Convert string to int in one line of code using LINQ

Question

I have an array of integers in string form   var arr   new string      1    2    3    4       I need to an array of  real  integers to push it further   void Foo int   arr           I tried to cast int and it of course failed   Foo arr Cast lt int gt  ToArray       I can do next   var list   new List lt int gt  arr Length   arr ForEach i   gt  list Add Int32 Parse i        maybe Convert ToInt32   is better  Foo list ToArray       or  var list   new List lt int gt  arr Length   arr ForEach i   gt       int j     if  Int32 TryParse i  out j      TryParse is faster  yeah            list Add j            Foo list ToArray       but both looks ugly   Is there any other ways to complete the task

User · Answer

you can simply cast a string array to int array  by   var converted   arr Select int Parse

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var list   arr Select i   gt  Int32 Parse i

User · Answer

var asIntegers   arr Select s   gt  int Parse s   ToArray       Have to make sure you are not getting an IEnumerable lt int gt  as a return

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EDIT  to convert to array  int   asIntegers   arr Select s   gt  int Parse s   ToArray      This should do the trick       var asIntegers   arr Select s   gt  int Parse s

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To avoid exceptions with  Parse  here are some  TryParse alternatives   To use only the elements that can be parsed   string   arr     null         1      002     3 0     int i   0   var a    from s in arr where int TryParse s  out i  select i  ToArray        a     1  2     or  var a   arr SelectMany s   gt  int TryParse s  out i    new     i     new int 0   ToArray        Alternatives using 0 for the elements that can t be parsed   int i   var a   Array ConvertAll arr  s   gt  int TryParse s  out i    i   0     a     0  0  1  2  0     or  var a   arr Select  s  i    gt  int TryParse s  out i    i   0  ToArray      C  7 0   var a   Array ConvertAll arr  s   gt  int TryParse s  out var i    i   0

User · Answer

Given an array you can use the Array ConvertAll method   int   myInts   Array ConvertAll arr  s   gt  int Parse s      Thanks to Marc Gravell for pointing out that the lambda can be omitted  yielding a shorter version shown below   int   myInts   Array ConvertAll arr  int Parse     A LINQ solution is similar  except you would need the extra ToArray call to get an array   int   myInts   arr Select int Parse  ToArray

[c#] Convert string[] to int[] in one line of code using LINQ

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