Easiest way to split a string on newlines in NET

Question

I need to split a string into newlines in  NET and the only way I know of to split strings is with the Split method  However that will not allow me to  easily  split on a newline  so what is the best way to do it

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For a string variable s  s Split new string   Environment NewLine  StringSplitOptions None   This uses your environment s definition of line endings  On Windows  line endings are CR-LF  carriage return  line feed  or in C  s escape characters  r n  This is a reliable solution  because if you recombine the lines with String Join  this equals your original string  var lines   s Split new string   Environment NewLine  StringSplitOptions None   var reconstituted   String Join Environment NewLine lines   Debug Assert s  reconstituted     What not to do   Use StringSplitOptions RemoveEmptyEntries  because this will break markup such as Markdown where empty lines have syntactic purpose  Split on separator new char   Environment NewLine   because on Windows this will create one empty string element for each new line

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string   lines   text Split    Environment NewLine ToCharArray       StringSplitOptions RemoveEmptyStrings     The RemoveEmptyStrings option will make sure you don t have empty entries due to  n following a  r   Edit to reflect comments   Note that it will also discard genuine empty lines in the text  This is usually what I want but it might not be your requirement

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I did not know about Environment Newline  but I guess this is a very good solution   My try would have been           string str    Test Me r nTest Me nTest Me           var splitted   str Split   n   Select s   gt  s Trim    ToArray      The additional  Trim removes any  r or  n that might be still present  e  g  when on windows but splitting a string with os x newline characters   Probably not the fastest method though   EDIT   As the comments correctly pointed out  this also removes any whitespace at the start of the line or before the new line feed  If you need to preserve that whitespace  use one of the other options

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I just thought I would add my two-bits  because the other solutions on this question do not fall into the reusable code classification and are not convenient   The following block of code extends the string object so that it is available as a natural method when working with strings   using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Collections  using System Collections ObjectModel   namespace System       public static class StringExtensions               public static string   Split this string s  string delimiter  StringSplitOptions options   StringSplitOptions None                        return s Split new string     delimiter    options                       You can now use the  Split   function from any string as follows   string   result      Pass a string  and the delimiter result   string Split  My simple string             Split an existing string by delimiter only string foo    my - string - i - want - split   result   foo Split  -        You can even pass the split options parameter  When omitted it is    set to StringSplitOptions None result   foo Split  -   StringSplitOptions RemoveEmptyEntries     To split on a newline character  simply pass   n  or   r n  as the delimiter parameter   Comment  It would be nice if Microsoft implemented this overload

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using System IO   string textToSplit   if  textToSplit    null        List lt string gt  lines   new List lt string gt         using  StringReader reader   new StringReader textToSplit                 for  string line   reader ReadLine    line    null  line   reader ReadLine                          lines Add line

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Examples here are great and helped me with a current  quot challenge quot  to split RSA-keys to be presented in a more readable way  Based on Steve Coopers solution      string Splitstring string txt  int n   120  string AddBefore    quot  quot   string AddAfterExtra    quot  quot                   Spit each string into a n-line length list of strings         var Lines   Enumerable Range 0  txt Length   n  Select i   gt  txt Substring i   n  n   ToList                       Check if there are any characters left after split  if so add the rest         if txt Length  gt    txt Length   n  n                Lines Add txt Substring  txt Length n  n               Create return text  with extras         string txtReturn    quot  quot           foreach  string Line in Lines              txtReturn    AddBefore   Line   AddAfterExtra    Environment NewLine          return txtReturn         Presenting a RSA-key with 33 chars width and quotes are then simply Console WriteLine Splitstring RSAPubKey  33   quot   quot  quot    quot   quot  quot      Output   Hopefully someone find it usefull

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Silly answer  write to a temporary file so you can use the venerable File ReadLines  var s    Hello r nWorld   var path   Path GetTempFileName    using  var writer   new StreamWriter path         writer Write s     var lines   File ReadLines path

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Try to avoid using string Split for a general solution  because you ll use more memory everywhere you use the function -- the original string  and the split copy  both in memory  Trust me that this can be one hell of a problem when you start to scale -- run a 32-bit batch-processing app processing 100MB documents  and you ll crap out at eight concurrent threads  Not that I ve been there before     Instead  use an iterator like this       public static IEnumerable lt string gt  SplitToLines this string input                if  input    null                        yield break                     using  System IO StringReader reader   new System IO StringReader input                         string line              while   line   reader ReadLine       null                                yield return line                                  This will allow you to do a more memory efficient loop around your data   foreach var line in document SplitToLines              one line at a time        Of course  if you want it all in memory  you can do this   var allTheLines   document SplitToLines ToArray

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What about using a StringReader   using  System IO StringReader reader   new System IO StringReader input         string line   reader ReadLine

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I m currently using this function  based on other answers  in VB NET   Private Shared Function SplitLines text As String  As String       Return text Split  Environment NewLine  vbCrLf  vbLf   StringSplitOptions None  End Function   It tries to split on the platform-local newline first  and then falls back to each possible newline   I ve only needed this inside one class so far  If that changes  I will probably make this Public and move it to a utility class  and maybe even make it an extension method   Here s how to join the lines back up  for good measure   Private Shared Function JoinLines lines As IEnumerable Of String   As String     Return String Join Environment NewLine  lines  End Function

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You should be able to split your string pretty easily  like so   aString Split Environment NewLine ToCharArray

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Well  actually split should do     Constructing string    StringBuilder sb   new StringBuilder    sb AppendLine  first line    sb AppendLine  second line    sb AppendLine  third line    string s   sb ToString    Console WriteLine s      Splitting multiline string into separate lines string   splitted   s Split new string    System Environment NewLine   StringSplitOptions RemoveEmptyEntries       Output  separate lines  for  int i   0  i  lt  splitted Count    i           Console WriteLine   0    1    i  splitted i

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To split on a string you need to use the overload that takes an array of strings   string   lines   theText Split      new     Environment NewLine        StringSplitOptions None      Edit  If you want to handle different types of line breaks in a text  you can use the ability to match more than one string  This will correctly split on either type of line break  and preserve empty lines and spacing in the text   string   lines   theText Split      new       r n     r     n         StringSplitOptions None

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Based on Guffa s answer  in an extension class  use   public static string   Lines this string source        return source Split new string       r n     n     StringSplitOptions None

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Regex is also an option       private string   SplitStringByLineFeed string inpString                string   locResult   Regex Split inpString     r n              return locResult

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Very easy  actually   VB NET   Private Function SplitOnNewLine input as String  As String     Return input Split Environment NewLine  End Function   C    string splitOnNewLine string input        return input split environment newline

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