Delete last char of string

Question

I am retrieving a lot of information in a list  linked to a database and I want to create a string of groups  for someone who is connected to the website   I use this to test but this is not dynamic  so it is really bad   string strgroupids    6     I want to use this now  But the string returned is something like 1 2 3 4 5   groupIds ForEach  g    gt        strgroupids   strgroupids    g ToString              strgroupids TrimEnd            strgroupids TrimEnd new char               I want to delete the   after the 5 but it s definitely not working

User · Answer

Strings in c  are immutable  When in your code you do strgroupids TrimEnd       or strgroupids TrimEnd new char             the strgroupids string is not modified   You need to do something like strgroupids   strgroupids TrimEnd       instead   To quote from here      Strings are immutable--the contents of a string object cannot be   changed after the object is created  although the syntax makes it   appear as if you can do this  For example  when you write this code    the compiler actually creates a new string object to hold the new   sequence of characters  and that new object is assigned to b  The   string  h  is then eligible for garbage collection

User · Answer

strgroupids   strgroupids Remove strgroupids Length - 1     MSDN      String Remove Int32        Deletes all the characters from this string beginning at a specified   position and continuing through the last position

User · Answer

What about doing it this way  strgroupids   string Join       groupIds      A lot cleaner   It will append all elements inside groupIds with a     between each  but it will not put a     at the end

User · Answer

Add an extension method   public static string RemoveLast this string text  string character        if text Length  lt  1  return text      return text Remove text ToString   LastIndexOf character   character Length       then use   yourString RemoveLast

User · Answer

As an alternate to adding a comma for each item you could just using String Join   var strgroupids   String Join       groupIds     This will add the seperator      in this instance  between each element in the array

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In C  8 ranges and indices were introduced  giving us a new more succinct solution  strgroupids   strgroupids    1

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string Join is better  but if you really want a LINQ ForEach   var strgroupids   string Empty   groupIds ForEach g   gt        if strgroupids    string Empty           strgroupids                    strgroupids    g        Some notes    string Join and foreach are both better than this  vastly slower  approach No need to remove the last   since it s never appended The increment operator      is handy for appending to strings  ToString   is unnecessary as it is called automatically when concatenating non-strings When handling large strings  StringBuilder should be considered instead of concatenating strings

User · Answer

Removes any trailing commas   while  strgroupids EndsWith           strgroupids   strgroupids Substring 0  strgroupids Length - 1     This is backwards though  you wrote the code that adds the comma in the first place   You should use string Join     g  instead  assuming g is a string     Give it a better name than g too

User · Answer

There is no  quot quick-and-dirty quot  way of doing this  I usually do  mystring  string Concat mystring Take mystring Length-1

User · Answer

Additional to sll s solution  It s better to trim the string in case there are some blank s  at the end    strgroupids   strgroupids Remove strgroupids Trim   Length - 1

User · Answer

string strgroupids   string Empty   groupIds ForEach g   gt        strgroupids   strgroupids   g ToString               strgroupids   strgroupids Substring 0  strgroupids Length - 1     Note that the use of ForEach here is normally considered  wrong   read for example http   blogs msdn com b ericlippert archive 2009 05 18 foreach-vs-foreach aspx   Using some LINQ   string strgroupids   groupIds Aggregate string Empty   p  q    gt  p   q         strgroupids   strgroupids Substring 0  str1 Length - 1     Without end-substringing   string strgroupids   groupIds Aggregate string Empty   p  q    gt   p    string Empty   p         q   q ToString

[c#] Delete last char of string

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