将Httpwebrequest转换为Httpclient

// 创建HttpWebRequest对象
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com");

// 设置请求方法和其他属性
request.Method = "GET";
request.Timeout = 10000;

// 发送请求并获取响应
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
    // 读取响应内容
    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
        string content = reader.ReadToEnd();
        Console.WriteLine(content);
    }
}

// 创建HttpClient对象
HttpClient client = new HttpClient();

// 发送GET请求并获取响应
HttpResponseMessage response = await client.GetAsync("http://example.com");

// 确保响应成功
response.EnsureSuccessStatusCode();

// 读取响应内容
string content = await response.Content.ReadAsStringAsync();
Console.WriteLine(content);