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  • How do I implement movement in a WPF Adventure game?

    - by ZeroPhase
    I'm working on making a short WPF adventure game. The only major hurdle I have right now is how to animate objects on the screen correctly. I've experimented with DoubleAnimation and ThicknessAnimation both enable movement of the character, but the speed is a bit erratic. The objects I'm trying to move around are labels in a grid, I'm checking the mouse's position in terms of the canvas I have the grid in. Does anyone have any suggestions for coding the movement, while still allowing mouse clicks to pick up items when needed? It would be nice if I could continue using the Visual Studio GUI Editor. By the way, I'm fine with scrapping labels in a grid for a more ideal object to manipulate. Here's my movement code: ThicknessAnimation ta = new ThicknessAnimation(); The event handling movement: private void Hansel_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { ta.FillBehavior = FillBehavior.HoldEnd; ta.From = Hansel.Margin; double newX = Mouse.GetPosition(PlayArea).X; double newY = Mouse.GetPosition(PlayArea).Y; if (newX < Convert.ToDouble(Hansel.Margin.Left)) { //newX = -1 * newX; ta.To = new Thickness(0, newY, newX, 0); } else if (newY < Convert.ToDouble(Hansel.Margin.Top)) { newY = -1 * newY; } else { ta.To = new Thickness(newX, newY, 0, 0); } ta.Duration = new Duration(TimeSpan.FromSeconds(2)); Hansel.BeginAnimation(Grid.MarginProperty, ta); } ScreenShot with annotations: http://i1118.photobucket.com/albums/k608/sealclubberr/clickToMove_zps9d4a33cc.png ScreenShot with example movement: http://i1118.photobucket.com/albums/k608/sealclubberr/clickToMove_zps51f2359f.jpg

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  • WPF: TreeViewItem bound to an ICommand

    - by Richard
    Hi All, I am busy creating my first MVVM application in WPF. Basically the problem I am having is that I have a TreeView (System.Windows.Controls.TreeView) which I have placed on my WPF Window, I have decide that I will bind to a ReadOnlyCollection of CommandViewModel items, and these items consist of a DisplayString, Tag and a RelayCommand. Now in the XAML, I have my TreeView and I have successfully bound my ReadOnlyCollection to this. I can view this and everything looks fine in the UI. The issue now is that I need to bind the RelayCommand to the Command of the TreeViewItem, however from what I can see the TreeViewItem doesn't have a Command. Does this force me to do it in the IsSelected property or even in the Code behind TreeView_SelectedItemChanged method or is there a way to do this magically in WPF? This is the code I have: <TreeView BorderBrush="{x:Null}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <TreeView.Items> <TreeViewItem Header="New Commands" ItemsSource="{Binding Commands}" DisplayMemberPath="DisplayName" IsExpanded="True"> </TreeViewItem> </TreeView.Items> and ideally I would love to just go: <TreeView BorderBrush="{x:Null}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <TreeView.Items> <TreeViewItem Header="New Trade" ItemsSource="{Binding Commands}" DisplayMemberPath="DisplayName" IsExpanded="True" Command="{Binding Path=Command}"> </TreeViewItem> </TreeView.Items> Does someone have a solution that allows me to use the RelayCommand infrastructure I have. Thanks guys, much appreciated! Richard

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  • Recommendations on developing a WPF application without using MVVM or similar

    - by Metro Smurf
    We were building out the next version of an in-house thick-client application using WPF/Prism (Composite Application Library). As we were nearly done with the client our team was put under new management and shortly thereafter: We were then directed to drop the Prism framework to keep things simple. This includes not using any type of Inversion of Control. We were directed to build out the WPF application without using MVVM or similar; and more along the lines of a traditional WinForm application. The idea is that if a developer sees a control in Visual Studio’s designer view, then (s)he should be able to click on the control and see exactly what it's doing without having to traverse through a view-model (or similar). We have now been tasked with building out the WPF application using one primary Window, use a Frame Control to contain the content, and use a Ribbon outside of the frame for the menu items. Reason we were provided to use Frame Control: a. We will show a view in the Frame with a Page (not a user control) and then load the page in the Frame. b. When a new view is to be shown in the Frame, the current view (Page) will be closed/disposed and the new view (Page) will take its place in the Frame. c. When a developer looks at the Page in design view, (s)he will be able to click on any control and see exactly what is being done. Given the restrictions of 1 and 2 above, we’d like to present another method of building out the application that: Can be presented as an alternative to using the “Frame Methodology” (item 3 above) but still provides the same type of functionality. Does not use MVVM (see #1 and #2 above). Provided the direction we’ve been given, any suggestions as to an alternative we can present? I’d request that the responses be kept on the professional level and thank you in advance.

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  • How to keep relative position of WPF elements on background image

    - by Masterfu
    Hi folks, I am new to WPF, so the answer to the following question might be obvious, however it isn't to me. I need to display an image where users can set markers on (As an example: You might want to mark a person's face on a photograph with a rectangle), however the markers need to keep their relative position when scaling the image. Currently I am doing this by using a Canvas and setting an ImageBrush as Background. This displays the image and I can add elements like a Label (as replacement for a rectangle) on top of the image. But when I set a label like this, it's position is absolute and so when the underlying picture is scaled (because the user drags the window larger) the Label stays at it's absolute position (say, 100,100) instead of moving to the new position that keeps it "in sync" with the underlying image. To cut the matter short: When I set a marker on a person's eye, it shouldn't be on the person's ear after scaling the window. Any suggestions on how to do that in WPF? Maybe Canvas is the wrong approach in the first place? I could keep a collection of markers in code and recalculate their position every time the window gets resized, but I hope there is a way to let WPF do that work for me :-) I am interested in hearing your opinions on this. Thanks

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  • WPF Background Thread Invocation

    - by jeffn825
    Maybe I'm mis-remembering how Winforms works or I'm overcomplicating the hell out of this, but here's my problem. I have a WPF client app application that talks to a server over WCF. The current user may "log out" of the WPF client, which closes all open screens, leaves only the navigation pane, and minimizes the program window. When the user re-maximizes the program window, they are prompted to log in. Simple. But sometimes things happen on background threads - like every 5 minutes the client tries to make a WCF calls that refreshes some cached data. And what if the user is logged out when this 5 minute timer triggers? Well, then the user should be prompted to log back in...and this must of course happen on the UI thread. private static ISecurityContext securityContext; public static ISecurityContext SecurityContext { get { if (securityContext == null) { // Login method shows a window and prompts the user to log in Application.Current.Dispatcher.Invoke((Action)Login); } return securityContext; } } So far so good, right? But what happens when multiple threads hit this spot of code? Well, my first intuition was that since I'm syncrhonizing across the Application.Current.Dispatcher, I should be fine, and whichever thread hit first would be responsible for showing the login form and getting the user logged in... Not the case... Thread 1 will hit the code and call ShowDialog on the login form Thread 2 will also hit the code and will call Login as soon as Thread 1 has called ShowDialog, since calling ShowDialog unblocked Thread 1 (I believe because of the way the WPF message pump works) All I want is a synchronized way of getting the user logged back into the application...what am I missing here? Thanks in advance.

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  • Why isn't my WPF Datagrid showing data?

    - by Edward Tanguay
    This walkthrough says you can create a WPF datagrid in one line but doesn't give a full example. So I created an example using a generic list and connected it to the WPF datagrid, but it doesn't show any data. What do I need to change on the code below to get it to show data in the datagrid? ANSWER: This code works now: XAML: <Window x:Class="TestDatagrid345.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit" xmlns:local="clr-namespace:TestDatagrid345" Title="Window1" Height="300" Width="300" Loaded="Window_Loaded"> <StackPanel> <toolkit:DataGrid ItemsSource="{Binding}"/> </StackPanel> </Window> Code Behind: using System.Collections.Generic; using System.Windows; namespace TestDatagrid345 { public partial class Window1 : Window { private List<Customer> _customers = new List<Customer>(); public List<Customer> Customers { get { return _customers; }} public Window1() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { DataContext = Customers; Customers.Add(new Customer { FirstName = "Tom", LastName = "Jones" }); Customers.Add(new Customer { FirstName = "Joe", LastName = "Thompson" }); Customers.Add(new Customer { FirstName = "Jill", LastName = "Smith" }); } } }

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  • Handling events from user control containing a WPF textbox

    - by Tom
    I've been successful in putting a WPF textbox into an existing windows form using ElementHost and a user control. It looks like the following: Public Class MyUserControl Private _elementHost as ElementHost = New ElementHost Private _wpfTextbox as System.Windows.Controls.Textbox = New System.Windows.Controls.Textbox Public Sub New() Me.Controls.Add(_elementHost) _elementHost.Dock = DockStyle.Fill _elementHost.Child = _wpfTextbox _wpfTextbox.SpellCheck.IsEnabled = True End Sub End Class Now, when I put this user control onto a windows form, it accepts keyboard input and the form itself can get text from the textbox. However, when I try to handle keypress (or keydown, keyup) events from the user control, nothing happens. I've looked into this problem and did a bit of research but now I'm a little confused as to what I really need to be looking at. The following are the topics that I am somewhat confused about. HwndSource Relaxed delegates WPF routed events If I am interpreting everything correctly, input from WPF textboxes are handled differently compared to regular form textboxes. It seems like both aren't compatible with each other but there must be some way to "pass" keys from one to another? I'd appreciate any help.

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  • Switching to WPF, the best use of time at Visual Studio Launch 2010

    - by Stewbob
    Yes, this is a programming-related question, if a little indirectly (that's why I marked it Community Wiki right away). For better or worse, I am switching from Winforms to WPF in April. I am also going to be in attendance at the Visual Studio Launch in Las Vegas. I have a real need to get up to speed quickly in WPF, so my question is: What sessions are going to be the best use of my time? I've got some picked out already, but I'm looking for some more advice on how to wade through all the marketing fluff and get some real educational value out of these few days. I have not been to one of these events before, so I don't really know how much is marketing hype, and how much is solid content. A couple of the workshops look interesting (VPR02 and VPS02), but I don't know enough about the actual content of these to justify the extra expense right now. Any thoughts there would be appreciated. And yes, I do have WPF learning planned other than just these few days in Vegas, but since I'm going to be there anyway, I want to learn as much as I can in the time available.

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  • C# / Silverlight / WPF / Fast rendering lots of circles

    - by Walt W
    I want to render a lot of circles or small graphics within either silverlight or wpf (around 1000-10000) as fast and as frequently as possible. If I have to go to DX or OGL, that's fine, but I'm wondering about doing this within either of those two frameworks first (read: it's OK if an answer is WPF-only or Silverlight-only). Also, if there is a way to access DX through WPF and render on a surface that way, I would be interested in that as well. So, what's the fastest way to draw a load of circles? They can be as plain as necessary, but they do need to have a radius. Currently I'm using DrawingVisual and a DrawingContext.DrawEllipse() command for each circle, then rendering the visual to a RenderTargetBItmap, but it becomes very slow as the number of circles rises. By the way, these circles move every frame, so caching isn't really an option unless you're going to suggest caching the individual circles . . . But their sizes are dynamic, so I'm not sure that's a great approach.

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  • Assembly-wide / root-level styles in WPF class library

    - by WarpedBoard
    I have a C# (2008/.NET 3.5) class library assembly that supports WPF (based on http://dotupdate.wordpress.com/2007/12/05/how-to-add-a-wpf-control-library-template-to-visual-c-express-2008/). I've created several windows, and am now attempting to create a common style set for them. However, as it's a class library (instead of a WPF app), I don't have an app.xaml (and its contained Application & corresponding Application.Resources) in which to store these styles for global access. So: How can I create a top-level set of style definitions that'll be seen by all xaml files in the assembly, given that I do not have app.xaml (see above)? And/or is it possible to add a working app.xaml to a class library? FYI, I did try creating a ResourceDictionary in a ResourceDictionary.xaml file, and include it in each window within a "Window.Resources" block. That turned out to solve the styling of Buttons, etc... but not for the enclosing Window. I can put 'Style="{StaticResource MyWindowStyle}"' in the Window's opening block, and it compiles and shows up in the VS Design window fine, but during actual runtime I get a parse exception (MyWindowStyle could not be found; I'm guessing Visual Studio sees the dictionary included after the line in question, but the CRL does things more sequentially and therefore hasn't loaded the ResourceDictionary yet).

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  • Bind an Incode DataTemplate in WPF

    - by Mike Bynum
    I have a WPF Application which is using MVVM. I know that there ways of doing this in XAML but I am working on a plugin architecture and came up with a solution where a plugin exposes it's viewmodel to my plugin host's viewmodel and it's datatemplate. I want to leave the lifetime management of the plugin view up to WPF. I have tried having the plugins expose a UserControl but ran into issues when WPF decided to dispose of my UserControl so I would not reattach it without weird hacky work arounds. I am having issues getting some sort of binding working to where i can bind a control to the data and it's template to my data template. I have a ViewModel which looks something like: public class MyViewModel { public DataTemplate SelectedTemplate{ get; set;} public object SelectedViewModel {get; set;} } The selected template and viewmodel are determined somewhere else in the code but are irrelevant to my question. My question is how i can bind to a DataTemplate so that I know how to display the data shown in the SelectedViewModel. The DataTemplate is a DataTemplate created incode which respresents: <DataTemplate DataType="{x:Type vm:MyViewModel}"> <v:MyUserControl /> </DataTemplate> I have tried: <UserControl Template="{Binding Path=SelectedTemplate}" Content="{Binding Path=SelectedViewModel"} /> But UserControl expects a control template and not a data template.

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  • iptables forwarding to a dummy interface

    - by madinc
    Hi, I'm trying to accomplish the following: I have a box with a service listening on a dummy interface (say 172.16.0.1), udp port 5555. Now what I'd like to do is to take packets that arrive on interfaces eth0 (1.1.1.1:5555) and eth1 (2.2.2.2:5555) and forward them to the service on the dummy interface, and have replies go back to clients out the same physical interface they came in. Clients must think they're talking to 1.1.1.1:5555 or 2.2.2.2:5555. I think I need a mix of iptables rules and packet marking, plus some iproute rules (if it's possible at all). What I tried is to catch packets coming in from eth0 and eth1, udp port 5555, and mark them with 1 and 2 respectively, and --save-mark in the connmark. Then I used a DNAT to 172.16.0.1. The service seems to be getting the packets. Now I'm not sure how to do the reverse. It seems that for packets originating from the box, you can't do anything before the routing decision, but that would be the place to restore the marks, and thus make a routing decision based on those. Here's what I have so far: iptables -t mangle -A PREROUTING -d 1.1.1.1 -p udp --port 5555 -j MARK --set-mark 1 iptables -t mangle -A PREROUTING -d 2.2.2.2 -p udp --port 5555 -j MARK --set-mark 2 iptables -t mangle -A PREROUTING -d 1.1.1.1 -p udp --port 5555 -j CONNMARK --save-mark iptables -t mangle -A PREROUTING -d 2.2.2.2 -p udp --port 5555 -j CONNMARK --save-mark iptables -t nat -A PREROUTING -m mark --mark 1 -j DNAT --to-destination 172.16.0.1 iptables -t nat -A PREROUTING -m mark --mark 2 -j DNAT --to-destination 172.16.0.1 # What next? As I said, I'm not even sure it can be done. To give a bit of background, it's an old OpenVPN installation that cannot be upgraded (otherwise I'd install a recent version that supports multihoming natively). Thanks for any help.

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  • StackPanel location changes at runtime

    - by Vinjamuri
    I have a ToolBar WPF control which has a Stackpanel docked to right. I use this toolbar control in 3 other WPF controls by adding in the XAML. When I verify in the XAML the Stackpanel location is same for all 3 controls. But when I run my application, for one of the 3 controls, the StackPanel in the ToolBar control shifts to left. <StackPanel DockPanel.Dock="Right" Orientation="Horizontal" HorizontalAlignment="Right" Name="stackButtons" > Any idea? Appreciate your help..

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  • How to add global exception handling to a add-in dll?

    - by redjackwong
    Here's my context: I am writing a WPF add-in for an application. This Application's main thread is unmanaged. I want to add a global exception handling system for this add-in to handle any unhandled exceptions. Here's what I've tried but not working: I cannot add a try-catch block to my Application.Run() code line. Because I am an add-in, that code fragment is in the application. System.Windows.Forms.Application.ThreadException is not working too. There might not be an WinForm Application exists. (WPF hosting in unmanaged code.) AppDomain.CurrentDomain.UnhandledException is not working too. Because maybe it's handled by the Application itself. It just doesn't enter my code. So, any ideas for this situation?

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  • Issue with mouse move event

    - by Vinjamuri
    I have a WPF control1 (has a moving control) that is hosted through elementhost on a windows form. My aim is to capture the mouse move events for the elementhost. I found out from the following link that MouseMove fires when Control moves under mouse while mouse stands still. http://social.msdn.microsoft.com/Forums/en/wpf/thread/56e7b331-ac6f-4d62-a83b-c09009b79fa0 I am getting fake mouse move events for elementhost. In order to fix this issue, I added a button on top of elementhost and set its Visible property to Hidden. Still I get fake mouse move events.. How to fix this issue? Is there any workaround? Appreciate your help...

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  • WPF - List items not visible in Blend when 'DisplayMemberPath' is used

    - by Andy T
    Hi, We're currently working out how to implement MVVM and I've got to the point where I've got the MVVM Light Toolkit set up in blend and can specify dummy data to be supplied if running in Blend. All good. I've created a dummy list of data. The list contains 6 instances of a very simple class called DummyItem which has Age and Name properties. Here's the main code from my 'DummyList' class: public class DummyItem{ public string Name; public int Age; public DummyItem(string name, int age){ this.Name = name; this.Age = age; } } public class DummyList : ArrayList { public DummyList() { this.Add(new DummyItem("Dummy1", 00)); this.Add(new DummyItem("Dummy2", 01)); this.Add(new DummyItem("Dummy3", 02)); this.Add(new DummyItem("Dummy4", 03)); this.Add(new DummyItem("Dummy5", 04)); this.Add(new DummyItem("Dummy6", 05)); } } Here's the operative part of my XAML. The DataContext line does work and points to the correct ViewModel. <Grid x:Name="LayoutRoot"> <ListBox x:Name="ListViewBox" DataContext="{Binding Source={StaticResource Locator}, Path=ListViewModel}" ItemsSource="{Binding TheList}" DisplayMemberPath="Name"> </ListBox> </Grid> The problem is, when I add 'DisplayMemberPath', as I have above, then I can no longer see the list items in Blend. If I remove 'DisplayMemberPath', then I see a list of objects (DummyItem) with their full path. When the app is run, everything works perfectly. It's just that in Blend itself I cannot see the list items when I use 'DisplayMemberPath'. Anyone know why I can't see the items inside Blend itself when I use DisplayMemberPath? Thanks! AT

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  • Using XAML + designer to edit Plain Old CLR Objects?

    - by Joe White
    I want to write a POCO in XAML, and use a DataTemplate to display that object in the GUI at runtime. So far, so good; I know how to do all that. Since I'll already have a DataTemplate that can transform my POCO into a WPF visual tree, is there any way to get the Visual Studio designer to play along, and have the Design View show me the POCO+DataTemplate's resulting GUI, as I edit the POCO's XAML? (Obviously the designer wouldn't know how to edit the "design view"; I wouldn't expect the Toolbox or click-and-drag to work on the design surface. That's fine -- I just want to see a preview as I edit.) If you're curious, the POCOs in question would be level maps for a game. (At this point, I'm not planning to ship an end-user map editor, so I'll be doing all the editing myself in Visual Studio.) So the XAML isn't WPF GUI objects like Window and UserControl, but it's still not something where I would want to blindly bang out some XAML and hope for the best. I want to see what I'm doing (the GUI map) as I'm doing it. If I try to make a XAML file whose root is my map object, the designer shows "Intentionally Left Blank - The document root element is not supported by the visual designer." It does this even if I've defined a DataTemplate in App.xaml's <Application.Resources>. But I know the designer can show my POCO, when it's inside a WPF object. One possible way of accomplishing what I want would be to have a ScratchUserControl that just contains a ContentPresenter, and write my POCO XAML inside that ContentPresenter's Content property, e.g.: <UserControl ...> <ContentPresenter> <ContentPresenter.Content> <Maps:Map .../> </ContentPresenter.Content> </ContentPresenter> </UserControl> But then I would have to be sure to copy the content back out into its own file when I was done editing, which seems tedious and error-prone, and I don't like tedious and error-prone. And since I can preview my XAML this way, isn't there some way to do it without the UserControl?

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  • 5 Reasons why I hate WPF

    - by Richard Mitchell
    I decided to use writing a new tool as a way to learn WPF and MVVM and I thought I'd write down a few of my problems as a way of cathartic release. I decided to read a book before attempting WPF for the first time as I've heard others complain about the steep learning curve. I chose the rather excellent "WPF 4 Unleashed" by Adam Nathan to read through and "Pro WPF in C# 2010" by Matthew MacDonald as a reference whilst I programmed. 1 - Poor editing support for XAML The first thing I think any...(read more)

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  • Silverlight? WPF? or Windows Form?

    - by Amit
    After Silverlight 4.0 has been released with new WPF, I am kind of confused with these technologies: Silverlight? WPF? Windows Form? The main motive that we want to achieve for BIG business project is following: Performance Security And platform independent** If I consider all above three points then only Silverlight is the option as I don’t want people buying emulator on MacOS for WPF or Windows Form. Now how good the Silverlight is for Business applications, I was completely against when Silverlight 2.0 was in the market but now it is Silverlight 4.0 and they have provided many new features (but still basics) that is required in any challenging business applications. Comparing Silverlight and WPF -* Silverlight and WPF are very new technology and if I'd to compare from these two then I'd prefer WPF because it can be considered stable and mature. But it is not same as Windows Form. -* If I go with Silverlight then I am sure about keep updating to the latest version of Silverlight. I remembered when we were developing software for version 2.0 then we'd to create our own framework with dynamic loading DLL, and then Navigation concept. But everything was got changed once Silverlight 3.0 came. I don't want this to be happening with this new product. -* If we go with WPF then we don't get the platform independence. Now, why not we just focus on making WPF and then move to Silverlght. As someone (Tim?) from Microsoft has said that the idea is to make Silverlight as close as WPF. But if that is the case then why XAML structure is different; I will not be convinced with by saying that .Net framework for SL is too small.. well the difference is coming from the namespace ? I was searching on this subject and found "Microsoft WPF-Silverlight Comparison Whitepaper v1.1.pdf". This guide is very good that gives you ins-outs about how can we build common apps that runs on both. But again, it is comparing Silverlight 2 and not 4. I am sure many architect/ developers/ project managers must be facing similar kind of questions in their premises and wants to initiate this discussion, if it has not been :). We've still got 2 weeks to make this decision, so I'm expecting everyone to participate, gurus?

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  • How to use a FolderBrowserDialog from a WPF application with MVVM

    - by David Work
    I'm trying to use the FolderBrowserDialog from my WPF application - nothing fancy. I don't much care that it has the Windows Forms look to it. I found a question with a suitable answer (How to use a FolderBrowserDialog from a WPF application), except I'm using MVVM. This was the answer I "implemented", except I can't get the window object and I'm just calling ShowDialog() without any parameters. The problem is this: var dlg = new FolderBrowserDialog(); System.Windows.Forms.DialogResult result = dlg.ShowDialog(this.GetIWin32Window()); In my ViewModel there the this has no GetIWin32Window() method for me to get the Window context. Any ideas on how to make this work?

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  • WPF DataBinding, CollectionViewSource, INotifyPropertyChanged

    - by plotnick
    First time when I tried to do something in WPF, I was puzzled with WPF DataBinding. Then I studied thorougly next example on MSDN: http://msdn.microsoft.com/en-us/library/ms771319(v=VS.90).aspx Now, I quite understand how to use Master-Detail paradigm for a form which takes data from one source (one table) - both for master and detailed parts. I mean for example I have a grid with data and below the grid I have a few fields with detailed data of current row. But how to do it, if detailed data comes from different but related tables? for example: you have a Table 'Users' with columns - 'id' and 'Name'. You also have another table 'Pictures' with columns like 'id','Filename','UserId'. And now, using master-detail paradigm you have to built a form. And every time when you chose a row in a Master you should get all associated pictures in Details. What is the right way to do it? Could you please show me an example?

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  • WPF DataGrid AutoColumn generation via ICustomTypeDescriptor.

    - by panamack
    In a test project I've managed to AutoGenerate WPF DataGrid columns in the following scenario, where the data is stored in a Dictionary and binding is performed via PropertyDescriptors: public class People:List<Person>{ ... } public class Person:Dictionary<string,string>,INotifyPropertyChanged,ICustomTypeDescriptor { } The problem I'm having is in my real life project I'm using MVVM so it's *People*ViewModel which inherits ViewModelBase and hence can't inherit List<Person>. I've tried implementing IList<Person> instead with an internal List<Person> and explicitly setting the DataContext to an IList<Person> reference but that didn't work. I've seen a similar post on binding a win forms DataGridView here, so I'm wondering if the same sort of logic applies in WPF and primarily, what exactly causes the ICustomTypeDescriptor implementation to be picked up when inheriting List<T> that is missing when you simply implement IList<T> instead.

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