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Question

I need to build two objects: an OrderList and an Order.

Using those two objects, I have to populate a DataGridView with a history of the orders. However, I am instructed not to use binding sources for the connection or other drag and drop controls. Unfortunately, from Google it seems like those are the most popular options for this type of problem.

Can anyone point me in the right direction? I don't have much experience with C#.

Thanks.

Answer 1

You could to create an Order class:

public class Order
{
    public int OrderID { get; set; }
    public DateTime OrderDate { get; set; }
}

Read your database records and load your orders collection

List<Order> orders = new List<Order>();
using(SqlConnection cn = new SqlConnection("..."))
using (SqlCommand cm = cn.CreateCommand())
{
    cn.Open();
    cm.CommandText = "SELECT OrderId, OrderDate FROM Orders";
    SqlDataReader dr = cm.ExecuteReader();
    while (dr.Read())
    {
        orders.Add(new Order()
        {
            OrderId = dr.GetInt32(dr.GetOrdinal("OrderId")),
            OrderDate = dr.GetDateTime(dr.GetOrdinal("OrderDate"))
        });
    }
}

About GridView part, you should take a look into ASP.NET data binding overview

Answer 2

This is actually a fairly trivial problem. You will need to use these things:

• DataAdapter (SQL, OleDB, etc)
• DataGridView (or DataGrid)

Once you have a dataadapter and its associated dataset, you can simply loop to fill the grid.

Answer 3

您可以绑定到任何实现IEnumerable的数据集合，因为当您在网格上调用DataBind（）函数时，它将遍历数据并将网格通过反射（使用反射）绑定到集合中存储的每个对象的属性。对象并寻找与为网格中每个绑定字段指定的DataField匹配的属性。