I have encountered a situation where it would be very useful to specify a floating point value directly in XAML and use it as a resource for several of my UI pieces. After searching around I found a good amount of information on how to include the proper assembly (mscorlib) in your XAML so you can do just that.
Unfortunately, I am getting an exception in one instance where I try to do this. Here is the following XAML that recreates the situation:
<Window x:Class="davidtestapp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:core="clr-namespace:System;assembly=mscorlib"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<core:Double x:Key="MyDouble">120</core:Double>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{StaticResource MyDouble}" />
<ColumnDefinition Width="40" />
<ColumnDefinition Width="40" />
</Grid.ColumnDefinitions>
<Rectangle Grid.Column="0" Fill="Red" />
<Rectangle Grid.Column="1" Fill="Green" />
<Rectangle Grid.Column="2" Fill="Blue" />
</Grid>
</Window>
When I attempt to compile and run this, I get an XamlParseException thrown at me which says that "'120' is not a valid value for property 'Width'".
But the "Width" property is a double, so why can't I set it using the StaticResource which was defined? Does anyone know how to do this?