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If you want to make a Polyline act like a Polygon, you can add a final point that s the same as the starting point. You might not think that you can fill in a Polyline unless you do that, but you can. The fill acts as though that last line exists. You can also control (to some extent) the algorithm used to fill in the shape; this fact matters when you have lines that cross one another. You can control the behavior by setting the FillRule. But, this isn t something you usually have to worry about.

need to extend NetworkDiscovery to store a reference to a second object too and to signal events to both of them. Fortunately, the iPhone SDK provides a much better solution for propagating such events between different components, called notifications. Notifications are arbitrary strings that are posted to some notification center. Other components may indicate their interest in certain notifications by registering as an observer, specifying an object instance and an Objective-C message selector. The notification center will then send the specified message to the specified object instance if the observed notification is posted. Although it is possible to create an arbitrary number of notification centers, it is usually sufficient to just use the application s default notification center returned by [NSNotificationCenter defaultCenter]. Listing 8-14 shows how to register as an observer, requesting the function onPeersChanged: to be called should the notification PeersChanged be posted by any other component. By specifying something other than nil for the parameter object:, you could restrict your observation to notification posted by a specific sender.

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Localizing Visual Web Part user controls User controls in Visual Web Parts don t have access to resources other than those deployed into the App_GlobalResources folder. This means that if you re building Web Parts based on Visual Web Parts, you have to use two kinds of resources:

To index elements in more than one dimension, you can use either a multidimensional array or a jagged array.

quickly resolve any issues hopefully the support team will even be able to resolve it before it ends up on your desk In large-scale scenarios with possibly hundreds of thousands of users, it can be difficult to track down a single problem by searching the log files of the application SharePoint has solved this issue by using a unique id for each request When an error occurs, SharePoint presents that id to the user, who can then send it to the support team using, for example, a screen dump By giving your Web Parts the ability to be monitored and using the SharePoint logging facilities, you can cut down the time needed to find the source of problems Once you ve figured out where and how the error happened, you have to reproduce this error to devise a resolution You need different tools, depending on the type of error.

Tangentially related to thread safety are the potential problems with collections that maintain weak references to objects. Garbage collection runs concurrently and can collect weakly referenced objects at any time. Collections that maintain weak references can spontaneously lose objects or return nil values. This can affect their count and enumerations. Specifically, be mindful of these potential problems: The collection -count can change at any time. Any previously stored value in an array may return nil. Any member of a dictionary or set may spontaneously disappear. A fast enumeration may iterate over nil values anywhere during the enumeration. NSEnumerator objects should not be used when the collection uses weak references. The -nextObject message could return nil for any value, which would be interpreted as the end of the enumeration. Use fast enumeration or programmatic iteration. If these effects are problematic, you can eliminate them by making a temporary copy of the collection using a collection object that uses strong references. Enumerate the values of the copy, and then forget the temporary collection.

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