How to create a List with a dynamic object type

Question

How can I create a new List lt T gt  where the T is a  dynamic Type object   I have  dynamic DyObj   new ExpandoObject     if  condition1      DyObj Required   true    DyObj Message    This is the first property being accessed through dynamic object     if  condition2        DyObj Required   false      DyObj Message    This is the second property            and so on      I want to create List lt Dyobj gt  and assign all the messages to Dyobj based on conditions    Follow up data from comments     var DyObjectsList   new List lt dynamic gt    dynamic DyObj   new ExpandoObject     if  condition1         DyObj Required   true       DyObj Message    Message 1        DyObjectsList Add DyObj       if  condition2         DyObj Required   false       DyObj Message    Message 2        DyObjectsList Add DyObj         interestingly all the objects in DyObjectsList are replaced with the values of the last assigned object

User · Accepted Answer

Just use dynamic as the argument   var list   new List lt dynamic gt

User · Answer

It appears you might be a bit confused as to how the  Add method works   I will refer directly to your code in my explanation   Basically in C   the  Add method of a List of objects does not COPY new added objects into the list  it merely copies a reference to the object  it s address  into the List   So the reason every value in the list is pointing to the same value is because you ve only created 1 new DyObj   So your list essentially looks like this   DyObjectsList 0     amp DyObj     pointing to DyObj DyObjectsList 1     amp DyObj     pointing to the same DyObj DyObjectsList 2     amp DyObj     pointing to the same DyObj        The easiest way to fix your code is to create a new DyObj for every  Add   Putting the new inside of the block with the  Add would accomplish this goal in this particular instance    var DyObjectsList   new List lt dynamic gt    if  condition1         dynamic DyObj   new ExpandoObject         DyObj Required   true       DyObj Message    Message 1        DyObjectsList  Add DyObj       if  condition2         dynamic DyObj   new ExpandoObject         DyObj Required   false       DyObj Message    Message 2        DyObjectsList  Add DyObj         your resulting List essentially looks like this  DyObjectsList 0     amp DyObj0     pointing to a DyObj DyObjectsList 1     amp DyObj1     pointing to a different DyObj DyObjectsList 2     amp DyObj2     pointing to another DyObj   Now in some other languages this approach wouldn t work  because as you leave the block  the objects declared in the scope of the block could go out of scope and be destroyed   Thus you would be left with a collection of pointers  pointing to garbage   However in C   if a reference to the new DyObjs exists when you leave the block  and they do exist in your List because of the  Add operation  then C  does not release the memory associated with that pointer  Therefore the Objects you created in that block persist and your List contains pointers to valid objects and your code works

[c#] How to create a List with a dynamic object type

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