如何在用戶輸入電子郵件時驗證電子郵件域名地址以顯示某些項目以顯示在下拉列表菜單中？

Question

我正在一個網站上工作，員工有一個Gmail或雅虎的電子郵件，這決定了他們得到的手機的類型。如果他們進入Gmail賬戶，某些類型的電話（iPhone，Galaxy，Samsung等）應該出現在下拉列表中。同樣應該爲雅虎帳戶工作。 Gmail帳戶的電話類型多於雅虎帳戶。我拿到了文本框並下拉框工作。不過，我需要幫助編寫一個函數來說明gmail或yahoo之間的區別，以確定在用戶輸入電子郵件域時顯示哪些類型的電話。不知道是否需要執行switch語句或正則表達式匹配。

控制器代碼如下：

[Display(Name = "Email Address")] 
[RegularExpression(@"^([a-zA-Z0-9._%+-]{1,50})+(@gmail|@GMAIL|@YAHOO|@yahoo)+(\.)+(com|COM)$", 
     ErrorMessage = "Invalid Email Format. Use: username@gmail.com or username@yahoo.com")] 

[Required(ErrorMessage="Please input gmail or yahoo")] 
public string Email { get; set; } 

視圖代碼如下：從用戶輸入

<div class="col-lg-2 col-md-3 col-sm-3"> 
    @Html.EditorFor(model => model.Email, 
      new { htmlAttributes = 
       new { 
         @class = "form-control", 
         @placeholder = "Email@gmail.com or Email@yahoo.com", 
         data_bind = "value: Request.Email", 
         data_toggle = "tooltip", 
         data_placement = "top", 
         title = "Requestor's Email" } 
    }) 

    @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" }) 
</div> 

dropdowncascade.js //獲取信息

$(document).ready(function() { 
$("#Carriers").change(function() { 
    var carrierId = $(this).val(); 
    var emailAddress = $("#Email").val(); 
    $.getJSON("../Home/LoadPhonesByCarrierId", { carrierid: carrierId, emailaddress: emailAddress }, //reads what carrier id and the email from the user input 
      function (phonesData, accsData) { 
       var select = $("#Phones"); 
       select.empty(); 
       select.append($('<option/>', { 
        value: 0, 
        text: "Select a Phone" 
       })); 
       $.each(phonesData, function (index, itemData) { 
        select.append($('<option/>', { 
         value: itemData.Value, 
         text: itemData.Text 
        })); 
       }); 
      }); 
}); 

幫助與HomeControllers功能的.cs！ //需要匹配電子郵件域以確定在下拉列表中顯示哪些電話類型。

  public JsonResult LoadPhonesByCarrierId(string carrierid, string email) 
    { 
     // string Email = txt.Text; 
     //The email difference swicth statement 
     //if(Regex.IsMatch(Email, @"^([a-zA-Z0-9._%+-]{1,50})(@gmail|@GMAIL)(\.)(com|COM)$")) 
     string pattern = @"^([a-zA-Z0-9._%+-]{1,50})(@gmail|@GMAIL)(\.)(com|COM)$"; 
     string input = "mvilleda@gmail.com"; 
     Match match = Regex.Match(input, pattern); 
      if (match.Success) 
     { 
      var com = from c in db.Phones 
         where c.CommerceAllowed == true 
         select c; 

     } 
      else 
     { 
      var gov = from g in db.Phones 
         where g.GovAllowed == true 
          select g; 
     } 

     var phonesList = this.GetPhones(Convert.ToInt32(carrierid)); 
     var phonesData = phonesList.Select(m => new SelectListItem() 
     { 
      Text = m.Name, 
      Value = m.PhoneID.ToString(), 
     }); 
     return Json(phonesData, JsonRequestBehavior.AllowGet); 
    } 

Answer 1

 public JsonResult LoadPhonesByCarrierId(string carrierid, string emailaddress) 
     { 
     string pattern = @"^([a-zA-Z0-9._%+-]{1,50})(@gmail|GMAIL)(\.)(com|COM)$"; 
     Match match = Regex.Match(emailaddress, pattern);//checks the email address from user and pattern. 
     if (match.Success)//if true it will do the following 
     { 
         var gov = from g in db.Phones 
         where g.GovAllowed == true 
         select g; 
     } 
     else 
     { 
         var com = from c in db.Phones 
         where c.CommerceAllowed == true 
         select c; 
     } 


    var phonesList = this.GetPhones(Convert.ToInt32(carrierid)); 
    var phonesData = phonesList.Select(m => new SelectListItem() 
    { 
     Text = m.Name, 
     Value = m.PhoneID.ToString(), 
    }); 
    return Json(phonesData, JsonRequestBehavior.AllowGet); 
} 

Answer 2

我真的不明白什麼是這裏的關鍵點。首先，假設與e-Mail模式已被選中，所以要檢查的唯一事情是域。一個非常可靠的方法是檢查你將存儲在數據庫/數據庫上下文中的域列表。

如果你想要一個簡單，快速和骯髒的解決方案，創建兩個列表，並檢查它們。

var eMailProviders = new Dictionary<int, string[]>(); 

    eMailProviders.Add(1, new []{ "gmail.com", "googlemail.com" }); 
    eMailProviders.Add(2, new []{ "yahoo.com", "yahoomail.com" }); // I don't know the domains... 

    var email = "something754849@gmail.com"; 

    var providerId = eMailProviders 
     .Where(x => x.Value.Any(domain => email.EndsWith(domain))) 
     .Select(x => x.Key) 
     .FirstOrDefault(); 

    Console.WriteLine(providerId); 

Fiddle

還是因爲我得到的問題，錯了嗎？當然，這是一個硬編碼的解決方案，但是你得到了Idea，這可以傳送到你的數據庫。此外，你可以嘗試做出正則表達式的決定，但爲什麼要麻煩？很容易就搞亂了正則表達式，很難反映所有的域選項。