If you want something that’ll convert to arbitrary JSON, you could convert by serializing it into a Dictionary(Of string, object) thusly:
public IEnumerable<Dictionary<string, object>> Serialize(SqlDataReader reader)
{
var results = new List<Dictionary<string, object>>();
var cols = new List<string>();
for (var i = 0; i < reader.FieldCount; i++)
cols.Add(reader.GetName(i));
while (reader.Read())
results.Add(SerializeRow(cols, reader));
return results;
}
private Dictionary<string, object> SerializeRow(IEnumerable<string> cols,
SqlDataReader reader) {
var result = new Dictionary<string, object>();
foreach (var col in cols)
result.Add(col, reader[col]);
return result;
}
And then use the NewtonSoft.Json JsonConvert object to get your JSON:
var r = Serialize(reader);
string json = JsonConvert.SerializeObject(r, Formatting.Indented);
UPDATE:
If you just want to use built-in methods, and you happen to be using MVC, you can use the built in Json helper method on your newly serialized :
JsonResult Index(int id) {
var r = Serialize(reader);
return Json(r, JsonRequestBehavior.AllowGet);
}