Conversion of System Array to List

Question

Last night I had dream that the following was impossible  But in the same dream  someone from SO told me otherwise   Hence I would like to know if it it possible to convert System Array to List  Array ints   Array CreateInstance typeof int   5   ints SetValue 10  0   ints SetValue 20  1   ints SetValue 10  2   ints SetValue 34  3   ints SetValue 113  4     to  List lt int gt  lst   ints OfType lt int gt        not working

User · Answer

I know two methods  List lt int gt  myList1   new List lt int gt  myArray    Or  List lt int gt  myList2   myArray ToList     I m assuming you know about data types and will change the types as you please

User · Answer

You can just give it try to your code   Array ints   Array CreateInstance typeof int   5   ints SetValue 10  0    ints SetValue 20  1   ints SetValue 10  2   ints SetValue 34  3   ints SetValue 113  4    int   anyVariable  int   ints    Then you can just use the anyVariable as your code

User · Answer

I hope this is helpful   enum TESTENUM               T1   0          T2   1          T3   2          T4   3         get string value  string enumValueString    T1            List lt string gt  stringValueList    typeof TESTENUM  GetEnumValues   Cast lt object gt    Select m   gt               Convert ToString m                ToList             if  stringValueList Exists m   gt  m    enumValueString                         throw new Exception  cannot find type                       TESTENUM testEnumValueConvertString          Enum TryParse lt TESTENUM gt  enumValueString  out testEnumValueConvertString     get integer value          int enumValueInt   1           List lt int gt  enumValueIntList    typeof TESTENUM  GetEnumValues   Cast lt object gt    Select m   gt              Convert ToInt32 m                ToList             if  enumValueIntList Exists m   gt  m    enumValueInt                         throw new Exception  cannot find type                       TESTENUM testEnumValueConvertInt          Enum TryParse lt TESTENUM gt  enumValueString  out testEnumValueConvertInt

User · Answer

You can do like this basically   int   ints   new     10  20  10  34  113      this is your array  and than you can call your new list like this    var newList   new List lt int gt  ints     You can do this for complex object too

User · Answer

in vb net just do this  mylist addrange intsArray    or  Dim mylist As New List Of Integer  intsArray

User · Answer

Interestingly no one answers the question  OP isn t using a strongly typed int   but an Array    You have to cast the Array to what it actually is  an int    then you can use ToList    List lt int gt  intList     int   ints  ToList      Note that Enumerable ToList calls the list constructor that first checks if the argument can be casted to ICollection lt T gt  which an array implements   then it will use the more efficient ICollection lt T gt  CopyTo method instead of enumerating the sequence

User · Answer

There is also a constructor overload for List that will work    But I guess this would required a strong typed array     public List IEnumerable lt T gt  collection  var intArray   new     1  2  3  4  5    var list   new List lt int gt  intArray         for Array class  var intArray   Array CreateInstance typeof int   5   for  int i   0  i  lt  5  i        intArray SetValue i  i   var list   new List lt int gt   int   intArray

User · Answer

Just use the existing method    ToList        List lt int gt  listArray   array ToList      KISS KEEP IT SIMPLE SIR

User · Answer

In the case you want to return an array of enums as a list you can do the following   using System Linq   public List lt DayOfWeek gt  DaysOfWeek     get         return Enum GetValues typeof DayOfWeek                   OfType lt DayOfWeek gt                    ToList

User · Answer

The simplest method is   int   ints   new      10  20  10  34  113     List lt int gt  lst   ints ToList      or  List lt int gt  lst   new List lt int gt     lst AddRange ints

User · Answer

Save yourself some pain     using System Linq   int   ints   new      10  20  10  34  113     List lt int gt  lst   ints OfType lt int gt    ToList       this isn t going to be fast    Can also just     List lt int gt  lst   new List lt int gt    10  20  10  34  113      or     List lt int gt  lst   new List lt int gt     lst Add 10   lst Add 20   lst Add 10   lst Add 34   lst Add 113     or     List lt int gt  lst   new List lt int gt  new int     10  20  10  34  113       or     var lst   new List lt int gt     lst AddRange new int     10  20  10  34  113

[c#] Conversion of System.Array to List

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