Add a BusyIndicator dynamically to a Silverlight ChildWindow

Jose Lopez
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I used the following code to add a BusyIndicator dynamically to a ChildWindow in a Silverlight 4 application, I made it according to the following premises:

1. If it's a ChildWindow the Content property should be setted to a Grid.

2. If it's a Silverlight Page the Content property could be a ScrollViewer or a Grid.

After this, I created a static class name Utilities in which I wrote the following code:

public static void SetBusyState(Object Content, bool IsBusy)
{
Grid pageGrid = null; //a variable to handle the page/Window main Grid
BusyIndicator _indicator = null; //the busyIndicator content (Silverlight 4 SDK)
try
{
pageGrid = (Grid)Content; //tries to parse the content into a Grid
}
catch //If an exception is thrown (is not a grid)
{
try
{
pageGrid = ((Grid)((ScrollViewer)Content).Content); //we look if it's a ScrollViewer
}
catch //If an exception is Thrown (content is not a ScrollViewer)
{
pageGrid = null; //if not the control is set to null (you can try to parse another
//type)
}
}
if (pageGrid != null) //if the above code found the Grid
{
try
{
foreach (UIElement p in pageGrid.Children) //Now we interate the Grid Children until
{
try
{
_indicator = (BusyIndicator)p; //the busyIndicator is found
if (_indicator != null && IsBusy)//if we find it (and we want to set it to busy)
{
//set the busyIndicator to Busy (with a default message stored on the App resources).
_indicator.BusyContent = ApplicationStrings.PleaseWaitMessage;
_indicator.IsBusy = IsBusy;
}
else if (_indicator != null && !IsBusy) //if we find it but is set to false
{
pageGrid.Children.Remove(_indicator); //just remove it from the Grid
}
}
catch
{
continue; //continues the cycle after every exception (control not found)
}
}
if (_indicator == null && IsBusy) //if the control is not added to the page/window
{
_indicator = new BusyIndicator(); //creates a new BusyIndicator
_indicator.Margin = new Thickness(0, 0, 0, 0); //Set its position
_indicator.Width = pageGrid.Width; //Set its widht as the same as Grid
_indicator.Height = pageGrid.Height; //Set its height as the same as Grid
_indicator.BusyContent = ApplicationStrings.PleaseWaitMessage; //The Message
_indicator.IsBusy = IsBusy; //Set it to busy
pageGrid.Children.Add(_indicator); //Adds the control the Grid
}
}
catch
{
Ocupado(Content, IsBusy);//this line here helps you when the Content state is not valid
//generally happens when a IvalidOperationException is thron, so we call the method
//until the state is valid
}
}
}

To use the SetBusyState function you just have to call it by passing the Page/Window Content property and the value you want to set to the BusyIndicator.