主类

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace hyjk.Commons
{
    public class Class_cUrl
    {
        private string args = "";
        /// <summary>
        /// 参数
        /// </summary>
        public string Args { get { return args; } set { args = value; } }

        /// <summary>
        /// 设置参数
        /// </summary>
        /// <param name="value">参数值</param>
        public void SetArg(string value)
        {
            if (string.IsNullOrEmpty(args)) { args = value; } else { args += " " + value; }
        }
        ProcessStartInfo processStartInfo = new ProcessStartInfo();
        Process process = new Process();
        //将cmd的标准输入和输出全部重定向到.NET的程序里
        #region 运行
        /// <summary>
        /// 运行
        /// </summary>
        /// <returns></returns>
        public string Run()
        {
            processStartInfo.UseShellExecute = false;
            processStartInfo.RedirectStandardInput = true;
            processStartInfo.RedirectStandardOutput = true;
            processStartInfo.RedirectStandardError = false;
            processStartInfo.CreateNoWindow = true;
            processStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            processStartInfo.FileName = @"curl.exe";
            processStartInfo.Arguments = args;
            try
            {
                process = Process.Start(processStartInfo);
            }
            catch
            {
                return process.StandardError.ReadToEnd();
            }
            string resaultValue = process.StandardOutput.ReadToEnd();
            process.WaitForExit();
            process.Close();
            return resaultValue;

        }
        #endregion 运行
        
      
    }
}

调用

public static TcURL(){
Class_cUrl c = new Class_cUrl();
                string arg = "-XPOST -T body.txt " + url + " -k --output ret.txt -s --show-error";
                c.SetArg(arg);
                c.Run();
}