dynamic Objects with variables in c#

Question

Is it possible to build dynamic objects having the property name set to the value of a variable?

for instance this seems standard...

dynamic elem = new Object();
elem.Name = "myName";

but how would this be implemented?...

string fn = "FirstName";
string ln = "LastName";
dynamic elem = new Object();
elem.fn = "John";
elem.ln = "Doe";

where as i would be able to call the properties like...

string fn = elem.FirstName;

thanks, I tried that earlier but... "Additional information: Cannot apply indexing with [] to an expression of type 'object'". Not dealing with a dictionary here. The dynamic Object could have many properties, not just a key and a value. — Skinner
– Skinner, Commented Jul 27, 2017 at 22:20
for instance this seems standard... No It can not work, object doesn't have a property Name..... Post compilable/correct code — L.B
– L.B, Commented Jul 27, 2017 at 22:23
There is not a mechanism in C# to macro-replace member names. Seems like an indexer is the most appropriate solution, which means you can use a simple Dictionary<string,object>. If that does not meet your needs then please add to your question, but the syntax you propose is not possible in C#. — D Stanley
– D Stanley, Commented Jul 27, 2017 at 22:32

Alex KeySmith · Accepted Answer · 2017-07-27 22:28:27Z

6

The ExpandoObject also implements IDictionary<string, object>, meaning you can add properties using a string key.

dynamic person = new ExpandoObject();

person.FirstName = "Alex";
var ln = "lastname";

(person as IDictionary<string, Object>)[ln] = "KeySmith";

answered Jul 27, 2017 at 22:28

Alex KeySmith

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1 Comment

Alex KeySmith Over a year ago

I've noticed a -1, any feedback would be a appreciated. Of course making use of dynamic / expandobject should be carefully considered, however I believe this is answering the question at hand.

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