The Media Center Sandbox

Hi, at first i thought i would use binding to update the UI in response to a button click but seems that any code is executed before the UI is updated, which means the updated UI isn't shown or is shown to late.

So i created a new page which contains the updated UI, now when the page loads i want it to invoke a command in the code behind. I can invoke the command by adding a button but i'd like it to happen without the need to click the button.

Any ideas as to how i can acheive this?

Thanks

To invoke a command the first time your page is navigated to, put a bool property with a value of true in your code behind called "FirstRun" and check it in your rules. If true, set it to false then execute your command in your rule.

If you want something to happen every time your page is navigated to, or navigated back to (i.e. backpage in the page stack - every time your page becomes visible), then put the bool property in the section rather than in your code behind.

Cheers,
Andrew

Thanks for the repy AndyC, not sure what i'm doing wrong.

This is my code behind:

private bool firstrun = true;

public bool FirstRun

{

get

{

return firstrun;

}

set

{

firstrun = value;

FirePropertyChanged("FirstRun");

}

}

I'm using this in mcml:

<Rule>

<Conditions>

<Equality Source="[Model.FirstRun]" Value="false" />

</Conditions>

<Actions>

<Invoke InvokePolicy="AsynchronousNormal" Target="[Model.Tuner.Invoke]"/>

</Actions>

</Rule>

 

At the moment page loads no command invoked, if i set to true command is invoked but the page doesn't load.

Any ideas

Thanks

You're checking FirstRun is false in your MCML - you want to check it's true!

You also need to set FirstRun to false prior to your Invoke.

Cheers,
Andrew

Didn't read the other bit enough - if it's not loading the page, it most likely means that the code you're invoking has an issue.

Cheers
Andrew

Thanks again AndyC for your help.

Edited post as although the command was invoked on the page load, somehow i lost any reference to mcstore, which is required by our app.

So finally i now have this working, one of the key items was the InvokePolicy which had to be set to

AsynchronousLowPri, set to any other and it wouldn't work.

I also found having "Model" navigate to the page and setting the FirstRun value to true, overcome

any issues with the code.

Thanks

If anyone needs an example, if having similar issues just ask and i'll post the code.