How do I create a comma delimited string from an ArrayList

Question

I m storing an ArrayList of Ids in a processing script that I want to spit out as a comma delimited list for output to the debug log  Is there a way I can get this easily without looping through things   EDIT  Thanks to Joel for pointing out the List Of T  that is available in  net 2 0 and above  That makes things TONS easier if you have it available

User · Answer

string Join       myArrayList ToArray      This will work with  net framework 4 5

User · Answer

Something like   String Join      myArrayList toArray string GetType         Which basically loops ya know     EDIT  how about   string Join      Array ConvertAll lt object  string gt  a ToArray    Convert ToString

User · Answer

Something like   String Join      myArrayList toArray string GetType         Which basically loops ya know     EDIT  how about   string Join      Array ConvertAll lt object  string gt  a ToArray    Convert ToString

User · Answer

Something like   String Join      myArrayList toArray string GetType         Which basically loops ya know     EDIT  how about   string Join      Array ConvertAll lt object  string gt  a ToArray    Convert ToString

User · Answer

The solutions so far are all quite complicated  The idiomatic solution should doubtless be   String Join      x Cast Of String    ToArray      There s no need for fancy acrobatics in new framework versions  Supposing a not-so-modern version  the following would be easiest   Console WriteLine String Join      CType x ToArray GetType String    String        mspmsp s second solution is a nice approach as well but it s not working because it misses the AddressOf keyword  Also  Convert ToString is rather inefficient  lots of unnecessary internal evaluations  and the Convert class is generally not very cleanly designed  I tend to avoid it  especially since it s completely redundant

User · Answer

string Join       myArrayList ToArray      This will work with  net framework 4 5

User · Answer

Here s a simple example demonstrating the creation of a comma delimited string using String Join   from a list of Strings   List lt string gt  histList   new List lt string gt     histList Add dt ToString  MM dd yyyy  HH mm ss ffff     histList Add Index ToString       arValue is array of Singles    foreach  Single s in arValue         histList Add s ToString       String HistLine   String Join      histList ToArray

User · Answer

Yes  I m answering my own question  but I haven t found it here yet and thought this was a rather slick thing      in VB NET   String Join      CType TargetArrayList ToArray Type GetType  System String     String          in C   string Join       string   TargetArrayList ToArray Type GetType  System String       The only  gotcha  to these is that the ArrayList must have the items stored as Strings if you re using Option Strict to make sure the conversion takes place properly   EDIT  If you re using  net 2 0 or above  simply create a List Of String  type object and you can get what you need with  Many thanks to Joel for bringing this up   String Join      TargetList ToArray

User · Answer

foo ToArray   Aggregate  a  b    gt   a         b   ToString     or   string Concat foo ToArray   Select a   gt  a         ToArray      Updating  as this is extremely old   You should  of course  use string Join now  It didn t exist as an option at the time of writing

User · Answer

Yes  I m answering my own question  but I haven t found it here yet and thought this was a rather slick thing      in VB NET   String Join      CType TargetArrayList ToArray Type GetType  System String     String          in C   string Join       string   TargetArrayList ToArray Type GetType  System String       The only  gotcha  to these is that the ArrayList must have the items stored as Strings if you re using Option Strict to make sure the conversion takes place properly   EDIT  If you re using  net 2 0 or above  simply create a List Of String  type object and you can get what you need with  Many thanks to Joel for bringing this up   String Join      TargetList ToArray

User · Answer

The solutions so far are all quite complicated  The idiomatic solution should doubtless be   String Join      x Cast Of String    ToArray      There s no need for fancy acrobatics in new framework versions  Supposing a not-so-modern version  the following would be easiest   Console WriteLine String Join      CType x ToArray GetType String    String        mspmsp s second solution is a nice approach as well but it s not working because it misses the AddressOf keyword  Also  Convert ToString is rather inefficient  lots of unnecessary internal evaluations  and the Convert class is generally not very cleanly designed  I tend to avoid it  especially since it s completely redundant

User · Answer

Something like   String Join      myArrayList toArray string GetType         Which basically loops ya know     EDIT  how about   string Join      Array ConvertAll lt object  string gt  a ToArray    Convert ToString

User · Answer

foo ToArray   Aggregate  a  b    gt   a         b   ToString     or   string Concat foo ToArray   Select a   gt  a         ToArray      Updating  as this is extremely old   You should  of course  use string Join now  It didn t exist as an option at the time of writing

User · Answer

The solutions so far are all quite complicated  The idiomatic solution should doubtless be   String Join      x Cast Of String    ToArray      There s no need for fancy acrobatics in new framework versions  Supposing a not-so-modern version  the following would be easiest   Console WriteLine String Join      CType x ToArray GetType String    String        mspmsp s second solution is a nice approach as well but it s not working because it misses the AddressOf keyword  Also  Convert ToString is rather inefficient  lots of unnecessary internal evaluations  and the Convert class is generally not very cleanly designed  I tend to avoid it  especially since it s completely redundant

User · Answer

The solutions so far are all quite complicated  The idiomatic solution should doubtless be   String Join      x Cast Of String    ToArray      There s no need for fancy acrobatics in new framework versions  Supposing a not-so-modern version  the following would be easiest   Console WriteLine String Join      CType x ToArray GetType String    String        mspmsp s second solution is a nice approach as well but it s not working because it misses the AddressOf keyword  Also  Convert ToString is rather inefficient  lots of unnecessary internal evaluations  and the Convert class is generally not very cleanly designed  I tend to avoid it  especially since it s completely redundant

User · Answer

So far I found this is a good and quick solution   CPID   is the array string cps    quot  quot   if  CPID Length  gt  0           foreach  var item in CPID                cps    item Trim      quot   quot             Use the string cps

User · Answer

foo ToArray   Aggregate  a  b    gt   a         b   ToString     or   string Concat foo ToArray   Select a   gt  a         ToArray      Updating  as this is extremely old   You should  of course  use string Join now  It didn t exist as an option at the time of writing

User · Answer

Yes  I m answering my own question  but I haven t found it here yet and thought this was a rather slick thing      in VB NET   String Join      CType TargetArrayList ToArray Type GetType  System String     String          in C   string Join       string   TargetArrayList ToArray Type GetType  System String       The only  gotcha  to these is that the ArrayList must have the items stored as Strings if you re using Option Strict to make sure the conversion takes place properly   EDIT  If you re using  net 2 0 or above  simply create a List Of String  type object and you can get what you need with  Many thanks to Joel for bringing this up   String Join      TargetList ToArray

User · Answer

Yes  I m answering my own question  but I haven t found it here yet and thought this was a rather slick thing      in VB NET   String Join      CType TargetArrayList ToArray Type GetType  System String     String          in C   string Join       string   TargetArrayList ToArray Type GetType  System String       The only  gotcha  to these is that the ArrayList must have the items stored as Strings if you re using Option Strict to make sure the conversion takes place properly   EDIT  If you re using  net 2 0 or above  simply create a List Of String  type object and you can get what you need with  Many thanks to Joel for bringing this up   String Join      TargetList ToArray

User · Answer

foo ToArray   Aggregate  a  b    gt   a         b   ToString     or   string Concat foo ToArray   Select a   gt  a         ToArray      Updating  as this is extremely old   You should  of course  use string Join now  It didn t exist as an option at the time of writing

User · Answer

Here s a simple example demonstrating the creation of a comma delimited string using String Join   from a list of Strings   List lt string gt  histList   new List lt string gt     histList Add dt ToString  MM dd yyyy  HH mm ss ffff     histList Add Index ToString       arValue is array of Singles    foreach  Single s in arValue         histList Add s ToString       String HistLine   String Join      histList ToArray

User · Answer

So far I found this is a good and quick solution   CPID   is the array string cps    quot  quot   if  CPID Length  gt  0           foreach  var item in CPID                cps    item Trim      quot   quot             Use the string cps

[c#] How do I create a comma delimited string from an ArrayList?

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