($"Connected to {url} with basic auth.");
                Console.WriteLine(await response.Content.ReadAsStringAsync());
            }
            else
            {
                Console.WriteLine($"Failed to connect to {url}, status code: {response.StatusCode}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error occurred: {ex.Message}");
        }
    }

    public static void Main()
    {
        string targetUrl = "http://example.com"; // 替换为你需要认证的URL
        BasicAuthenticationExample example = new BasicAuthenticationExample();
        example.ConnectWithBasicAuth(targetUrl).Wait(); // 异步阻塞等待任务完成
    }
}

在这个例子中，你需要替换`USERNAME`和`PASSWORD`为实际的用户名和密码。记得确保你的代码在安全环境下运行，尤其是处理敏感信息时。