How to add a new value to an anonymous type

Question

is it possible to add a value to existing json object?

My example code:

var obj = new { Vall = "myVal1", Val2 = "myVal2", Val3 = "myVal3" };

this is what I'm trying to do:

obj.AddValue(Val4, "myVal4");

Answer 1

var obj = new { Vall = "myVal1", Val2 = "myVal2", Val3 = "myVal3" };

is not JSON, despite the similarity. That is a compiler-generated "anonymous type", which means the compiler creates a type for you with three string properties named Val1, Val and Val3. Other than the fact that you can't speak the name of the type (it is anonymous), it is a pretty normal .NET class. No, you can't add extra properties to a class at runtime.

The closest thing to what you want might be ExpandoObject, but to be honest it sounds like you're trying to do something peculiar.