Provide value on 'System.Windows.StaticResourceExtension

Question

Inside a XAML Page I'm trying to use an IValueConverter, it's throwing an error.

The IValueConverter is in another assembly, I have added a reference
There are no design-time errors
I have assigned the StaticResource with a ResourceKey

At the top of my page I have this:

xmlns:converters="clr-namespace:Converters;assembly=Converters"

<Page.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Styles/DialogStyles.xaml" />
        </ResourceDictionary.MergedDictionaries>
        <converters:NoWhiteSpaceConverter x:Key="NoWhiteSpaceConverter" />
    </ResourceDictionary>
</Page.Resources>

Then I try to use it later on like this:

<TextBox Text="{Binding SomeText, Converter={StaticResource NoWhiteSpaceConverter}}" />

Can anyone see what the problem is?

Can you put the resource into the App.xaml? Maybe you ran into a problem like this one: http://www.paulkiddie.com/2011/10/the-importance-of-the-position-of-window-resources-element-in-wpf-xaml-markup/ — Sebastian, Dec 13 '12 at 14:36
I'm having the same issue, reloading the designer seems to solve the issue untill you restart visual studio... — Dtex, Dec 13 '12 at 14:39
@DTex, No, not that this time, although that did fix something else yesterday. — Drahcir, Dec 13 '12 at 14:42
@Sebastian, Thanks, this is working now. If you post as answer and I will mark. — Drahcir, Dec 13 '12 at 14:42
@Sebastian Yes sorry i got it the other way around, i have a design time error but no error at runtime — Dtex, Dec 13 '12 at 14:51

Sebastian · Accepted Answer · 2023-01-25T16:29:05.270

17

Make sure that the resources are defined before the usage (in Xaml parsing order). The easiest way is to place it into App.xaml

See also here for a similar issue: https://paulkiddie.com/the-importance-of-the-position-of-window-resources-element-in-wpf-xaml-markup/

edited Jan 25 '23 at 16:29

answered Dec 13 '12 at 19:03

Sebastian

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I define a converter in App.xaml and assign it a key. I get that exception when I reference the converter from a `UserControl` in the app. – Shimmy Weitzhandler Nov 21 '17 at 23:44
The link does not work. – Denis Gladkiy Jan 25 '23 at 05:47

score 1 · Answer 2 · answered Aug 25 '21 at 09:57

In my case the resource was correctly defined before it is used but there was a wrong reference to a converter.

The problematic line was

...{Binding MyProperty, Converter={StaticResource local:MyConverter}}

and it should be without the namespace alias

...{Binding MyProperty, Converter={StaticResource MyConverter}}

where local is a namespace alias containig the converter class and MyConverter is the key defined in a resource in the XAML.

Provide value on 'System.Windows.StaticResourceExtension

2 Answers2

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