//======================================================================
//  HttpHelper
//  ZMF_Demo.ZMF
//
//  Created by Chen Jialuo on 3/2/2017 ‏‎4:21:55 PM.
//  Copyright © 2017 ZHONGMAKEJI. All rights reserved.
//  http://www.zhongmakj.com/
//
//======================================================================

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

namespace MobileServicePlatform.Common
{

    /// <summary>
    /// helper for http get/post
    /// </summary>
    internal sealed class HttpHelper
    {

        /// <summary>
        /// 不需要新建对象，构造函数为私有
        /// </summary>
        private HttpHelper()
        {
            ;
        }

        /// <summary>
        /// 发送HTTP POST
        /// </summary>
        /// <param name="url">目标完整URL</param>
        /// <param name="param">FORM内容</param>
        /// <returns>调用成功则返回接口返回内容；失败时返回null</returns>
        public static string Post(string url, NameValueCollection param)
        {
            try
            {
                using (var client = new WebClient())
                {
                    byte[] result = client.UploadValues(url, "POST", param);
                    return System.Text.Encoding.Default.GetString(result);
                }
            }
            catch
            {
                // TODO: HTTP POST请求发生异常，错误日志写入

                return null;
            }
        }

        public static string Post(string url, Hashtable param)
        {
            NameValueCollection nvc = new NameValueCollection();
            foreach (DictionaryEntry entry in param)
            {
                nvc.Add(entry.Key.ToString(), entry.Value.ToString());
            }
            return Post(url,nvc);
        }
    }
}