E_FAIL COM error creating Silverlight User Control with Microsoft.LightSwitch.Client

E_FAIL COM error creating Silverlight User Control with Microsoft.LightSwitch.Client

I'm attempting to follow the instructions to create a reusable modal window in LightSwitch from Jan Van der Haegen's blog. However after I click to add a new Silverlight User Control to the Client, and input the xaml I'm met with errors. I reduced the code to the shortest section that gives me an error:

HRESULT E_FAIL has been returned from a call to a COM component.

From the following xaml:

<shellUtils:ScreenChildWindow     xmlns:shellUtils="clr-namespace:Microsoft.LightSwitch.Runtime.Shell.Framework;assembly=Microsoft.LightSwitch.Client"> </shellUtils:ScreenChildWindow> 

I just installed Visual Studio 2012 in a virtual machine, created a new project, new Client Silverlight User Control, and tried the same code and received the same error.

I also receive it with this code and others referencing Microsoft.LightSwitch.Client:

<Framework:GroupBox     xmlns:Framework="clr-namespace:Microsoft.LightSwitch.Presentation.Framework;assembly=Microsoft.LightSwitch.Client"> </Framework:GroupBox> 

Comments on the blog seem to indicate others have this error but I haven't found a solution anywhere yet. I also see the same/similar on Stackoverflow here, but unanswered.

Answers & Comments...

Answer: 1

After scouring the internet for the slightest related issue, I discovered at least in my case the design view errors can be entirely ignored.

Even with the other errors I didn't mention:

Undefined CLR namespace. The 'clr-namespace' URI refers to a namespace Microsoft.LightSwitch.Cosmopolitan.Presentation.Controls' that could not be found.

The type 'ctls:OverflowControl' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

An error occurred while finding the resource dictionary /Microsoft.LightSwitch.Cosmopolitan.Client;component/Presentation/Shells/BasicStyles.xaml"

The control works perfectly. All the assembly preferences are present, so I'm not sure why the designer claims otherwise.

by : Christopher Galpinhttp://stackoverflow.com/users/879

Answer: 2

Yes that's correct, just close the preview window. The XAML designer has a hard time rendering the control when referencing the LS assemblies. You can ignore these errors.

If you're seeing these errors elsewhwere please let me know and we can investigate.

by : Beth Massihttp://stackoverflow.com/users/1739190

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