How to convert object to Dictionary TKey TValue in C

Question

How do I convert a dynamic object to a Dictionary lt TKey  TValue gt  in C  What can I do   public static void MyMethod object obj        if  typeof IDictionary  IsAssignableFrom obj GetType                      My object is a dictionary  casting the object              Dictionary lt string  string gt   obj             causes error               else                  My object is not a dictionary

User · Answer

Simple way   public IDictionary lt T  V gt  toDictionary lt T  V gt  Object objAttached        var dicCurrent   new Dictionary lt T  V gt         foreach  DictionaryEntry dicData in  objAttached as IDictionary                 dicCurrent Add  T dicData Key   V dicData Value             return dicCurrent

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If you mind to use LINQ Expression  public static Dictionary lt string  object gt  ConvertFromObjectToDictionary object arg         return arg GetType   GetProperties   ToDictionary property   gt  property Name  property   gt  property GetValue arg

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public static void MyMethod object obj      Dictionary lt string  string gt  dicEditdata   data as Dictionary lt string  string gt      string abc dicEditdata  id   ToString        suppose--- if you place the cursor over the object obj  while debugging and  if you get an object with the value    id   ID1003    then you can use the value as   string abc dicEditdata  id   ToString

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I use this helper   public static class ObjectToDictionaryHelper       public static IDictionary lt string  object gt  ToDictionary this object source                return source ToDictionary lt object gt                public static IDictionary lt string  T gt  ToDictionary lt T gt  this object source                if  source    null              ThrowExceptionWhenSourceArgumentIsNull             var dictionary   new Dictionary lt string  T gt             foreach  PropertyDescriptor property in TypeDescriptor GetProperties source               AddPropertyToDictionary lt T gt  property  source  dictionary           return dictionary             private static void AddPropertyToDictionary lt T gt  PropertyDescriptor property  object source  Dictionary lt string  T gt  dictionary                object value   property GetValue source           if  IsOfType lt T gt  value               dictionary Add property Name   T value              private static bool IsOfType lt T gt  object value                return value is T             private static void ThrowExceptionWhenSourceArgumentIsNull                 throw new ArgumentNullException  source    Unable to convert object to a dictionary  The source object is null               the usage is just to call  ToDictionary   on an object  Hope it helps

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Assuming key can only be a string but value can be anything try this  public static Dictionary lt TKey  TValue gt  MyMethod lt TKey  TValue gt  object obj        if  obj is Dictionary lt TKey  TValue gt  stringDictionary                return stringDictionary             if  obj is IDictionary baseDictionary                var dictionary   new Dictionary lt TKey  TValue gt             foreach  DictionaryEntry keyValue in baseDictionary                        if    keyValue Value is TValue                                    value is not TKey  perhaps throw an exception                 return null                            if    keyValue Key is TKey                                    value is not TValue  perhaps throw an exception                 return null                             dictionary Add  TKey keyValue Key   TValue keyValue Value                     return dictionary               object is not a dictionary  perhaps throw an exception     return null

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This code securely works to convert Object to Dictionary  having as premise that the source object comes from a Dictionary        private static Dictionary lt TKey  TValue gt  ObjectToDictionary lt TKey  TValue gt  object source                Dictionary lt TKey  TValue gt  result   new Dictionary lt TKey  TValue gt              TKey   keys                TValue   values                 bool outLoopingKeys   false  outLoopingValues   false           foreach  PropertyDescriptor property in TypeDescriptor GetProperties source                         object value   property GetValue source               if  value is Dictionary lt TKey  TValue gt  KeyCollection                                keys     Dictionary lt TKey  TValue gt  KeyCollection value  ToArray                    outLoopingKeys   true                            if  value is Dictionary lt TKey  TValue gt  ValueCollection                                values     Dictionary lt TKey  TValue gt  ValueCollection value  ToArray                    outLoopingValues   true                            if outLoopingKeys  amp  outLoopingValues                                break                                   for  int i   0  i  lt  keys Length  i                          result Add keys i   values i                       return result

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public static KeyValuePair lt object  object  gt  Cast lt K  V gt  this KeyValuePair lt K  V gt  kvp                return new KeyValuePair lt object  object gt  kvp Key  kvp Value              public static KeyValuePair lt T  V gt  CastFrom lt T  V gt  Object obj                return  KeyValuePair lt T  V gt   obj             public static KeyValuePair lt object   object  gt  CastFrom Object obj                var type   obj GetType            if  type IsGenericType                        if  type    typeof  KeyValuePair lt   gt                                  var key   type GetProperty  Key                    var value   type GetProperty  Value                    var keyObj   key GetValue obj  null                   var valueObj   value GetValue obj  null                   return new KeyValuePair lt object  object gt  keyObj  valueObj                                   throw new ArgumentException       - gt  public static KeyValuePair lt object   object  gt  CastFrom Object obj    Error   obj argument must be KeyValuePair lt   gt             From the OP       Instead of converting my whole Dictionary  i decided to keep my obj   dynamic the whole time  When i access the keys and values of my   Dictionary with a foreach later  i use foreach dynamic key in   obj Keys  and convert the keys and values to strings simply

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You can create a generic extension method and then use it on the object like   public static class Extensions       public static KeyValuePair lt TKey  TValue gt  ToKeyValuePair lt TKey  TValue gt  this Object obj                   if obj is null throws exception         Contract Requires obj    null               gets the type of the obj parameter         var type   obj GetType               checks if obj is of type KeyValuePair         if  type IsGenericType  amp  amp  type    typeof KeyValuePair lt TKey  TValue gt                           return new KeyValuePair lt TKey  TValue gt                                                        TKey type GetProperty  Key   GetValue obj  null                                                         TValue type GetProperty  Value   GetValue obj  null                                                                            if obj type does not match KeyValuePair throw exception         throw new ArgumentException   obj argument must be of type KeyValuePair lt  typeof TKey  FullName   typeof TValue  FullName  gt             and usage would be like   KeyValuePair lt string long gt  kvp   obj ToKeyValuePair lt string long gt

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You can use this   Dictionary lt object object gt  mydic     IEnumerable obj  Cast lt object gt    ToList   ToDictionary px   gt  px GetType   GetProperty  Key   GetValue px   pv   gt  pv GetType   GetProperty  Value   GetValue pv

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Another option is to use NewtonSoft JSON  var dictionary   JObject FromObject anObject  ToObject lt Dictionary lt string  object gt  gt

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As I understand it  you re not sure what the keys and values are  but you want to convert them into strings   Maybe this can work   public static void MyMethod object obj      var iDict   obj as IDictionary    if  iDict    null          var dictStrStr   iDict Cast lt DictionaryEntry gt           ToDictionary de   gt  de Key ToString    de   gt  de Value ToString             use your dictStrStr               else            My object is not an IDictionary

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this should work   for numbers  strings  date  etc        public static void MyMethod object obj                if  typeof IDictionary  IsAssignableFrom obj GetType                           IDictionary idict    IDictionary obj               Dictionary lt string  string gt  newDict   new Dictionary lt string  string gt                 foreach  object key in idict Keys                                newDict Add key ToString    idict key  ToString                                     else                          My object is not a dictionary                   if your dictionary also contains some other objects       public static void MyMethod object obj                if  typeof IDictionary  IsAssignableFrom obj GetType                           IDictionary idict    IDictionary obj              Dictionary lt string  string gt  newDict   new Dictionary lt string  string gt                  foreach  object key in idict Keys                                newDict Add objToString key   objToString idict key                                     else                          My object is not a dictionary                      private static string objToString object obj                string str               if  obj GetType   FullName     System String                         str    string obj                    else if  obj GetType   FullName     test Testclass                         TestClass c    TestClass obj              str   c Info                    return str

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The above answers are all cool  I found it easy to json serialize the object and deserialize as a dictionary   var json   JsonConvert SerializeObject obj   var dictionary   JsonConvert DeserializeObject lt Dictionary lt string  string gt  gt  json     I don t know how performance is effected but this is much easier to read  You could also wrap it inside a function   public static Dictionary lt string  TValue gt  ToDictionary lt TValue gt  object obj               var json   JsonConvert SerializeObject obj       var dictionary   JsonConvert DeserializeObject lt Dictionary lt string  TValue gt  gt  json          return dictionary      Use like so   var obj   new   foo   12345  boo   true    var dictionary   ToDictionary lt string gt  obj

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object parsedData   se Deserialize reader   System Collections IEnumerable stksEnum   parsedData as System Collections IEnumerable    then will be able to enumerate it

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I use this simple method   public Dictionary lt string  string gt  objToDict XYZ ObjectCollection objs        var dict   new Dictionary lt string  string gt         foreach  KeyValuePair lt string  string gt  each in objs           dict Add each Key  each Value             return dict

[c#] How to convert object to Dictionary<TKey, TValue> in C#?

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