Thursday, 6 June 2013

Example ComboBox of Data Binding in WPF

Posted by Rahul Kharde at 22:20
Data bindings is to separate the GUI from the data. In the case of WPF, properties are the ideal interface between GUI and objects. Each time a property is changed, an event will be raised, and the GUI gets notified about it. There is no need to connect it, as this works via reflection, the only code you have to write is the notification that a property has been changed.

The ComboBox element represents a ComboBox control in XAML.  

The Width and Height properties represent the width and the height of a ComboBox.  The x:Name property represents the name of the control, which is a unique identifier of a control. The Margin property sets the location of a ComboBox on the parent control. The HorizontalAlignment and VerticalAlignment properties are used to set horizontal and vertical alignments.


Below example contain three controls TextBox, TextBlock and ComboBox.  When the user types any text inside the textbox, the text is automatically displayed in the TextBlock control, because the TextBlock control is data bound to the textbox control.There is minimal effort to data-bind the two controls together, with the textbox control being the data source. Similarly Combobox of size and color are work they automatically change it color and size when user are select comboBox item.

        <Grid Width="300">
                <RowDefinition Height="25"></RowDefinition>
                <RowDefinition Height="25"></RowDefinition>
                <RowDefinition Height="25"></RowDefinition>
                <RowDefinition Height="200"></RowDefinition>

                <ColumnDefinition Width="100"></ColumnDefinition>

            <TextBlock Height="20" Text="Text:" TextWrapping="Wrap" Grid.Row="0" Grid.Column="0"/>
            <TextBlock Height="20" Text="Color:" TextWrapping="Wrap" Grid.Row="1" Grid.Column="0"/>
            <TextBlock Height="20" Text="Size:" TextWrapping="Wrap" Grid.Row="2" Grid.Column="0"/>

            <TextBox x:Name="txt" Grid.Column="1" Height="20" Width="194"></TextBox>

            <ComboBox x:Name="CmbColor"
                 VerticalAlignment="Top" Width="194" Height="20" Grid.Row="1" Grid.Column="1">
                <ComboBoxItem Content="Red"></ComboBoxItem>
                <ComboBoxItem Content="Green"></ComboBoxItem>
                <ComboBoxItem Content="Orange"></ComboBoxItem>
                <ComboBoxItem Content="Blue"></ComboBoxItem>
                <ComboBoxItem Content="pink"></ComboBoxItem>
                <ComboBoxItem Content="Gray"></ComboBoxItem>

            <ComboBox x:Name="Cmbsize"
                 VerticalAlignment="Top" Width="194" Height="20" Grid.Row="2" Grid.Column="1">            
                <ComboBoxItem Content="22"></ComboBoxItem>
                <ComboBoxItem Content="24"></ComboBoxItem>
                <ComboBoxItem Content="26"></ComboBoxItem>
                <ComboBoxItem Content="28"></ComboBoxItem>
                <ComboBoxItem Content="30"></ComboBoxItem>
                <ComboBoxItem Content="32"></ComboBoxItem>
                <ComboBoxItem Content="34"></ComboBoxItem>
                <ComboBoxItem Content="36"></ComboBoxItem>
                <ComboBoxItem Content="38"></ComboBoxItem>
                <ComboBoxItem Content="40"></ComboBoxItem>

            <TextBlock  Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2">
                    <Binding ElementName="txt" Path="Text"/>                   
                    <Binding ElementName="CmbColor" Path="SelectedItem.Content"/>                   
                    <Binding ElementName="Cmbsize" Path="SelectedItem.Content"/>

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