Begginer - Binding object in XAML - WPF Discussion Boards

29-Jun-10 2:51

When you design something in XAML, no real code gets added into this Page class until compile time. Then a hidden .g.cs file is created which adds the definitions of the components in.

"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.

why wcf use basicHttpBinding instead of wsHttpBinding

ctlqt1228-Jun-10 9:44

ctlqt12

28-Jun-10 9:44

Hi all,

I found several links for this but no definitive answer. Could you please tell me the reason

Re: why wcf use basicHttpBinding instead of wsHttpBinding

Abhinav S28-Jun-10 18:35

VS2008 Doesn't Allow Debugging of Silverlight apps [SOLVED]

28-Jun-10 18:35

AFAIK, wsHttpBinding is not supported in silverlight - Silverlight supports the WS basic profile, which uses basicHttpBinding and not wsHttpBinding.

#realJSOP27-Jun-10 2:13

#realJSOP

27-Jun-10 2:13

Something happened in the last week that prevents VS2008 from being able to debug ANY Silverlight apps (non-Silverlight can still be debugged normally). Last weekend, it worked fine. I did notice there was an update to .Net 3.5 and it also pushed the .Net4 Client Profile in the latest rounds of Microsoft updates (last week) but I don't know if this is the cause.

SOLUTION ============================

I found out what was wrong - I had an out-of-date pdb file in a 3rd party folder. When I replaced it with the appropriate file, everything was fine.

modified on Monday, June 28, 2010 7:42 AM

Re: VS2008 Doesn't Allow Debugging of Silverlight apps

Abhinav S27-Jun-10 7:12

Begginer - Binding object in XAML

27-Jun-10 7:12

Maybe this can help -
Goto the web project of your SL solution, right click on it and view the project properties.
Goto the Web option and ensure the Silverlight debugger is checked.

ekimpl26-Jun-10 0:40

26-Jun-10 0:40

Hi, this thing is killing me..

I have object drag of type Field and I would like to bind it to a productsDataGrid's property Drag in XAML. In codebehind it all works well :

public class Field : INotifyPropertyChanged
 {
   ...
   public string Value
   ...
 }

public partial class MainPage : UserControl
   {
       public Field drag;

       public MainPage()
       {
           drag = new Field();
           drag.Value = "true";
           productsDataGrid.Drag = drag;

but in XAML it's not.

<cont:DragGrid Name="productsDataGrid" Drag="{Binding drag, Path=Value}"/>

How to set this binding correct ?

Pete O'Hanlon26-Jun-10 2:35

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.

Re: Begginer - Binding object in XAML [modified]

ekimpl26-Jun-10 3:28

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

Abhinav S26-Jun-10 5:53

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?

ekimpl26-Jun-10 6:08

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" ...

Abhinav S26-Jun-10 6:20

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....

ekimpl26-Jun-10 6:30

26-Jun-10 6:30

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

Pete O'Hanlon26-Jun-10 6:57

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.

ekimpl26-Jun-10 7:15

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 ?

Pete O'Hanlon26-Jun-10 9:05

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.

Abhinav S26-Jun-10 17:25

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.

ekimpl26-Jun-10 19:38

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.

Abhinav S26-Jun-10 19:54

Arrange controls inside a user control in wpf

26-Jun-10 19:54

ekimpl wrote:
So, thanks for Your help guys

You are welcome.
Smile | :)

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

Pete O'Hanlon25-Jun-10 4:00

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.

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

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]