This is awesome. Thanks Michael, Karol, Alan, and Sheel!

So many doors are open with LS now.

Very good job. Rachida

Great article - I like the idea about the 'Custom Shell' which could turn out to be very powerful.

I tried the ideas on this page. I have a custom control containing a textbox that executes its KeyDown method when the user presses the Enter button. But for some reason my custom control does not remember the value entered in the textbox. But if I enter another value and press Enter, a second time, the first value I entered before seems to be remembered. Here's my code:

private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
// When user presses Enter, call the OpenTransactionList method on the Home (parent of the custom control) screen.
if (e.Key == Key.Enter)
{
// Get a reference to the LightSwitch DataContext
var objDataContext = (IContentItem)this.DataContext;

// Get a reference to the LightSwitch Screen
var Screen = (Microsoft.LightSwitch.Client.IScreenObject)objDataContext.Screen;

// Call the Method on the LightSwitch screen
Screen.Details.Dispatcher.BeginInvoke(() =>
{
Screen.Details.Methods["OpenTransactionList"].CreateInvocation(null).Execute();
});
}
}

Is there a way to get a returning value from Light Switch from a Silverlight Control?

eg, In my screen code

// Interface
void UserCode.IInventoryManagement.TransfeerInventory()
{
//TransfeerInventory_Execute();
return "Hello"
}


Then on my Silverlight Control some like the following...

var objDataContext = (IContentItem)this.DataContext;
var Screen = (Microsoft.LightSwitch.Client.IScreenObject)objDataContext.Screen;

string myVar = "Empty";

var SilverlightBridge = (LightSwitchApplication.UserCode.ISilverLightBridge)Screen;

Screen.Details.Dispatcher.BeginInvoke(() =>
{
myVar = SilverlightBridge.GetVehicleID();

});

MessageBox.Show(myVar) ;


The issue I have is that myVar isn't being set. Would you have a recommendation?

Thanks Michael - your Lightswitch work is some of the best out there.

I can't find these two dlls Microsoft.LightSwitch, Microsoft.LightSwitch.Client in the ClientGenerated folder when I upgraded to Visual Studio 2012. I tried adding the ones in the Client\bin\debug folder but they dont work as well. Is there another way to call lightswitch from silverlight?

I also tried creating a new lightswitch project for visual studio 2012 and the ClientGenerated folder is completely missing. What should I do? Thanks for the quick reply.

Hey Michael, thanks for this post. I’m getting an error on my IExecutable class calling my screen:

I’m calling a screen on the ExecutaAsyn method like this:
public void ExecuteAsync()
{
Microsoft.LightSwitch.Threading.Dispatchers.Main.BeginInvoke(() =>
{
Application.Current.ShowCustomersListDetail();

});
}

But on execution when I click the button I get this error: ” Operation is not valid due to the current state of the object.”

Any help is much appreciated!

Hi Michael,

I follow your example in this article but it is not working. Not sure what I am doing wrong. For some reason, you are not allow to reference Microsoft.LightSwitch, Microsoft.LightSwitch.Client or Microsoft.LightSwitch.Client.Presentation from within Silverlight control. Just curious, how did your example code work for you? Also, because you can't reference the above assemblies, your code will error out on any reference to the IContentItem or DataContext, since these are in the above assemblies. I am sure I am missing something.

Hi Michael,

The Karol Method
In Visual studio 2012 there is no longer a Common project.
So I added the Interface to DesktopClient/Shared folder

I then added a reference to DesktopClient.Client in my Silverlight Project
All compiles but when I run the project I get a Webpage Error

Error: Unhandled Error in Silverlight Application
Code: 2028
Category: ParserError
Message: The name already exists in the tree: DesktopClient.Client.
File:
Line: 0
Position: 0


When I add the line.

Dim CBOMaintenanceScreen = CType(Screen, LightSwitchApplication.UserCode.ICBOMaintenance)

Any Ideas would be much appreciated.
Regards,
Dean