Question

set value of a property of an anonymous type using reflection / TypeDescriptor is it possible?

According to @Slaks ,

C# anonymous types are immutable, and their properties cannot be
changed.

example :

dynamic p  = new {aaa="1", bbb="2"};

my question is , What is immutable ? ( structure , values , whole world ?)

the structure of

{ 
          something (in type of string) 
          ,
         something (in type of string ) 
    } 

(meaning – the structure is immutable – and i cant change its structure)

or

 { 
          something called aaa (in type of string) 
          ,
         something called bbb (in type of string ) 
    } 

or

the whole world :

  { 
      something (in type of string + value of 1) 
      ,
     something (in type of string + value of 2) 
} 

?

Answer 1

Immutable means it cannot change.

The structure or the values, in this case.

The type of p will always be two string properties – one called aaa with the value "1" and the other one called bbb with the value "2".

You cannot add members to this anonymous type, nor can you change the values of the properties.