ASP.NET Web PDF Document Viewer/Editor Control Library

tagList->addItems( tags ); for( int i=0; i<uitagList->count(); ++i ) if( selectioncontains( uitagList->item(i)->text() ) ) uitagList->item(i)->setSelected( true ); } When the constructor has updated the tag list, it s time to update the images by calling the updateImages method The method takes care of updating the imageIds list It also keeps the currently shown image if it is still available in the new list of id values The source code for the method is shown in Listing 13-14 It begins by trying to retrieve the id of the currently shown image If no images are available, the id is set to -1, which is an invalid id The method then continues by getting a new list of image id values from the ImageCollection This list is based on the current selection of tags.

barcode add-in for excel free download, barcode excel 2013 download, how to create barcode in microsoft excel 2003, how to get barcode in excel 2010, barcode font excel free, convert text to barcode in excel 2003, excel barcode add in for windows, barcode generator excel freeware chip, can i create barcodes in excel 2010, excel barcodes,

LINQ provides operators for some common set-based operations. If you have two collections, and you want to discover all the elements that are present in both collections, you can use the Intersect operator:

The next behavior that is available from the AtlasUIGlitz library is the layout behavior, which allows you to specify the dimensions and location of an element. As you can see in Figure 9-2, you can declaratively specify how the content will appear using Atlas Script.

var inBoth = set1.Intersect(set2);

It also offers a Union operator, which provides all the elements from both input sets, but when it comes to the second set it will skip any elements that were already returned because they were also in the first set. So you could think of this as being like Concat,

If the id of the previous image is still in the list of id values, the currentImage index is updated to keep showing the same image If the same image can t be shown, the first image is shown (obviously, no image is shown if there are no images) Because the method affects the currentImage index value, it calls the updateCurrentImage method to update the user interface accordingly..

except it detects and removes duplicates. In a similar vein, there s the Distinct operator this works on a single collection, rather than a pair of collections. Distinct ensures that it returns any given element only once, so if your input collection happens to contain duplicate entries, Distinct will skip over those. Finally, the Except operator returns only those elements from the first set that do not also appear in the second set.

LINQ supports joining of sources, in the sense typically associated with databases given two sets of items, you can form a new set by combining the items from each set that have the same value for some attribute. This is a feature that tends not to get a lot of use when working with object models relationships between objects are usually represented with references exposed via properties, so there s not much need for joins. But joins can become much more important if you re using LINQ with data from a relational database. (Although the Entity Framework, which we describe in a later chapter, is often able to represent relationships between tables as object references. It ll use joins at the database level under the covers, but you may not need to use them explicitly in LINQ all that often.) Even though joins are typically most useful when working with data structured for storage in a relational database, you can still perform joins across objects it s possible with LINQ to Objects even if it s not all that common. In our hypothetical calendar application, imagine that you want to add a feature where you can reconcile events in the user s local calendar with events retrieved from his phone s calendar, and you need to try to work out which of the imported events from the phone correspond to items already in the calendar. You might find that the only way to do this is to look for events with the same name that occur at the same time, in which case you might be able to use a join to build up a list of events from the two sources that are logically the same events:

var pairs = from localEvent in events join phoneEvent in phoneEvents on new { Title = localEvent.Title, Start = localEvent.StartTime } equals new { Title = phoneEvent.Name, Start = phoneEvent.Time } select new { Local = localEvent, Phone = phoneEvent };

A LINQ join expects to be able to compare just a single object in order to determine whether two items should be joined. But we want to join items only when both the title and the time match. So this example builds an anonymously typed object to hold both values in order to be able to provide LINQ with the single object it expects. (You can use this technique for the grouping operators too, incidentally.) Note that this example also illustrates how you would deal with the relevant properties having different names. You can imagine that the imported phone events might use different property names because you might need to use some third-party import library, so this example shows