barcode label printing in vb.net Set the FontSize Property in Font

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Set the FontSize Property
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Of course, you could have just done it all in the markup, as shown in the following lines, but then the relationships wouldn t have been as clear. The following markup does the same thing, with no changes to the default code-behind supplied by Visual Studio. <StackPanel> <Label Name="displayText" Margin="5" FontSize="{Binding ElementName=sourceInfo, Path=Text}" Content="{Binding ElementName=sourceInfo, Path=Text }"/> <TextBox Name="sourceInfo">10</TextBox> </StackPanel>
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CHAPTER 8 DATA BINDING
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Deleting Bindings
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Using the ClearBinding or ClearAllBindings method, you can delete a single binding on a target, or you can delete them all. These are static methods on the BindingOperations class. Figure 8-15 illustrates the effects of these commands.
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Figure 8-15. Use the ClearBinding method to remove a specific binding from a target object. Use the ClearAllBindings method to remove all the bindings from a target object. The code on the following page implements a program that allows you to exercise these options to either clear the FontFamily binding or clear both bindings. Figure 8-16 shows the program s window.
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Figure 8-16. The Clear Bindings program
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CHAPTER 8 DATA BINDING
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The markup for the program is the following: <Window x:Class="ClearBindings.Window1" ... Title="Clear Bindings" Height="152" Width="260"> <StackPanel> <Label Name="displayText" Margin="5" FontSize="16" Content="My Text" FontFamily="{Binding ElementName=fontBox, Path=Text}" FontWeight="{Binding ElementName=weightBox, Path=Text}"/> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions> <StackPanel> <ComboBox Name="fontBox" SelectedIndex="0" Margin="5,0,5,2"> <ComboBoxItem>Arial</ComboBoxItem> <ComboBoxItem>Courier New</ComboBoxItem> </ComboBox> <ComboBox Name="weightBox" SelectedIndex="0" Margin="5,0,5,2"> <ComboBoxItem>Normal</ComboBoxItem> <ComboBoxItem>Bold</ComboBoxItem> </ComboBox> </StackPanel> <StackPanel Grid.Column="1"> <Button Name="ClearFont" Margin="5,0,5,2" Click="ClearFont_Click">Clear Font</Button> <Button Name="ClearAll" Margin="5,0,5,2" Click="ClearAll_Click">Clear All</Button> <Button Name="CreateBindings" Margin="5,0,5,2" Click="CreateBindings_Click">Create Bindings</Button> </StackPanel> </Grid> </StackPanel> </Window>
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CHAPTER 8 DATA BINDING
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The source for the code-behind is the following. It consists, essentially, of event handlers for the three buttons. The first handler clears the binding for just the FontFamily property. The second handler clears all the bindings associated with the displayText Label. The third handler creates the bindings again.
public partial class Window1 : Window { public Window1() { InitializeComponent(); } // Clear the FontFamily binding. private void ClearFont_Click( object sender, RoutedEventArgs e ) { BindingOperations.ClearBinding( displayText, FontFamilyProperty ); } // Clear all the bindings. private void ClearAll_Click( object sender, RoutedEventArgs e ) { BindingOperations.ClearAllBindings( displayText ); } // Re-create the two bindings. private void CreateBindings_Click( object sender, RoutedEventArgs e ) { // Create the FontFamily binding. Binding fontBinding = new Binding(); fontBinding.Source = fontBox; fontBinding.Path = new PropertyPath( "Text" ); fontBinding.Mode = BindingMode.OneWay; displayText.SetBinding( FontFamilyProperty, fontBinding ); // Create the FontWeight binding. Binding weightBinding = new Binding(); weightBinding.Source = weightBox; weightBinding.Path = new PropertyPath( "Text" ); weightBinding.Mode = BindingMode.OneWay; displayText.SetBinding( FontWeightProperty, weightBinding ); } }
CHAPTER 8 DATA BINDING
Binding to Nonelements
So far, all the source items for which you ve created bindings have been WPF elements that derive from UIElement. But the source object can be any type of object. In this section, I ll show how to create a simple class and bind to several of its properties. Remember, however, that although the source object can be of any type, the Path must always point to a public property. Start by defining a simple class called Person, as shown in the following code. This is in a file called Person.cs. The class consists of a constructor and three public properties, containing the first name, age, and favorite color of a person. class Person { public string FirstName { get; set; } public int Age { get; set; } public string FavoriteColor { get; set; } public Person( string fName, int age, string color ) { FirstName = fName; Age = age; FavoriteColor = color; } } The markup is quite simple and consists of three Labels, each of which contains one of the pieces of data about a person. <StackPanel Orientation="Horizontal"> <Label Name="lblFName" FontWeight="Bold"/> <Label Name="lblAge/> <Label Name="lblColor"/> </StackPanel>
CHAPTER 8 DATA BINDING
The code-behind of the Window1 class is shown next. Notice the following about the code: The code creates a single Person object, which will be the source of the bindings. It then creates the bindings that connect each of the three properties in the Person object to a Label. The Binding constructor used here takes a single parameter, which sets the Binding object s Path property. Previously in the code samples, I ve used the Binding constructor with no parameters and then set the Path explicitly. This just saves a line of code per Binding.
public Window1() { InitializeComponent(); Person p = new Person( "Shirley", 34, "Green" ); Create Person Object Binding Constructor with Path Parameter
Binding nameBinding = new Binding( "FirstName" ); nameBinding.Source = p; lblFName.SetBinding( ContentProperty, nameBinding ); Binding ageBinding = new Binding( "Age" ); ageBinding.Source = p; lblAgeSetBinding( ContentProperty, ageBinding ); Binding colorBinding = new Binding( "FavoriteColor" ); colorBinding.Source = p; lblColor.SetBinding( ContentProperty, colorBinding ); } When this code is run, it produces the window shown in Figure 8-17.
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