用于查询SQL Server并返回结果的Web API未按预期工作

[HttpGet]
public HttpResponseMessage Getdetails(string ROOM)
{
    string commandText = "SELECT * from [TDB].[dbo].[results_vw] where ROOM = @ROOM_Data";

    string connStr = ConfigurationManager.ConnectionStrings["TDBConnection"].ConnectionString;

    var jsonResult = new StringBuilder();

    using (SqlConnection connection = new SqlConnection(connStr))
    {
        SqlCommand command = new SqlCommand(commandText, connection);
        command.Parameters.Add("@ROOM_Data", SqlDbType.VarChar);
        command.Parameters["@ROOM_Data"].Value = ROOM;

        connection.Open();

        var reader = command.ExecuteReader();

        if (!reader.HasRows)
        {
            jsonResult.Append("[]");
        }
        else
        {
            while (reader.Read())
            {
                jsonResult.Append(reader.GetValue(0).ToString());
            }
        }

        var response = new HttpResponseMessage(System.Net.HttpStatusCode.OK);
        response.Content = new StringContent(jsonResult.ToString());

        connection.Close();

        return response;
    }
}

此代码返回以下结果:

333838362692368203368203368203362692368203359544362692368203362692368203362692368203368203

我希望JSON

 {"data":
  [
  {"R_ID":"368203","ROOM":"K2"}, 
  {"R_ID":"368203","ROOM":"K2"}
  ]}

现在我创建了一个名为 DatabaseResult

public class DatabaseResult
{
      public int r_id { get; set; }
      public string room { get; set; }
}