C Syntax - Split String into Array by Comma Convert To Generic List and Reverse Order

Question

What is the correct syntax for this   IList lt string gt  names    Tom Scott Bob  Split      ToList lt string gt    Reverse      What am I messing up  What does TSource mean

User · Answer

If you are trying to

Use multiple delimiters
Filter any empty strings
Trim leading/trailing spaces

following should work:

string str = "Tom Cruise, Scott, ,Bob | at";
IEnumerable<string> names = str
                            .Split(new char[]{',', '|'})
                            .Where(x=>x!=null && x.Trim().Length > 0)
                            .Select(x=>x.Trim());

Output

Tom
Cruise
Scott
Bob
at

Now you can obviously reverse the order as others suggested.

User · Answer

Try this   List lt string gt  names   new List lt string gt   Tom Scott Bob  Split        names Reverse

User · Answer

List lt string gt  names    Tom Scott Bob  Split      Reverse   ToList      This one works

User · Answer

List lt string gt  names    Tom Scott Bob  Split      Reverse   ToList      This one works

User · Answer

What your missing here is that  Reverse   is a void method   It s not possible to assign the result of  Reverse   to a variable   You can however alter the order to use Enumerable Reverse   and get your result  var x    Tom Scott Bob  Split      Reverse   ToList lt string gt      The difference is that Enumerable Reverse   returns an IEnumerable lt T gt  instead of being void return

User · Answer

What your missing here is that  Reverse   is a void method   It s not possible to assign the result of  Reverse   to a variable   You can however alter the order to use Enumerable Reverse   and get your result  var x    Tom Scott Bob  Split      Reverse   ToList lt string gt      The difference is that Enumerable Reverse   returns an IEnumerable lt T gt  instead of being void return

User · Answer

I realize that this question is quite old  but I had a similar problem  except my string had spaces included in it  For those that need to know how to separate a string with more than just commas   string str    Tom  Scott  Bob     IList lt string gt  names   str Split new string                StringSplitOptions RemoveEmptyEntries     The StringSplitOptions removes the records that would only be a space char

User · Answer

What your missing here is that  Reverse   is a void method   It s not possible to assign the result of  Reverse   to a variable   You can however alter the order to use Enumerable Reverse   and get your result  var x    Tom Scott Bob  Split      Reverse   ToList lt string gt      The difference is that Enumerable Reverse   returns an IEnumerable lt T gt  instead of being void return

User · Answer

The problem is that you re calling List lt T gt  Reverse   which returns void   You could either do   List lt string gt  names    Tom Scott Bob  Split      ToList lt string gt     names Reverse      or   IList lt string gt  names    Tom Scott Bob  Split      Reverse   ToList lt string gt       The latter is more expensive  as reversing an arbitrary IEnumerable lt T gt  involves buffering all of the data and then yielding it all - whereas List lt T gt  can do all the reversing  in-place    The difference here is that it s calling the Enumerable Reverse lt T gt    extension method  instead of the List lt T gt  Reverse   instance method    More efficient yet  you could use   string   namesArray    Tom Scott Bob  Split       List lt string gt  namesList   new List lt string gt  namesArray Length   namesList AddRange namesArray   namesList Reverse      This avoids creating any buffers of an inappropriate size - at the cost of taking four statements where one will do    As ever  weigh up readability against performance in the real use case

User · Answer

Try this   List lt string gt  names   new List lt string gt   Tom Scott Bob  Split        names Reverse

User · Answer

The problem is that you re calling List lt T gt  Reverse   which returns void   You could either do   List lt string gt  names    Tom Scott Bob  Split      ToList lt string gt     names Reverse      or   IList lt string gt  names    Tom Scott Bob  Split      Reverse   ToList lt string gt       The latter is more expensive  as reversing an arbitrary IEnumerable lt T gt  involves buffering all of the data and then yielding it all - whereas List lt T gt  can do all the reversing  in-place    The difference here is that it s calling the Enumerable Reverse lt T gt    extension method  instead of the List lt T gt  Reverse   instance method    More efficient yet  you could use   string   namesArray    Tom Scott Bob  Split       List lt string gt  namesList   new List lt string gt  namesArray Length   namesList AddRange namesArray   namesList Reverse      This avoids creating any buffers of an inappropriate size - at the cost of taking four statements where one will do    As ever  weigh up readability against performance in the real use case

User · Answer

Try this   List lt string gt  names   new List lt string gt   Tom Scott Bob  Split        names Reverse

User · Answer

List lt string gt  names    Tom Scott Bob  Split      Reverse   ToList      This one works

User · Answer

Try this   List lt string gt  names   new List lt string gt   Tom Scott Bob  Split        names Reverse

User · Answer

List lt string gt  names    Tom Scott Bob  Split      Reverse   ToList      This one works

User · Answer

The problem is that you re calling List lt T gt  Reverse   which returns void   You could either do   List lt string gt  names    Tom Scott Bob  Split      ToList lt string gt     names Reverse      or   IList lt string gt  names    Tom Scott Bob  Split      Reverse   ToList lt string gt       The latter is more expensive  as reversing an arbitrary IEnumerable lt T gt  involves buffering all of the data and then yielding it all - whereas List lt T gt  can do all the reversing  in-place    The difference here is that it s calling the Enumerable Reverse lt T gt    extension method  instead of the List lt T gt  Reverse   instance method    More efficient yet  you could use   string   namesArray    Tom Scott Bob  Split       List lt string gt  namesList   new List lt string gt  namesArray Length   namesList AddRange namesArray   namesList Reverse      This avoids creating any buffers of an inappropriate size - at the cost of taking four statements where one will do    As ever  weigh up readability against performance in the real use case

User · Answer

What your missing here is that  Reverse   is a void method   It s not possible to assign the result of  Reverse   to a variable   You can however alter the order to use Enumerable Reverse   and get your result  var x    Tom Scott Bob  Split      Reverse   ToList lt string gt      The difference is that Enumerable Reverse   returns an IEnumerable lt T gt  instead of being void return

User · Answer

If you are trying to

Use multiple delimiters
Filter any empty strings
Trim leading/trailing spaces

following should work:

string str = "Tom Cruise, Scott, ,Bob | at";
IEnumerable<string> names = str
                            .Split(new char[]{',', '|'})
                            .Where(x=>x!=null && x.Trim().Length > 0)
                            .Select(x=>x.Trim());

Output

Tom
Cruise
Scott
Bob
at

Now you can obviously reverse the order as others suggested.

User · Answer

I realize that this question is quite old  but I had a similar problem  except my string had spaces included in it  For those that need to know how to separate a string with more than just commas   string str    Tom  Scott  Bob     IList lt string gt  names   str Split new string                StringSplitOptions RemoveEmptyEntries     The StringSplitOptions removes the records that would only be a space char

User · Answer

The problem is that you re calling List lt T gt  Reverse   which returns void   You could either do   List lt string gt  names    Tom Scott Bob  Split      ToList lt string gt     names Reverse      or   IList lt string gt  names    Tom Scott Bob  Split      Reverse   ToList lt string gt       The latter is more expensive  as reversing an arbitrary IEnumerable lt T gt  involves buffering all of the data and then yielding it all - whereas List lt T gt  can do all the reversing  in-place    The difference here is that it s calling the Enumerable Reverse lt T gt    extension method  instead of the List lt T gt  Reverse   instance method    More efficient yet  you could use   string   namesArray    Tom Scott Bob  Split       List lt string gt  namesList   new List lt string gt  namesArray Length   namesList AddRange namesArray   namesList Reverse      This avoids creating any buffers of an inappropriate size - at the cost of taking four statements where one will do    As ever  weigh up readability against performance in the real use case

[c#] C# Syntax - Split String into Array by Comma, Convert To Generic List, and Reverse Order

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