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If for UI-related or other implementation reasons you require a specific subset of objects from a query, it’s as simple as taking the IQueryable object, and reading out only the objects you need. Since queries in Realm are lazy, performing this sort of paginating behavior isn’t necessary at all, as Realm will only load objects from the results of the query once they are explicitly accessed.
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This is often done out of necessity to avoid reading too much from disk, or pulling too many results into memory at once. Most other database technologies provide the ability to paginate results from queries (such as the LIMIT keyword in SQLite).
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It is overloaded to take string, character or integer keys, eg: You can retrieve an object by PrimaryKey very quickly using Realm.Find which performs more streamlined query construction than using LINQ, as well as using an index. Trying to create another object with the same key will throw a RealmDuplicatePrimaryKeyValueException. Once an object with a PrimaryKey is added to a Realm, the PrimaryKey cannot be changed. Putting the attribute on multiple properties will compile but is validated at runtime and will throw an exception reporting that Schema validation failed, as soon as you try to open that Realm. They are supported only in case you already have a property of that type. There is no particular storage or performance advantage to using char or smaller integer types. Only chars, integral types, and strings can be used as PrimaryKeys. Declaring a PrimaryKey allows objects to be looked up and updated efficiently and enforces uniqueness for each value. The attribute can be specified on one property in a RealmObject class. You can subscribe to Realm notifications to know when Realm data in an object is updated, indicating when your app’s UI should be refreshed.
#XAMARIN FOR VISUAL STUDIO 2015 EXAMPLES CODE#
For example, if your UI code is dependent on a specific Realm object, you don’t need to worry about refreshing or re-fetching it before triggering a UI redraw. This aspect of RealmObject not only keeps Realm fast and efficient, it allows your code to be simpler and more reactive. I have already featured a few of these great looking apps, but here are a few more to get you inspired.// Define your models like regular C# classes public class Dog : RealmObject myDog. Our very own Javier has been collecting amazing examples great looking open-source apps built with Xamarin.Forms for several years now that you can browse through on GitHub. Island Tracker using community & Syncfusion controls by me! Get Inspired Be sure to check out the wide number of options when you’re ready to get started!
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Re-usable UI components from top component vendors like Telerik, UX Divers, GrapeCity, and Syncfusion help you get productive quickly. Finally, we cannot forget SkiaSharp a general purpose 2D graphics system for. But there are even more awesome controls from the community including the fabulous Magic Gradients, PancakeView, MaterialFrame, CardView, Shadows, and so many more. The Xamarin Community Toolkit continues to add great controls including a DockLayout, Shield, TabView, and more. Drink gallery app by Javier Suárez Go further with custom community controls