VB.net WPF textblock

Question

can you please help me.

Im new in WPF and trying absolutely simple code. Have form with open save dialog. Path to a file im fill to a textblock and this string i need use in other module.

Without WPF i know how i can use it

frm_main.txt_path.text

But i cannot find this in WPF. This is my form. And i need use txt_path textblock

<Window x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SCM_TO_BIESSE"
        mc:Ignorable="d"
        Title="Conversion SCM XXL code to Biesse XNC" Height="413.059" Width="647.202">
    <Grid x:Name="frm_main" Margin="1,1,1,1.2">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0*"/>
            <ColumnDefinition Width="194*"/>
            <ColumnDefinition Width="445*"/>
        </Grid.ColumnDefinitions>
        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="Black" Offset="0"/>
                <GradientStop Color="#FF4396E4" Offset="1"/>
            </LinearGradientBrush>
        </Grid.Background>
        <TextBlock x:Name="txt_path" HorizontalAlignment="Left" Margin="68,196,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="48" Width="285" Grid.ColumnSpan="3" Foreground="#FF6B5050">
            <TextBlock.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF897F7F" Offset="0"/>
                    <GradientStop Color="#FFFAFAFA" Offset="1"/>
                </LinearGradientBrush>
            </TextBlock.Background>
        </TextBlock>
        <Button x:Name="btn_open" Content="Select file for conversion" HorizontalAlignment="Left" Margin="211.4,196,0,0" VerticalAlignment="Top" Width="160" Height="48" Grid.Column="2" RenderTransformOrigin="0.377,-0.663"/>
        <Image Grid.Column="1" Margin="1,1,317.4,295" Source="new.jpg" Stretch="Fill" Grid.ColumnSpan="2"/>
        <Button x:Name="btn_open_Copy" Content="Start Conversion" HorizontalAlignment="Left" Margin="65.4,304,0,29" Width="160" Grid.Column="2" RenderTransformOrigin="0.377,-0.663"/>

    </Grid>
</Window>

Thanks very much for a help .

Marek

Answer 1

WPF is predicated (based, built) on binding to achieve a separation of concerns. You can do things the same way as WinForms but it isn't advised.

First (as mentioned in a comment) you need to use a TextBox , not a TextBlock. You haven't bound your TextBox to an underlying property (note that I've simplified this):

    <TextBox x:Name="txt_path" 
             Text="{Binding YourTextProperty}"  
             Height="48" Width="285" 
             >

    </TextBox>

</Grid>

You then have a public get/set string property called YourTextProperty on your viewmodel - then anything populated in to that TextBox will get automatically propagated to the underlying property (and vice versa - if you've correctly implemented INPC then any value populated into the property will get reflected in the textbox).