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Figure 31-3. The propdp code snippet provides a starting point for building a dependency property After you have typed propdp, press the Tab key twice. You will find the snippet expands to give you the basic skeleton of a dependency property (Figure 31-4). Each role sees a separate cached block.* Each user sees a separate cached block. Each page has its own cached block. Blocks are cached once for all users. rdlc pdf 417 PDF417 Barcode Creating Library for RDLC Reports | Generate ...
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NET web & IIS applications; Easy to draw & create 2D PDF - 417 barcode images in jpeg, gif, png and bitmap files; Able to generate & print PDF - 417 in RDLC ... Figure 31-4. The expanded snippet The simplest version of the CurrentNumber property will look like so: public partial class ShowNumberControl : UserControl { public int CurrentNumber { get { return (int)GetValue(CurrentNumberProperty); } set { SetValue(CurrentNumberProperty, value); } } public static readonly DependencyProperty CurrentNumberProperty = DependencyProperty.Register("CurrentNumber", typeof(int), typeof(ShowNumberControl), new UIPropertyMetadata(0)); ... } This is similar to what you saw in the implementation of the Height property; however, the code snippet registers the property inline rather than within a static constructor (which is fine). Also notice that a UIPropertyMetadata object is used to define the default value of the integer (0) rather than the more complex FrameworkPropertyMetadata object. rdlc pdf 417 PDF - 417 Client Report RDLC Generator | Using free sample for PDF ...
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Free trial package available to insert PDF - 417 barcode image into Client Report RDLC . Although you now have a dependency property named CurrentNumber, you still won t see your animation take hold. The next adjustment you might want to make is to specify a function to call to perform some data validation logic. For this example, assume that you need to ensure that the value of CurrentNumber is between 0 and 500. To do so, add a final argument to the DependencyProperty.Register() method of type ValidateValueCallback, which points to a method named ValidateCurrentNumber. ValidateValueCallback is a delegate that can only point to methods returning bool and take an object as the only argument. This object represents the new value that is being assigned. Implement ValidateCurrentNumber to return true or false, if the incoming value is within the expected range: public static readonly DependencyProperty CurrentNumberProperty = DependencyProperty.Register("CurrentNumber", typeof(int), typeof(ShowNumberControl), new UIPropertyMetadata(100), new ValidateValueCallback(ValidateCurrentNumber)); public static bool ValidateCurrentNumber(object value) { // Just a simple business rule. Value must be between 0 and 500. if (Convert.ToInt32(value) >= 0 && Convert.ToInt32(value) <= 500) return true; else return false; } rdlc pdf 417 How to add Barcode to Local Reports ( RDLC ) before report ...
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Barcode Control SDK supports generating Data Matrix, QR Code, PDF - 417 barcodes in RDLC Local Report using VB and C# class library both in ASP.NET and ... * Default for blocks that do not declare a cache setting All blocks that are cached are cached on a per-theme and per-language basis. This prevents users from seeing a block that is themed by a theme other than the one the user is viewing when multiple themes are enabled, and it prevents blocks from showing up in the wrong language when multiple languages are enabled. OK, so now you have a valid number, but still no animation. The final change you need to make is to specify a second argument to the constructor of UIPropertyMetadata, which is a PropertyChangedCallback object. This delegate can point to any method that takes a DependencyObject as the first parameter and a DependencyPropertyChangedEventArgs as the second. First, update your code as so: // Note the second param of UIPropertyMetadata construtor. public static readonly DependencyProperty CurrentNumberProperty = DependencyProperty.Register("CurrentNumber", typeof(int), typeof(ShowNumberControl), new UIPropertyMetadata(100, new PropertyChangedCallback(CurrentNumberChanged)), new ValidateValueCallback(ValidateCurrentNumber)); Within the CurrentNumberChanged() method, your ultimate goal is to change the Content of the Label to the new value assigned by the CurrentNumber property. You have one big problem, however: the CurrentNumberChanged() method is static, as it must be to work with the static DependencyProperty object. So how are you supposed to gain access to the Label for the current instance of ShowNumberControl That reference is contained in the first DependencyObject parameter. You can find the new value using the incoming event arguments. Here is the necessary code which will change the Content property of the Label: private static void CurrentNumberChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs args) { // Cast the DependencyObject into ShowNumberControl ShowNumberControl c = (ShowNumberControl)depObj; // Get the Label control in the ShowNumberControl. Label theLabel = c.numberDisplay; // Set the label with the new value. theLabel.Content = args.NewValue.ToString(); } Whew! That was a long way to go just to change the output of a label. The benefit is that your CurrentNumber dependency property can now be the target of a WPF style, an animation object, the target of a data binding operation, and so forth. Figure 31-5 shows your completed application (and yes, it really is changing the value while running). Note Blocks are never cached for the superuser (user 1).
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