DA.FillSchema() 

DS.Table("Name").PrimaryKey

或者使用下面演示的方法调用sp_fkey

代码段from和Another Link

private void LoanSchema()
    {

         private List<String> tablesList = new List<String>();
         private Dictionary<String,String> columnsDictionary = new Dictionary<String,String>();

          string connectionString = "Integrated Security=SSPI;" +
          "Persist Security Info = False;Initial Catalog=Northwind;" +
          "Data Source = localhost";
          sqlConnection connection = new sqlConnection();
          connection.ConnectionString = connectionString;
          connection.Open();

          sqlCommand command = new sqlCommand();
          command.Connection = connection;
          command.CommandText = "exec sp_tables";
          command.CommandType = CommandType.Text;

          sqlDataReader reader = command.ExecuteReader();

           if (reader.HasRows)
           {
               while (reader.Read())
                  tablesList.Add(reader["TABLE_NAME"].ToString());
           }
           reader.Close();

           command.CommandText = "exec sp_columns @table_name = '" +
           tablesList[0] + "'";
           command.CommandType = CommandType.Text;
           reader = command.ExecuteReader();

            if (reader.HasRows)
            {
                while (reader.Read())
                          columnsDictionary.Add(reader["COLUMN_NAME"].ToString(),reader["TYPE_NAME"].ToString());
             }
}