Re: Begginer - Binding object in XAML - WPF Discussion Boards

Re: Begginer - Binding object in XAML

Pete O'Hanlon26-Jun-10 2:35

Pete O'Hanlon

26-Jun-10 2:35

Make Value a property, not a field.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Begginer - Binding object in XAML [modified]

ekimpl26-Jun-10 3:28

ekimpl

26-Jun-10 3:28

Hi, sorry I didn't paste complete code of Field class, but Value is already a property

public class Field : INotifyPropertyChanged
  {
      private string _value;
      public string Value
      {
          get {return _value;}
          set
          {
              _value = value;
              NotifyPropertyChanged("Value");
          }

Edit: I deleted my last message, because I thought I worked the solution, so the question is still unanswered.

modified on Saturday, June 26, 2010 9:50 AM

Re: Begginer - Binding object in XAML

Abhinav S26-Jun-10 5:53

Abhinav S

26-Jun-10 5:53

ekimpl wrote:
<cont:draggrid name="productsDataGrid" drag="{Binding drag, Path=Value}">

I did not see you setting the Datacontext for the xaml anywhere.
What is it set to?

Re: Begginer - Binding object in XAML

ekimpl26-Jun-10 6:08

ekimpl

26-Jun-10 6:08

I set DataContext in LayoutRoot

<UserControl x:Class="MFP.MainPage" ..... >
<UserControl.Resources>
        <my:MainPage x:Key="mainpage"/>
    </UserControl.Resources>
    <Canvas x:Name="LayoutRoot" DataContext="mainpage" ...

Re: Begginer - Binding object in XAML

Abhinav S26-Jun-10 6:20

Abhinav S

26-Jun-10 6:20

private string _value;        <br />
public string Value        <br />
{            <br />
get {return _value;<br />
}            <br />
set            <br />
{                <br />
_value = value;                <br />
NotifyPropertyChanged("Value");            <br />
}<br />

Move the property code to mainpage and try....

Re: Begginer - Binding object in XAML

ekimpl26-Jun-10 6:30

ekimpl

26-Jun-10 6:30

But the Value property is inside of class Field, so I can't move it.

Re: Begginer - Binding object in XAML

Pete O'Hanlon26-Jun-10 6:57

Pete O'Hanlon

26-Jun-10 6:57

In order to use Value, the DataContext must be set to an instance of your Field class. That's the only way it can find it.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Begginer - Binding object in XAML

ekimpl26-Jun-10 7:15

ekimpl

26-Jun-10 7:15

I think I am missing something in XAML, because from .cs it all works ok. Let's forget about the Field class and stick to a simpler example like binding MyValue to a TextBlock.

        public String MyValue { get; set; }<br />
<br />
        public MainPage()<br />
        {<br />
            InitializeComponent();<br />
            MyValue = "test text";<br />
            txtTest.DataContext = MyValue;<br />
            .....<br />
<br />
<TextBlock Grid.Row="1" Name="txtTest" Text="{Binding}"/>

Above code works fine, but when i try to set DataContext in XAML it fails.

<TextBlock Grid.Row="1" DataContext={Binding MyValue} Name="txtTest" Text="{Binding}"/>
Fail
<TextBlock Grid.Row="1" Name="txtTest" Text="{Binding MyValue}"/>

Fail

Maybe I should add something to resources ?

Re: Begginer - Binding object in XAML

Pete O'Hanlon26-Jun-10 9:05

Pete O'Hanlon

26-Jun-10 9:05

ekimpl wrote:
Maybe I should add something to resources ?

No. Drop the DataContext from your XAML, and then add something like this in the code behind the view:

private Field _field;
private void SetContext()
{
  _field = new Field();
  DataContext = Field;
}

Then call this method from immediately after the call to InitializeComponent();

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Begginer - Binding object in XAML

Abhinav S26-Jun-10 17:25

Abhinav S

26-Jun-10 17:25

Pete O'Hanlon wrote:
No. Drop the DataContext from your XAML

He could alsways set the datacontext via the xaml.
However, here this solution is perfect.

Re: Begginer - Binding object in XAML

ekimpl26-Jun-10 19:38

ekimpl

26-Jun-10 19:38

Pete, I could use Your solution, but as I wrote, there is no problem when setting DataContext form .cs. I just wanted to find the reason why I could not bind my Properties in XAML.

And I found the reason, with Your (both Pete and Abhinav) clues. It was because my declaration of DataContext for LayoutRoot was wrong. I moved it from XAML to .cs

LayoutRoot.DataContext = this;

so now it points to my MainPage class, and now, I can bind local properties with no need to set the context for each control in XAML

public Field Val { get; set; }
<TextBlock Grid.Row="1" Name="txtTest"  Text="{Binding Val.Value}"/>

So, thanks for Your help guys, I think the problem is solved.

Re: Begginer - Binding object in XAML

Abhinav S26-Jun-10 19:54

Abhinav S

26-Jun-10 19:54

ekimpl wrote:
So, thanks for Your help guys

You are welcome.
Smile | :)

Arrange controls inside a user control in wpf

dashingsidds25-Jun-10 3:32

dashingsidds

25-Jun-10 3:32

Hi Experts,

I have a user control. I am dynamically adding controls to this user control using Children.Add. I want to change their location on some event in code. Like we can do in winform using Location. Is there anything similar to this?

Please help!
Thanks in advance!

Regards,

Samar

Re: Arrange controls inside a user control in wpf

Pete O'Hanlon25-Jun-10 4:00

Pete O'Hanlon

25-Jun-10 4:00

You could always set the Margin of the control to move/size it. Without knowing what exactly you are trying to achieve, it's hard to add any more detail.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Arrange controls inside a user control in wpf

dashingsidds27-Jun-10 18:33

dashingsidds

27-Jun-10 18:33

Hi,

I think i was a little too generic in explaining my problem. I will give my current scenario.

I am trying to build an MDI in WPF. As you know there is no concept of MDI in WPF but i got a simulated MDI code from codeplex. The link for the same is given here. Now i want to tile the child controls in the mdi either horizontally, vertically or cascade in the way similar to windows MDI like this.LayoutMdi(MdiLayout.TileHorizontal);.

Please help!
Thanks in advance.

Regards,

Samar

Re: Arrange controls inside a user control in wpf

BechBej5-Jul-10 10:01

BechBej

5-Jul-10 10:01

Did you mean something like this?

[code]
<Canvas>
<Rectangle Width="50" Height="50" Fill="Red"
Canvas.Left="50" Canvas.Top="50">
</Rectangle>
</Canvas>[/code]
Try to copy and paste this in a blanc scene, it that what you want then you can also do this in code behind

[code]Rectangle rect = new Rectangle {
Width = 50,
Height = 50,
Fill = new SolidColorBrush(Colors.Blue) };

Canvas.SetLeft(rect, 50);
Canvas.SetTop(rect,50); [/code]

Re: Arrange controls inside a user control in wpf

dashingsidds5-Jul-10 18:23

dashingsidds

5-Jul-10 18:23

Yeah something on the similar lines. I got the solution as.

uc1.SetValue(Canvas.TopProperty, Convert.ToDouble(12));
uc1.SetValue(Canvas.LeftProperty, Convert.ToDouble(12));

The above will move the usercontrol uc1 12 from the top and 12 from the left. Thanks. Smile | :)

Regards,

Samar

Removing line-geometry from screen at run-time

industryunleash25-Jun-10 3:15

industryunleash

25-Jun-10 3:15

Hi, I've been playing around with the code found at this website: http://dvuyka.spaces.live.com/blog/cns!305B02907E9BE19A!171.entry
It uses thumbs for dragging and LineGeometries for drawing connections between them. I was wondering if and how one would go about removing these at runtime, such as by right-clicking on them.

Thanks!

Re: Removing line-geometry from screen at run-time

Pete O'Hanlon25-Jun-10 3:27

Pete O'Hanlon

25-Jun-10 3:27

Find the link item that you want in the child collection and remove it.

connectors.Children.Remove(link);

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Removing line-geometry from screen at run-time

industryunleash25-Jun-10 3:30

industryunleash

25-Jun-10 3:30

Well i figured out that part, but my question is more of how to find the link item in the child connection from a mouse click. Is that possible?

Re: Removing line-geometry from screen at run-time

Pete O'Hanlon25-Jun-10 3:41

Pete O'Hanlon

25-Jun-10 3:41

Without going through the code in depth, I'd imagine that the Link object would have an IsSelected property available on it - it should be a simple enough. If it doesn't, you'll need to perform a hit test (typically in the OnMouseLeftButtonDown event handler:

Point pt = e.GetPosition((UIElement)sender);
HitTestResult result = VisualTreeHelper.HitTest(canvas, pt);
if (result != null)
{
  LineGeometry line = result.VisualHit as LineGeometry;
}

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Removing line-geometry from screen at run-time

industryunleash30-Jun-10 7:47

industryunleash

30-Jun-10 7:47

i keep getting result as null when i click on the LineGeometry/Path

DataGrid Focusing Issue,

Hema Bairavan25-Jun-10 1:34

Hema Bairavan

25-Jun-10 1:34

Hi all,

i have a issue in focusing the datagrid in WPF.

Its a data entry form in which,
the datagrid will be filled w.r. to a text box.
that is i am having one text box, upon entering some values in the text box and after clicking the tab(lost focus) the data grid will get filled.
i have given the tab index as
Text box -1
datagrid - 2
button - 3.

But now when i press tab from the text box the tab focus is going to button and not the datagrid.

the focus is coming to the datagrid after completion tab's of all tab enabled control in my form.

Any idea to fix this issue?

thanks in advacne

How to deploy silver light + wcf application in IIS

Destinys_child24-Jun-10 21:10

Destinys_child

24-Jun-10 21:10

I am new to silver light ..i am using IIS 5.1 and silver light 3.0 . How to deploy ...please help!

Re: How to deploy silver light + wcf application in IIS

Abhinav S24-Jun-10 23:20

Abhinav S

24-Jun-10 23:20

There are quite a few articles on this topic available on the internet.

See here for starters.

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