List in C# - passing multiple entries as a single object

I have a method (C#)

public void MethodName(List<Order> Order, int ID)

I need to pass this to a main page, in which i know to pass integer value t开发者_开发技巧o ID, am not able to pass multiple items in a single list.

The List order should have two number entries, (ie. Order.number1 and Order.number2)

How should i pass a single list as a parameter to this method containing multiple entries of number1 and 2, so that i can loop thro' and find it.

Thanks.

If I understand this correctly, you have:

class Order
{
  public int number1 { get; set; }
  public int number2 { get; set; }
  ...
}

List<Order> orders = new List<Order>
{
  { number1 = 123, number2 = 234 },
  { number1 = 321, number2 = 432 }
};

You want to be able to search orders to find the one where number1 == ID || number2 == ID. Assuming there is only one Order with the given ID or you are OK using the first one you find you can do:

public Order FindOrderById(List<Order> orders, int id)
{
  foreach (Order order in orders)
  {
    if (order.number1 == id || order.number2 == id)
    {
      return order;
    }
  }

  // None found.  Return null, throw exception, etc.
  return null;
}

...

List<Order> orders = new List<Order> { ... };
Order foundOrder = FindOrderById(orders, 123);
if (foundOrder == null)
{
  //Not found
}
else
{
  //Found
}

You can also use LINQ to shorten this dramatically. I have included some variations.

List<Order> orders = new List<Order> { ... };
int id = 123;

// Throw exception if exactly one order was not found (none or more than one)
Order foundOrder = orders.Single(o => o.number1 == id || o.number2 == id);

// Return null if exactly one order was not found
Order foundOrder = orders.SingleOrDefault(o => o.number1 == id || o.number2 == id);

// Return all orders that matched
IEnumerable<Order> foundOrders = orders.Where(o => o.number1 == id || o.number2 == id);

You can use a class that implements the IList interface. Such as list.

You could do something like:

List<Order> myOrders = new List<Order>();

Then pass this in to the method.

Where Order is the order object that you are trying to access.

You can return a list from your method (if I'm understanding you correctly)

Edited now that I think I understand better

public void MethodName(List<item> order, int ID) {
foreach(Order O in Order)
  {
   RunQuery(O.num1, O.num2);
  }
}

Without some knowledge of how your database is set up it's tough to write the query code; I leave that to you.