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Simple question – what does this actually do?
var oq = (ObjectQuery<TEntity>)L2EQuery;
return ExecuteFirstorDefault<TEntity>(oq, MergeOption.AppendOnly);
It’s partly from the book Programming Entity Framework, by Julia Lerman.
The cast itself does nothing more than check the type. Since your query is of type ObjectQuery<TEntity>, it succeeds. I presume ExecuteFirstOrDefault requires an argument of that type, hence the cast.