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With WPF and MVVM, properties of the ViewModel are bound to UI elements. When a property changes, its set accessor calls OnPropertyChanged which in turn raises the PropertyChanged event of the INotifyProptyChanged interface.
But it is possible to call OnPropertyChanged (with the property name as argument) from anywhere in the ViewModel (and then you can't use the CallerMemberName attribute).
Now I'd like to ask you: how do you handle such cases? Do you call OnPropertyChanged from other places than the property_set? Or do you change your code such that you call the property_set? Or other ideas?
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You can call it from anywhere; it's purpose is to notify the "UI" that there is new info in the data source and the "display" needs updating.
The point is, you may have an updated data source but that does NOT imply that the UI has to also be updated at that point ... maybe the update should be deferred (for now).
For example, I have a real-time app that displays many "numbers" that are calculated; some fields on the display are based on other numbers being displayed. There is no point doing "UI updates" for each calculation ... I do all my calcs, then I call OnPropertyChanged at the end of my calc routine.
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Hi all,
This is my very first WPf-project, so please have some consideration and don’t advise me on MVVM .
Everything I in my project is working fine except one thing:
Whenever I hit the enter key on my keyboard a button gets the click event.
This button is not default button and the only event registered with this button is the click-event.
This is driving me insane.
If I put a breakpoint in the click event handler the routedEventsArgs e is button base click.
Here is the code related to this problem:
<Style x:Key="ButtonStyle" TargetType="Button">
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="Foreground" Value="White" />
<Setter Property="IsEnabled" Value="True" />
<Setter Property="Width" Value="Auto" />
<Setter Property="Height" Value="Auto" />
<Setter Property="Margin" Value="14,5,0,5" />
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
<GradientStop Offset="0" Color="Black" />
<GradientStop Offset="1" Color="#FFC41B1B" />
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid Background="{TemplateBinding Background}">
<ContentPresenter x:Name="MyContentPresenter"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Content="{TemplateBinding Content}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#7d7f74" />
<Setter Property="Background" Value="#31302c" />
</Trigger>
<Trigger Property="IsKeyboardFocused" Value="true">
<Setter Property="Foreground" Value="Goldenrod" />
</Trigger>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Foreground" Value="Goldenrod" />
</Trigger>
</Style.Triggers>
</Style>
<Style x:Key="ButtonTextBlock" TargetType="TextBlock">
<Setter Property="Foreground" Value="White" />
<Setter Property="FontFamily" Value="Trebuchet" />
<Setter Property="FontSize" Value="14" />
<Setter Property="Foreground" Value="White" />
<Setter Property="Background" Value="#000000FF" />
<Setter Property="TextAlignment" Value="Center" />
<Setter Property="Width" Value="95" />
<Setter Property="Padding" Value="5" />
<Setter Property="Margin" Value="0,8,0,8" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Foreground" Value="Goldenrod" />
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#7d7f74" />
<Setter Property="Background" Value="#31302c" />
</Trigger>
</Style.Triggers>
</Style>
<Style x:Key="TextBoxTextBlock" TargetType="TextBlock">
<Setter Property="Foreground" Value="White" />
<Setter Property="FontFamily" Value="Trebuchet" />
<Setter Property="FontSize" Value="14" />
<Setter Property="Foreground" Value="White" />
<Setter Property="Background" Value="#000000FF" />
<Setter Property="TextAlignment" Value="Center" />
<Setter Property="Width" Value="80" />
<Setter Property="Padding" Value="5" />
<Setter Property="Margin" Value="0,8,0,8" />
<Setter Property="Height" Value="Auto" />
<Style.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#7d7f74" />
<Setter Property="Background" Value="#31302c" />
</Trigger>
</Style.Triggers>
</Style>
And:
<Button x:Name="buttonReset"
Click="buttonReset_Click"
Style="{StaticResource ButtonStyle}">
<TextBlock Style="{StaticResource ButtonTextBlock}">
<Run Text="Reset" />
<LineBreak /><Run Text="alles" />
</TextBlock>
</Button>
code behind:
private void buttonReset_Click(object sender, RoutedEventArgs e)
{
if (!buttonReset.IsKeyboardFocused) return;
ResetAll();
buttonNwOpdrNr.IsEnabled = true;
buttonZoeken.IsEnabled = true;
}
What can cause this behavior ?
Thanks in advance,
Groover
0200 A9 23
0202 8D 01 80
0205 00
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If your button has the focus then enter will invoke the click event.
If all other controls are read only then your button may automatically get the focus.
Never underestimate the power of human stupidity
RAH
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Thank You for Your reply, now it is obvious that the button automatically gets focus, but I could not see difference in appearance of the button. I'll fix that.
How can I prevent any control to get keyboard focus other than with the TAB-key or mouse-click?
It is a disaster when my application gets a reset when the ENTER-key is accidentally hit.
0200 A9 23
0202 8D 01 80
0205 00
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Take a look into the FocusManager, this is my primary grid declaration.
<Grid Style="{StaticResource InfoGrid}"
FocusManager.FocusedElement="{Binding ElementName=txtAuthoriser}">
Never underestimate the power of human stupidity
RAH
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I created a grid based XAML page. In the grid I display images which require no negative top margin, vertical, values. In my page I have two labels in textblocks that will not align properly in their grid stack panel with out using negative top margin values in the textblocks. The first label textblock I have to use a Margin="0,-35,0,0" and the second I have to use Margin="0, -650, 0, 0. The XAML is below. One final thing. After what you see I need a table to display labels in several rows and columns. Each row might have different width columns. In my design what is recommended for that?
<Window
x:Class="MasterPage.ApplicationInfoWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:MasterPage"
Title="Intake 4" Height="900" Width="1000" Background="#FFD9DDE8">
<DockPanel>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
</Grid>
<StackPanel >
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<StackPanel Height="133" VerticalAlignment="Top" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2">
<StackPanel>
<Image Source="Images\header.jpg" Stretch="Fill" DockPanel.Dock="Top" Height="47" />
</StackPanel>
<StackPanel Margin="3,0,0,5" HorizontalAlignment="Left">
<Image Source="Images\DSPASS_logo.png" Width="324" Stretch="Fill" DockPanel.Dock="Top" Height="80" />
</StackPanel>
<StackPanel DockPanel.Dock="Top" HorizontalAlignment="Right" >
<TextBlock FontSize="15" TextWrapping="WrapWithOverflow" Height="25" Margin="0,-35,0,0" >
<Label FontSize="10" HorizontalContentAlignment="Right" HorizontalAlignment="Right" Name="Namelabel" Width="230" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</TextBlock>
</StackPanel>
</StackPanel>
</Border>
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<StackPanel Background="wHITE" Height="358" VerticalAlignment="Top" Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="1">
<StackPanel>
<Image Source="Images\silhouette.jpg" VerticalAlignment="Top" HorizontalAlignment="Left" Width="320" Stretch="Fill" DockPanel.Dock="Top" Height="360" />
</StackPanel>
<StackPanel VerticalAlignment="Top" >
<TextBlock FontSize="15" HorizontalAlignment="Right" Height="75" Margin="0, -650, 0, 0" TextWrapping="WrapWithOverflow" >
<Label FontSize="35" HorizontalContentAlignment="Left" Name="Namelabel2" Width="640" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</TextBlock>
</StackPanel>
</StackPanel>
</Border>
</StackPanel>
</DockPanel>
</Window>
modified 23-Jul-16 8:09am.
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<Window
x:Class="MasterPage.ApplicationInfoWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:MasterPage"
Title="Intake 4" Height="900" Width="1000" Background="#FFD9DDE8">
<DockPanel>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
</Grid>
<StackPanel >
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<StackPanel Height="133" VerticalAlignment="Top" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2">
<StackPanel>
<Image Source="Images\header.jpg" Stretch="Fill" DockPanel.Dock="Top" Height="47" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<StackPanel Margin="3,0,0,5" HorizontalAlignment="Left">
<Image Source="Images\DSPASS_logo.png" Width="324" Stretch="Fill" DockPanel.Dock="Top" Height="80" />
</StackPanel>
<StackPanel HorizontalAlignment="Right" Margin="400, 0, 0, 0" >
<TextBlock FontSize="15" TextWrapping="WrapWithOverflow" Height="25" Margin="0,60,0,0" >
<Label FontSize="10" HorizontalContentAlignment="Right" HorizontalAlignment="Right" Name="Namelabel" Width="230" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</TextBlock>
</StackPanel>
</StackPanel>
</StackPanel>
</Border>
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<StackPanel Background="wHITE" Orientation="Horizontal" Height="358" VerticalAlignment="Top" Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="1">
<StackPanel>
<Image Source="Images\silhouette.jpg" VerticalAlignment="Top" HorizontalAlignment="Left" Width="320" Stretch="Fill" DockPanel.Dock="Top" Height="360" />
</StackPanel>
<StackPanel>
<TextBlock FontSize="15" HorizontalAlignment="Right" Height="75">
<Label FontSize="35" HorizontalContentAlignment="Left" Name="Namelabel2" Width="640" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</TextBlock>
</StackPanel>
</StackPanel>
</Border>
</StackPanel>
</DockPanel>
</Window>
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<Window
x:Class="MasterPage.ApplicationInfoWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:MasterPage"
Title="Intake 4" Height="900" Width="1000" Background="#FFD9DDE8">
<StackPanel>
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<StackPanel Height="133" VerticalAlignment="Top">
<Image Source="Images\header.jpg" Stretch="Fill" Height="47" />
<DockPanel Margin="3,0,0,5">
<Image DockPanel.Dock="Left" Source="Images\DSPASS_logo.png" Width="324" Stretch="Fill" Height="80" />
<Label DockPanel.Dock="Right" FontSize="10" HorizontalContentAlignment="Right" HorizontalAlignment="Right" VerticalAlignment="Bottom" Name="Namelabel" Width="230" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</DockPanel>
</StackPanel>
</Border>
<Border Margin="0, 0, 0, 0" BorderBrush="Black" BorderThickness="1">
<DockPanel Background="White" Height="358" VerticalAlignment="Top">
<Image DockPanel.Dock="Left" Source="Images\silhouette.jpg" VerticalAlignment="Top" HorizontalAlignment="Left" Width="320" Stretch="Fill" Height="360" />
<Label DockPanel.Dock="Right" FontSize="35" HorizontalContentAlignment="Left" Name="Namelabel2" Width="640" FontWeight="Bold" Foreground="#1664A1" Content="Name"/>
</DockPanel>
</Border>
</StackPanel>
</Window>
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I'm creating a List type of control[^].
The ListBox's DataTemplate will be an Expander.
Each Expander will have UserControls added to it from the code behind at runtime. How do I ensure that the control is added to the correct Expander?
Thanks
If it's not broken, fix it until it is
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Track each Expander's control reference.
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I have a XAML window that the layout is done using a main grid. The problem is when the browser is resized the controls in the second and third columns move to the right and the window's layout is no longer correct. I have pasted the XAML below. I think the layout of a WPF window should be grid based with all controls residing in the window's master grid. Is this the proper layout design for WPF or is there a different recommended layout pattern? Also, I find myself having to use negative value in margins. This confuses me greatly as well.
<Window x:Class="MasterPage.Intake1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:MasterPage.View"
Title="Intake 1" Height="900" Width="1000" Background="#FFD9DDE8" >
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="35*"/>
<RowDefinition Height="45*"/>
<RowDefinition Height="190*"/>
<RowDefinition Height="275*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="500*"/>
<ColumnDefinition Width="300*"/>
<ColumnDefinition Width="250*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="0" Grid.ColumnSpan="3" Grid.Row="0">
<Image Source="Images\header.jpg" Height="47" Margin="0,0,0,0" />
</StackPanel>
<StackPanel HorizontalAlignment="Left" Grid.Column="0" Height="80" Width="350" Grid.ColumnSpan="1" Grid.Row="1" Margin="0,-23,0,0">
<Image Source="Images\DSPASS_logo.png" Stretch="Fill" DockPanel.Dock="Top" Height="70" />
</StackPanel>
<StackPanel Grid.Column="4" Grid.Row="1" Grid.ColumnSpan="1" Margin="0,0,0,0">
<TextBlock FontSize="15" Margin="0,0,0,0" Height="25" Width="300" TextWrapping="WrapWithOverflow">
<Label FontSize="10" Name="Namelabel" Width="250" FontWeight="Bold" Foreground="#1664A1" Content="Welcome to DS PASS:"/>
</TextBlock>
</StackPanel>
<StackPanel Grid.Column="0" Grid.Row="2" HorizontalAlignment="Left" Margin="10,10,0,0" Height="290" Width="975" VerticalAlignment="Top" Grid.ColumnSpan="3" Grid.RowSpan="1">
<Label Height="36" FontSize="16" Content="Post Identification" Background="#FF014E7E" FontWeight="Bold" Foreground="White" Margin="-5,0,-18,0"/>
<StackPanel x:Name="_wordLength" Orientation="Horizontal" Margin="235,0,200,0">
<TextBlock Height="20" x:Name="ApplicantType_TextBlock" Text="Applicant Type" Width="110" Margin="5" TextAlignment="Right"/>
<ComboBox Height="25" x:Name="textBoxWordLength" Width="400" Margin="10,5"/>
</StackPanel>
<StackPanel x:Name="_integerWordLength" Orientation="Horizontal" Margin="235,0,200,0">
<TextBlock Height="20" x:Name="textBlockIntegerWordLength" Text="Person Type" Width="110" Margin="5" TextAlignment="Right"/>
<ComboBox Height="25" x:Name="textBoxIntegerWordLength" Width="400" Margin="10,5"/>
</StackPanel>
<StackPanel x:Name="_Post" Orientation="Horizontal" Margin="235,0,200,20">
<TextBlock Height="20" x:Name="Post_TextBlock" Text="Post" Width="110" Margin="5" TextAlignment="Right"/>
<ComboBox Height="25" x:Name="Post_TextBox" Width="400" Margin="10,5"/>
</StackPanel>
</StackPanel>
<StackPanel Grid.Column="0" Grid.Row="3" HorizontalAlignment="Left" Height="130" Margin="15,-120,0,0" VerticalAlignment="Top" Grid.ColumnSpan="3" >
<Label Height="36" FontSize="16" Content="Applicant Employment" Background="#FF004A78" FontWeight="Bold" Foreground="White" Margin="-5,0,-18,0"/>
<StackPanel x:Name="_max1" Orientation="Vertical" Margin="1,0,355,0">
<TextBlock Height="20" x:Name="maxTextBlock1" Text="Employee ID" Width="100" Foreground="Black" Margin="0,15,459,5" TextAlignment="Right"/>
<TextBox Height="25" x:Name="maxTextBox1" Width="400" Margin="0,-5,90,25"/>
</StackPanel>
</StackPanel>
<StackPanel Grid.Column="0" Grid.Row="4" Grid.ColumnSpan="3" Orientation="Vertical" HorizontalAlignment="Left" Height="330" Margin="0,10,0,0" VerticalAlignment="Top" Width="965" Grid.RowSpan="2">
<Label Height="36" FontSize="16" Content="English Version of Name" Background="#FF005183" Grid.Row="4" FontWeight="Bold" Margin="10,10,0,0" Foreground="White" Padding="4,5,5,5"/>
<StackPanel x:Name="_LastName" Orientation="Vertical">
<TextBlock Height="20" x:Name="LastName_TextBlock" Text="Last Name/Surname" Margin="55,5,459,5" TextAlignment="Left"/>
<TextBox Height="25" x:Name="LastName_TextBox" Width="500" Margin="55,5,459,5"/>
</StackPanel>
<StackPanel x:Name="_FirstName" Orientation="Vertical">
<TextBlock Height="20" x:Name="FirstName_TextBlock" Text="First Name" Margin="55,0,459,0" TextAlignment="Left"/>
<TextBox Height="25" x:Name="FirstName_TextBox" Width="500" Margin="55,0,459,0"/>
</StackPanel>
<StackPanel x:Name="_MiddleName" Orientation="Vertical">
<TextBlock Height="20" x:Name="MiddleName_TextBlock" Text="Middle Name" Margin="55,5,459,5" TextAlignment="Left"/>
<TextBox Height="25" x:Name="MiddleName_TextBox" Width="500" Margin="55,5,459,5"/>
</StackPanel>
<StackPanel x:Name="_ExtendedName" Orientation="Vertical">
<TextBlock Height="20" x:Name="ExtendedName_TextBlock" Text="Extended name (Tribal, Jr., III, etc.)" Margin="55,5,372,5" TextAlignment="Left"/>
<TextBox Height="25" x:Name="Extended_TextBox" Width="500" Margin="55,5,459,5"/>
</StackPanel>
</StackPanel>
<StackPanel Grid.RowSpan="4" Grid.Column="4" HorizontalAlignment="Left" Height="230" Margin="-250,400,0,0" Width="480" Grid.ColumnSpan="1">
<StackPanel x:Name="_Aliases" Orientation="Vertical" Margin="-15,0,0,0" Height="144">
<TextBlock Height="20" x:Name="Aliases_TextBlock" Text="Aliases" Margin="40,-5,0,5" TextAlignment="Left"/>
<TextBox Height="25" x:Name="Aliases_TextBox" Width="500" Margin="43,5"/>
<TextBox Height="25" x:Name="Aliases_TextBox1" Width="500" Margin="43,5"/>
<TextBox Height="25" x:Name="Aliases_TextBox2" Width="500" Margin="43,5"/>
</StackPanel>
</StackPanel>
<Label HorizontalAlignment="Left" Margin="4,400,0,0" Grid.Row="4" VerticalAlignment="Top" Background="#FF52BB52" Grid.ColumnSpan="3" Width="983" Height="36">
</Label>
<Button Content="Save Draft" Grid.Column="1" HorizontalAlignment="Left" Margin="150,408,0,0" Grid.Row="5" VerticalAlignment="Top" Width="125" />
<Button x:Name="ContinueButton_Page2" Content="Continue" Grid.Column="1" Width="125" Grid.Row="5" VerticalAlignment="Top" Margin="200,408,0,0" Grid.ColumnSpan="2" Click="btnContinue_Click"/>
</Grid>
</Window>
modified 17-Jul-16 10:51am.
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WPF works for you when your "view" is laid out in a logical manner; yours is not; it is particularly obvious if you look at your XAML in the "document outline" and "design" windows.
StackPanels are hard to control; it's easier / more intuitive using "Grids within Grids".
You should not be altering "heights" and "margins" (from their defaults) to affect positioning; the "styles" (i.e. height, width, etc.) of the individual controls should drive the (automatic) layout.
Start by removing the height and width of the window and look at the properties that relate to its content; e.g. StartupLocation; SizeToContent; WindowState; etc.
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So, I basically took the reordering from Josh Smith:
Drag and Drop Items in a WPF ListView[^]
All I wanted to do now was to draw a line where the new item was inserted, with an arrow. Like the old WinForms style behavior:
Manual reordering of items inside a ListView[^]
The line under was easy to achieve, all I had to was to alter the Style:
<Style x:Key="ItemContStyle" TargetType="ListViewItem">
<Style.Resources>
<LinearGradientBrush x:Key="MouseOverBrush" StartPoint="0.5, 0" EndPoint="0.5, 1">
<GradientStop Color="#22000000" Offset="0" />
<GradientStop Color="#44000000" Offset="0.4" />
<GradientStop Color="#55000000" Offset="0.6" />
<GradientStop Color="#33000000" Offset="0.9" />
<GradientStop Color="#22000000" Offset="1" />
</LinearGradientBrush>
<SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />
<SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
</Style.Resources>
<Setter Property="Padding" Value="0,4" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<!--
<Setter Property="Border.BorderThickness" Value="0,0,0,0.5" />
<Setter Property="Border.BorderBrush" Value="Transparent"/>
<!--
<Style.Triggers>
<Trigger Property="jas:ListViewItemDragState.IsBeingDragged" Value="True">
<Setter Property="FontWeight" Value="DemiBold" />
</Trigger>
<Trigger Property="jas:ListViewItemDragState.IsUnderDragCursor" Value="True">
<Setter Property="Border.BorderThickness" Value="0,0,0,0.5" />
<Setter Property="Border.BorderBrush" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
SO I looked at the ControlTemplate for the ListViewItems:
ListViewItem ControlTemplate Example[^]
But as soon as I started to add the ControlTemplate Design the correct behavior stopped:
<Style x:Key="ItemContStyle" TargetType="ListViewItem">
<Style.Resources>
<LinearGradientBrush x:Key="MouseOverBrush" StartPoint="0.5, 0" EndPoint="0.5, 1">
<GradientStop Color="#22000000" Offset="0" />
<GradientStop Color="#44000000" Offset="0.4" />
<GradientStop Color="#55000000" Offset="0.6" />
<GradientStop Color="#33000000" Offset="0.9" />
<GradientStop Color="#22000000" Offset="1" />
</LinearGradientBrush>
<SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />
<SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
</Style.Resources>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Grid>
<Polygon
x:Name="poly_PART"
VerticalAlignment="Bottom"
HorizontalAlignment="Left"
Stroke="Red"
Fill="Red"
StrokeThickness="2"
Points="0,1 0,-1 1,0"
Margin="0,0,0,0"
Width="10"
Height="10"
Stretch="Fill"
/>
<ContentPresenter
Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Padding" Value="0,4" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<!--
<Setter Property="Border.BorderThickness" Value="0,0,0,0.5" />
<Setter Property="Border.BorderBrush" Value="Transparent"/>
<!--
<Style.Triggers>
<Trigger Property="jas:ListViewItemDragState.IsBeingDragged" Value="True">
<Setter Property="FontWeight" Value="DemiBold" />
</Trigger>
<Trigger Property="jas:ListViewItemDragState.IsUnderDragCursor" Value="True">
<!--
<Setter Property="Border.BorderThickness" Value="0,0,0,0.5" />
<Setter Property="Border.BorderBrush" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
How do I fix this issue?
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Here is a common way of having a ViewModel's property with the INotifyPropertyChanged interface:
string text;
public string Text
{
get { return text; }
set
{
if (value != text)
{
text = value;
NotifyPropertyChanged(nameof(Text));
}
}
}
This occupies one line for the member variable and twelve lines for the property.
In my ViewModel I have many properties and the code is getting very huge due to each property need the above body to include the NotifyPropertyChanged method and a member varible.
I prefer my properties to be defined in this way:
public string Text { get; set; }
That property's body is just one line and I don't need to define a member variable.
But I cannot find out how to call the NotifyPropertyChanged method.
Is there a solution to short the body of the property and still have the call to the NotifyPropertyChanged method?
For instance:
* Having a property without the need of a member variable.
* Define the property as close as possible to: public string Text { get; set; }.
* Having the call to the NotifyPropertyChanged in the setter body.
Best regards,
/Steffe
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Mc_Topaz wrote: Is there a solution to short the body of the property and still have the call to the NotifyPropertyChanged method?
No.
Never underestimate the power of human stupidity
RAH
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No.
However you can make your declaration easier by using Code Snippets[^].
Here is my MVVM property snippet
="1.0"="utf-8"
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
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<Author>Lloyd</Author>
<Description>INotifyPropertChanged property</Description>
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<Shortcut>propn</Shortcut>
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<ID>Type</ID>
<ToolTip>Type</ToolTip>
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<ID>Property</ID>
<ToolTip>Property</ToolTip>
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There is a way to do this, but it requires an extra bit of build infrastructure. You can, relatively easily, use an AOP (aspect-oriented programming) solution like PostSharp[^] or you could use a Roslyn analyzer/generator[^].
This space for rent
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The "notify patterns" used in this case are "standard"; but not necessarily THE ONLY way.
If performance is not any issue, and UI updates are localized (usually), then simply issue a "NotifyPropertyChanged(string.Empty)" and the "UI engine" will "refresh" ALL output fields.
Used judiciously, it can make more sense to do "notifications" from your main logic than within a "setter"; particularly when it comes to real-time updates that reference multiple "outputs" for computing other outputs.
As an alternative, one can "queue" names of properties that were changed, remove duplicates, then pump them through a notify call; if that fits.
You can then leave the properties as automatic gets and setters.
Benchmark.
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I usually do this (took the code from somwhere but I cant remember the referance):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;
public abstract class NotifierBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
{
if (Equals(storage, value))
{
return false;
}
storage = value;
this.OnPropertyChanged(propertyName);
return true;
}
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
Then I simply call it like this:
private string m_Name ="";
public string Name
{
get { return m_Name; }
set
{
SetProperty(ref m_Name, value);
}
}
I just have a custom snippet to deal with the proeprty coding.
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I applaud your construction but to save 1 if statement and 1 line of code. You ROI is minimal 
I use a snippet for the entire property structure and a region surrounding all the properties. Saving half a dozen lines of code per property is just not that high on my todo list.
Never underestimate the power of human stupidity
RAH
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I have a wonderful WPF grid that I downloaded from a Codeproject article below. The problem is the grid doesn't do column sorting. Has anyone modified this grid WPF grid for column sorting? Article: DataView Paging in WPF[^]
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Even though this article is 6 years old, the best place to ask this would be in the comments at the end of the article. That way the author would be notified of your question, and any additional discussion that follows would remain associated with the article for others to find in the future.
"Fairy tales do not tell children the dragons exist. Children already know that dragons exist. Fairy tales tell children the dragons can be killed."
- G.K. Chesterton
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You are correct. The comments after article do expand on the article itself. Unfortunately nothing about column sorting. I really want to use this for my project but it requires sorting. Any ideas?
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