How to get enum value by string or int

Question

How can I get the enum value if I have the enum string or enum int value  eg  If  i have an enum as follows   public enum TestEnum       Value1   1      Value2   2      Value3   3     and in some string variable I have the value  value1  as follows   string str    Value1     or in some int variable I have the value 2 like   int a   2    how can I get the instance of enum   I want a generic method where I can provide the enum and my input string or int value to get the enum instance

User · Answer

Following is the method in C  to get the enum value by string                  Method to get enumeration value from string value               public T GetEnumValue lt T gt  string str  where T   struct  IConvertible       if   typeof T  IsEnum                throw new Exception  T must be an Enumeration type               T val     T   Enum GetValues typeof T    0       if   string IsNullOrEmpty str                 foreach  T enumValue in  T   Enum GetValues typeof T                          if  enumValue ToString   ToUpper   Equals str ToUpper                                   val   enumValue                  break                                     return val      Following is the method in C  to get the enum value by int           Method to get enumeration value from int value               public T GetEnumValue lt T gt  int intValue  where T   struct  IConvertible       if   typeof T  IsEnum                throw new Exception  T must be an Enumeration type               T val     T   Enum GetValues typeof T    0        foreach  T enumValue in  T   Enum GetValues typeof T                  if  Convert ToInt32 enumValue  Equals intValue                         val   enumValue              break                                   return val      If I have an enum as follows     public enum TestEnum       Value1   1      Value2   2      Value3   3     then I can make use of above methods as   TestEnum reqValue   GetEnumValue lt TestEnum gt   Value1        Output  Value1 TestEnum reqValue2   GetEnumValue lt TestEnum gt  2             OutPut  Value2   Hope this will help

User · Answer

Could be much simpler if you use TryParse or Parse and ToObject methods   public static class EnumHelper       public static  T GetEnumValue lt T gt  string str  where T   struct  IConvertible               Type enumType   typeof T           if   enumType IsEnum                        throw new Exception  T must be an Enumeration type                       T val          return Enum TryParse lt T gt  str  true  out val    val   default T              public static T GetEnumValue lt T gt  int intValue  where T   struct  IConvertible               Type enumType   typeof T           if   enumType IsEnum                        throw new Exception  T must be an Enumeration type                        return  T Enum ToObject enumType  intValue             As noted by  chrfin in comments  you can make it an extension method very easily just by adding this before the parameter type which can be handy

User · Answer

I think you forgot the generic type definition   public T GetEnumValue lt T gt  int intValue  where T   struct  IConvertible     lt T gt  added   and you can improve it to be most convinient like e g    public static T ToEnum lt T gt  this string enumValue    where T   struct  IConvertible       return  T Enum Parse typeof T   enumValue       then you can do   TestEnum reqValue    Value1  ToEnum lt TestEnum gt

User · Answer

You could use following method to do that   public static Output GetEnumItem lt Output  Input gt  Input input                  Output type checking            if  typeof Output  BaseType    typeof Enum               throw new Exception  Exception message                  Input type checking  string type         if  typeof Input     typeof string               return  Output Enum Parse typeof Output    dynamic input              Input type checking  Integer type         if  typeof Input     typeof Int16                 typeof Input     typeof Int32                 typeof Input     typeof Int64                return  Output  dynamic input           throw new Exception  Exception message               Note this method only is a sample and you can improve it

User · Answer

From SQL database get enum like   SqlDataReader dr   selectCmd ExecuteReader    while  dr Read         EnumType et    EnumType Enum Parse typeof EnumType   dr GetString 0

User · Answer

Here is an example to get string value      public enum Suit               Spades   0x10          Hearts   0x11          Clubs   0x12          Diamonds   0x13            private void print suit                 foreach  var  suit in Enum GetValues typeof Suit                          int suitValue    byte  Suit Enum Parse typeof Suit    suit ToString                 MessageBox Show  suit ToString       value is 0x    suitValue ToString  X2                             Result of Message Boxes     Spade value is 0x10     Hearts value is 0x11     Clubs value is 0x12     Diamonds value is 0x13

User · Answer

No  you don t want a generic method  This is much easier   MyEnum myEnum    MyEnum myInt   MyEnum myEnum    MyEnum Enum Parse typeof MyEnum   myString     I think it will also be faster

User · Answer

There are numerous ways to do this  but if you want a simple example  this will do   It just needs to be enhanced with necessary defensive coding to check for type safety and invalid parsing  etc            lt summary gt          Extension method to return an enum value of type T for the given string           lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt  lt  param gt           lt returns gt  lt  returns gt      public static T ToEnum lt T gt  this string value                return  T  Enum Parse typeof T   value  true                   lt summary gt          Extension method to return an enum value of type T for the given int           lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt  lt  param gt           lt returns gt  lt  returns gt      public static T ToEnum lt T gt  this int value                var name   Enum GetName typeof T   value           return name ToEnum lt T gt

User · Answer

Simply try this   It s another way   public enum CaseOriginCode       Web   0      Email   1      Telefoon   2    public void setCaseOriginCode string CaseOriginCode        int caseOriginCode    int  CaseOriginCode Enum Parse typeof CaseOriginCode   CaseOriginCode

User · Answer

Try something like this    public static TestEnum GetMyEnum this string title                            EnumBookType st              Enum TryParse title  out st               return st                         So you can do   TestEnum en    Value1  GetMyEnum

[c#] How to get enum value by string or int

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