C# (PDF4.8框架)如何将.Net POST调用中的查询字符串参数从header更改为body并在新选项卡中打开PDF

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

public class Program
{
    public static async Task Main(string[] args)
    {
        string url = "https://example.com/api/generate-pdf";
        string queryString = "?param1=value1&param2=value2";

        // 创建请求体
        var requestBody = new StringContent($"{{\"param1\":\"value1\",\"param2\":\"value2\"}}", Encoding.UTF8, "application/json");

        using (var client = new HttpClient())
        {
            // 发送POST请求
            var response = await client.PostAsync(url, requestBody);

            if (response.IsSuccessStatusCode)
            {
                // 获取PDF内容
                var pdfContent = await response.Content.ReadAsStringAsync();

                // 在新选项卡中打开PDF
                var pdfUrl = $"data:application/pdf;base64,{Convert.ToBase64String(Encoding.UTF8.GetBytes(pdfContent))}";
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo("chrome", pdfUrl) { CreateNoWindow = true });
            }
            else
            {
                Console.WriteLine($"请求失败，状态码: {response.StatusCode}");
            }
        }
    }
}