C# 微信接口之推送模版消息

public string SendTempletMessge()
{
string strReturn = string.Empty;
try
{
#region 获取access_token
string apiurl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的secret";
WebRequest request = WebRequest.Create(@apiurl);
request.Method = "POST";
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
Encoding encode = Encoding.UTF8;
StreamReader reader = new StreamReader(stream, encode);
string detail = reader.ReadToEnd();
var jd = JsonConvert.DeserializeObject<WXApi>(detail);
string token = (String)jd.access_token;
#endregion

#region 组装信息推送，并返回结果（其它模版消息于此类似）
string url = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=" + token;
string temp = "{\"touser\": \"" + UserInfo.OpenID + "\"," +
"\"template_id\": \"f3kRRjJeyLDf4tndtg-OJeRvgEdgjjDxCy4T9kuwM70\", " +
"\"topcolor\": \"#FF0000\", " +
"\"data\": " +
"{\"first\": {\"value\": \"您好，您有一条回款通知信息\"}," +
"\"keyword1\": { \"value\": \"单位名称\"}," +
"\"keyword2\": { \"value\": \"日期\"}," +
"\"keyword3\": { \"value\": \"金额\"}," +
"\"keyword4\": { \"value\": \"业务员\"}," +
"\"remark\": {\"value\": \"\" }}}";

#endregion

//核心代码
GetResponseData(temp, @url);
strReturn = "推送成功";
}
catch (Exception ex)
{
strReturn = ex.Message;
}
return strReturn;
}

/// <summary>
/// 返回JSon数据
/// </summary>
/// <param name="JSONData">要处理的JSON数据</param>
/// <param name="Url">要提交的URL</param>
/// <returns>返回的JSON处理字符串</returns>
public string GetResponseData(string JSONData, string Url)
{
byte[] bytes = Encoding.UTF8.GetBytes(JSONData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "POST";
request.ContentLength = bytes.Length;
request.ContentType = "json";
Stream reqstream = request.GetRequestStream();
reqstream.Write(bytes, 0, bytes.Length);

//声明一个HttpWebRequest请求
request.Timeout = 90000;
//设置连接超时时间
request.Headers.Set("Pragma", "no-cache");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream streamReceive = response.GetResponseStream();
Encoding encoding = Encoding.UTF8;

StreamReader streamReader = new StreamReader(streamReceive, encoding);
string strResult = streamReader.ReadToEnd();
streamReceive.Dispose();
streamReader.Dispose();
return strResult;
}
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涉及到的实体：
public class WXApi
{
public string access_token { set; get; }
}