How to add a string to a string array There s no Add function

Question

private string   ColeccionDeCortes string Path        DirectoryInfo X   new DirectoryInfo Path       FileInfo   listaDeArchivos   X GetFiles        string   Coleccion       foreach  FileInfo FI in listaDeArchivos                  Add the FI Name to the Coleccion   array              return Coleccion      I d like to convert the FI Name to a string and then add it to my array  How can I do this

User · Accepted Answer

You can t add items to an array  since it has fixed length  What you re looking for is a List lt string gt   which can later be turned to an array using list ToArray    e g   List lt string gt  list   new List lt string gt     list Add  Hi    String   str   list ToArray

User · Answer

Use List lt T  from System Collections Generic  List lt string gt  myCollection   new List lt string gt           myCollection Add aString     Or  shorthand  using collection initialiser    List lt string gt  myCollection   new List lt string gt   aString  bString    If you really want an array at the end  use  myCollection ToArray      You might be better off abstracting to an interface  such as IEnumerable  then just returning the collection   Edit  If you must use an array  you can preallocate it to the right size  i e  the number of FileInfo you have   Then  in the foreach loop  maintain a counter for the array index you need to update next   private string   ColeccionDeCortes string Path        DirectoryInfo X   new DirectoryInfo Path       FileInfo   listaDeArchivos   X GetFiles        string   Coleccion   new string listaDeArchivos Length       int i   0       foreach  FileInfo FI in listaDeArchivos                Coleccion i      FI Name            Add the FI Name to the Coleccion   array              return Coleccion

User · Answer

string   coleccion   Directory GetFiles inputPath       Select x   gt  new FileInfo x  Name       ToArray

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string   MyArray   new string      A    B     MyArray   new List lt string gt  MyArray     C    ToArray      MyArray     A    B    C

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to clear the array and make the number of it s elements   0 at the same time  use this    System Array Resize ref arrayName  0

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Alternatively  you can resize the array   Array Resize ref array  array Length   1   array array Length - 1     new string

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Eazy     Create list var myList   new List lt string gt         Add items to the list myList Add  item1    myList Add  item2        Convert to array var myArray   myList ToArray

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This code works great for preparing the dynamic values Array for spinner in Android       List lt String gt  yearStringList   new ArrayList lt  gt         yearStringList add  2017        yearStringList add  2018        yearStringList add  2019          String   yearStringArray    String    yearStringList toArray new String yearStringList size

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This is how I add to a string when needed   string   myList  myList   new string 100   for  int i   0  i  lt  100  i          myList i    string Format  List string    0    i

User · Answer

Why don t you use a for loop instead of using foreach  In this scenario  there is no way you can get the index of the current iteration of the foreach loop   The name of the file can be added to the string   in this way    private string   ColeccionDeCortes string Path      DirectoryInfo X   new DirectoryInfo Path     FileInfo   listaDeArchivos   X GetFiles      string   Coleccion new string listaDeArchivos Length      for  int i   0  i  lt  listaDeArchivos Length  i             Coleccion i    listaDeArchivos i  Name         return Coleccion

User · Answer

I would not use an array in this case  Instead I would use a StringCollection   using System Collections Specialized   private StringCollection ColeccionDeCortes string Path            DirectoryInfo X   new DirectoryInfo Path        FileInfo   listaDeArchivos   X GetFiles        StringCollection Coleccion   new StringCollection         foreach  FileInfo FI in listaDeArchivos                Coleccion Add  FI Name              return Coleccion

User · Answer

I would do it like this  DirectoryInfo X   new DirectoryInfo Path   FileInfo   listaDeArchivos   X GetFiles    string   Coleccion   new String         foreach  FileInfo FI in listaDeArchivos        Coleccion   Coleccion Concat new string     FI Name    ToArray       return Coleccion

User · Answer

If I m not mistaken it is   MyArray SetValue ArrayElement  PositionInArray

User · Answer

Adding a reference to Linq using System Linq  and use the provided extension method Append  public static IEnumerable lt TSource gt  Append lt TSource gt  this IEnumerable lt TSource gt  source  TSource element  Then you need to convert it back to string   using the  ToArray   method   It is possible  because the type string   implements IEnumerable  it also implements the following interfaces  IEnumerable lt char gt   IEnumerable  IComparable  IComparable lt String gt   IConvertible  IEquatable lt String gt   ICloneable  using System Linq  public string   descriptionSet new string     yay    descriptionSet   descriptionSet Append  hooray    ToArray

[c#] How to add a string to a string[] array? There's no .Add function

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