Sunday, December 25, 2011

How to get unrestricted access in Silverlight 5

As you all know Silverlight 5 released with unrestricted access in InBrowser mode which gives full control to the Silverlight developers in the client machine. This post is to describe what are the changes you need to do at the server side as well as client side to leverage the trusted application feature.
  • Server side
    1. Make the IB elevated from project properties
    2. Sign the xap using certificate.

    1. Client side
      1. Install the cert into “trusted publishers”
      2. Change the reg key “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Silverlight\AllowElevatedTrustAppsInBrowser” to 1
      3. The “Protected mode” of browser should be turned off for the zone.
    The above steps are mainly for Silverlight 4 to Silverlight 5 conversion and want to get the full trust support. If you just upgrading your projects there is no need to do above items. Just open in Visual Studio 2010 after installing the SL 5 tools.It will show the conversion wizard and just follows that. One thing you need to make sure is the reference path to Sl 5 assemblies.

    Steps to setup Silverlight 5 application to have unrestricted access in IB using elevated trust mode

    Ok.Now lets look at details of how we can create new SL project which access a file from c:\ in the In-Browse mode.First as usual create a Silverlight 5 Application. Then place a Button inside and wire the Click event handler.Write the below code in the handler to write a file to c:\

    private void btnWriteToCDrive_Click ( object sender, RoutedEventArgs e )
    {
        File.WriteAllText(@"c:\FromSL5.txt","This is written from Silverlight 5 web application in InBrowser mode");
    }

    Giving Elevated trust to SL 5 application

    Just to go to the Silverlight 5 project properties and in the Silverlight tab check the “Require elevated trust when running in-browser” check box.See the below screen shot for reference.

    Signing the xap

    Next step is to sign the xap file with a certificate. Just goto Silverlight project properties and check the “Sign the Xap File” check box.If you don’t have any certificate just create a new one using the “Create Test Certificate” button.

    Disable the browser protected mode

    The above changes are mainly for the server side. You need to do some at client side as well.The first one is to disable the protected mode in browser.Goto the internet options and disable it.

    Change registry entry

    As mentioned above just change the registry entry as it is.If you cant find the key just add a DWORD and set to 1. Still I am not sure how this step is carried out in other platforms such as MAC and Linux.

    That’s it.Now run your application.It will create a file inside c:\ from in browser.Just uploaded the sample by removing the certificate as it give some information about my company laptop Smile


    Welcome to my general coding blog.

    Most probably this will be my last post in this Silverlight technology blog. It’s a hard decision to stop this blog and use my general coding blog for all the programming related posts. Still I don’t know why I started separate blogs for each technology.May be my knowledge in SEO at that time lead me to have a new blog with technology name in the URL.Anyway changes are needed and I think this is the time to afford that. If possible I will post a last good bye post .Anyway you can start following me in my coding blog where my new Silverlight posts will come soon and it is.
    Joymon v/s Code

    4 comments:

    Raj Arya said...

    Hi,

    I have hosted my silverlight application on server side having elevated permission.i signed my xap and install it in trusted publishers and trusted publishers root authorities.

    I am running on server everything is fine.It has elevated permission its uploading file.

    But problem starts when i browse same application from another machine or client machine.From there i didnt get any elevated permission.To resolve this i did following:-

    1)I installed same certificate in trusted publishers and trusted publishers root authorities at client side.

    2)I created registry entry for elevated permission at client side

    3)I removed protected mode of IE at client side.

    But still from client side application is not able to access file.

    Please help me out.Its very urgent.

    rahul

    Raj Arya said...

    Hi,

    I have hosted my silverlight application on server side having elevated permission.i signed my xap and install it in trusted publishers and trusted publishers root authorities.

    I am running on server everything is fine.It has elevated permission its uploading file.

    But problem starts when i browse same application from another machine or client machine.From there i didnt get any elevated permission.To resolve this i did following:-

    1)I installed same certificate in trusted publishers and trusted publishers root authorities at client side.

    2)I created registry entry for elevated permission at client side

    3)I removed protected mode of IE at client side.

    But still from client side application is not able to access file.

    Please help me out.Its very urgent.

    rahul

    Joy George said...

    - What feature you are trying to access in this elevated mode?

    - Are you experiencing it in your client development machine? If so please share the exception details if any exception occurred

    - If you getting any exception in production environment, please try to catch the exception in the Application_Unhandled event handler and share here.

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