convert from SqlDataReader to JSON

Question

public string toJSON(SqlDataReader o)
{
    StringBuilder s = new StringBuilder();
    s.Append(\"[\");
    if (o.HasRows)
        while (o.Read())
            s.App         


        

Answer 1

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> Serialize(SqlDataReader reader)
{
    var results = new List>();
    var cols = new List();
    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 SerializeRow(IEnumerable cols, 
                                                SqlDataReader reader) {
    var result = new Dictionary();
    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);
}