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Just call function. Also, replace ... with your handling public Result decode(Uri uri) { Bitmap image; try { image = (Bitmap) Bitmap.FromFile(uri.

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The Properties window for the chart data region contains the standard background color, border, and size properties that are associated with the other data regions. However, most of the properties that affect the appearance and behavior of the chart are accessible only in the Chart Properties dialog box. To open the Chart Properties dialog box, you right-click the Chart, and then click Properties. If you ve worked with charting in other applications, most of these properties should be familiar. On the General tab, you can specify a name for the chart for reference in expressions and a title to be displayed in the rendered chart. You can also select from a variety of chart types and subtypes, which are alternate versions of a chart type. You can change style properties for anything you see in the chart: the chart area, the plot area, data values, axis titles, and labels. You can even apply 3-D effects to the chart, if desired. In this procedure, you ll format the chart. Format the chart 1. Click the Layout tab, right-click the chart, and then click Properties. Take a look at the chart type options, but leave the default chart type. In this dialog box, you can also set the Chart Area and Plot Area styles. 2. Click the Y Axis tab and type C0 in the Format Code box. 3. In the Title box, type a label for the Y axis: Sales. 4. Click the Style Properties icon next to the Title box, click 8pt in the Size drop-down list, and then click OK.

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[Class] public class User : VersionedEntity { private string name; [Property(Length = 64, Access = "field.camelcase-underscore")] string Name { ... } }

Without the information Length = 64, a careless developer may think that names can be unlimited in length and the user will find that the application truncates a name for an unknown reason.

You can see that using VersionedEntity makes this implementation free of code unrelated to the business domain, without sacrificing functionality.

The fact that the domain model isn t aware of other layers (like the presentation layer) means that it can t directly inform those layers about any events that occur (for example, when a change occurs in the domain model, the GUI may need to be refreshed). Fortunately, a pattern is available to solve this kind of problem.

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The Observer pattern lets an object pass information to other objects without knowing about them up front. The object that sends the notifications is called the subject, and the objects that receive the notifications are the observers. This pattern is often used in a WinForms MVC architecture, as explained in section 8.1.1. In .NET, you can implement this pattern using events. You add an event to your class, and then the observers must register with the event in order to receive notifications. Most of the time, the registration is done just after the entity is created or loaded. Let s look at an example that illustrates how to implement this pattern. In the previous example, the class User has a property Name. If you want to inform the presentation layer when this property changes, this is the direct (and bad) way:

5. Click the 3D Effect tab, select the check box to enable the 3-D settings, select the Cylinder check box, and then move the sliders to change the settings as follows:

public class User { public string Name { get { return name; } set { if (name==value) return; name = value; PresentationLayer.User_NameChanged(this); } } }

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Here, you assume that the entity has access to the presentation layer, which provides a method to call when the entity changes. The problem, in this implementation, is that the entity is tied to the presentation layer and that s bad because you can t use the entity in any other context (for example, when testing). Here s the solution, using the Observer pattern:

public delegate void NameChangedEventHandler( object sender, EventArgs e ); public class User { private string name; public string Name { get { return name; } set { if (name==value) return; name = value; OnNameChanged(); } } public event NameChangedEventHandler NameChanged; protected virtual void OnNameChanged() { if (NameChanged != null) NameChanged(this, EventArgs.Empty); } }

Setting Horizontal rotation Perspective Wall thickness Vertical rotation Value 5 0% 10% 0

You first define a delegate for the NameChanged event. Then, in the implementation of the property (Name), you raise the event after changing the property s value. The code to raise the event is in the OnNameChanged() method. Using a separate method is a recommended guideline from the official .NET documentation, which discusses the implementation and use of events. The next step is to listen to the event:

User user = BusinessLayer.LoadUser(userId); user.NameChanged += User_NameChanged;

In this code, you load a user and register the NameChanged event. The method User_NameChanged() will be called whenever this property changes. Note that the .NET framework provides an INotifyPropertyChanged interface for this scenario. Here s an implementation of the User class inheriting from this interface:

6. Click OK. 7. Save and preview the report. The chart now looks like this:

using System.ComponentModel; public class User : INotifyPropertyChanged {

private string name; public string Name { get { return name; } set { if (name==value) return; name = value; OnPropertyChanged("Name"); } } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } }

This solution is similar to the previous one. But it has the benefit of working well with other mechanisms in the .NET framework, such as data binding. You can also use the Observer pattern in many other situations. Here s a securityrelated example:

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