Using Dapper to populate Enum properties

Sure – as long as your enum agrees, i.e.

enum MyEnumType : byte {
    Foo, Bar, Blip, ...
}

then it will all work automatically.

(this limitation is by design, and shared with LINQ-to-SQL as it happens)

Alternatively, if the enum is : int and can’t be changed, cast it in the SQL:

SELECT ..., CAST(x.myEnum as int) as myEnum, ...

Or finally, use the dynamic API:

foreach(var row in conn.Query(...)) { // note no <T>
    T obj = new Item { /* copy from row */ };
    ...
}

The first is my preferred object, as that enforces the byte data-type limitation throughout all your code, which is IMO a good thing.