检测邮箱地址是否存在[C#]

[检测某个邮箱地址是否存在]
CheckEmail
 1 public  class CheckEmail
 2 {
 3     private static string mailQQ = "http://emailreg.qq.com/cgi-bin/signup/ajaxcheckmail?type=1&email={0}";
 4     private static string mailFox = "http://emailreg.qq.com/cgi-bin/signup/ajaxcheckmail?type=3&email={0}"; 
 5     private static string mail163 = "http://reg.email.163.com/mailregAll/checkuname.do?uname={0}g&random={1}";
 6     public static bool IsExist(string email)
 7     {
 8         return NoExist(email) ? false : true;
 9     }
10     public static bool NoExist(string email)
11     {
12         if (email.IndexOf("@") > 0)
13         {
14             string end = email.Substring(email.IndexOf("@") + 1);
15             switch (end)
16             {
17                 case "qq.com": return CheckMailQQ(email);
18                 case "foxmail.com": return CheckMailFox(email);
19                 case "163.com": return CheckMail163(email, EnumMail163.mail163) || CheckMail163(email, EnumMail163.vip163);
20                 case "126.com": return CheckMail163(email, EnumMail163.mail126) || CheckMail163(email, EnumMail163.vip126);
21                 case "yeah.net": return CheckMail163(email, EnumMail163.mailyeah);                     
22             }
23         }
24         return false;
25     }
26     
27 //wang@qq.com
28 public static bool CheckMailQQ(string email)
29     {
30         string url = string.Format(mailQQ, email);
31         var doc = GetXmlData(url);
32         if (doc.Descendants("result").FirstOrDefault() != null)
33         {
34             return doc.Descendants("result").FirstOrDefault().Value.Trim()== "0";
35         }
36         return false;
37 
38     }
39     //dfasdfds@foxmail.com
40     public static bool CheckMailFox(string email)
41     {
42         string url = string.Format(mailFox, email);
43         var doc = GetXmlData(url);
44         if (doc.Descendants("result").FirstOrDefault() != null)
45         {
46             return doc.Descendants("result").FirstOrDefault().Value.Trim() == "0";
47         }
48         return false;
49 
50     }
51 private static bool CheckMail163(string email, EnumMail163 type)
52     {
53         Random rnd = new Random();
54         string name = email.Substring(0, email.LastIndexOf("@"));
55         string url = string.Format(mail163, name,(rnd.Next()*0.00000001).ToString());
56         var dic = GetKeyValueData(url);
57         if (dic.ContainsKey(type.ToString()))
58             return bool.Parse(dic[type.ToString()]);             
59         return false;
60 
61     }
62     private static IDictionary<string, string>  GetKeyValueData(string requestUrl)
63     {
64         IDictionary<string, string> valueDic = new Dictionary<string, string>();
65         valueDic.Clear();
66         var request = HttpWebRequest.Create(requestUrl) as HttpWebRequest;
67         var response = request.GetResponse() as HttpWebResponse;
68         using (var sr = new StreamReader(response.GetResponseStream()))
69         {
70         var result=sr.ReadToEnd();
71         var valueArray = result.Split(new char[] { ',',':'});
72         for (int i = 0; i < valueArray.Length;i+= 2)
73             valueDic.Add(valueArray[i], valueArray[i + 1]);                  
74         }
75         return valueDic;
76     }
77 private static XDocument GetXmlData(string requestUrl)
78 {
79     XDocument doc = null;
80     var request = HttpWebRequest.Create(requestUrl) as HttpWebRequest;
81     var response = request.GetResponse() as HttpWebResponse;
82     using (var sr = new StreamReader(response.GetResponseStream()))
83     {
84         doc = XDocument.Parse(sr.ReadToEnd());
85     }
86     return doc;
87 }
88 }
89 
90 public enum EnumMail163
91 {   mail163,
92     mail126,
93     mailyeah,
94     vip163,
95     vip126,
96     vip188
97 }
检测 邮箱地址 是否存在[C#]

检测邮箱地址是否存在[C#]
