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dotnet general
group:Databinding not working in WPF between elements
dotnet general:
I'm trying to databind a dependency property in a custom control (CenterX)
to the Line.X1Property property of line. If I can correctly do this (and the same for the 'Y' props) then when I drag my custom control the line should follow it (stay connected) I know the dependency props in my custom control work OK because all works OK when I do this in xaml, but when I try to set it up at run time via c# in the codebehind, the line does not stay connected to the custom control. Here's the code that creates 2 instances of the custom control (myShape) and a line. When this code runs it creates all 3 objects and correctly connects the line to each custom control. but when I drag the controls the line doesn't stay connected. //CREATE THE 1ST CONTROL myShape shpX = new myShape(); shpX.SetMyParent(canvas1); shpX.Width = 150; shpX.Height = 50; shpX.InitializeBordersAsRectangle(); shpX.Name = "shpX"; shpX.PreviewMouseDown += new MouseButtonEventHandler(myElement_PreviewMouseDown); shpX.PreviewMouseMove += new MouseEventHandler(myElement_PreviewMouseMove); shpX.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); this.canvas1.Children.Add(shpX); Canvas.SetLeft(shpX, 100); Canvas.SetTop(shpX, 100); //CREATE THE 2ND CUSTOM CONTROL myShape shpX2 = new myShape(); shpX2.SetMyParent(canvas1); shpX2.Width = 150; shpX2.Height = 50; shpX2.InitializeBordersAsRectangle(); shpX2.Name = "shpX2"; shpX2.PreviewMouseDown += new MouseButtonEventHandler(myElement_PreviewMouseDown); shpX2.PreviewMouseMove += new MouseEventHandler(myElement_PreviewMouseMove); shpX2.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); this.canvas1.Children.Add(shpX2); Canvas.SetLeft(shpX2, 300); Canvas.SetTop(shpX2, 300); //CREATE THE LINE Line ln = new Line(); ln.Stroke = Brushes.Red; ln.StrokeThickness = 3; //DATA BIND ONE END OF LINE TO THE 1ST CONTROL Binding BndX1 = new Binding(); BndX1.Mode = BindingMode.OneWay; BndX1.Source = shpX.CenterX; BindingOperations.SetBinding(ln, Line.X1Property, BndX1); Binding BndY1 = new Binding(); BndY1.Source = shpX.CenterY; BindingOperations.SetBinding(ln, Line.Y1Property, BndY1); //DATA BIND THE 2ND END OF THE LINE TO THE 2ND CONTROL // I USED 'SETBINDING' IN A DIFFERENT WAY HERE TO SEE IF IT MADE A DIFFERENCE. // BOTH WAYS WORKED THE SAME. Binding BndX2 = new Binding(); BndX2.Source = shpX2.CenterX; ln.SetBinding(Line.X2Property, BndX2); Binding BndY2 = new Binding(); BndY2.Source = shpX2.CenterY; ln.SetBinding(Line.Y2Property, BndY2); Can anyone please help help me get this running? Thanks! -- moondaddy@noemail.noemail
Hi,
[quoted text, click to view] "moondaddy" <moondaddy@noemail.noemail> wrote in message news:u2oc1cyKHHA.4912@TK2MSFTNGP02.phx.gbl... > I'm trying to databind a dependency property in a custom control (CenterX) > to the Line.X1Property property of line. If I can correctly do this (and > the same for the 'Y' props) then when I drag my custom control the line > should follow it (stay connected) I know the dependency props in my > custom control work OK because all works OK when I do this in xaml, but > when I try to set it up at run time via c# in the codebehind, the line > does not stay connected to the custom control. > > Here's the code that creates 2 instances of the custom control (myShape) > and a line. When this code runs it creates all 3 objects and correctly > connects the line to each custom control. but when I drag the controls > the line doesn't stay connected. > > > //CREATE THE 1ST CONTROL > myShape shpX = new myShape(); > shpX.SetMyParent(canvas1); > shpX.Width = 150; > shpX.Height = 50; > shpX.InitializeBordersAsRectangle(); > shpX.Name = "shpX"; > > shpX.PreviewMouseDown += new > MouseButtonEventHandler(myElement_PreviewMouseDown); > shpX.PreviewMouseMove += new > MouseEventHandler(myElement_PreviewMouseMove); > shpX.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); > > this.canvas1.Children.Add(shpX); > Canvas.SetLeft(shpX, 100); > Canvas.SetTop(shpX, 100); > > //CREATE THE 2ND CUSTOM CONTROL > myShape shpX2 = new myShape(); > shpX2.SetMyParent(canvas1); > shpX2.Width = 150; > shpX2.Height = 50; > shpX2.InitializeBordersAsRectangle(); > shpX2.Name = "shpX2"; > > shpX2.PreviewMouseDown += new > MouseButtonEventHandler(myElement_PreviewMouseDown); > shpX2.PreviewMouseMove += new > MouseEventHandler(myElement_PreviewMouseMove); > shpX2.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); > > this.canvas1.Children.Add(shpX2); > Canvas.SetLeft(shpX2, 300); > Canvas.SetTop(shpX2, 300); > > //CREATE THE LINE > Line ln = new Line(); > ln.Stroke = Brushes.Red; > ln.StrokeThickness = 3; > > //DATA BIND ONE END OF LINE TO THE 1ST CONTROL > Binding BndX1 = new Binding(); > BndX1.Mode = BindingMode.OneWay; > BndX1.Source = shpX.CenterX; > BindingOperations.SetBinding(ln, Line.X1Property, BndX1); Based on winforms experience i would try: Binding BndX1 = new Binding(); BndX1.Source = shpX; BndX1.Path = "CenterX"; BindingOperations.SetBinding(ln, Line.X1Property, BndX1); HTH, Greetings [quoted text, click to view] > > Binding BndY1 = new Binding(); > BndY1.Source = shpX.CenterY; > BindingOperations.SetBinding(ln, Line.Y1Property, BndY1); > > //DATA BIND THE 2ND END OF THE LINE TO THE 2ND CONTROL > // I USED 'SETBINDING' IN A DIFFERENT WAY HERE TO SEE IF IT MADE A > DIFFERENCE. > // BOTH WAYS WORKED THE SAME. > Binding BndX2 = new Binding(); > BndX2.Source = shpX2.CenterX; > ln.SetBinding(Line.X2Property, BndX2); > > Binding BndY2 = new Binding(); > BndY2.Source = shpX2.CenterY; > ln.SetBinding(Line.Y2Property, BndY2); > > > Can anyone please help help me get this running? > > Thanks! > > > > > -- > moondaddy@noemail.noemail >
Hi,
I'm not sure if I fully understand your question. Would you please send me the working XAML version and the not-working code-behind version so that I can debug it on my side? Thanks. Sincerely, Walter Wang (wawang@online.microsoft.com, remove 'online.') Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. If you are using Outlook Express, please make sure you clear the check box "Tools/Options/Read: Get 300 headers at a time" to see your reply promptly. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights.
Thanks but that didnt seem to have any effect. One line didnt compile which
I changed from: BndX1.Path = "CenterX"; to BndX1.Path = new PropertyPath("CenterX"); I'm going to send Walter a cleaned up sample of this in a response to his post below if you want to take a look at it. Thanks again. [quoted text, click to view] "Bart Mermuys" <bmermuys.nospam@hotmail.com> wrote in message news:ckvlh.264408$mo5.5439581@phobos.telenet-ops.be... > Hi, > > "moondaddy" <moondaddy@noemail.noemail> wrote in message > news:u2oc1cyKHHA.4912@TK2MSFTNGP02.phx.gbl... >> I'm trying to databind a dependency property in a custom control >> (CenterX) to the Line.X1Property property of line. If I can correctly >> do this (and the same for the 'Y' props) then when I drag my custom >> control the line should follow it (stay connected) I know the dependency >> props in my custom control work OK because all works OK when I do this in >> xaml, but when I try to set it up at run time via c# in the codebehind, >> the line does not stay connected to the custom control. >> >> Here's the code that creates 2 instances of the custom control (myShape) >> and a line. When this code runs it creates all 3 objects and correctly >> connects the line to each custom control. but when I drag the controls >> the line doesn't stay connected. >> >> >> //CREATE THE 1ST CONTROL >> myShape shpX = new myShape(); >> shpX.SetMyParent(canvas1); >> shpX.Width = 150; >> shpX.Height = 50; >> shpX.InitializeBordersAsRectangle(); >> shpX.Name = "shpX"; >> >> shpX.PreviewMouseDown += new >> MouseButtonEventHandler(myElement_PreviewMouseDown); >> shpX.PreviewMouseMove += new >> MouseEventHandler(myElement_PreviewMouseMove); >> shpX.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); >> >> this.canvas1.Children.Add(shpX); >> Canvas.SetLeft(shpX, 100); >> Canvas.SetTop(shpX, 100); >> >> //CREATE THE 2ND CUSTOM CONTROL >> myShape shpX2 = new myShape(); >> shpX2.SetMyParent(canvas1); >> shpX2.Width = 150; >> shpX2.Height = 50; >> shpX2.InitializeBordersAsRectangle(); >> shpX2.Name = "shpX2"; >> >> shpX2.PreviewMouseDown += new >> MouseButtonEventHandler(myElement_PreviewMouseDown); >> shpX2.PreviewMouseMove += new >> MouseEventHandler(myElement_PreviewMouseMove); >> shpX2.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); >> >> this.canvas1.Children.Add(shpX2); >> Canvas.SetLeft(shpX2, 300); >> Canvas.SetTop(shpX2, 300); >> >> //CREATE THE LINE >> Line ln = new Line(); >> ln.Stroke = Brushes.Red; >> ln.StrokeThickness = 3; >> >> //DATA BIND ONE END OF LINE TO THE 1ST CONTROL >> Binding BndX1 = new Binding(); >> BndX1.Mode = BindingMode.OneWay; >> BndX1.Source = shpX.CenterX; >> BindingOperations.SetBinding(ln, Line.X1Property, BndX1); > > Based on winforms experience i would try: > > Binding BndX1 = new Binding(); > BndX1.Source = shpX; > BndX1.Path = "CenterX"; > BindingOperations.SetBinding(ln, Line.X1Property, BndX1); > > HTH, > Greetings > >> >> Binding BndY1 = new Binding(); >> BndY1.Source = shpX.CenterY; >> BindingOperations.SetBinding(ln, Line.Y1Property, BndY1); >> >> //DATA BIND THE 2ND END OF THE LINE TO THE 2ND CONTROL >> // I USED 'SETBINDING' IN A DIFFERENT WAY HERE TO SEE IF IT MADE A >> DIFFERENCE. >> // BOTH WAYS WORKED THE SAME. >> Binding BndX2 = new Binding(); >> BndX2.Source = shpX2.CenterX; >> ln.SetBinding(Line.X2Property, BndX2); >> >> Binding BndY2 = new Binding(); >> BndY2.Source = shpX2.CenterY; >> ln.SetBinding(Line.Y2Property, BndY2); >> >> >> Can anyone please help help me get this running? >> >> Thanks! >> >> >> >> >> -- >> moondaddy@noemail.noemail >> > >
Hi,
[quoted text, click to view] "moondaddy" <moondaddy@noemail.noemail> wrote in message news:OYzet6DMHHA.1872@TK2MSFTNGP04.phx.gbl... > Thanks but that didnt seem to have any effect. One line didnt compile > which I changed from: > BndX1.Path = "CenterX"; > to > BndX1.Path = new PropertyPath("CenterX"); Yeah, sorry for that, new to WPF. I still believe the path thing is necessairly... Most SDK doc examples setup the path in the binding ctor: Binding BndX1 = new Binding("CenterX"); BndX1.Source = shpX; BindingOperations.SetBinding(ln, Line.X1Property, BndX1); Though i doubt this will make any difference from what you already tried. You did mention that it worked when binding in XAML, that would indicate that there's nothing wrong with your shape class, so it would be good to see how you got it working using XAML. [quoted text, click to view] > > I'm going to send Walter a cleaned up sample of this in a response to his > post below if you want to take a look at it. If you want you may mail me that sample too. Greetings [quoted text, click to view] > > Thanks again. > > > "Bart Mermuys" <bmermuys.nospam@hotmail.com> wrote in message > news:ckvlh.264408$mo5.5439581@phobos.telenet-ops.be... >> Hi, >> >> "moondaddy" <moondaddy@noemail.noemail> wrote in message >> news:u2oc1cyKHHA.4912@TK2MSFTNGP02.phx.gbl... >>> I'm trying to databind a dependency property in a custom control >>> (CenterX) to the Line.X1Property property of line. If I can correctly >>> do this (and the same for the 'Y' props) then when I drag my custom >>> control the line should follow it (stay connected) I know the >>> dependency props in my custom control work OK because all works OK when >>> I do this in xaml, but when I try to set it up at run time via c# in the >>> codebehind, the line does not stay connected to the custom control. >>> >>> Here's the code that creates 2 instances of the custom control (myShape) >>> and a line. When this code runs it creates all 3 objects and correctly >>> connects the line to each custom control. but when I drag the controls >>> the line doesn't stay connected. >>> >>> >>> //CREATE THE 1ST CONTROL >>> myShape shpX = new myShape(); >>> shpX.SetMyParent(canvas1); >>> shpX.Width = 150; >>> shpX.Height = 50; >>> shpX.InitializeBordersAsRectangle(); >>> shpX.Name = "shpX"; >>> >>> shpX.PreviewMouseDown += new >>> MouseButtonEventHandler(myElement_PreviewMouseDown); >>> shpX.PreviewMouseMove += new >>> MouseEventHandler(myElement_PreviewMouseMove); >>> shpX.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); >>> >>> this.canvas1.Children.Add(shpX); >>> Canvas.SetLeft(shpX, 100); >>> Canvas.SetTop(shpX, 100); >>> >>> //CREATE THE 2ND CUSTOM CONTROL >>> myShape shpX2 = new myShape(); >>> shpX2.SetMyParent(canvas1); >>> shpX2.Width = 150; >>> shpX2.Height = 50; >>> shpX2.InitializeBordersAsRectangle(); >>> shpX2.Name = "shpX2"; >>> >>> shpX2.PreviewMouseDown += new >>> MouseButtonEventHandler(myElement_PreviewMouseDown); >>> shpX2.PreviewMouseMove += new >>> MouseEventHandler(myElement_PreviewMouseMove); >>> shpX2.MouseLeftButtonUp += new MouseButtonEventHandler(MouseUpHandler); >>> >>> this.canvas1.Children.Add(shpX2); >>> Canvas.SetLeft(shpX2, 300); >>> Canvas.SetTop(shpX2, 300); >>> >>> //CREATE THE LINE >>> Line ln = new Line(); >>> ln.Stroke = Brushes.Red; >>> ln.StrokeThickness = 3; >>> >>> //DATA BIND ONE END OF LINE TO THE 1ST CONTROL >>> Binding BndX1 = new Binding(); >>> BndX1.Mode = BindingMode.OneWay; >>> BndX1.Source = shpX.CenterX; >>> BindingOperations.SetBinding(ln, Line.X1Property, BndX1); >> >> Based on winforms experience i would try: >> >> Binding BndX1 = new Binding(); >> BndX1.Source = shpX; >> BndX1.Path = "CenterX"; >> BindingOperations.SetBinding(ln, Line.X1Property, BndX1); >> >> HTH, >> Greetings >> >>> >>> Binding BndY1 = new Binding(); >>> BndY1.Source = shpX.CenterY; >>> BindingOperations.SetBinding(ln, Line.Y1Property, BndY1); >>> >>> //DATA BIND THE 2ND END OF THE LINE TO THE 2ND CONTROL >>> // I USED 'SETBINDING' IN A DIFFERENT WAY HERE TO SEE IF IT MADE A >>> DIFFERENCE. >>> // BOTH WAYS WORKED THE SAME. >>> Binding BndX2 = new Binding(); >>> BndX2.Source = shpX2.CenterX; >>> ln.SetBinding(Line.X2Property, BndX2); >>> >>> Binding BndY2 = new Binding(); >>> BndY2.Source = shpX2.CenterY; >>> ln.SetBinding(Line.Y2Property, BndY2); >>> >>> >>> Can anyone please help help me get this running? >>> >>> Thanks! >>> >>> >>> >>> >>> -- >>> moondaddy@noemail.noemail >>> >> >> > >
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