ASP.NET Web PDF Document Viewer/Editor Control Library

var eventsByStartTime = from ev in events orderby ev.StartTime.TimeOfDay select ev;

You can specify multiple criteria. Example 8-13 sorts the events: first by date (ignoring the time) and then by duration.

var eventsByStartDateThenDuration = from ev in events orderby ev.StartTime.Date, ev.Duration select ev;

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Updates are an important reason why you should never haxxor a module: it makes it difficult to update. If you hack a module, make sure to create a patch so that when you upgrade, you can apply the patch to the module to restore your previous hacks. The patch may not always apply, because code in the module may have changed, but having the patch around will help you understand the reason for the change in the first place.

<ControllerName>/EditorTemplates/<TemplateName>.ascx (or .aspx) Shared/EditorTemplates/<TemplateName>.ascx (or .aspx)

Four LINQ query operator methods correspond to the orderby clause. Most obviously, there s OrderBy, which takes a single ordering criterion as a lambda:

var eventsByStartTime = events.OrderBy(ev => ev.StartTime);

The template helper methods try each folder in sequence, and for each search folder they run through a list of template names to find a match. The template names also follow a particular algorithm:

That code has exactly the same effect as Example 8-12. Of course, like most LINQ operators, you can chain this together with other ones. So we could combine that with the Where operator:

var longEvents = events.OrderBy(ev => ev.StartTime). Where(ev => ev.Duration > TimeSpan.FromHours(2));

3. 4.

This is equivalent to the following query:

Step 1 Search location The template name passed in through the display or editor helper template methods (defaults to null) The ModelMetadata.TemplateHint value (populated from the [UIHint] attribute by default) The ModelMetadata.DataTypeName value (populated from the [DataType] attribute by default) The model type (if a nullable type, then the underlying type) If the model type is... Not a complex type (a type converter exists from the model type to String) An IEnumerable Any other interface 6 The template used is

var longEvents = from ev in events orderby ev.StartTime where ev.Duration > TimeSpan.FromHours(2) select ev;

You can customize the comparison mechanism used to sort the items by using an overload that accepts a comparison object it must implement IComparer<TKey> where TKey is the type returned by the ordering expression. So in these examples, it would need to be an IComparer<DateTimeOffset>, since that s the type of the StartTime property we re using to order the data. There s not a lot of scope for discussion about what order dates come in, so this is not a useful example for plugging in an alternate comparison. However, string comparisons do vary a lot different languages have different ideas about what order letters come in, particularly when it comes to letters with accents. The .NET Framework class library offers a StringComparer class that can provide an IComparer<string> implementation for any language and culture supported in .NET. The following example uses this in conjunction with an overload of the OrderBy operator to sort the events by their title, using a string sorting order appropriate for the French-speaking Canadian culture, and configured for case insensitivity:

Recursively search the base types, one by one, and search the Type.Name. If the item is an IEnumerable, search the name "Collection", then "Object".

CultureInfo cult = new CultureInfo("fr-CA"); // 2nd argument is true for case insensitivity StringComparer comp = StringComparer.Create(cult, true); var eventsByTitle = events.OrderBy(ev => ev.Title, comp);

There is no equivalent query expression if you want to use anything other than the default comparison for a type, you must use this overload of the OrderBy operator.

Run the update.php script by navigating to http://example.com/update.php. If the update was successful, put your production site in maintenance mode, and follow the same process.

This is very similar to IComparable<T>, introduced in the preceding chapter. But while objects that implement IComparable<T> can themselves be compared with other objects of type T, an IComparer<T> compares two objects of type T the objects being compared are separate from the comparer.

For example, suppose we want to display a custom ChangePasswordModel template for our model for the Change Password screen. We already have a complete model object, so we can define a template matching the name of the model type, ChangePasswordModel. Because this template is specific to our AccountController, we place the template in an EditorTemplates folder underneath the account-specific view folder, as shown in figure 3.3.