c＃URL POST Web API

Question

I'm trying to do a function which work with WECHAT API, Here is my code:

I use the code below to get a connection Token

internal static string Token(string CorpID, string Secret)
    {
        CorpID = CorpID ?? "wwe1f80304633";
        Secret = Secret ?? "Ev7_oVN7RqD9k4yUy5pzkfcZ_QhX9l0VjZnAQ";

        string token;
        using (var wc = new WebClient())
        {
            token = wc.DownloadString($"https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={CorpID}&corpsecret={Secret}");
        }
        if (token.Contains("access_token"))
        {
            return token.Split(',')[2].Split(':')[1].Replace("\"", "");
        }
        return "";
    }

It's successful to get a valid token from WECHAT Server,

And the code below is I want to POST a request to WECHAT API and ask WECHAT to Send Message to selected Department Person.

internal static string SendMsg(string sendtext)
    {

        string ACTOKEN = "" + PDC.MSGTOKEN + "";
        string CONTENT = "" + PDC.CONTENT + "";
        string PostUrl;
        using (var wc2 = new WebClient())
        {
            PostUrl = wc2.UploadString($"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}{1}", ACTOKEN, CONTENT);
        }


        return "";
    }

public static void SendMsg2()
    {

        PDC.CONTENT = "Test Message";
        string MsgContent = "{\"toparty\": \"" + PDC.DEPTID + "\",\"msgtype\": \"text\",\"agentid\": \"" + PDC.AGENTID + "\",\"text\": {\"content\": \"" + PDC.CONTENT + "\"},\"safe\":0}";
        SendMsg(MsgContent);

        MessageBox.Show("" + MsgContent + "");
    }

And I Added a button on my WinForm and trying to make it work

private void BtnSendMsg_Click(object sender, EventArgs e)
    {
        string token = MSG.Token(null, null);
        if (!string.IsNullOrEmpty(token))
        {
            PDC.MSGTOKEN = token;
            MessageBox.Show("" + PDC.MSGTOKEN + "");
        }
        else
        {
            MessageBox.Show(" Invalid Token ");
        }

        MSG.SendMsg2();
    }

However seems it doesn't work, and if I'm not wrong the problem on this part

internal static string SendMsg(string sendtext)
    {

        string ACTOKEN = "" + PDC.MSGTOKEN + "";
        string CONTENT = "" + PDC.CONTENT + "";
        string PostUrl;
        using (var wc2 = new WebClient())
        {
            PostUrl = wc2.UploadString($"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}{1}", ACTOKEN, CONTENT);
        }


        return "";
    }

May anyone can give me some ideas how I can solve this problem ? Many Many Many Thanks ~

Answer 1

I has been done my Code without Problem, this is the code below for everyone who need.

The code to get Token from Https API

internal static string Token(string CorpID, string Secret)
    {
        CorpID = CorpID ?? "" + PDC.CorpID + "";
        Secret = Secret ?? "" + PDC.Secret + "";

        string token;
        using (var wc = new WebClient())
        {
            token = wc.DownloadString($"https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={CorpID}&corpsecret={Secret}");
        }
        if (token.Contains("access_token"))
        {
            return token.Split(',')[2].Split(':')[1].Replace("\"", "");
        }
        return "";
    }

The Method of POST

internal static string PostWebRequest(string PostUrl, string ParamData, Encoding DataEncode)
    {
        string ret = string.Empty;
        try
        {
            byte[] byteArray = DataEncode.GetBytes(ParamData);
            HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(PostUrl));
            webReq.Method = "POST";
            webReq.ContentType = "application/x-www-form-urlencoded";

            webReq.ContentLength = byteArray.Length;
            Stream newStream = webReq.GetRequestStream();
            newStream.Write(byteArray, 0, byteArray.Length);
            newStream.Close();
            HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
            ret = sr.ReadToEnd();
            sr.Close();
            response.Close();
            newStream.Close();
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
        return ret;
    }

The code to using WECHAT WORK for sending Message

internal static string SendMsg(string CorpID, string Secret, string ParamData, Encoding DataEncode)
    {
        string AccessToken = Token(CorpID, Secret);
        string PostUrl = string.Format("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}", AccessToken);

        return PostWebRequest(PostUrl, ParamData, DataEncode);
    }

public static void SendMsg2()
    {
        string sCorpID = "" + PDC.CorpID + "";
        string sSecret = "" + PDC.Secret + "";
        PDC.CONTENT = "Test Message";

        string Message = "Test";


        string MsgContent = "{";
        MsgContent += "\"totag\": \"" + PDC.DEPTID + "\",";
        MsgContent += "\"msgtype\": \"text\",";
        MsgContent += "\"agentid\": \"" + PDC.AGENTID + "\",";
        MsgContent += "\"text\": {";
        MsgContent += "  \"content\": \"" + Message + "\"";
        MsgContent += "},";
        MsgContent += "\"safe\":\"0\"";
        MsgContent += "}";

        SendMsg(sCorpID, sSecret, MsgContent, Encoding.UTF8);
    }

The Button Event for active Send Message Function

private void BtnSendMsg_Click(object sender, EventArgs e)
    {
        string token = MSG.Token(null, null);
        if (!string.IsNullOrEmpty(token))
        {
            PDC.MSGTOKEN = token;
        }

        MSG.SendMsg2();
    }