Develop Reference

WPF/XAML compiles but errors show in XAML

With a colleague, we try to make a POC of a WPF application. We created a new project with a page and a resx file to test internationalization (we are French). The application work well, no error on the compile and the resx file give good data.
but in the XAML file, we have a lot of errors.
Here is the XAML header:
<Window x:Class="MAPPrintProcessEditor.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:res="clr-namespace:MAPPrintProcessEditor.Properties"
mc:Ignorable="d"
Title="MAP Print Process Editor"
WindowStartupLocation="CenterScreen"
Height="{Binding SystemParameters.PrimaryScreenHeight}" Width="{Binding SystemParameters.PrimaryScreenWidth}">
Here, is a line marked in error:
<MenuItem Header="{x:Static res:Resources.MenuItemHeaderClose}">
<MenuItem.Icon>
<Image Source="pack://application:,,,/Resources/Close-16.png"/>
</MenuItem.Icon>
</MenuItem>
Visual Studio underline only this part:
Header="{x:Static
And finally, here is the error message:
The name "Resources" does not exist in the namespace "clr-namespace:PrintProcessEditor.Properties"
What is wrong in this code?
We use VS2017 and .Net 4.6.1.

If the you can build correctly than just ignore that message and use BLEND to design your app.

VSIX CS0426 The type name Views does not exist in the type 'ABC'

I'm creating a VSIX plug-in and just added a WPF control like this:
<UserControl x:Class="ABC.Views.Configuration.MyControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ABC.Views.Configuration"
mc:Ignorable="d"
Loaded="UserControl_Loaded"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
</Grid>
</UserControl>
When I compile the project I am getting the error:
CS0426 The type name Views does not exist in the type 'ABC'
I've checked the projects' default namespace and other relevant configurations and everything looks good. In fact, I have other User Controls in the same directory that are compiling just fine.
What am I doing wrong?

The root cause of this problem was this line in XAML above:
Loaded="UserControl_Loaded"
For some reason VSIX doesn't like wiring events in XAML. I simply removed this and wired it up in Code-behind

Control Does Not Exist in Namespace

I'm attempting to use the MediaUriElement in the custom (WPFMediaKit).
I've added it into the namespace like so;
xmlns:controls="clr-namespace:WPFMediaKit.DirectShow.Controls;assembly=WPFMediaKit"
and then I have tried to access it;
<Grid>
<controls:MediaUriElement x:Name="mediaUriElement" />
</Grid>
however I just get an error: The name MediaUriElement does not exist in this namespace. VS does give me a suggestion to use it when I am typing though;
How can I correctly add this into my project?

I've tried and it is worked. What I've done:
Switched project from Framework 4.5 to Framework 4.0
Added references such as DirectShowLib-2005.dll and WPFMediaKit.dll to the project
Declared xaml namespace xmlns:controls="clr-namespace:WPFMediaKit.DirectShow.Controls;assembly=WPFMediaKit" like that:
<Window x:Class="ExcelExportWpfApplication.MainWindow"
... The code omitted for the brevity...
xmlns:controls="clr-namespace:WPFMediaKit.DirectShow.Controls;assembly=WPFMediaKit"
xmlns:vm="clr-namespace:ExcelExportWpfApplication.ViewModel"
mc:Ignorable="d"
Title="MainWindow" Height="550" Width="525"
WindowStartupLocation="CenterScreen">
And just written in xaml:
<controls:MediaUriElement Grid.Row="2"/>
No errors

Strings.resx cannot be accessed?

<Window x:Class="AFICController.View.WizardDialog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:view="clr-namespace AFICController.View"
xmlns:res="clr-namespace AFICController.Resources"
Title="{x:Static res:Strings.WizardWelcomeWindow_Title}"
ShowInTaskbar="True"
Width="800"
Height="600"
WindowStartupLocation="CenterScreen"
WindowStyle="SingleBorderWindow"
BorderBrush="#003B7B"
BorderThickness="0"
ResizeMode="CanResize"
Icon="/AFICController;component/Resources/Images/att_icon.ico"
>
<view:WizardView Loaded="WizardView_Loaded_1"/>
</Window>
I want to access my Strings.resx file from my WPF window but it give me following error :
"Strings" does not exist in the namespace "clr-namespace AFICController.Resources".
C:\Users\systellex\Dropbox\Projects\AFICController\AFICController\View\WizardDialog.xaml
\AFICController
I know the problem is at "Title="{x:Static res:Strings.WizardWelcomeWindow_Title}" but I dont know how to sort out the actual error? Can anyone explain where the exact problem exists? Any help would be highly appreciable?

This will also works for..
Also change the Access modifier of your Resource file to Public
Title="{Binding Source={x:Static res:Strings.WizardWelcomeWindow_Title}}"

That depends a bit on your project setup. Very common is
Title="{x:Static Properties.Resources.WizardWelcomeWindow_Title}"

Check you resx-file you have to set the access modificator to public.
Otherwise, no static access methods are created

Adding x:Name to a user control gives error in generated code of page its used in

I am basically using a user control for the first time, so hopefully it's just a dumb mistake.
I have a simple user control
<UserControl x:Class="TestProject.WebApp.myUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.DomainServices"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">
<Grid>
<sdk:AutoCompleteBox Name="myACB" ItemsSource="{Binding Data}" FilterMode="StartsWith" MinimumPrefixLength="2" >
</sdk:AutoCompleteBox>
</Grid>
</UserControl>
I am using the control in another page (in a stack panel):
<navigation:Page x:Class="TestProject.WebApp.myPageView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:local="clr-namespace:TestProject.WebApp"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation">
<Grid>
<StackPanel Orientation="Horizontal">
<local:myUserControl x:Name="myUC" />
</StackPanel>
</Grid>
</navigation:Page>
The control is in the same namespace as page. Removing the x:Name allows the project to compile and the control functionally works. When x:Name is specified I get an error in the generated code of the page:
Type 'TestProject.WebApp.myUserControl' is not defined.
It happens on these lines of code:
internal TestProject.WebApp.myUserControl myUC;
this.myUC == (TestProject.WebApp.myUserControl)this.FindName("myUC")
I tried with two different controls. Same thing. The generated code has "using TestProject.WebApp;" so I don't know why there is an error only when I have a named instance of the control.
I also cannot seem to use just the Name property. I even tried overloading the NameProperty in the control.

I was able to find a post about this here:
.g.vb file claims that Type X is not defined, even though it is!
Apparently, there is an issue when a project has a service reference (in my case I am using RIA services) and the user control resides in an assembly with the same root namespace as the one you are trying to use it in.
So for me it was,
TestProject.WebApp
Then I tried creating a new project for just the control
TestProject.Controls
Same problem.
Then, when I renamed the project and changed the namespace to
CustomControls
it worked.
Hopefully this saves someone else from some frustration and I really hope this problem can be fixed by MS soon.

What you are showing here should work. What is the default namespace in your project property's? Also did you rename your user control after you created it. Both of those issues could be causing you problems.