前言：最近公司项目与外部api接口对接较多 ，写下自己的代码总结。介绍两种访问方式（HttpClient、HttpWebRequest）

一、HttpWebRequest 访问Api

private static string webPost(string url, string obj = null)        {            string param = (obj);//参数            byte[] bs = Encoding.Default.GetBytes(param);            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);            req.Method = "POST";            req.ContentType = "application/json";            req.ContentLength = bs.Length;            using (Stream reqStream = req.GetRequestStream())            {                reqStream.Write(bs, 0, bs.Length);                reqStream.Close();                HttpWebResponse response2 = (HttpWebResponse)req.GetResponse();                StreamReader sr2 = new StreamReader(response2.GetResponseStream(), Encoding.UTF8);                string result = sr2.ReadToEnd();                return result;            }        }

 

二、HttpClient访问Api

/// 
 /// Get请求 /// 
 public string GetToken()

{

try            {                HttpClient myHttpClient = new HttpClient();                var urlstring = "https://oapi.dingtalk.com/gettoken?appkey=APPKEY&appsecret=APPSECRET";                urlstring = urlstring.Replace("APPKEY", appkey);                urlstring = urlstring.Replace("APPSECRET", appsecret);                HttpResponseMessage response = myHttpClient.GetAsync(urlstring).Result;                var content = response.Content.ReadAsAsync

 

/// 
/// Post请求/// 
 public string getList(long unixstart, long unixend, int cursor, bool start) {            try            {                HttpClient myHttpClient = new HttpClient();                var urlstring = "https://oapi.dingtalk.com/topapi/processinstance/listids?access_token=ACCESS_TOKEN";                urlstring = urlstring.Replace("ACCESS_TOKEN", access_token);                var content = new FormUrlEncodedContent(new Dictionary
     
      () {                      {
    "process_code",""},                      {
    "start_time", },                      {
    "end_time" ,},                      {
    "size" ,"10"},                      {
    "cursor" ,)}                  });                HttpResponseMessage response = myHttpClient.PostAsync(urlstring, content).Result;                var jsonlist = response.Content.ReadAsAsync
      
     

 

三、时间戳与DateTime互转

/// 
        /// 将c# DateTime时间格式转换为Unix时间戳格式        /// 
        ///         /// 
             public  long ConvertDateTimeInt(DateTime time)        {            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));            long t = (time.Ticks - startTime.Ticks) / 10000;            return t;        }        /// 
        /// c# Unix时间戳格式转换成DateTime        /// 
        ///         /// 
             public  System.DateTime ConvertIntDateTime(long d)        {            System.DateTime time = System.DateTime.MinValue;            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));            time = startTime.AddMilliseconds(d);            return time;        }