.net core 微信公众号开发（一）

 1         [Route("wechat")]
 2         [HttpGet]
 3         public ActionResult WechatValidation(string echoStr,string signature,string timestamp,string nonce)
 4         {
 5             string filename = "1.text";
 6             string webRootPath = _hostingEnvironment.WebRootPath;
 7             string contentRootPath = _hostingEnvironment.ContentRootPath;
 8             string fullpath = Path.Combine(webRootPath, filename);
 9             if (!System.IO.File.Exists(fullpath))
10             {
11                 System.IO.File.Create(fullpath).Close();
12             }
13 
14             System.IO.File.AppendAllText(fullpath, $"\r\nTime:{DateTime.Now},string echoStr:{echoStr},string signature:{signature},string timestamp:{timestamp},string nonce:{nonce}");
15             
16             var token = "wechat";
17             var checkResult = CheckSignature(token, signature, timestamp, nonce);
18             return Content(echoStr);
19         }
20 
21         
22         private bool CheckSignature(string token, string signature, string timestamp, string nonce)
23         {
24    
25             //创建数组，将 Token, timestamp, nonce 三个参数加入数组
26             string[] array = { token, timestamp, nonce };
27             //进行排序
28             Array.Sort(array);
29             //拼接为一个字符串
30             var  tempStr = String.Join("", array);
31             //对字符串进行 SHA1加密
32             tempStr = Get_SHA1_Method2(tempStr);
33             //判断signature 是否正确
34             if (tempStr.Equals(signature))
35             {
36                 return true;
37             }
38             else
39             {
40                 return false;
41             }
42         }
43 
44         public string Get_SHA1_Method2(string strSource)
45         {
46             string strResult = "";
47 
48             //Create 
49             System.Security.Cryptography.SHA1 md5 = System.Security.Cryptography.SHA1.Create();
50 
51             //注意编码UTF8、UTF7、Unicode等的选择 
52             byte[] bytResult = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strSource));
53 
54             //字节类型的数组转换为字符串 
55             for (int i = 0; i < bytResult.Length; i++)
56             {
57                 //16进制转换 
58                 strResult = strResult + bytResult[i].ToString("X");
59             }
60             return strResult.ToLower();
61         }