CalendarEvent[] events = in Visual C#

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CalendarEvent[] events =
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It is followed by the list of objects to add to the array, contained within a pair of braces. If you change that line to this:
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List<CalendarEvent> events = new List<CalendarEvent>
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the initializer list can remain the same. Notice that besides changing the variable declaration to use the List<T> type (with the generic type argument T set to the element type CalendarEvent, of course) we also need an explicit call to the constructor. (Normally, you d expect parentheses after the type name when invoking a constructor, but those are optional when using an initializer list.) As you saw earlier, the use of new is optional when assigning a value to a newly declared array, but C# does not extend that courtesy to other collection types. While we can initialize the list in much the same way as we would an array, the difference is that we are free to add and remove elements later. To add a new element, we can use the Add method:
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CalendarEvent newEvent = new CalendarEvent { Title = "Dean Collins Shim Sham Lesson", StartTime = new DateTimeOffset (2009, 7, 14, 19, 15, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(1) }; events.Add(newEvent);
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This appends the element to the end of the list. If you want to put the new element somewhere other than at the end, you can use Insert:
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events.Insert(2, newEvent);
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The first argument indicates the index at which you d like the new item to appear any items at or after this index will be moved down to make space. You can also remove items, either by index, using the RemoveAt method, or by passing the value you d like to remove to the Remove method (which will remove the first element it finds that contains the specified value).
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List<T> does not have a Length property, and instead offers a Count. This may seem like pointless inconsistency with arrays, but there s a reason. An array s Length property is guaranteed not to change. A List<T> cannot make that guarantee, and so the behavior of its Count property is necessarily different from an array s Length. The use of different names signals the fact that the semantics are subtly different.
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List<T> also offers AddRange, which lets you add multiple elements in a single step. This
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makes it much easier to concatenate lists remember that with arrays we ended up writing the CombineEvents method in Example 7-18 to concatenate a couple of arrays. But with lists, it becomes as simple as the code shown in Example 7-23.
events1.AddRange(events2);
The one possible downside of List<T> is that this kind of operation modifies the first list. Example 7-18 built a brand-new array, leaving the two input arrays unmodified, so if any code happened still to be using those original arrays, it would carry on working. But Example 7-23 modifies the first list by adding in the events from the second list. You would need to be confident that nothing in your code was relying on the first list containing only its original content. Of course, you could always build a brand-new new List<T> from the contents of two existing lists. (There are various ways to do this, but one straightforward approach is to construct a new List<T> and then call AddRange twice, once for each list.)
You access elements in a List<T> with exactly the same syntax as for an array. For example:
Console.WriteLine("List element: " + events[2].Title);
As with arrays, a List<T> will throw an IndexOutOfRangeException if you use too high an index, or a negative index. This applies for writes as well as reads a List<T> will not automatically grow if you write to an index that does not yet exist.
There is a subtle difference between array element access and list element access that can cause problems with custom value types (structs). You may recall that 3 warned that when writing a custom value type, it s best to make it immutable if you plan to use it in a collection. To understand why, you need to know how List<T> makes the square bracket syntax for element access work.
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