c# reading barcode from image B: Introduction to XAML in Visual C#.NET

Printer Code 3/9 in Visual C#.NET B: Introduction to XAML

Appendix B: Introduction to XAML
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Figure B-2
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A Button with its Content attribute set as Text
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In Listing B-2, you can see that the Window has a contained Button element whose Content attribute contains text Figure B-2 shows what this looks like when running A powerful feature of XAML is property elements that allow you to add sophisticated markup that will be assigned to a class property In the case of the Button, we ll enhance the Content property as a property element in XAML to show how to add content other than text The following markup is the Button from Listing B-2, enhanced to hold an image instead of text For readability, I added a line break for the value of the Source attribute:
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<Button> <ButtonContent> <Image Source= "C:\Users\Public\Pictures\Sample Pictures\Penguinsjpg" /> </ButtonContent> </Button>
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Instead of setting the Content attribute, the preceding example uses property element syntax, where the child element is named <parentElementNameattributeName> The benefit of property element syntax shown in the preceding code is that the Content property will now be set to an image With attribute syntax, you were limited to text, but with property element syntax, you can put anything in a button Of course, instead of what I did with the image, you would want to use common sense and only add content that is meaningful for the application Figure B-3 shows the new button with the image
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Microsoft Visual Studio 2010: A Beginner s Guide
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Figure B-3
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Button with Content property element set to Image
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VS provides XAML editor support by allowing you to place your cursor between begin and end tags, pressing ENTER, and indenting the start position of the cursor on the new line between the start and end tags From that point, you can type < and begin working with Intellisense to select the element and attribute you need to implement with property element syntax
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Markup Extensions
Another extensibility point in XAML is markup extensions, which allow you to set an attribute to reference another value Common uses of markup extensions include data binding and resource usage Data binding is the practice of associating data with a user interface control For example, if you needed to show a customer record on the screen, you would bind each property of the customer object to parts of the screen, such as binding a customer name to a TextBox on the screen You ll see examples of data binding in the WPF and Silverlight chapters of this book, s 8 and 10 Right now, it s important to concentrate on what a markup extension is, and you ll see an example that applies a resource to an element A resource is some type of object or value that can be used by multiple controls For example, you can define a special color for buttons on your screen in one place and then use a markup extension to point all of these buttons to the same resource That way, you can change the color resource in one place and all buttons referring to that color resource
Appendix B: Introduction to XAML
will change automatically Listing B-3 defines a brush resource of a specific color and shows how to reference that brush from multiple buttons using a markup extension
Listing B-3 Markup extension for using resources
<Window x:Class="WpfApplication1MainWindow" xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <WindowResources> <SolidColorBrush x:Key="ButtonBrush" Color="Yellow" /> </WindowResources> <StackPanel> <Button Background="{StaticResource ResourceKey=ButtonBrush}" Content="Button One" /> <Button Background="{StaticResource ResourceKey=ButtonBrush}" Content="Button Two" /> </StackPanel> </Window>
The WindowResources element in Listing B-3 is a property element of Window It contains a SolidColorBrush with Color set to Yellow Everything in WPF and Silverlight is drawn with brushes, which define colors, gradients, images, media, or patterns In this case, we ll keep it simple with a single color, which is what SolidColorBrush is good for The point here is not what a brush is, but the fact that the brush is a resource that will help demonstrate how to use a markup extension to access that resource It s important to assign a key to every resource because that key is what resource markup extensions use to identify the resource You can see the markup extension assigned to the Background attributes of the Button elements in Listing B-3 Markup extensions are surrounded by curly braces Within the curly braces are the extension type and attributes associated with the extension In Listing B-3, the extension type is StaticResource, which allows you to refer to a resource The ResourceKey attribute of the StaticResource extension specifies the particular resource to use The value, ButtonBrush, matches the key of the SolidColorBrush resource So, the value of the BackGround attribute of the Button elements is a StaticResource for a SolidColorBrush that has its color set to Yellow This effectively means that the Buttons will have Yellow backgrounds To see the value of using resources, consider the situation you would be in if you set the BackGround attribute of each button directly to Yellow instead of using the
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