c# retrieve _text type from postgresql

Question

I have a array like [["64", "0", "0"], ["64", "7", "95"], ["61", "28", "165"], ["60", "45", "200"]] in Postgres column which I stored from ruby on rails, and I want to retrieve it in my C# project. When I do this:

NpgsqlDataReader reader = command.ExecuteReader();
DataTable dt = new DataTable();
while (reader.Read())
{
    Console.WriteLine("{0}\t{1}", reader.GetName(0), reader.GetString(1));
}

I get the following exception:

System.InvalidCastException: Can't cast database type _text to String How can I get this column value as an Array But when I do:

dt.Load(reader);

foreach (DataRow row in dt.Rows)
{                
    var points = row["points"];
    var json = new JavaScriptSerializer().Serialize(points);
    Console.WriteLine(json);
}

it returns ["64","0","0","64","7","95","61","28","165","60","45","200"] which is not what I want.

Answer 1

Please try:

string[,] result = row["points"] as string[,]; 

pgSql has an array field defined, so it cannot convert to string directly.