How to create own dynamic type or dynamic object in C

Question

There  is for example  ViewBag property of ControllerBase class and we can dynamically get set values and add any number of additional fields or properties to this object  which is cool  I want to use something like that  beyond MVC application and Controller class in other types of applications  When I tried to create dynamic object and set it s property like below   1  dynamic MyDynamic   new   A  a     2  MyDynamic A    asd   3  Console WriteLine MyDynamic A     I ve got RuntimeBinderException with message Property or indexer   lt  f  AnonymousType0 A  cannot be assigned to -- it is read only in line 2  Also I suggest It s not quite what I m looking-for  Maybe is there some class which can allow me to do something like       MyDynamic   new        MyDynamic A    A   MyDynamic B    B   MyDynamic C   DateTime Now  MyDynamic TheAnswerToLifeTheUniverseAndEverything   42    with dynamic adding and setting properties

User · Answer

You can use ExpandoObject Class which is in System Dynamic namespace   dynamic MyDynamic   new ExpandoObject    MyDynamic A    A   MyDynamic B    B   MyDynamic C    C   MyDynamic SomeProperty   SomeValue MyDynamic number   10  MyDynamic Increment    Action       gt    MyDynamic number          More Info can be found at ExpandoObject MSDN

User · Answer

ExpandoObject is what are you looking for   dynamic MyDynamic   new ExpandoObject       note  the type MUST be dynamic to use dynamic invoking  MyDynamic A    A   MyDynamic B    B   MyDynamic C    C   MyDynamic TheAnswerToLifeTheUniverseAndEverything   42

User · Answer

var data   new   studentId   1  StudentName    abc         Or value is present    var data   new   studentId  StudentName

User · Answer

dynamic MyDynamic   new ExpandoObject

User · Answer

I recently had a need to take this one step further  which was to make the property additions in the dynamic object  dynamic themselves  based on user defined entries  The examples here  and from Microsoft s ExpandoObject documentation  do not specifically address adding properties dynamically  but  can be surmised from how you enumerate and delete properties  Anyhow  I thought this might be helpful to someone  Here is an extremely simplified version of how to add truly dynamic properties to an ExpandoObject  ignoring keyword and other handling               my pretend dataset         List lt string gt  fields   new List lt string gt                my  columns          fields Add  this thing            fields Add  that thing            fields Add  the other             dynamic exo   new System Dynamic ExpandoObject             foreach  string field in fields                          IDictionary lt String  Object gt  exo  Add field  field     data                          output - from Json Net NuGet package         textBox1 Text   Newtonsoft Json JsonConvert SerializeObject exo

User · Answer

dynamic MyDynamic   new System Dynamic ExpandoObject    MyDynamic A    A   MyDynamic B    B   MyDynamic C    C   MyDynamic Number   12  MyDynamic MyMethod   new Func lt int gt       gt          return 55       Console WriteLine MyDynamic MyMethod       Read more about ExpandoObject class and for more samples  Represents an object whose members can be dynamically added and removed at run time

User · Answer

dynamic myDynamic   new   PropertyOne   true  PropertyTwo   false

[c#] How to create own dynamic type or dynamic object in C#?

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