get dictionary value by key

Question

How can I get the dictionary value by key on function  my function code is this   and the command what I try but didn t work     static void XML Array Dictionary lt string  string gt  Data Array        String xmlfile   Data Array TryGetValue  XML File   out value       my button code is this  private void button2 Click object sender  EventArgs e        Dictionary lt string  string gt  Data Array   new Dictionary lt string  string gt         Data Array Add  XML File    Settings xml         XML Array Data Array       I want something like this  on XML Array function to be string xmlfile   Settings xml

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static void XML Array Dictionary lt string  string gt  Data Array        String value      if Data Array TryGetValue  XML File   out value                  Do something here with value

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Dictionary lt String String gt  d   new Dictionary lt String String gt             d Add  1   Mahadev            d Add  2   Mahesh            Console WriteLine d  1       it will print Value of key  1

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if  Data Array  XML File          String xmlfile   Data Array  XML File

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Why not just use key name on dictionary  C  has this    Dictionary lt string  string gt  dict   new Dictionary lt string  string gt      dict Add  UserID    test     string userIDFromDictionaryByKey   dict  UserID      If you look at the tip suggestion

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That is not how the TryGetValue works  It returns true or false based on whether the key is found or not  and sets its out parameter to the corresponding value if the key is there   If you want to check if the key is there or not and do something when it s missing  you need something like this   bool hasValue   Data Array TryGetValue  XML File   out value   if  hasValue        xmlfile   value    else          do something when the value is not there

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static String findFirstKeyByValue Dictionary lt string  string gt  Data Array  String value        if  Data Array ContainsValue value                 foreach  String key in Data Array Keys                        if  Data Array key  Equals value                   return key                      return null

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It s as simple as this   String xmlfile   Data Array  XML File      Note that if the dictionary doesn t have a key that equals  XML File   that code will throw an exception  If you want to check first  you can use TryGetValue like this   string xmlfile  if   Data Array TryGetValue  XML File   out xmlfile           the key isn t in the dictionary     return     or whatever you want to do      xmlfile is now equal to the value

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private void button2 Click object sender  EventArgs e                                Dictionary lt string  string gt  Data Array   new Dictionary lt string  string gt                     Data Array Add  XML File    Settings xml                     XML Array Data Array                           static void XML Array Dictionary lt string  string gt  Data Array                                String xmlfile   Data Array  XML File

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I use a similar method to dasblinkenlight s in a function to return a single key value from a Cookie containing a JSON array loaded into a Dictionary as follows            lt summary gt          Gets a single key Value from a Json filled cookie with  cookiename   key            lt  summary gt      public static string GetSpecialCookieKeyVal string  CookieName  string  key                  CALL COOKIE VALUES INTO DICTIONARY         Dictionary lt string  string gt  dictCookie           JsonConvert DeserializeObject lt Dictionary lt string  string gt  gt            MyCookinator Get  CookieName             string value          if  dictCookie TryGetValue   key  out value                         return value                    else                       return  0                      Where  MyCookinator Get    is another simple Cookie function getting an http cookie overall value

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Here is an example which I use in my source code  I am getting key and value from Dictionary from element 0 to number of elements in my Dictionary  Then I fill my string   array which I send as a parameter after in my function which accept only params string   Dictionary lt string  decimal gt  listKomPop   addElements    int xpopCount   listKomPop Count  if  xpopCount  gt  0        string   xpostoci   new string xpopCount       for  int i   0  i  lt  xpopCount  i                     here you have key and value element            string key   listKomPop Keys ElementAt i           decimal value   listKomPop key            xpostoci i    value ToString               This solution works with SortedDictionary also

[c#] get dictionary value by key

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