how to generate qr code in asp.net using c# Array.Sort(events); // Works, now that CalendarEvent is IComparable<T> in C#.NET

Draw QR Code in C#.NET Array.Sort(events); // Works, now that CalendarEvent is IComparable<T>

Array.Sort(events); // Works, now that CalendarEvent is IComparable<T>
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Getting your array contents in order isn t the only reason for relocating elements, so Array offers some slightly less specialized methods for moving data around.
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Moving or copying elements
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Suppose you want to build a calendar application that works with multiple sources of information maybe you use several different websites with calendar features and would like to aggregate all the events into a single list. Example 7-18 shows a method that takes two arrays of CalendarEvent objects, and returns one array containing all the elements from both.
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static CalendarEvent[] CombineEvents(CalendarEvent[] events1, CalendarEvent[] events2) {
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CalendarEvent[] combinedEvents = new CalendarEvent[events1.Length + events2.Length]; events1.CopyTo(combinedEvents, 0); events2.CopyTo(combinedEvents, events1.Length); } return combinedEvents;
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This example uses the CopyTo method, which makes a complete copy of all the elements of the source array into the target passed as the first argument. The second argument says where to start copying elements into the target Example 7-18 puts the first array s elements at the start (offset zero), and then copies the second array s elements directly after that. (So the ordering won t be very useful you d probably want to sort the results after doing this.) You might sometimes want to be a bit more selective you might want to copy only certain elements from the source into the target. For example, suppose you want to remove the first event. Arrays cannot be resized in .NET, but you could create a new array that s one element shorter, and which contains all but the first element of the original array. The CopyTo method can t help here as it copies the whole array, but you can use the more flexible Array.Copy method instead, as Example 7-19 shows.
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static CalendarEvent[] RemoveFirstEvent(CalendarEvent[] events) { CalendarEvent[] croppedEvents = new CalendarEvent[events.Length - 1]; Array.Copy( events, // Array from which to copy 1, // Starting point in source array croppedEvents, // Array into which to copy 0, // Starting point in destination array events.Length - 1 // Number of elements to copy ); return croppedEvents; }
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The key here is that we get to specify the index from which we want to start copying 1 in this case, skipping over the first element, which has an index of 0.
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In practice, you would rarely do this if you need to be able to add or remove items from a collection, you would normally use the List<T> type that we ll be looking at later in this chapter, rather than a plain array. And even if you are working with arrays, there s an Array.Resize helper function that you would typically use in reality it calls Array.Copy for you. However, you often have to copy data between arrays, even if it might not be strictly necessary in this simple example. A more complex example would have obscured the essential simplicity of Array.Copy.
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The topic of array sizes is a little more complex than it first appears, so let s look at that in more detail.
Array Size
Arrays know how many elements they contain several of the previous examples have used the Length property to discover the size of an existing array. This read-only property is defined by the base Array class, so it s always present.* That may sound like enough to cover the simple task of knowing an array s size, but arrays don t have to be simple sequential lists. You may need to work with multidimensional data, and .NET supports two different styles of arrays for that: jagged and rectangular arrays.
Arrays of arrays (or jagged arrays)
As we said earlier, you can make an array using any type as the element type. And since arrays themselves have types, it follows that you can have an array of arrays. For example, suppose we wanted to create a list of forthcoming events over the next five days, grouped by day. We could represent this as an array with one entry per day, and since each day may have multiple events, each entry needs to be an array. Example 7-20 creates just such an array.
static CalendarEvent[][] GetEventsByDay(CalendarEvent[] allEvents, DateTime firstDay, int numberOfDays) { CalendarEvent[][] eventsByDay = new CalendarEvent[numberOfDays][]; for (int day = 0; day < numberOfDays; ++day) { DateTime dateOfInterest = (firstDay + TimeSpan.FromDays(day)).Date; CalendarEvent[] itemsOnDateOfInterest = Array.FindAll(allEvents, e => e.StartTime.Date == dateOfInterest); } } eventsByDay[day] = itemsOnDateOfInterest;
return eventsByDay;
* There s also a LongLength, which is a 64-bit version of the property, which theoretically allows for larger arrays than the 32-bit Length property. However, .NET currently imposes an upper limit on the size of any single array: it cannot use more than 2 GB of memory, even in a 64-bit process. So in practice, LongLength isn t very useful in the current version of .NET (4). (You can use a lot more than 2 GB of memory in total in a 64-bit process the 2 GB limit applies only to individual arrays.)
We ll look at this one piece at a time. First, there s the method declaration:
static CalendarEvent[][] GetEventsByDay(CalendarEvent[] allEvents, DateTime firstDay, int numberOfDays) {
The return type CalendarEvent[][] is an array of arrays, denoted by two pairs of square brackets. You re free to go as deep as you like, by the way it s perfectly possible to have an array of arrays of arrays of arrays of anything. The method s arguments are fairly straightforward. This method expects to be passed a simple array containing an unstructured list of all the events. The method also needs to know which day we d like to start from, and how many days we re interested in. The very first thing the method does is construct the array that it will eventually return:
CalendarEvent[][] eventsByDay = new CalendarEvent[numberOfDays][];
Just as new CalendarEvent[5] would create an array capable of containing five CalendarEvent elements, new CalendarEvent[5][] would create an array capable of containing five arrays of CalendarEvent objects. Since our method lets the caller specify the number of days, we pass that argument in as the size of the top-level array. Remember that arrays are reference types, and that whenever you create a new array whose element type is a reference type, all the elements are initially null. So although our new eventsByDay array is capable of referring to an array for each day, what it holds right now is a null for each day. So the next bit of code is a loop that will populate the array:
for (int day = 0; day < numberOfDays; ++day) { ... }
Inside this loop, the first couple of lines are similar to the start of Example 7-14:
DateTime dateOfInterest = (firstDay + TimeSpan.FromDays(day)).Date; CalendarEvent[] itemsOnDateOfInterest = Array.FindAll(allEvents, e => e.StartTime.Date == dateOfInterest);
The only difference is that this example calculates which date to look at as we progress through the loop. So Array.FindAll will return an array containing all the events that fall on the day for the current loop iteration. The final piece of code in the loop puts that into our array of arrays:
eventsByDay[day] = itemsOnDateOfInterest;
Once the loop is complete, we return the array:
} return eventsByDay;
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