Develop Reference

How do I remove the borders separating the headers in a Listview in XAML (WPF)?

I am making a ListView which loads users in from an Active Directory. To accomplish the brand/styling of the company I am developing the application for I would like to tweak some of the styling of the ListView element.
I have made it so the border of the headers in the Listview are transparent. In the editor in Visual Studio it looks how I want it to be, but when I look at the headers in the ListView in runtime I still get to see borders separating the headers (See image below).
https://i.gyazo.com/99dc8d60d6c5b2e1761456df685d850f.png
I have already tried Googling and I even went to the second page of the Google search result. Can you imagine?
Down here is the style I have used for the headers in my XAML file
<Style x:Key="ListViewHeaderStyle" TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="Background" Value="Transparent"></Setter>
<Setter Property="BorderBrush" Value="Transparent"></Setter>
<Setter Property="IsHitTestVisible" Value="False"></Setter>
</Style>
What I want is to remove those borders separating the headers in my ListView element.

You can override the template of the GridViewColumnHeader
<Window.Resources>
<Style x:Key="GridHeader" TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
<TextBlock Text="{TemplateBinding Content}" Padding="5"
Width="{TemplateBinding Width}" TextAlignment="Right" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<ListView>
<ListView.View>
<GridView ColumnHeaderContainerStyle="{StaticResource GridHeader}">
</ListView.View>
</ListView>
Solution taken form here: Remove Separators in ListView Columns - WPF

How to avoid childrens of groupbox taking there default styles which are defined in resource or resourcedictionary in wpf

Style defined in Resource
<Setter Property="Background" Value="Red"/>
</Style>enter code here
</Window.Resources>
In window i am adding a groupbox with child label .
<Grid>
<GroupBox Header="Header">
<GroupBox.Resources>
<Style TargetType="{x:Type GroupBox}">
<Setter Property="Background" Value="white"/>
</Style>
</GroupBox.Resources>
<Label Content="dsfdsfdsf" Foreground="Black" />
</GroupBox>
</Grid>
My Expected Result was Label taking background of white . But actually it is taking Red Background (that is defined in style of Resource )
If i set the style of the Label to explicitly null it works fine
Label Content="dsfdsfdsf" Foreground="Black" Style={x:Null}
But Controls to GroupBox are dynamically added so i want to set
Style={x:Null} to all childrens that are being added to Group box
if i set OverrideDefalutStyle to True in Label the content of label is not comming ......................
Label Content="dsfdsfdsf" Foreground="Black" OverridesDefaultStyle="True"

That style in GroupBox.Resources has no effect on the GroupBox itself. The implicit GroupBox's style is the one of its closest ancestor on VisualTree. You put that style in the wrong place.
Or use Style property instead
<Grid>
<GroupBox Header="Header">
<GroupBox.Style>
<Style TargetType="{x:Type GroupBox}">
<Setter Property="Background" Value="white"/>
</Style>
</GroupBox.Style>
<Label Content="dsfdsfdsf" Foreground="Black" />
</GroupBox>
</Grid>

By setting
<Style TargetType="{x:Type GroupBox}">
<Setter Property="Background" Value="White"/>
</Style>
you will set the background of all GroupBox controls within your GroupBox and the GroupBox itself to white.
So if you want to set/override the Background of all Labels within your GroupBox just add an additional Style to your GroupBox targeting Label
<Style TargetType="{x:Type Label}">
<Setter Property="Background" Value="White"/>
</Style>
If you want to reset the style property of your Label just add an empty style definition to your GroupBox
<Style TargetType="{x:Type Label}"/>
The next approach is used on your on risk :)
If you only want to reset the background color, you can do this trick/hack to reset:
<Style TargetType="{x:Type Label}">
<Setter Property="Background" Value="{Binding Background.DefaultValue, RelativeSource={RelativeSource Self}}" />
<Setter Property="Foreground" Value="Black" />
</Style>
Hint: Instead of Background.DefaultValue you can also write Background.ABC the main thing here is that the binding goes wrong.

How to access a styles resources and retrieve an inner style that doesn't have a key

I have a style for a stack panel which has a key, within the stack panel I have buttons which have a default style set via the stack panel's Style > Resources > Styles, for this reason the buttons style is not set via a key but instead is set as it is a child of the stack panel! I'm sure this is a little tricky to understand as it sure feels tricky to explain... here is the style code...
<Style x:Key="VerticalMenuPanel" TargetType="{x:Type StackPanel}">
<Setter Property="Background" Value="#115e9a" />
<Style.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="Transparent" />
<Setter Property="Margin" Value="0,0,0,0" />
<Setter Property="Foreground" Value="White" />
<Setter Property="FontSize" Value="13" />
<Setter Property="FontFamily" Value="Calibri" />
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="Height" Value="27" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border BorderBrush="White" BorderThickness="0,0,0,1">
<Border BorderBrush="#0160a2" BorderThickness="0,0,0,1.5">
<ContentPresenter VerticalAlignment="Center" />
</Border>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style.Resources>
</Style>
So, basically, without getting into what I'm doing too much I require the need to change the style of the buttons within the stack panel based on certain events. In order to change the style I simply find the resource based on the style key! HOWEVER here is my problem, I can't reset the style back to the "default" style provided by the parent the "VerticalMenuPanel"s Style.Resources as I don't know how to retrieve the style without having a definitive key for it. The obvious thing to do would be to give the button style a key but then I would have to explicitly define the style for all of the buttons instead of the style being applied by default as it is a child of the stack panel!
The bottom line is how do I retrieve a style without a key from within a parent styles resources (programatically)? Obviously I can retrieve the parent style via its key.
I hope you understand the issue I am having, and please feel free to let me know if I can explain anything better, add more clarity or if you wish edit the post yourself :)

When the Key is not provided for a style, the TargetType becomes the key of that style.
Here is an example:
<Grid x:Name="layoutRoot">
<Grid.Resources>
<Style TargetType="Button">
<Setter Property="Width" Value="100" />
</Style>
</Grid.Resources>
<Button />
</Grid>
then in the code-behind you can retrieve the default style using the Button type as the resource Key:
Style buttonStyle = layoutRoot.FindResource(typeof(Button)) as Style;

How to have multiple window resource styles for same element type in WPF

I have an element in my window, as below:
<Grid>
<DockPanel LastChildFill="True">
<Label Name="StatisticsLabel" DockPanel.Dock="Bottom"></Label>
<RichTextBox Style="{StaticResource FocusMode}" Name="RichTextBox1" />
</DockPanel>
</Grid>
I would like to swith between two styles at runtime depending of the state I need the control to be in.
I had assumed I could use the following code:
<Window.Resources>
<Style x:Name="FocusMode" TargetType="RichTextBox">
<Setter Property="VerticalScrollBarVisibility" Value="Disabled"></Setter>
</Style>
<Style x:Name="NormalMode" TargetType="RichTextBox">
<Setter Property="VerticalScrollBarVisibility" Value="Auto"></Setter>
</Style>
</Window.Resources>
Of course this isn't working.
Why does WPF not support multiple styles per element? Seems like a pretty basic requirement?
Otherwise, how do I achieve this?

Sorry figured it out, instead of x:Name use x:Key as below:
<Window.Resources>
<Style x:Key="FocusMode" TargetType="RichTextBox">
<Setter Property="VerticalScrollBarVisibility" Value="Disabled"></Setter>
</Style>
<Style x:Key="NormalMode" TargetType="RichTextBox">
<Setter Property="VerticalScrollBarVisibility" Value="Auto"></Setter>
</Style>

I'd have a look at style triggers. You can probably get a good start on the subject from this post: How to make Style.Triggers trigger a different named style to be applied

WPF: how to style a class like in css?

Let's say I have a UserControl with 4 Borders:
<Border />
<Border />
<Border />
<Border />
Now in my Resources I can go:
<Style TargetType="{x:Type Border}">
... change some properties here
</Style>
Now this is all good, but it will target all borders in my UserControl.
But what if I just want to target a subset of them?
I'd like to go:
<Border Class="Type1" />
<Border Class="Type1" />
<Border />
<Border />
And then go:
<Style TargetType="{x:Type Border}" TargetClass="Type1">
... change some properties here
</Style>
But this obviously doesn't exist, is there some other way I can achieve what I'm after?
Thanks

Though the syntax isn't quite as clean as in CSS, it is a lot more specific.
To build on your example, what you're looking for is:
<Border Style="{StaticResource Type1}" />
<Border Style="{StaticResource Type1}" />
<Border />
<Border />
And then go:
<Style TargetType="{x:Type Border}" x:Key="Type1">
... change some properties here
</Style>
Remember that WPF styles don't actually cascade like CSS does.
A more detailed styling reference:
https://web.archive.org/web/20141210000517/http://dotnetslackers.com/articles/wpf/StylesResourcesAndControlTemplatesInWPF.aspx

Something that I find most people are not aware of is WPF's ability to nest Styles within Style.Resources. For example:
<!-- Define a new style for Borders called InfoBox, that will have a red background,
and further override all buttons within it to have Yellow Text. An extra style,
"Strawberry" is also defined, that lets specific buttons be selected to be styled
as Green FG on DarkRed BG -->
<Style TargetType="{x:Type Border}" x:Key="InfoBox">
<Setter Property="Background" Value="Red"/>
<Style.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="DarkYellow"/>
</Style>
<Style TargetType="{x:Type Button}" x:Key="Strawberry">
<Setter Property="Foreground" Value="Green"/>
<Setter Property="Background" Value="DarkRed"/>
</Style>
</Style.Resources>
</Style>
...
<Border Style="{DynamicResource InfoBox}">
<StackPanel>
<Button Content="I am a banana!"/>
<Button Style="{DynamicResource Strawberry}" Content="I am red!"/>
</StackPanel>
</Border>
While not exactly the same as CSS (There isn't much support for standard pseudo-selectors), this gives you a huge amount of power and flexibility. Couple this with skillful use of ItemsControls and you can do some great things.

you can set the style directly on the <Border> using an x:key and the StaticResource (or DynamicResource) property of the Border. if you would like to change the style at runtime, then you should lean towards using the DynamicResource over the StaticResource.
<Style x:Key="something" TargetType="{x:Type Border}">
</Style>
<Border style="{StaticResource something}"/>

<Style x:Key="styleKey" TargetType="{x:Type Border}">
... change some properties here
</Style>
and
<Border Style="{StaticResource styleKey}"