WPF Discussion Boards

GETTING THIS ERROR IN SILVERLIGHT CHAT PROJECT

18-Aug-10 4:31

Hmm... Off the top of my head, I think this could be solved with a couple attached properties...

Not sure how familiar you are with them, but attached properties in WPF are basically properties that are based on one class, but can actually apply to any DependencyObject of a given base type. They're most similar to the IExtenderProvider functionality in WinForms, except that they can ALSO inherit to child objects... So if you set the value on the TabItem, then all of its children can read that value too, as if it was on each of them.

1) Create two attached properties:

- a) ParentTabName, with a type of TabItem. For each tab, bind that property to the tab name ({Binding TabName,RelativeSource={RelativeSource Self}} if memory serves).

- b) TabVisibilityCodes, with a type of string. For each child control that needs to be shown/hidden, set that property to, say, a comma-delimited list of the names of tabs it should be shown on. All of this can be done in XAML once the properties are created.

2) In the setter for either property (The getters/setters are all in one place, not on each object), compare the two attached properties for the element in question, and update its visibility accordingly.

Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)

kibok17-Aug-10 6:36

kibok

17-Aug-10 6:36

int _result = ((int)(base.EndInvoke("UserExist", _args, result)));

WHEN I TRY TO LOGIN
USING VS 2010 PRO/SQL DEVELOPER R2

Re: GETTING THIS ERROR IN SILVERLIGHT CHAT PROJECT

Abhinav S17-Aug-10 18:38

WPF: Converting nested DrawingGroup to nested DrawingVisual [modified]

17-Aug-10 18:38

What's the error?

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick - Silverlight *.XCP files.

Visit the Hindi forum here.

Paul Selormey16-Aug-10 19:57

Paul Selormey

16-Aug-10 19:57

Hello,
I have a DrawingGroup with nested children created from SVG files and want to render/convert this a corresponding nested DrawingVisual/Visual.

A simple rendering process as follows...

DrawingGroup group; // assuming root group of diagrams
DrawingVisual visual = new DrawingVisual();

visual.DrawDrawing(group);

will correctly render the drawing graph, but the resulting visual does not contain any child visual, only a single visual with no child is created.

The children of the root drawing may also have children with transform(s), which is the may cause of my current failed attempt.

I need the nested visual to perform interactive operations. Anyone done a similar thing and will not mind to share his/her algorithm?

Paul.

Jesus Christ is LOVE! Please tell somebody.

modified on Tuesday, August 17, 2010 2:03 AM

Custom Rendering Ink

Tony Honter16-Aug-10 5:32

Tony Honter

16-Aug-10 5:32

I used the custom Rendering Ink to build a custom brush. I create a customized dynamic renderer that derives from the DynamicRenderer and override the OnDraw method. In OnDraw method, i need to do a lot of drawEllipse(). After that, the computer becomes very slow. Guys, do you have any solutions about that?

Thanks a lot!

htmlpage.window.navigation help

yogesh_kumar_agarwal16-Aug-10 4:40

yogesh_kumar_agarwal

16-Aug-10 4:40

Dear All,

I have a Page name first.aspx, from where i click on go to second.aspx. This second.aspx page has silverlight object.

In silverlight object i use

System.Windows.Browser.HtmlPage.Window.Navigate(New Uri(strUrl, UriKind.RelativeOrAbsolute), "_self", "")

to come back to first.aspx, but it works like back button of browser, means this page not showing the updates i have done in second.aspx. I have to refresh the first.aspx to see the new changes.

So how could i navigate to the page with page refresh in silverlight.

Thanks

Re: htmlpage.window.navigation help

yogesh_kumar_agarwal18-Aug-10 20:40

yogesh_kumar_agarwal

18-Aug-10 20:40

HI All,

I got the solution for the same. Sharing with u

HtmlPage.Window.Eval(String.Format("window.location.href='{0}';", strUrl))

Thanks

How to bind data for wpf datagridcombobox column in browser application

krajasekhar216-Aug-10 3:08

krajasekhar2

16-Aug-10 3:08

Hi,

I am working on WPF browser application. i am facing below issue

how to bind different tables to wpf datagrid combobox column ?
i have wpf datagrid, in that grid 2 combo box columns are there , 1 st column is Country and second column is state, both are datagridcombo box columns only, here depend on the country column i need bind diffrent table to state column. so each row i need to bind different table to state column . so how to achieve this task?

Thanks
Sekhar

How can i add simple .net control (net wpf control ) into wpf window ?

Yanshof14-Aug-10 21:47

Yanshof

14-Aug-10 21:47

I have some simple .net control that i want to add into wpf window.
i trying to add it by using "choose toolbox item" that appear on the IDE - but i dont see the item => so i can't add the object to my WPF window.

How cani do it ?

Thanks for any help.

Re: How can i add simple .net control (net wpf control ) into wpf window ?

Abhinav S14-Aug-10 22:37

Re: How can i add simple .net control (net wpf control ) into wpf window ?

14-Aug-10 22:37

If you control is not a WPF control, this may not be possible.

Yanshof14-Aug-10 22:43

Yanshof

14-Aug-10 22:43

The control is .net but not WPF

is it possible in this case ?
If its possible - so how can i do it ?

Thanks

Re: How can i add simple .net control (net wpf control ) into wpf window ?

Abhinav S15-Aug-10 0:49

Re: How can i add simple .net control (net wpf control ) into wpf window ?

15-Aug-10 0:49

Yanshof wrote:
If its possible - so how can i do it ?

It is possible.
See any of these to check if they help.

Here[^] or here[^].

Yanshof15-Aug-10 0:58

Yanshof

15-Aug-10 0:58

Thanks.

Re: How can i add simple .net control (net wpf control ) into wpf window ?

Abhinav S15-Aug-10 0:58

Playing a list of files on after the other.

15-Aug-10 0:58

You are welcome.
Smile | :)

Tichaona J13-Aug-10 12:29

Tichaona J

13-Aug-10 12:29

Hi
Currently I have written my application to play one media file at a time:

1. Open file dialog is used to select a file
2. File is copied into the media source. mediaElement1.source = (new Uri(file))
3. Then it is played from start to end. mediaElement1.Play();

This works fine, however now I would like to play files which have been loaded into a list box one after the other. I have tried using the foreach loop to attempt to access each file by its index and well looking through the code (using F11) found that all that happened was it would try and load all the files one after the other with out waiting for the current file to complete playing. How do I get it to wait until the current file has finished playing? here is the code that has gone wrong:

int x = lstBx.Items.Count;
for(int i = 0; i<=x; ++1)
{
string cMedia = lstBx.Items[i]as string;
mediaElement1.Source = (new Uri(cMedia));
mediaElement1.Play();
}

Also bearing in mind that the ideal condition for the media element to have completed playing a file is: mediaElement1.Position == mediaElement1.Position.Totalseconds

Please note that the application is being developed under WPF.

Re: Playing a list of files on after the other.

#realJSOP14-Aug-10 0:09

#realJSOP

14-Aug-10 0:09

You can set an event handler for the Completed event on your mediaElement. When that event is fired, load the next file and play it.

Binding ComboBox Selected Item value

BRShroyer13-Aug-10 5:01

13-Aug-10 5:01

I have been working on this for a day or two and can't seem to find the answer on the internet, or at least I don't get the answer if I have seen it.

I have a window showing various settings for an object:

<Grid x:Name="PalletGrid">
  <Grid.DataContext><XmlDataProvider x:Name="xmlPalletConfiguration" XPath="/PalletConfig/Pallets/Pallet" 
                                     Source="C:\ProgramData\Pallet Configuration.xml" />
  </Grid.DataContext>
  <TextBox x:Name="PickupSequenceTextBox" Text="{Binding XPath=/PalletConfig/PickupSequence}"/>
  <TextBox x:Name="DropoffSequenceTextBox" Text="{Binding XPath=/PalletConfig/DropoffSequence}"/>
  <ComboBox x:Name="SelectedPalletComboBox" ItemsSource="{Binding Mode=OneWay}" IsSynchronizedWithCurrentItem="True"
            SelectedValuePath="@display" DisplayMemberPath="@display"/>
  <TextBox x:Name="RowCount" Text="{Binding XPath=Rows}"/>
  <TextBox x:Name="ColumnCount" Text="{Binding XPath=Columns}"/>
  <TextBox x:Name="ColumnDimension" Text="{Binding XPath=YDimension}"/>
  <TextBox x:Name="RowDimension" Text="{Binding XPath=XDimension}"/>
</Grid>

The Pallet Configuration.xml file I'm databinding to looks like this:

<PalletConfig>
  <NumberOfPallets>2</NumberOfPallets>
  <CurrentPallet>3/8</CurrentPallet>
  <PickupSequence>B</PickupSequence>
  <DropoffSequence>A</DropoffSequence>
  <Pallets>
    <Pallet display="6.0mm">
      <Rows>10</Rows>
      <Columns>10</Columns>
      <XDimension>100.000</XDimension>
      <YDimension>100.000</YDimension>
      <PalletALocation>295, -5, -19, 0, -8, L</PalletALocation>
      <PalletBLocation>93, -6, -19, 0, 0, -8, L</PalletBLocation>
    </Pallet>
    <!--More pallet tags ...-->
  </Pallets>
</PalletConfig>

I set the datacontext for the grid to be at the individual pallet level. When I select a new pallet in the combo box, all of the textboxes below update with the values for the selected pallet.

What I can't figure out how to do is databind the <CurrentPallet> in the XML file to the selected item. I want it to save the selected item so the next time the application is ran, the combobox will select the pallet type that was last selected.

I've tried binding to the selecteditem, but haven't been successful. Nothing I have tried has updated the <CurrentPallet> tag when the changes were saved. Also, whatever I have tried made the combobox display a blank line the first one or two times you select a pallet type. It would display like it whould after that. I've also heard that the selecteditem doesn't do well with updating the combobox when whatever it is bound to changes, not that it matters I only want to do this at startup. Any solution that works will be appreciated.

Brad

Deja Moo - When you feel like you've heard the same bull before.

Ian Shlasko13-Aug-10 5:14

13-Aug-10 5:14

Here's how I would do it...

Grid: DataContext = /PalletConfig
- 2 TextBoxes bound to the two sequence numbers
- ComboBox: ItemSource bound as you have it now, SelectedIndex bound OneWayToSource to /PalletConfig/CurrentPallet

- Some container (Panel, groupbox, border, etc - Just to organize it) for other textboxes, DataContext bound to ComboBox.SelectedItem (ElementName binding)
-- Textboxes bound to rows, columns, dimensions

Unless the pallets will be shuffled around, storing the index seems like it should be enough, right?

Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)

BRShroyer13-Aug-10 5:18

13-Aug-10 5:18

I was hoping to bind to the name displayed (they are always unique) because the pallets can be shuffled around in the file. The users can move the <Pallet> tags so the pallets they use more often can be at the top of the list.

Brad

Deja Moo - When you feel like you've heard the same bull before.

Ian Shlasko13-Aug-10 5:25

13-Aug-10 5:25

Ah, that's a bit more tricky. The thing about binding is that one end of the bind MUST be a DependencyProperty on a DependencyObject. You really want to bind one field in your XML file to another, or alternately bind one property to two different values (Source1 = SelectedItem, Source2 = CurrentPallet).

I don't think you can do either, unfortunately. Your best bet might be to just hook the ComboBox's selection changed and update CurrentPallet in the code-behind. Then you can hook its DataContextChanged to initialize its SelectedItem to the CurrentPallet.

Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)

BRShroyer13-Aug-10 5:33

13-Aug-10 5:33

That's was kind of the route I had planned. It didn't make sense for the datacontext to open the file and me opening in the code-behind. Being that I'm new to databinding, I was hoping there was something easier I could do.

Thanks for your efforts.

Brad

Deja Moo - When you feel like you've heard the same bull before.

Ian Shlasko13-Aug-10 5:39

13-Aug-10 5:39

Data binding is great, but it does have certain limits. Binding directly to XML is pretty limited in itself, since it skips the ViewModel portion of the MVVM pattern entirely. Great for simple things, but falls short for anything that would normally require some back-end processing.

If this is going to get more complex, you might want to wrap a class around that XML... Well, two classes... One for the file itself, and one to represent a pallet.

Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)

BRShroyer13-Aug-10 5:47