PostAsync删除"+“字符

var str = "Hello+World";
str = str.replace(/\+/g, "");
console.log(str); // 输出：HelloWorld

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

public class Program
{
    public static async Task Main()
    {
        string url = "http://example.com";
        string data = "Hello+World";

        using (HttpClient client = new HttpClient())
        {
            var content = new StringContent(data.Replace("+", ""), System.Text.Encoding.UTF8, "application/x-www-form-urlencoded");
            var response = await client.PostAsync(url, content);
            var result = await response.Content.ReadAsStringAsync();
            Console.WriteLine(result);
        }
    }
}