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This means the operators can be used to simulate a dynamic lookup of a property or a method on an object. This dynamic lookup can use any dynamic/reflective technique available to you. One such technique is to use .NET reflection to look up and/or set the properties of an object: open System.Reflection let ( ) (obj:obj) (nm:string) : 'T = obj.GetType().InvokeMember(nm, BindingFlags.GetProperty, null, obj, [| |]) |> unbox<'T> let ( <-) (obj:obj) (nm:string) (v:obj) : unit = obj.GetType().InvokeMember(nm, BindingFlags.SetProperty, null, obj, [| v |]) |> ignore Now, you can use the operators to dynamically query data as follows: type Record1 = { Length : int; mutable Values : int list } let obj1 = box [1;2;3] let obj2 = box { Length = 4; Values = [3;4;5;7] } let n1 : int = obj1 Length let n2 : int = obj2 Length let valuesOld : int list = obj2 Values Here, both obj1 and obj2 have type obj, but you can do dynamic lookups of the properties Length and Values using the operator. Of course, these uses aren t strongly statically typed this is why you need the type annotations : int and : int list to indicate the return type of the operation. Given the earlier definition of the ( <-) operator, you can also set a property dynamically as follows:
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Figure 4-20. Database Properties 5. Click Cancel to close this dialog box.
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Figure 8-4. APIs that return the ClickOnce data directory Note that all three APIs have the same result. If you installed the application, your results will be different from what is shown in Figure 8-4; ClickOnce puts the data directory somewhere within the deployment folder, and the deployment folder is generated using an unpublished algorithm. The previous example was fairly convoluted to demonstrate that you can persist application state in the ClickOnce data directory. Persisting application state, saving preferences, and maintaining settings are some uses of the data directory. You ll also sometimes need to deploy files from your solution to the data directory. Files in your deployment marked as Data File are copied to the ClickOnce data directory. The purpose of the data directory is to store state on a user-by-user basis and on an application version level. This means if you have several users working with an application that stores a data file in the data directory, changes made by one user will not be visible to other users on the machine. Moreover, from a smart client perspective, this means if an application stores offline state in the ClickOnce data directory, then the state will need to be synchronized with the back-end database server when the application goes online. Thus, you should treat the data directory as a place to store offline state for an application and remember to synchronize with the back-end database server when the connection is restored. You will also need to remember to clear the state after going online to prevent appending state information from online/offline sessions. Finally, realize that the content of the data directory is meant to be managed by the application, and when the user removes the application, the contents of the data directory for that user are also deleted.
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Now what you will do is add code to first show the animation when the search for images is initiated, and then stop the animation once that search is complete. To start the animation you have just created once the user initiates search for Flickr images, you will call the Begin method of the loadingImages animation. In MainPage.xaml.cs, change the code that creates an Observer for the KeyUp event to the following: keys.ObserveOn(Deployment.Current.Dispatcher).Subscribe(evt => { if (txtSearchTerms.Text.Length > 0) { lblSearchingFor.Text = "Searching for ..." + txtSearchTerms.Text; lblLoading.Visibility=System.Windows.Visibility.Visible; loadingImages.Begin(); webResults.Navigate(new Uri("http://www.flickr.com/search/ q=" + txtSearchTerms.Text)); } });
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CHAPTER 12: Everything Else
Arrays are often used as private data inside a class. Usually you will want to control access to your internal array to make sure the data it contains retains integrity. It s a bad idea to return an internal instance of an array. If you do, you lose control over the data in your array. You may also want to create a class that can be used as an array. In classic C++ you could define the indirection operator (operator[]). In C++/CLI, you can still do that, and you can also use what s called a default indexed property, which you ll learn more about in 7.
To generate XML documentation from source code comments, you need to open the project properties dialog box (Figure 11-38).
#import <UIKit/UIKit.h> int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; }
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