c# - Using Value Converters in WPF without having to define them as resources first

Question

Is it possible to use value converters without having to define them beforehand as resources?

Right now I have

<Window.Resources>
    <local:TrivialFormatter x:Key="trivialFormatter" />
</Window.Resources>

and

<Button Width="{Binding Width, 
               ElementName=textBox1, 
               UpdateSourceTrigger=PropertyChanged, 
               Converter={StaticResource trivialFormatter}}">

Wouldn't it be possible that instead of having to declare the trivialFormatter resource in Window.Resources, I could directly refer it from the Button's width binding? Something like

Converter = {local:TrivialFormatter}

Thanks

Answer 1

In the case of singleton-type IValueConverters (e.g. they don't need any state from the current binding instance) I use static converters, i.e.:

Converter={x:Static SomeNamespace:SomeConverter.Instance}

There's also a great post by Dr. WPF on using a markup extension to make it cleaner inline here.