C Enum - How to Compare Value

Question

How can I compare the value of this enum  public enum AccountType       Retailer   1      Customer   2      Manager   3      Employee   4     I am trying to compare the value of this enum in an MVC4 controller like so   if  userProfile AccountType ToString       Retailer         return RedirectToAction  Create    Retailer      return RedirectToAction  Index    Home      I also tried this  if  userProfile AccountType Equals 1         return RedirectToAction  Create    Retailer      return RedirectToAction  Index    Home      In each case I get an Object reference not set to an instance of an object

User · Answer

You should convert the string to an enumeration value before comparing   Enum TryParse  Retailer   out AccountType accountType     Then  if  userProfile  AccountType    accountType          your code

User · Answer

You can use Enum Parse like  if it is string  AccountType account    AccountType Enum Parse typeof AccountType    Retailer

User · Answer

You can use extension methods to do the same thing with less code   public enum AccountType       Retailer   1      Customer   2      Manager   3      Employee   4    static class AccountTypeMethods       public static bool IsRetailer this AccountType ac                return ac    AccountType Retailer            And to use   if  userProfile AccountType isRetailer            your code     I would recommend to rename the AccountType to Account  It s not a name convention

User · Answer

use this  if  userProfile AccountType    AccountType Retailer                 If you want to get int from your AccountType enum and compare it  don t know why  do this   if  int userProfile AccountType    1                  Objet reference not set to an instance of an object exception is because your userProfile is null and you are getting property of null  Check in debug why it s not set   EDIT  thanks to  Rik and  KonradMorawski     Maybe you can do some check before   if userProfile  null        or   if userProfile  null       throw new ArgumentNullException nameof userProfile       or any other exception

User · Answer

Comparision   if  userProfile AccountType    AccountType Retailer          your code     In case to prevent the NullPointerException you could add the following condition before comparing the AccountType   if userProfile    null        if  userProfile AccountType    AccountType Retailer                 your code           or shorter version   if  userProfile   null  amp  amp  userProfile AccountType    AccountType Retailer          your code

[c#] C# Enum - How to Compare Value

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