WPF Discussion Boards

Re: datagrid2 within datagrid1

13-Dec-10 7:46

Yes

Abhinav S14-Dec-10 3:30

ListView populating question

14-Dec-10 3:30

If not, then I have misunderstood your question.

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Richard Andrew x6412-Dec-10 9:07

Richard Andrew x64

12-Dec-10 9:07

If I have a dynamically created OdbcDataReader, how do I hook it to the ListView in order to display the contents?

I already have the columns defined, and I just want to display the records from the data reader.

The difficult we do right away...
...the impossible takes slightly longer.

Re: ListView populating question

Richard Andrew x6412-Dec-10 16:01

Richard Andrew x64

12-Dec-10 16:01

I figured it out:

Set the ListView.ItemsSource to the DataReader, and in XAML, set the Binding Path property of each column to its associated database field name.

The difficult we do right away...
...the impossible takes slightly longer.

Re: ListView populating question

Mycroft Holmes12-Dec-10 18:02

Mycroft Holmes

12-Dec-10 18:02

Richard Andrew x64 wrote:
Set the ListView.ItemsSource to the DataReader

I would consider this dangerous as the data reader locks the connection to the database while it is in scope, therefore you should move your data to an List<> of objects and bind that list to the xaml.

Your UI should be separated from your database object.

Never underestimate the power of human stupidity
RAH

Re: ListView populating question

Richard Andrew x6413-Dec-10 4:16

Richard Andrew x64

13-Dec-10 4:16

Thanks, I changed it to be just as you said. Thumbs Up | :thumbsup:

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...the impossible takes slightly longer.

pixels protected error domain

geoderek9-Dec-10 11:35

geoderek

9-Dec-10 11:35

Hello,

I have a silverlight application which is hosted within a WCF for purposes of getting at the data access layer. I am trying to convert a UI element on the silverlight side to an image using WriteableBitmap. However whenever I hit .pixels I get a protected error. Most of my research is telling me that this is a cross domain issue, but the WCF is hosted within the WCF and shouldn't that mean they are on the same domain.

Thanks so much for any feed back you can give.

Thanks,
Derek

Re: pixels protected error domain

Abhinav S9-Dec-10 18:38

Re: pixels protected error domain

9-Dec-10 18:38

You will need the client access policy or crossdomain file.

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geoderek12-Dec-10 5:08

geoderek

12-Dec-10 5:08

Hello,

I do have these files on the root of the WCF project. And just to be sure I also put them in the root of inetpub www. But I still get the erro: "WriteableBitmap has protected content. Pixel access is not allowed."

Is it possible that these files are not being utilized?

Thanks,
Derek

Re: pixels protected error domain

Abhinav S12-Dec-10 18:10

silverlight 4 - datagrid selectionchanged

12-Dec-10 18:10

geoderek wrote:
Is it possible that these files are not being utilized?

This might be a security issue.
If you run this project with elevated permissions, it might work.

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arkiboys9-Dec-10 4:45

9-Dec-10 4:45

How is it possible to stop the selectionchanged event to get fired the first time the grid is loaded with data?

#realJSOP9-Dec-10 23:46

#realJSOP

9-Dec-10 23:46

Set up a way to eat the event during databinding?

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arkiboys10-Dec-10 1:26

10-Dec-10 1:26

Not sure what else to do as I have tried -= and +=
Any further thoughts please?

Mycroft Holmes9-Dec-10 23:54

Mycroft Holmes

9-Dec-10 23:54

A slightly more detailed response with the same concept that JSOP offered.

Set a bool (bLoading) in the constructor of the view
in the event check for the bool setting and ignore if bLoading == true
set bLoading to false at the end of the constructor.

Caveat I do this in winforms and assume it works in SL, I have not yet needed it in SL

Never underestimate the power of human stupidity
RAH

arkiboys10-Dec-10 1:29

10-Dec-10 1:29

That will not work because the onstructor only gets called once.

Mycroft Holmes10-Dec-10 12:05

Mycroft Holmes

10-Dec-10 12:05

Then you need to locate the method that populates the grid, probably the onchange event on your list and use the same logic.

Never underestimate the power of human stupidity
RAH

arkiboys10-Dec-10 22:26

datagrid issue [modified]

10-Dec-10 22:26

The section which populate sthe grid is in the load events.
Please look at my earlier post to see the code events I am using.
Still having t he same problems...

arkiboys9-Dec-10 3:13

image control - dynamic load image from the resource file

9-Dec-10 3:13

I am working on an existing silverlight 4 application.
main page is MainPage.xaml
This page has a main datagrid i.e. datagrid1 and another datagrid i.e. datagrid2 which is inside the datagrid1.

When the application is run, the datagrid1 is populated with data.
Everytime you click on a row in datagrid1, then the datagrid2 is shown and is loaded with data.

Problems is everytime the datagrid1 is loaded, i.e. when th emainpage.xaml is run, then datagrid2 gets shown in the first row of datagrid1.
How can I stop the datagrid2 being shown when the mainpage.xaml is loaded?

I think somehow I have to get the -= and += code to work. You see them above where they are commented because they do not compile.

Any thoughts please?

for datagrid1 I am using the following events with codes inside them:

private void datagrid1_Loaded(object sender, RoutedEventArgs e)
{
//this.datagrid1.SelectionChanged -= new EventHandler(this.datagrid1_SelectionChanged);
this.DataContext = ((MainPage)(Application.Current.RootVisual)).GetData;
//this.datagrid1.SelectionChanged -= new EventHandler(this.datagrid1_SelectionChanged);
}

private void datagrid1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (datagrid1.RowDetailsVisibilityMode == DataGridRowDetailsVisibilityMode.Collapsed && e.RemovedItems.Count == 1)
datagrid1.RowDetailsVisibilityMode = DataGridRowDetailsVisibilityMode.VisibleWhenSelected;
}

private void datagrid_RowDetailsVisibilityChanged(object sender, DataGridRowDetailsEventArgs e)
{
if (e.Row.DetailsVisibility == Visibility.Collapsed) return;

if (e.Row.DataContext is myservice.myData)
{
//retrieve data

}
}

Thanks

modified on Thursday, December 9, 2010 9:49 AM

Yanshof9-Dec-10 2:27

Yanshof

9-Dec-10 2:27

I create in the code some image control and i want to set on this image control some of the picture that i saved ( load those pictures before creating the image control )

How can i do it ?

Re: image control - dynamic load image from the resource file

Praveen Raghuvanshi9-Dec-10 3:15

Praveen Raghuvanshi

9-Dec-10 3:15

Try this

http://www.comanswer.com/question/dynamic-loading-of-images-in-wpf[^]

Hope this helps!

Praveen Raghuvanshi
Software Engineer,

India.

designer .xaml error

arkiboys8-Dec-10 23:43

8-Dec-10 23:43

Hi,
I am unable to reload the designer for a .xaml page.
I get the error:
An unhandled Exception has occured.
System.InvalidOperationException
An unhandled exception was encountered while trying to render the current silverlight project on the design surface. To diagnose this failure, please try to run the project in a regular browser using the silverlight developer runtime.

Further down the error message it says:
System.InvalidCastException
Unable to cast object of type 'System.Windows.Controls.Canvas' to type 'myprojectname.Silverlight.MainPage'.

Any thoughts please?
Thanks

Re: designer .xaml error

Vimalsoft(Pty) Ltd9-Dec-10 4:19

Vimalsoft(Pty) Ltd

9-Dec-10 4:19

let us see you xaml

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error in xaml resource

arkiboys8-Dec-10 21:46

Re: error in xaml resource

8-Dec-10 21:46

Hi,
In xaml, There is an underline on {TemplateBinding Content} in the following script:
The error is: Property 'Content' was not found in type 'Control'
Do y ou see why?
Note that I can compile but not sure why I get this underline.
Any thoughts please?
Thanks

<UserControl.Resources>
...
...
...
<ControlTemplate x:Key="ToolTipTemplate">
<Border BorderBrush="red" BorderThickness="5" CornerRadius="1" Background="blue">
<ContentPresenter Grid.Column="3"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="1,1,1,1"/>
</Border>
</ControlTemplate>
</UserControl.Resources>

Abhinav S8-Dec-10 22:01