C# casting question: from IEnumerable to custom type
- by Sarah Vessels
I have a custom class called Rows that implements IEnumerable<Row>. I often use LINQ queries on Rows instances:
Rows rows = new Rows { row1, row2, row3 };
IEnumerable<Row> particularRows = rows.Where<Row>(row => condition);
What I would like is to be able to do the following:
Rows rows = new Rows { row1, row2, row3 };
Rows particularRows = (Rows)rows.Where<Row>(row => condition);
However, I get a "System.InvalidCastException: Unable to cast object of type 'WhereEnumerableIterator1[NS.Row]' to type 'NS.Rows'". I do have a Rows constructor taking IEnumerable<Row>, so I could do:
Rows rows = new Rows { row1, row2, row3 };
Rows particularRows = new Rows(rows.Where<Row>(row => condition));
This seems bulky, however, and I would love to be able to cast an IEnumerable<Row> to be a Rows since Rows implements IEnumerable<Row>. Any ideas?
