Part IV in Visual Studio .NET

Generating PDF 417 in Visual Studio .NET Part IV

Part IV
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<Button Style= {StaticResource buttonStyle} Panel.ZIndex= 1 Height= 23 Margin= 0,0,0,0 Name= button2 Width= 76 > Button </Button> <Image Panel.ZIndex= 0 Margin= 0,0,0,0 Name = image1 > <Image.Source> <BitmapImage UriSource= Bell.gif /> </Image.Source> </Image> </Grid> </Window>
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Notice that both buttons now appear in the Design View window using the same style. Note The code you have just entered references the button style by using the
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StaticResource rather than the DynamicResource keyword. The scoping rules of static resources are like those of C# in that they require you to de ne a resource before you can reference it. In step 1 of this exercise, you referenced the buttonStyle style above the XAML code that de ned it, so the style name was not actually in scope. This out-of-scope reference works because using DynamicResource defers until run time the time at which the resource reference is resolved, at which point the resource should have been created. Generally speaking, static resources are more ef cient than dynamic ones are because they are resolved when the application is built, but dynamic resources give you more exibility. For example, if the resource itself changes as the application executes (you can write code to change styles at run time), any controls referencing the style using StaticResource will not be updated, but any controls referencing the style using DynamicResource will be. There are many other differences between the behavior of static and dynamic resources and restrictions on when you can reference a resource dynamically. For more information, consult the .NET Framework documentation provided with Visual Studio 2008.
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There is still a little bit of repetition involved in the de nition of the style; each of the properties (background, foreground, and font family) explicitly state that they are button properties. You can remove this repetition by specifying the TargetType attribute in the Style tag. 3. Modify the de nition of the style to specify the TargetType attribute, like this:
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<Style x:Key= buttonStyle TargetType= Button > <Setter Property= Background Value= Gray /> <Setter Property= Foreground Value= White /> <Setter Property= FontFamily Value= Comic Sans MS /> </Style>
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You can add as many buttons as you like to the form, and you can style them all using the buttonStyle style. But what about other controls, such as labels and text boxes 4. In the Design View window, click the Window1 form, and then click the Toolbox tab. In the Common section, click TextBox, and then click anywhere in the lower half of the form.
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22
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5. In the XAML pane, change the de nition of the text box control and specify the Style attribute shown in bold type in the following example, attempting to apply the buttonStyle style:
<TextBox Style= {StaticResource buttonStyle} Height= 21 Margin= 114,0,44,58 Name= textBox1 VerticalAlignment= Bottom />
Not surprisingly, attempting to set the style of a text box to a style intended for a button fails. The Design View window displays the error message The document root element has been altered or an unexpected error has been encountered in updating the designer. Click here to reload. If you click the message as indicated, the form disappears from the Design View window and is replaced with the following message:
Don t panic; you will now x your mistake! 6. In the XAML pane, modify the Key property and change the TargetType to Control in the de nition of the style, and then modify the references to the style in the button and text box controls as shown in bold type here:
<Window x:Class= BellRingers.Window1 ...> <Window.Resources> <Style x:Key= bellRingersStyle TargetType= Control > <Setter Property= Background Value= Gray /> <Setter Property= Foreground Value= White /> <Setter Property= FontFamily Value= Comic Sans MS /> </Style> </Window.Resources> <Grid> <Button Style= {StaticResource bellRingersStyle} ...> Button </Button> <Button Style= {StaticResource bellRingersStyle} ...> Button </Button> ... <TextBox ... Style= {StaticResource bellRingersStyle} ... /> </Grid> </Window>
Because the style no longer applies exclusively to buttons, it makes sense to rename it. Setting the TargetType attribute of a style to Control speci es that the style can be applied to any control that inherits from the Control class. In the WPF model, many different types of controls, including text boxes and buttons, inherit from the Control class. However, you can provide Setter elements only for properties that explicitly belong
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