WPF Discussion Boards

Pete O'Hanlon5-Jun-09 2:00

5-Jun-09 2:00

Change your thinking round so that you aren't considering the problem from how you get the data from the interface, as this is the wrong place to do it. Instead, think about using two-way binding to update your model, and save your changes from this.

What I would do is create a model that included a boolean field for the checkbox, and a string field for the textbox. When you bind your listview, set up these fields as binding targets using the standard Text="{Binding Path=..., Mode=TwoWay}" and IsChecked="{Binding Path=..., Mode=TwoWay}" syntax. You now have a simple mechanism for tackling this problem.

"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: How to FindControls in ListView

Glyn1235-Jun-09 4:03

Glyn123

5-Jun-09 4:03

Thanks for your reply Pete.

Could you please explain how to 'wire' this up properly, as I'm struggling!

In the XAML, I set the TextBox text binding to 'TestText'

<TextBox Name="TextBox1" Width="100" Text="{Binding Path=TestText, Mode=TwoWay}"></TextBox>

At the begining of the code behind, I declared and setup TestText:

Private _TestText As String

    Public Property TestText() As String
        Get
            Return _TestText
        End Get
        Set(ByVal value As String)
            _TestText = value
           
        End Set
    End Property

To test it, I used the following code to iterate through the ListView.

Private Sub BtnSubmitValues_Click(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles BtnSubmitValues.Click

        Dim row As System.Data.DataRowView
        For Each row In ListView1.Items

            MsgBox(TestText)
        Next
    End Sub

The test was meant to produce a seperate message box (for each ListView item), containing the value of each TextBox.
The Message boxes were all blank.

What am I doing wrong?

Thanks

Re: How to FindControls in ListView

Pete O'Hanlon5-Jun-09 4:14

Pete O'Hanlon

5-Jun-09 4:14

First of all, I'd implement INotifyPropertyChanged on your class if I were you. Raise the property changed notification in your setter.

"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: How to FindControls in ListView

Glyn1238-Jun-09 2:23

Glyn123

8-Jun-09 2:23

Hi,

I'm still struggling with this.

I posted the same question in another forum, where it was suggested that I use and ObservableCollection.
Which is the easiest method to implement?

Do you have any code snippets, or know of any similar examples?

Thanks

Re: How to FindControls in ListView

Pete O'Hanlon8-Jun-09 5:04

Pete O'Hanlon

8-Jun-09 5:04

An ObservableCollection will only tell you that a collection changed (i.e. that items were added or deleted from it). It won't tell you what changed, and it won't tell you if an individual item changed. That's why you implement INotifyPropertyChanged in your classes.

"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

Page turn in wpf 3d

AmirHossein.M.Ojvar4-Jun-09 20:50

AmirHossein.M.Ojvar

4-Jun-09 20:50

Hi there
i can't simulate a page turn in wpf and 3d environment..
(look like british library)

please help me to do it! Thumbs Up | :thumbsup:

Re: Page turn in wpf 3d

Pete O'Hanlon4-Jun-09 21:55

Pete O'Hanlon

4-Jun-09 21:55

You could always use this[^].

"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

Text and Image in header in listview

krishnan.s4-Jun-09 20:16

krishnan.s

4-Jun-09 20:16

Hi,

I need to display image and text together to the header in the Listview in wpf.Can u please let me know how to implement the same in wpf.

Thanks

Re: Text and Image in header in listview

Mark Salsbery4-Jun-09 21:14

Mark Salsbery

4-Jun-09 21:14

krishnan.s wrote:
the header in the Listview

ListView does't have a header.

Are you referring to GridView? If so, you can set the HeaderTemplate on a GridViewColumn.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Text and Image in header in listview

krishnan.s4-Jun-09 21:45

krishnan.s

4-Jun-09 21:45

Ya its the grid view iam referring too . Iam ale to display onlyone at a time , either text or image, Iam not getting how to display both together.Can u please let me know how to display both image and text in the single header cell.

Thanks

Re: Text and Image in header in listview

Mark Salsbery5-Jun-09 6:25

Mark Salsbery

5-Jun-09 6:25

krishnan.s wrote:
Iam ale to display onlyone at a time , either text or image, Iam not getting how to display both together

Use a panel that can host more than one element. Here's an example
using a StackPanel:

<ListView x:Name="booksListView" ItemsSource="{Binding Source={StaticResource BooksData}, XPath=*}" >
    <ListView.View>
        <GridView AllowsColumnReorder="False" >
            <GridViewColumn Width="100" DisplayMemberBinding="{Binding XPath=@ISBN}" >
                <code><GridViewColumn.HeaderTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Header Text" />
                            <Image Source="images/Silverlight_Logo.jpg" />
                        </StackPanel>
                    </DataTemplate>
                </GridViewColumn.HeaderTemplate></code>
            </GridViewColumn>
            <GridViewColumn Header="Title" Width="140" DisplayMemberBinding="{Binding XPath=Title}" />
            <GridViewColumn Header="Summary" Width="140" DisplayMemberBinding="{Binding XPath=Summary}" />
            <GridViewColumn Header="Price" Width="35" DisplayMemberBinding="{Binding XPath=price}" />
            <GridViewColumn Header="Stock" Width="35" DisplayMemberBinding="{Binding XPath=@Stock}" />
        </GridView>
    </ListView.View>
</ListView>

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Binding problem: Set a source of a 'Source' property.

Lutosław4-Jun-09 11:09

Lutosław

4-Jun-09 11:09

I want to acquire a value for a Source property of XmlDataProvider from application settings.

<settings:Settings x:Key="settings" />
<XmlDataProvider x:Key="srcMenu" Source="{Binding Source={StaticResource settings}, Path = Default.MenuPath, Mode=OneTime}"
                 XPath="KorepetytorMenu/RootNode"/>

Unfortunately, it comes out that Source is not a dependancy property and thus it cannot be bound.

Any suggestions?

Greetings - Jacek Gajek

Re: Binding problem: Set a source of a 'Source' property.

User 2710098-Jun-09 18:27

User 271009

8-Jun-09 18:27

Jacek,

You can assign it to an {x:Static local:AppSettings.MenuPath}. Then in your call using x:Static resolve the value from the settings file.

local above is a reference to your assembly.
AppSettings.MenuPath points to the below code.

Public Class AppSettings

Public Shared Property MenuPath as String
Get
Return (get the application setting and return it)
End Get

End Class

Cheers, Karl

» CodeProject 2008 MVP, CodeProject 2009 MVP

My Blog | Mole's Home Page |
XAML Power Toys Home Page

Just a grain of sand on the worlds beaches.

modified 27-Feb-21 21:01pm.

Re: Binding problem: Set a source of a 'Source' property.

Lutosław9-Jun-09 10:57

Lutosław

9-Jun-09 10:57

Thanks for your reply.

I don't get it. I have created that wrapper AppSettings class you mentioned but I cannot get the XAML working.

<XmlDataProvider x:Key="srcMenu" Source="{x:Static local:AppSettings.MenuPath}" XPath="KorepetytorMenu/RootNode"/>

That doesn't even compile.
Could you explain it more please? Sorry for my newbie-ness.

Thanks in advance.

Greetings - Jacek Gajek

Re: Binding problem: Set a source of a 'Source' property.

User 27100910-Jun-09 18:08

User 271009

10-Jun-09 18:08

Jacek,

Is the MenuPath property Shared (static in C#)

It must be for this syntax to work.

Cheers, Karl

» CodeProject 2008 MVP, CodeProject 2009 MVP

My Blog | Mole's Home Page |
XAML Power Toys Home Page

Just a grain of sand on the worlds beaches.

modified 27-Feb-21 21:01pm.

Re: Binding problem: Set a source of a 'Source' property.

Lutosław11-Jun-09 3:26

Lutosław

11-Jun-09 3:26

I know that. The problem was another: the Source property is of Uri type not String.

public static class AppSettings
{
	public static Uri MenuPath
	{
		get
		{
			return new Uri(Settings.Default.MenuPath, UriKind.Relative);
		}
	}
}

I wonder why it doesn't allow using directly Settings.Default.MenuPath (with a proper String -> Uri converter). The Default property is static as well.

Greetings - Jacek Gajek

Re: Binding problem: Set a source of a 'Source' property.

User 27100918-Jun-09 18:42

User 271009

18-Jun-09 18:42

I played with this some more and got the same results.

Suggest setting in code, reading the file location from the settings and setting the Source on load.

Cheers, Karl

» CodeProject 2008 MVP, CodeProject 2009 MVP

My Blog | Mole's Home Page |
XAML Power Toys Home Page

Just a grain of sand on the worlds beaches.

modified 27-Feb-21 21:01pm.

Re: Binding problem: Set a source of a 'Source' property.

Lutosław19-Jun-09 4:32

Lutosław

19-Jun-09 4:32

Karl Shifflett wrote:
setting in code

This is what I always can do. I'm learning WPF and more I want to achieve more and more tedious and exasperating it becomes.
Thanks for help though.

Greetings - Jacek Gajek

d3dimage + reference device

toxigun4-Jun-09 8:58

toxigun

4-Jun-09 8:58

Hey.
In our application we host d3d content in a WPF application and use d3dimage. However, sometimes we want to use a reference device that comes with the SDK to render the content in software. The problem is that the content is not displayed in the d3dimage (the content IS rendered.. getting the pixels from the render target and saving them to a file shows the content we want to render clearly).

Has anybody encountered this problem? Is there any known solution?

Alex.

Model and ViewModel on demand communication using MVVM pattern in WPF

Vinod Kumar Gupta4-Jun-09 2:44

Vinod Kumar Gupta

4-Jun-09 2:44

Hi,

I have been experiencing one typical problem in MVVM implementation in WPF based XBAP application. If anyone can through some light then it would be great help for me. As I am reaching to deadline of project and this (V to VM) communication seems to be biggest trouble for me. I have looked several articles and samples over the Internet but nothing seems to be helpfull for me.

My Requirement

I have a Main view (XAML page), this page contains one tab control having four tab items and each tab item has a grid control (we are using Xceed grid).
Let me explain this situation more precisely-
I have a view (Name EmployeeView), this view is nothing but a XAML page. In this view I have a tab control (Name EmploeeInfo). This tab control has four tab items (Name PersonalInfo, ProfessionalInfo, SocialInfo and FinancialInfo). Each tab item has one grid (Xceed grid- a .NOT compatible third party control) where I have to display the respective information.

I have created one user control (XAML page) for each tab and placed all user controls in EmployeeView, so this way I have total 5 views (one EmployeeView which is my main view and four for user controls), I also have 5 ViewModels (one for EmployeeView which is my MainViewModel and four for user controls)

I hope I have made myself clear in explaining the situation.

My Problem

I have to load the respective data only when the user clicks on the associated tab item i.e. I want to fetch personal information from model only when user clicks on PersonalInfo tab item, and want to fetch Social information from model when user clicks on SocialInfo tab item and so on...

I created ICommand in each ViewModel and bind that ICommand in respective view, now if I create instance of each ViewModel in MainViewModel then all tabls load data when the page loads, if I do not do not instantiate the all ViewModels in MainViewModel and instantiate them on-demand when they are clicked then my ViewModel gets data from Model but View does not get refershed to display the data, in this case all four tabs remain blank.

I have looked into many sampes but all samples load data initially but I want it on-demand....

If anyone can show me the way to solve this problem then it would be a great help for me.....

Thanks in advance.

Regards
Vinod

Re: Model and ViewModel on demand communication using MVVM pattern in WPF

ABitSmart4-Jun-09 4:44

ABitSmart

4-Jun-09 4:44

As per my understanding, your problem has nothing to do with MVVM. You have a databinding problem. If databinding object sources have data then there is no reason the View would not display them. Look at it from a simple perspective, if your object has data and it is not showing up in the UI then the first thing you should do is ensure databinding is happening properly. Check the Output window to see the databinding errors logged. Take a look at this article[^]

Re: Model and ViewModel on demand communication using MVVM pattern in WPF

Vinod Kumar Gupta8-Jun-09 18:59

Vinod Kumar Gupta

8-Jun-09 18:59

Hi,

Thanks a lot for your response. As per your response I have checked the binding information, everything looks fine from binding perspective.
The reason of my problem is that I always find the handler null, so my OnpropertyChanged() method doesn't get called henece the data is not refreshed in view.

Please let me know if I am missing anything?

Thank you very much

REgards
Vinod

request.responseJSON.d - what's ".d"?

devvvy3-Jun-09 21:20

devvvy

3-Jun-09 21:20

hello

request.responseJSON.d - what's ".d" in the end? I don't know what I've done but response JSON used to have this ".d" postfix, now it disappeared.

Thanks

dev

Re: request.responseJSON.d - what's ".d"?

Pete O'Hanlon4-Jun-09 0:47

Pete O'Hanlon

4-Jun-09 0:47

Have a read of this[^] article.

"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: request.responseJSON.d - what's ".d"?

devvvy4-Jun-09 0:49

devvvy

4-Jun-09 0:49

That's a good one, many thanks.

dev

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