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

This can't be that hard. This is what I've done when I want to return search results to a web page as JSON.

First, have a class like this

public class SearchResult
{
    public string model_no { get; set; }
    public string result_text { get; set; }
    public string url { get; set; }
    public string image_url { get; set; }
}

and then have the code below.

        string sql_text = "select * from product_master where model_no like @search_string and active=1";
        SqlConnection connection = new SqlConnection(sql_constr);
        SqlCommand cmd = new SqlCommand(sql_text, connection);
        cmd.Parameters.AddWithValue("@search_string", "%" + search_string + "%");
        connection.Open();

        SqlDataReader rdr = cmd.ExecuteReader();

        List searchresults = new List();

        while (rdr.Read())
        {
            SearchResult sr = new SearchResult();
            sr.model_no = rdr["model_no"].ToString();
            sr.result_text = rdr["product_name"].ToString();
            sr.url = rdr["url_key"].ToString();

            searchresults.Add(sr);

        }
        connection.Close();

        //build json result
        return Json(searchresults, JsonRequestBehavior.AllowGet);

this works for me very well..