Databinding not working in WPF between elements

[moondaddy]

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.SetMyParen t(canvas1);
shpX.Width = 150;
shpX.Height = 50;
shpX.Initialize BordersAsRectan gle();
shpX.Name = "shpX";

shpX.PreviewMou seDown += new
MouseButtonEven tHandler(myElem ent_PreviewMous eDown);
shpX.PreviewMou seMove += new MouseEventHandl er(myElement_Pr eviewMouseMove) ;
shpX.MouseLeftB uttonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.Ch ildren.Add(shpX );
Canvas.SetLeft( shpX, 100);
Canvas.SetTop(s hpX, 100);

//CREATE THE 2ND CUSTOM CONTROL
myShape shpX2 = new myShape();
shpX2.SetMyPare nt(canvas1);
shpX2.Width = 150;
shpX2.Height = 50;
shpX2.Initializ eBordersAsRecta ngle();
shpX2.Name = "shpX2";

shpX2.PreviewMo useDown += new
MouseButtonEven tHandler(myElem ent_PreviewMous eDown);
shpX2.PreviewMo useMove += new MouseEventHandl er(myElement_Pr eviewMouseMove) ;
shpX2.MouseLeft ButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.Ch ildren.Add(shpX 2);
Canvas.SetLeft( shpX2, 300);
Canvas.SetTop(s hpX2, 300);

//CREATE THE LINE
Line ln = new Line();
ln.Stroke = Brushes.Red;
ln.StrokeThickn ess = 3;

//DATA BIND ONE END OF LINE TO THE 1ST CONTROL
Binding BndX1 = new Binding();
BndX1.Mode = BindingMode.One Way;
BndX1.Source = shpX.CenterX;
BindingOperatio ns.SetBinding(l n, Line.X1Property , BndX1);

Binding BndY1 = new Binding();
BndY1.Source = shpX.CenterY;
BindingOperatio ns.SetBinding(l n, 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(L ine.X2Property, BndX2);

Binding BndY2 = new Binding();
BndY2.Source = shpX2.CenterY;
ln.SetBinding(L ine.Y2Property, BndY2);
Can anyone please help help me get this running?

Thanks!


--
mo*******@noema il.noemail

[Bart Mermuys]

Hi,

"moondaddy" <mo*******@noem ail.noemailwrot e in message
news:u2******** ******@TK2MSFTN GP02.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.SetMyParen t(canvas1);
shpX.Width = 150;
shpX.Height = 50;
shpX.Initialize BordersAsRectan gle();
shpX.Name = "shpX";

shpX.PreviewMou seDown += new
MouseButtonEven tHandler(myElem ent_PreviewMous eDown);
shpX.PreviewMou seMove += new
MouseEventHandl er(myElement_Pr eviewMouseMove) ;
shpX.MouseLeftB uttonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.Ch ildren.Add(shpX );
Canvas.SetLeft( shpX, 100);
Canvas.SetTop(s hpX, 100);

//CREATE THE 2ND CUSTOM CONTROL
myShape shpX2 = new myShape();
shpX2.SetMyPare nt(canvas1);
shpX2.Width = 150;
shpX2.Height = 50;
shpX2.Initializ eBordersAsRecta ngle();
shpX2.Name = "shpX2";

shpX2.PreviewMo useDown += new
MouseButtonEven tHandler(myElem ent_PreviewMous eDown);
shpX2.PreviewMo useMove += new
MouseEventHandl er(myElement_Pr eviewMouseMove) ;
shpX2.MouseLeft ButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.Ch ildren.Add(shpX 2);
Canvas.SetLeft( shpX2, 300);
Canvas.SetTop(s hpX2, 300);

//CREATE THE LINE
Line ln = new Line();
ln.Stroke = Brushes.Red;
ln.StrokeThickn ess = 3;

//DATA BIND ONE END OF LINE TO THE 1ST CONTROL
Binding BndX1 = new Binding();
BndX1.Mode = BindingMode.One Way;
BndX1.Source = shpX.CenterX;
BindingOperatio ns.SetBinding(l n, Line.X1Property , BndX1);

Based on winforms experience i would try:

Binding BndX1 = new Binding();
BndX1.Source = shpX;
BndX1.Path = "CenterX";
BindingOperatio ns.SetBinding(l n, Line.X1Property , BndX1);

HTH,
Greetings

>
Binding BndY1 = new Binding();
BndY1.Source = shpX.CenterY;
BindingOperatio ns.SetBinding(l n, 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(L ine.X2Property, BndX2);

Binding BndY2 = new Binding();
BndY2.Source = shpX2.CenterY;
ln.SetBinding(L ine.Y2Property, BndY2);
Can anyone please help help me get this running?

Thanks!


--
mo*******@noema il.noemail

[Walter Wang [MSFT]]

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 (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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[moondaddy]

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("C enterX");

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.
"Bart Mermuys" <bm************ *@hotmail.comwr ote in message
news:ck******** **************@ phobos.telenet-ops.be...

Hi,

"moondaddy" <mo*******@noem ail.noemailwrot e in message
news:u2******** ******@TK2MSFTN GP02.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.SetMyPare nt(canvas1);
shpX.Width = 150;
shpX.Height = 50;
shpX.Initializ eBordersAsRecta ngle();
shpX.Name = "shpX";

shpX.PreviewMo useDown += new
MouseButtonEve ntHandler(myEle ment_PreviewMou seDown);
shpX.PreviewMo useMove += new
MouseEventHand ler(myElement_P reviewMouseMove );
shpX.MouseLeft ButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.C hildren.Add(shp X);
Canvas.SetLeft (shpX, 100);
Canvas.SetTop( shpX, 100);

//CREATE THE 2ND CUSTOM CONTROL
myShape shpX2 = new myShape();
shpX2.SetMyPar ent(canvas1);
shpX2.Width = 150;
shpX2.Height = 50;
shpX2.Initiali zeBordersAsRect angle();
shpX2.Name = "shpX2";

shpX2.PreviewM ouseDown += new
MouseButtonEve ntHandler(myEle ment_PreviewMou seDown);
shpX2.PreviewM ouseMove += new
MouseEventHand ler(myElement_P reviewMouseMove );
shpX2.MouseLef tButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1.C hildren.Add(shp X2);
Canvas.SetLeft (shpX2, 300);
Canvas.SetTop( shpX2, 300);

//CREATE THE LINE
Line ln = new Line();
ln.Stroke = Brushes.Red;
ln.StrokeThick ness = 3;

//DATA BIND ONE END OF LINE TO THE 1ST CONTROL
Binding BndX1 = new Binding();
BndX1.Mode = BindingMode.One Way;
BndX1.Source = shpX.CenterX;
BindingOperati ons.SetBinding( ln, Line.X1Property , BndX1);

Based on winforms experience i would try:

Binding BndX1 = new Binding();
BndX1.Source = shpX;
BndX1.Path = "CenterX";
BindingOperatio ns.SetBinding(l n, Line.X1Property , BndX1);

HTH,
Greetings

>>
Binding BndY1 = new Binding();
BndY1.Source = shpX.CenterY;
BindingOperati ons.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!


--
mo*******@noema il.noemail

[Bart Mermuys]

Hi,

"moondaddy" <mo*******@noem ail.noemailwrot e in message
news:OY******** ******@TK2MSFTN GP04.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("C enterX");

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("Center X");
BndX1.Source = shpX;
BindingOperatio ns.SetBinding(l n, 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.

>
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

>
Thanks again.
"Bart Mermuys" <bm************ *@hotmail.comwr ote in message
news:ck******** **************@ phobos.telenet-ops.be...

>Hi,

"moondaddy" <mo*******@noem ail.noemailwrot e in message
news:u2******* *******@TK2MSFT NGP02.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.SetMyPar ent(canvas1);
shpX.Width = 150;
shpX.Height = 50;
shpX.Initiali zeBordersAsRect angle();
shpX.Name = "shpX";

shpX.PreviewM ouseDown += new
MouseButtonEv entHandler(myEl ement_PreviewMo useDown);
shpX.PreviewM ouseMove += new
MouseEventHan dler(myElement_ PreviewMouseMov e);
shpX.MouseLef tButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1. Children.Add(sh pX);
Canvas.SetLef t(shpX, 100);
Canvas.SetTop (shpX, 100);

//CREATE THE 2ND CUSTOM CONTROL
myShape shpX2 = new myShape();
shpX2.SetMyPa rent(canvas1);
shpX2.Width = 150;
shpX2.Heigh t = 50;
shpX2.Initial izeBordersAsRec tangle();
shpX2.Name = "shpX2";

shpX2.Preview MouseDown += new
MouseButtonEv entHandler(myEl ement_PreviewMo useDown);
shpX2.Preview MouseMove += new
MouseEventHan dler(myElement_ PreviewMouseMov e);
shpX2.MouseLe ftButtonUp += new MouseButtonEven tHandler(MouseU pHandler);

this.canvas1. Children.Add(sh pX2);
Canvas.SetLef t(shpX2, 300);
Canvas.SetTop (shpX2, 300);

//CREATE THE LINE
Line ln = new Line();
ln.Stroke = Brushes.Red;
ln.StrokeThic kness = 3;

//DATA BIND ONE END OF LINE TO THE 1ST CONTROL
Binding BndX1 = new Binding();
BndX1.Mode = BindingMode.One Way;
BndX1.Sourc e = shpX.CenterX;
BindingOperat ions.SetBinding (ln, Line.X1Property , BndX1);

Based on winforms experience i would try:

Binding BndX1 = new Binding();
BndX1.Source = shpX;
BndX1.Path = "CenterX";
BindingOperati ons.SetBinding( ln, Line.X1Property , BndX1);

HTH,
Greetings

>>>
Binding BndY1 = new Binding();
BndY1.Sourc e = shpX.CenterY;
BindingOperat ions.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.Sourc e = shpX2.CenterX;
ln.SetBinding (Line.X2Propert y, BndX2);

Binding BndY2 = new Binding();
BndY2.Sourc e = shpX2.CenterY;
ln.SetBinding (Line.Y2Propert y, BndY2);
Can anyone please help help me get this running?

Thanks!


--
mo*******@noema il.noemail