How do I get the list of keys in a Dictionary

Question

I only want the Keys and not the Values of a Dictionary  I haven t been able to get any code to do this yet  Using another array proved to be too much work as I use remove also  How do I get a List of the Keys in a Dictionary

User · Answer

For a hybrid dictionary  I use this   List lt string gt  keys   new List lt string gt  dictionary Count   keys AddRange dictionary Keys Cast lt string gt

User · Answer

To get list of all keys  using System Linq  List lt String gt  myKeys   myDict Keys ToList      System Linq is supported in  Net framework 3 5 or above  See the below links if you face any issue in using System Linq  Visual Studio Does not recognize System Linq  System Linq Namespace

User · Answer

You should be able to just look at  Keys       Dictionary lt string  int gt  data   new Dictionary lt string  int gt         data Add  abc   123       data Add  def   456       foreach  string key in data Keys                Console WriteLine key

User · Answer

The question is a little tricky to understand but I m guessing that the problem is that you re trying to remove elements from the Dictionary while you iterate over the keys  I think in that case you have no choice but to use a second array   ArrayList lList   new ArrayList lDict Keys   foreach  object lKey in lList      if   lt your condition here gt           lDict Remove lKey           If you can use generic lists and dictionaries instead of an ArrayList then I would  however the above should just work

User · Answer

I often used this to get the key and value inside a dictionary    VB Net    For Each kv As KeyValuePair Of String  Integer  In layerList   Next    layerList is of type Dictionary Of String  Integer

User · Answer

Or like this   List lt  KeyValuePair lt  string  int  gt   gt  theList       new List lt  KeyValuePair lt  string int  gt   gt  this yourDictionary    for   int i   0  i  lt  theList Count  i            the key   Console WriteLine theList i  Key

User · Answer

I can t believe all these convoluted answers  Assuming the key is of type  string  or use  var  if you re a lazy developer   -  List lt string gt  listOfKeys   theCollection Keys ToList

User · Answer

List lt string gt  keyList   new List lt string gt  this yourDictionary Keys

User · Answer

Marc Gravell s answer should work for you  myDictionary Keys returns an object that implements ICollection lt TKey gt   IEnumerable lt TKey gt  and their non-generic counterparts   I just wanted to add that if you plan on accessing the value as well  you could loop through the dictionary like this  modified example    Dictionary lt string  int gt  data   new Dictionary lt string  int gt     data Add  abc   123   data Add  def   456    foreach  KeyValuePair lt string  int gt  item in data        Console WriteLine item Key          item Value

[c#] How do I get the list of keys in a Dictionary?

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