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Setting TextBox FontFamily property from Style causes XamlObjectWriterException

See original GitHub issue

<Style Selector="TextBox.export">
    <Setter Property="FontFamily" Value="Consolas"/>
</Style>

version: 0.7.1-build989-beta

Portable.Xaml.XamlObjectWriterException
  HResult=0x80131500
  Message=Set value of member '{clr-namespace:Avalonia.Styling;assembly=Avalonia.Styling}Setter.Value' threw an exception
  Source=Avalonia.Markup.Xaml
  StackTrace:
   at Portable.Xaml.XamlObjectWriterInternal.SetValue(XamlMember member, Object target, Object value)
   at Portable.Xaml.XamlObjectWriterInternal.SetValue(XamlMember member, Object value)
   at Portable.Xaml.XamlObjectWriterInternal.OnWriteEndMember()
   at Portable.Xaml.XamlWriterInternalBase.WriteEndMember()
   at Portable.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.LoadFromReader(XamlReader reader, AvaloniaXamlContext context, IAmbientProvider parentAmbientProvider)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Stream stream, Assembly localAssembly, Object rootInstance, Uri uri)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Type type, Object rootInstance)
   at Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(Object obj)
   at ThemeEditor.App.Initialize() in C:\DOWNLOADS\GitHub\ThemeEditor\src\ThemeEditor\App.xaml.cs:line 10
   at Avalonia.Controls.AppBuilderBase`1.Setup()
   at Avalonia.Controls.AppBuilderBase`1.Start[TMainWindow](Func`1 dataContextProvider)
   at ThemeEditor.Program.Main(String[] args) in C:\DOWNLOADS\GitHub\ThemeEditor\src\ThemeEditor\Program.cs:line 19

Inner Exception 1:
NullReferenceException: Object reference not set to an instance of an object.

Issue Analytics

State:
Created 5 years ago
Comments:20 (10 by maintainers)

Top GitHub Comments

1reaction

Gillibaldcommented, Jan 6, 2019

I guess you could define the font family in code by defining a static property and reference it in your style.

0reactions

arun-katcommented, Sep 5, 2019

I also see the same issue as MiKaMaru with the Button control.

I’m able to set the other properties using the syntax below, but I get the error: “NullReferenceException: Object reference not set to an instance of an object.” for the FontFamily line.

<Style Selector="Button">
  <Setter Property="Background" Value="LightGray"/>
  <Setter Property="FontSize" Value= "12"/>
  <Setter Property="BorderThickness" Value= "1"/>
  <Setter Property="BorderBrush" Value= "#6C6F70"/>
  <Setter Property="FontFamily" Value ="Arial"/>
</Style>

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