Hi,
I'm working on a intranet solution.
I'm trying to call asynchronously a web service on the same server and virtual directory of the aspx page (the one that generates the html with the <object ...> tag).
The smart client actually gets a dataset from the webservice and displays it on a datagrid.
With the sync version everything works fine.
With the async when I use Invoke to set the dataset:
public void getSessionDSCallback(IAsyncResult ar)
{
Trace.WriteLine("inizio getSessionDSCallback");
ds = new DataSet();
it.creval.WPEX.Includes.ControlliBrowser.WPEX.Net.ListaAssegni pf = (it.creval.WPEX.Includes.ControlliBrowser.WPEX.Net.ListaAssegni) ar.AsyncState;
pf.Credentials = CredentialCache.DefaultCredentials;
// Get the completed results.
ds = pf.EndgetSessionDS(ar);
DataBindToDataGridMethodDelegate CallDataBindToDataGrid = new DataBindToDataGridMethodDelegate(this.DataBindToDataGrid);
Object[] newArgs = new Object[1];
newArgs[0] = ds;
Trace.WriteLine("invoke");
try
{
Invoke(CallDataBindToDataGrid, newArgs);
}
catch (Exception anException)
{ Trace.WriteLine("getSessionDSCallback " + anException.Message + anException.StackTrace);
}
Trace.WriteLine("fine getSessionDSCallback");
}
I get
[964] inizio getSessionDSCallback
[964] invoke
[964] getSessionDSCallback Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed. at System.Security.CodeAccessSecurityEngine.CheckHelper(PermissionSet grantedSet, PermissionSet deniedSet, CodeAccessPermission demand, PermissionToken permToken)
[964] at System.Security.CodeAccessSecurityEngine.Check(PermissionToken permToken, CodeAccessPermission demand, StackCrawlMark& stackMark, Int32 checkFrames, Int32 unrestrictedOverride)
[964] at System.Security.CodeAccessSecurityEngine.Check(CodeAccessPermission cap, StackCrawlMark& stackMark)
[964] at System.Security.CodeAccessPermission.Demand()
[964] at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
[964] at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
[964] at it.creval.WPEX.Includes.ControlliBrowser.SessionDataGrid.getSessionDSCallback(IAsyncResult ar)
[964] fine getSessionDSCallback

This problem is caused by the different thread were the getSessionDSCallback method is called.
The call to invoke use some unmanaged code.
When I give "Allow calls to unmanaged assemblies" to all_code the smart client is working fine.
Does someone if there's a way to give this policy only to a subset of code?

Thanks in advance for any help.
Carlo