Dynamically Add C Properties at Runtime

Question

I know there are some questions that address this  but the answers usually follow along the lines of recommending a Dictionary or Collection of parameters  which doesn t work in my situation   I am using a library that works through reflection to do lots of clever things with objects with properties   This works with defined classes  as well as dynamic classes   I need to take this one step further and do something along these lines   public static object GetDynamicObject Dictionary lt string object gt  properties        var myObject   new object        foreach  var property in properties              This next line obviously doesn t work             myObject AddProperty property Key property Value             return myObject     public void Main         var properties   new Dictionary lt string object gt         properties Add  Property1  aCustomClassInstance       properties Add  Property2   TestString2         var myObject   GetDynamicObject properties          Then use them like this  or rather the plug in uses them through reflection      var customClass   myObject Property1      var myString   myObject Property2       The library works fine with a dynamic variable type  with properties assigned manually   However I don t know how many or what properties will be added beforehand

User · Answer

you could deserialize your json string into a dictionary and then add new properties then serialize it     var jsonString                   var jsonDoc   JsonSerializer Deserialize lt Dictionary lt string  object gt  gt  jsonString            jsonDoc Add  Name    Khurshid Ali             Console WriteLine JsonSerializer Serialize jsonDoc

User · Answer

Have you taken a look at ExpandoObject   see  http   blogs msdn com b csharpfaq archive 2009 10 01 dynamic-in-c-4-0-introducing-the-expandoobject aspx  From MSDN      The ExpandoObject class enables you to add and delete members of its instances at run time and also to set and get values of these members  This class supports dynamic binding  which enables you to use standard syntax like sampleObject sampleMember instead of more complex syntax like sampleObject GetAttribute  sampleMember      Allowing you to do cool things like   dynamic dynObject   new ExpandoObject    dynObject SomeDynamicProperty    Hello    dynObject SomeDynamicAction    msg    gt                Console WriteLine msg           dynObject SomeDynamicAction dynObject SomeDynamicProperty       Based on your actual code you may be more interested in   public static dynamic GetDynamicObject Dictionary lt string  object gt  properties        return new MyDynObject properties      public sealed class MyDynObject   DynamicObject       private readonly Dictionary lt string  object gt   properties       public MyDynObject Dictionary lt string  object gt  properties                 properties   properties             public override IEnumerable lt string gt  GetDynamicMemberNames                 return  properties Keys             public override bool TryGetMember GetMemberBinder binder  out object result                if   properties ContainsKey binder Name                         result    properties binder Name               return true                    else                       result   null              return false                       public override bool TrySetMember SetMemberBinder binder  object value                if   properties ContainsKey binder Name                          properties binder Name    value              return true                    else                       return false                      That way you just need    var dyn   GetDynamicObject new Dictionary lt string  object gt                    prop1   12            Console WriteLine dyn prop1   dyn prop1   150    Deriving from DynamicObject allows you to come up with your own strategy for handling these dynamic member requests  beware there be monsters here  the compiler will not be able to verify a lot of your dynamic calls and you won t get intellisense  so just keep that in mind

User · Answer

Thanks  Clint for the great answer   Just wanted to highlight how easy it was to solve this using the Expando Object       var dynamicObject   new ExpandoObject   as IDictionary lt string  Object gt       foreach  var property in properties            dynamicObject Add property Key property Value

[c#] Dynamically Add C# Properties at Runtime

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