DataContext

Question

I have an  object property. If i set DataContext throw mark up then binding dose no work

  <Grid Name="Grid2" DataContext=" strategy"

But if i do the sane in c# code then i have no problem and binding works well.

Grid1.DataContext = Grid2.DataContext = strategy;

Why? Thank you

Answer 1

hi,

i think you should give  in xaml the DataContext as follows

<Grid DataContext="{Binding Path=strategy}">

refer following link for more information

http://www.codeproject.com/Articles/321899/DataContext-in-WPF

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Thanks & Regards dhampall

Answer 2

Unfortunatly , this did not help 

Answer 3

Try this,

<Grid x:Name="Grid1"> </Grid>
<Grid x:Name="Grid2" DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Grid},Mode=FindAncestor},Path=DataContext}"></Grid>

Code Behind:(C#)

Grid1.DataContext = Strategy;

Answer 4

hi,

can you plz post your code ?

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Thanks & Regards dhampall

Answer 5

I Assume the strategy property is located in your window class,

than you need to add 

DataContext="{Binding RelativeSource={x:Static RelativeSource.Self}}"

to the window tag, and than add the 

DataContext="{Binding strategy}"

line to the grid tag.

If the strategy isn't located in your window than you need to create an instance of the class in the resource section and than bind to it.

see: http://msdn.microsoft.com/en-us/magazine/cc163299.aspx

Regards

Yoni

Answer 6

I haev strategy as member of a Window class

  public Strategy strategy=new Strategy(); 		public MainWindow()		{

And after i do this in some method of the windows class

 strategy = new Strategy(_candleManager, security, (Portfolio)Portfolios.SelectedValue, int.Parse(periodBox.Text), LotSizeValue);
                        Grid1.DataContext = Grid2.DataContext = Grid3.DataContext=strategy;

And in markup i author that 

Text = "{Binding Path=Security.LastTrade.Price}"

And it is works perfect! But how i can do this inside XAML ?

Answer 7

Hi,

I think what you are missing is setting the Window's datacontext ion the constructor

public MainWindow()

{

DataContex = this;

}

After adding this line your xaml will be able to bind to all public properties (in your case strategy) in your code behind.

Hope that helps?

Answer 8

Hi qpiles,

Strategy MUST be a public property! simply change that, and the code I provided earlier should work.

Regards

Yoni

Answer 9

Hi qpiles,

How's your problem now?

Like Yoni said, Strategy must be public. To set the DataContext in xaml, you can do this:

  xmlns:local="clr-namespace:WpfApplication1"
  <Grid.DataContext>
     <local:Strategy/>
  </Grid.DataContext>

Have a nice day,

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Kee Poppy [MSFT]
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