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TreeView controls are often used to hold huge amounts of data. That s because the TreeView display is collapsible. Even if the user scrolls from top to bottom, not all the information is necessarily visible. The information that isn t visible can be omitted from the TreeView altogether, reducing its overhead (and the amount of time required to fill the tree). Even better, each TreeViewItem fires an Expanded event when it s opened and a Collapsed event when it s closed. You can use this point in time to fill in missing nodes or discard ones that you don t need. This technique is called just-in-time node creation. Just-in-time node creation can be applied to applications that pull their data from a database, but the classic example is a directory-browsing application. In current times, most people have huge, sprawling hard drives. Although you could fill a TreeView with the directory structure of a hard drive, the process is aggravatingly slow. A better idea is to begin with a partially collapsed view and allow the user to dig down into specific directories (as shown in Figure 22-6). As each node is opened, the corresponding subdirectories are added to the tree a process that s nearly instantaneous. asp.net code 39 barcode .NET Code - 39 Generator for .NET, ASP . NET , C#, VB.NET
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24 Sep 2015 ... Introduction. The purpose of this article is to create a simple class that will generate the image of a Code 39 barcode from a string as input. Using a just-in-time TreeView to display the folders on a hard drive is nothing new. (In fact, the technique is demonstrated in my book Pro .NET 2.0 Windows Forms and Custom Controls in C# [Apress, 2005].) However, event routing makes the WPF solution just a bit more elegant. The first step is to add a list of drives to the TreeView when the window first loads. Initially, the node for each drive is collapsed. The drive letter is displayed in the header, and the DriveInfo object is stored in the TreeViewItem.Tag property to make it easier to find the nested directories later without re-creating the object. (This increases the memory overhead of the application, but it also reduces the number of file-access security checks. The overall effect is small, but it improves performance slightly and simplifies the code.) Here s the code that fills the TreeView with a list of drives, using the System.IO.DriveInfo class: foreach (DriveInfo drive in DriveInfo.GetDrives()) { TreeViewItem item = new TreeViewItem(); item.Tag = drive; item.Header = drive.ToString(); item.Items.Add("*"); treeFileSystem.Items.Add(item); } This code adds a placeholder (a string with an asterisk) under each drive node. The placeholder is not shown, because the node begins in a collapsed state. As soon as the node is expanded, you can remove the placeholder and add the list of subdirectories in its place. qr code generator free excel, word code 128, asp.net ean 13, .net core qr code, vb.net qr code reader free, barcode printing in vb net asp.net code 39 Code-39 Full ASCII - Free Online Barcode Generator
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Mature Code 39 Barcode Generator Library for creating and drawing Code 39 barcodes for ASP . NET , C#, VB.NET, and IIS applications. Note The placeholder is a useful tool that can allow you to determine whether the user has expanded this There are a few architectural choices available that facilitate executing arbitrary ViewModel code on the UI dispatcher thread. Both have their pros and cons, and it is up you to decide which. The only constraint is that it is probably best to be consistent within an individual project to avoid confusion. Executing code on the dispatcher is simple enough, but a reference to the UI dispatcher is needed, and this complicates matters somewhat (see Listing 4 26). Listing 4 26. Executing Code on the Dispatcher Thread void TimerElapsed(object sender, ElapsedEventArgs e) { _uiDispatcher.Invoke( (Action)delegate { Messages.Add("Timer fired!"); } ); } This code requests that the UI dispatcher call the supplied anonymous delegate on the correct thread. There are a number of overloads for Invoke that allow parameterization of the task s priority, a timeout for signalling that the operation has failed, and parameters to pass into the delegate. asp.net code 39 barcode C# Code 39 Generator Library for . NET - BarcodeLib.com
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Download and Integrate VB.NET Code 39 Generator Control in VB.NET Project, making linear barcode Code 39 in VB.NET, ASP . NET Web Forms and Windows ... folder to view its contents yet. However, the primary purpose of the placeholder is to make sure the expand icon appears next to this item. Without that, the user won t be able to expand the directory to look for subfolders. If the directory doesn t include any subfolders, the expand icon will simply disappear when the user attempts to expand it, which is similar to the behavior of Windows Explorer when viewing network folders. asp.net code 39 ASP . NET Code 39 Generator generate, create barcode Code 39 ...
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