如何在Datatable中取得每列的数据列宽度

using (SqlConnection conn = new SqlConnection("连接字符串"))
            {
                SqlCommand cmd = new SqlCommand("select * from Users", conn);
                conn.Open();
                SqlDataAdapter sda = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                sda.FillSchema(dt, SchemaType.Mapped);//这里用FillSchema方法
                conn.Close();
                Console.WriteLine(dt.Columns[1].MaxLength);//这里就可以获取列的长度了
            }