Adding elements to a C array

Question

I would like to programmatically add or remove some elements to a string array in C   but still keeping the items I had before  a bit like the VB function ReDim Preserve

User · Answer

What s abaut this one   List lt int gt  tmpList   intArry ToList    tmpList Add anyInt   intArry   tmpList ToArray

User · Answer

You can use a generic collection   like List lt    List lt string gt  list   new List lt string gt         add list Add  element        remove list Remove  element

User · Answer

Since arrays implement IEnumerable lt T gt  you can use Concat   string   strArr      foo    bar     strArr   strArr Concat new string      something    new        Or what would be more appropriate would be to use a collection type that supports inline manipulation

User · Answer

Don t use an array - use a generic List lt T gt  which allows you to add items dynamically   If this is not an option  you can use Array Copy or Array CopyTo to copy the array into a larger array

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You should take a look at the List object  Lists tend to be better at changing dynamically like you want  Arrays not so much

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One liner      string   items   new string      quot a quot    quot b quot             this adds  quot c quot  to the string array      items   new List lt string gt  items     quot c quot    ToArray

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Use List lt string gt  instead of string     List allows you to add and remove items with good performance

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The obvious suggestion would be to use a List lt string gt  instead  which you will have already read from the other answers  This is definitely the best way in a real development scenario   Of course  I want to make things more interesting  my day that is   so I will answer your question directly   Here are a couple of functions that will Add and Remove elements from a string       string   Add string   array  string newValue       int newLength   array Length   1       string   result   new string newLength        for int i   0  i  lt  array Length  i            result i    array i        result newLength -1    newValue       return result     string   RemoveAt string   array  int index       int newLength   array Length - 1       if newLength  lt  1                return array   probably want to do some better logic for removing the last element              this would also be a good time to check for  index out of bounds  and throw an exception or handle some other way      string   result   new string newLength       int newCounter   0      for int i   0  i  lt  array Length  i                  if i    index   it is assumed at this point i will match index once only                       continue                    result newCounter    array i           newCounter                 return result

User · Answer

You can  use this snippet   static void Main string   args               Console WriteLine  Enter number             int fnum   0          bool chek   Int32 TryParse Console ReadLine   out fnum                         Console WriteLine  Enter number             int snum   0          chek   Int32 TryParse Console ReadLine   out snum             Console WriteLine  Enter number             int thnum   0          chek   Int32 TryParse Console ReadLine   out thnum             int   arr   AddToArr fnum snum thnum            IOrderedEnumerable lt int gt  oarr   arr OrderBy delegate int s                          return s                        Console WriteLine  Here your result               oarr ToList   FindAll delegate int num                 Console WriteLine num                return num  gt  0                       public static int   AddToArr params int   arr         return arr      I hope this will help to you  just change the type

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If you really won t  or can t  use a generic collection instead of your array  Array Resize is c  s version of redim preserve   var  oldA   new     1 2 3 4   Array Resize ref oldA 10   foreach var i in oldA  Console WriteLine i     1 2 3 4 0 0 0 0 0 0

[c#] Adding elements to a C# array

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