将数组添加到POST参数C#

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

class Program
{
    static async Task Main(string[] args)
    {
        using (HttpClient client = new HttpClient())
        {
            var values = new Dictionary<string, string[]>
            {
                { "arrayParam", new string[] { "value1", "value2", "value3" } }
            };

            var content = new FormUrlEncodedContent(values);

            var response = await client.PostAsync("http://example.com/api", content);

            var responseContent = await response.Content.ReadAsStringAsync();

            Console.WriteLine(responseContent);
        }
    }
}

using System;
using System.Collections.Specialized;
using System.Net;

class Program
{
    static void Main(string[] args)
    {
        using (var client = new WebClient())
        {
            var values = new NameValueCollection
            {
                { "arrayParam", "value1,value2,value3" }
            };

            var response = client.UploadValues("http://example.com/api", values);

            var responseContent = System.Text.Encoding.Default.GetString(response);

            Console.WriteLine(responseContent);
        }
    }
}