[IronPython] Silverlight: Cannot cast from 'System.Nullable`1[System.Boolean]' to 'System.Boolean'

[Michael Foord]

Jimmy Schementi wrote:
> Yay for finding a IronPython bug =) Does it work if you do IsChecked =
> None as well? Dino, do you know about this?
>

I'll try setting IsChecked to None.

Did you see that on the Mac (Safari) I'm not getting the MediaEnded
event on a MediaElement when a video stops playing? Probably not an
IronPython bug, more likely a Silverlight one. It used to work for 1.1
Alpha though (I get a CurrentStateChanged event where the state changes
to Buffering instead!).

Michael

> ~js
>
> On 5/17/08 11:46 AM, "Michael Foord" <fuzzyman at voidspace.org.uk> wrote:
>
>     This is cool. I have a checkbox in my silverlight UI.
>
>     I have a code path that does:
>
>     if self.remember_me.IsChecked:
>     PutStored(username, password)
>
>     The *second* time through this code path it blows up with the
>     exception
>     below. I can fix it by changing the test to:
>
>     if self.remember_me.IsChecked == True:
>     PutStored(username, password)
>
>     Which works fine, but I thought you might be interested. :-)
>
>     Full traceback below...
>
>     ArgumentException: Cannot cast from
>     'System.Nullable`1[System.Boolean]'
>     to 'System.Boolean'
>     ArgumentException
>     at Microsoft.Scripting.Ast.LambdaCompiler.EmitCast(Type from, Type to)
>     at Microsoft.Scripting.Ast.LambdaCompiler.Emit(UnaryExpression node)
>     at
>     Microsoft.Scripting.Ast.LambdaCompiler.EmitExpression(Expression node)
>     at Microsoft.Scripting.Ast.LambdaCompiler.Emit(BinaryExpression node)
>     at
>     Microsoft.Scripting.Ast.LambdaCompiler.EmitExpression(Expression node)
>     at Microsoft.Scripting.Ast.LambdaCompiler.EmitReturn(Expression expr)
>     at Microsoft.Scripting.Ast.LambdaCompiler.Emit(ReturnStatement node)
>     at
>     Microsoft.Scripting.Ast.LambdaCompiler.EmitExpression(Expression node)
>     at Microsoft.Scripting.Actions.StandardRule`1.Emit(LambdaCompiler cg,
>     Label ifFalse)
>     at Microsoft.Scripting.Actions.SmallRuleSet`1.MakeTarget(CodeContext
>     context)
>     at Microsoft.Scripting.Actions.RuleSet`1.GetOrMakeTarget(CodeContext
>     context)
>     at
>     Microsoft.Scripting.Actions.DynamicSiteHelpers.UpdateSite[T](CodeContext
>     callerContext, Object site, T& target, RuleSet`1& rules,
>     StandardRule`1
>     rule)
>     at
>     Microsoft.Scripting.Actions.RuleTree`1.GetRuleMaybeExecute(CodeContext
>     callerContext, Object[] args, Boolean execute, Object site, T& target,
>     RuleSet`1& rules, Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleTree`1.ExecuteRuleAndUpdateSite(CodeContext
>     callerContext, Object[] args, Object site, T& target, RuleSet`1&
>     rules,
>     Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleCache.ActionRuleCache.ExecuteRuleAndUpdateSite[T](CodeContext
>     context, Object[] args, Object site, T& target, RuleSet`1& rules,
>     Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleCache.ExecuteRuleAndUpdateSite[T](CodeContext
>     callerContext, DynamicAction action, Object[] args, Object site, T&
>     target, RuleSet`1& rules, Object& result)
>     at
>     Microsoft.Scripting.Actions.ActionBinder.UpdateSiteAndExecute[T](CodeContext
>     callerContext, DynamicAction action, Object[] args, Object site, T&
>     target, RuleSet`1& rules)
>     at
>     Microsoft.Scripting.Actions.DynamicSite`2.UpdateBindingAndInvoke(CodeContext
>     context, T0 arg0)
>     at
>     Microsoft.Scripting.Actions.DynamicSiteHelpers.UninitializedTargetHelper`7.Invoke1(DynamicSite`2
>     site, CodeContext context, T0 arg0)
>     at Microsoft.Scripting.Actions.DynamicSite`2.Invoke(CodeContext
>     context,
>     T0 arg0)
>     at _stub_##224(Closure , DynamicSite`2 , CodeContext , Object )
>     at Microsoft.Scripting.Actions.DynamicSite`2.Invoke(CodeContext
>     context,
>     T0 arg0)
>     at S$3.onLogin$18(Closure , Object self, Object sender, Object event)
>     at Microsoft.Scripting.Utils.InvokeHelper`5.Invoke(Object arg0, Object
>     arg1, Object arg2, Object arg3)
>     at Microsoft.Scripting.Utils.ReflectedCaller.InvokeInstance(Object
>     instance, Object[] args)
>     at Microsoft.Scripting.Ast.Interpreter.InvokeMethod(MethodInfo method,
>     Object instance, Object[] parameters)
>     at
>     Microsoft.Scripting.Ast.Interpreter.InterpretMethodCallExpression(CodeContext
>     context, Expression expr)
>     at Microsoft.Scripting.Ast.Interpreter.Interpret(CodeContext context,
>     Expression expr)
>     at
>     Microsoft.Scripting.Ast.Interpreter.InterpretReturnStatement(CodeContext
>     context, Expression expr)
>     at Microsoft.Scripting.Ast.Interpreter.Interpret(CodeContext context,
>     Expression expr)
>     at Microsoft.Scripting.Ast.Interpreter.Execute(CodeContext context,
>     Expression expression)
>     at Microsoft.Scripting.Actions.StandardRule`1.ExecuteTarget(Object
>     site,
>     CodeContext context, Object[] args)
>     at
>     Microsoft.Scripting.Actions.RuleTree`1.GetRuleMaybeExecute(CodeContext
>     callerContext, Object[] args, Boolean execute, Object site, T& target,
>     RuleSet`1& rules, Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleTree`1.ExecuteRuleAndUpdateSite(CodeContext
>     callerContext, Object[] args, Object site, T& target, RuleSet`1&
>     rules,
>     Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleCache.ActionRuleCache.ExecuteRuleAndUpdateSite[T](CodeContext
>     context, Object[] args, Object site, T& target, RuleSet`1& rules,
>     Object& result)
>     at
>     Microsoft.Scripting.Actions.RuleCache.ExecuteRuleAndUpdateSite[T](CodeContext
>     callerContext, DynamicAction action, Object[] args, Object site, T&
>     target, RuleSet`1& rules, Object& result)
>     at
>     Microsoft.Scripting.Actions.ActionBinder.UpdateSiteAndExecute[T](CodeContext
>     callerContext, DynamicAction action, Object[] args, Object site, T&
>     target, RuleSet`1& rules)
>     at
>     Microsoft.Scripting.Actions.DynamicSite`5.UpdateBindingAndInvoke(CodeContext
>     context, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>     at
>     Microsoft.Scripting.Actions.DynamicSiteHelpers.UninitializedTargetHelper`7.Invoke4(DynamicSite`5
>     site, CodeContext context, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>     at Microsoft.Scripting.Actions.DynamicSite`5.Invoke(CodeContext
>     context,
>     T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>     at _stub_##217(Closure , DynamicSite`4 , CodeContext , Object ,
>     Object ,
>     Object )
>     at Microsoft.Scripting.Actions.DynamicSite`4.Invoke(CodeContext
>     context,
>     T0 arg0, T1 arg1, T2 arg2)
>     at System.Void(Object, RoutedEventArgs), using
>     PythonBinder##183(Closure
>     , Object , RoutedEventArgs )
>     at System.Windows.Controls.Primitives.ButtonBase.OnClick()
>     at
>     System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs
>     e)
>     at
>     System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(Object
>     sender, MouseButtonEventArgs e)
>     at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32
>     typeIndex,
>     Delegate handlerDelegate, Object sender, Object args)
>     at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr
>     unmanagedObjArgs, Int32 argsTypeIndex, String eventName)
>     ? Hide
>     Debugging Output
>
>
>     Michael Foord
>     http://www.ironpythoninaction.com/
>
>
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