Update README.md

README.md

@@ -188,6 +188,73 @@ sendToWecom({
   })
 ```
 
+.NET Core 版:
+
+```C#
+using System;
+using RestSharp;
+using Newtonsoft.Json;
+namespace WeCom.Demo
+{
+    class WeCom
+    {   
+        public  string SendToWeCom(
+            string text,// 推送消息
+            string weComCId,// 企业Id①
+            string weComSecret,// 应用secret②
+            string weComAId,// 应用ID③
+            string weComTouId = "@all")
+        {
+            // 获取Token
+            string getTokenUrl = $"https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={weComCId}&corpsecret={weComSecret}";
+            string token = JsonConvert
+            .DeserializeObject<dynamic>(new RestClient(getTokenUrl)
+            .Get(new RestRequest()).Content).access_token;
+            System.Console.WriteLine(token);
+            if (!String.IsNullOrWhiteSpace(token))
+            {
+                var request = new RestRequest();
+                var client = new RestClient($"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={token}");
+                var data = new
+                {
+                    touser = weComTouId,
+                    agentid = weComAId,
+                    msgtype = "text",
+                    text = new
+                    {
+                        content = text
+                    },
+                    duplicate_check_interval = 600
+                };
+                string serJson = JsonConvert.SerializeObject(data);
+                System.Console.WriteLine(serJson);
+                request.Method = Method.POST;
+                request.AddHeader("Accept", "application/json");
+                request.Parameters.Clear();
+                request.AddParameter("application/json", serJson, ParameterType.RequestBody);
+                return client.Execute(request).Content;
+            }
+            return "-1";
+        }
+}
+
+
+```
+使用实例:
+```C#
+   static void Main(string[] args)
+        {   // 测试
+            Console.Write(new WeCom().SendToWeCom(
+            "msginfo",
+            "企业Id①"
+            , "应用secret②",
+            "应用ID③"
+            ));
+        }
+
+    }
+```
+
 其他版本的函数可参照上边的逻辑自行编写，欢迎PR。