How can I define a variable in XAML?
WpfXamlVariablesWpf Problem Overview
I have the following two buttons in XAML:
<Button Content="Previous"
Margin="10,0,0,10"/>
<Button Content="Next"
Margin="0,0,10,10"/>
How can I define "10" to be a variable so I can change it in one place, something like this:
PSEUDO CODE:
<variable x:key="theMargin"/>
<Button Content="Previous"
Margin="{Variable theMargin},0,0,{Variable theMargin}"/>
<Button Content="Next"
Margin="0,0,{Variable theMargin},{Variable theMargin}"/>
Wpf Solutions
Solution 1 - Wpf
Try this:
add to the head of the xamlfile
xmlns:System="clr-namespace:System;assembly=mscorlib"
Then Add this to the resource section:
<System:Double x:Key="theMargin">2.35</System:Double>
Lastly, use a thickness on the margin:
<Button Content="Next">
<Button.Margin>
<Thickness Top="{StaticResource theMargin}" Left="0" Right="0"
Bottom ="{StaticResource theMargin}" />
</Button.Margin>
</Button>
A lot of system types can be defined this way: int, char, string, DateTime, etc
Note: You're right... Had to do some better testing.. changed to code so that it should work
Solution 2 - Wpf
Similiar to Sorskoot's answer, you can add a thickness resource to use, thereby defining each margin direction independently
<UserControl.Resources>
<Thickness x:Key="myMargin" Top="5" Left="10" Right="10" Bottom ="5"></Thickness>
</UserControl.Resources>
Then just use the Thickness as the Margin:
<Button Content="Next" Margin="{StaticResource myMargin}"/>
Solution 3 - Wpf
Why don't you try adding the value as a StaticResource
?
Resources.Add("theMargin", 10);
Then you can get that value like this:
<Button Content="Previous"
Margin="{StaticResource theMargin},0,0,{StaticResource theMargin}"/>
<Button Content="Next"
Margin="0,0,{StaticResource theMargin},{StaticResource theMargin}"/>
Solution 4 - Wpf
You need invoke this before InitializeComponent or use INotifyPropertyChanged Interface after that
Solution 5 - Wpf
In .NET Core @Sorskoot's answer was working, but produced a warning. So instead I used this namespace declaration:
xmlns:system="clr-namespace:System;assembly=System.Runtime"