无法在C# .Net框架中使用参数调用HttpGet方法

using System;
using System.Net.Http;

class Program
{
    static async System.Threading.Tasks.Task Main(string[] args)
    {
        // 创建HttpClient实例
        using (HttpClient client = new HttpClient())
        {
            // 构建请求URL，将参数拼接在URL中
            string url = "https://example.com/api?param1=value1&param2=value2";

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

            // 检查响应状态码
            if (response.IsSuccessStatusCode)
            {
                // 读取响应内容
                string result = await response.Content.ReadAsStringAsync();
                
                // 处理响应数据
                Console.WriteLine(result);
            }
            else
            {
                Console.WriteLine("请求失败: " + response.StatusCode);
            }
        }
    }
}