WPF Discussion Boards

No, I do not have the answer. The problem is not 'Must compile XAML that specifies events'.

The problem is that Visual Studio does not accept XAML files that have Elements whose Background property is set. On my machine it is not compatible with the Background property for some reason. After I set any Background property on my XAML page and I run my project, Visual Studio will show a white page in my Accuracy.html. Everything is white. No content. I am trying to understand why Visual Studio does not accept this Background property.

Strange?? I do files with a great deal of backgrounds with fancy gradients, images... designed with blend of course??
Well mine is vs2012? yours??

Hi,
Is this okay to use Frame control in my Main window to load a Xaml page at Runtime?
It also has to support drag/drop feature so that users can drag a control from Toolbox of Main window to the Xaml page in the Frame.

Please suggest/explain.

Thanks.

Be a good professional who shares programming secrets with others.

You can directly load the view into the user control.

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Whether user control supports drag/drop?

Be a good professional who shares programming secrets with others.

Hi, I have a treeview where the nodes are generated on runtime.

I want to drag the child node into a canvas a generate an image for each node.

My scenario is i want to allow only certain node to be able to drag and only allow dragging when user want to edit the canvas. How should i achieve that?

Currently I'm using the Silverlight Toolkit TreeViewDragDropTarget.

I have been working on a project that uses user controls inside other views. What I still can't figure out is how to get a reference to the user control's ViewModel so I can get data off of it or write data to it.

So far, I have been getting a reference to the user control, then getting the VM as the DataContext, then accessing it through that refereence. But this doesn't seem to be right.

In another project I'm using a factory pattern in my AppResources.XAML, such as:

<DataTemplate DataType="{x:Type vm:ClientCenterViewModel}">
    <vw:ClientCenterView/>
</DataTemplate>

This does a nice job of pairing the VM to the View, but I can't get a reference to the view's VM to read/write to it.

What's the right way to do this?

Thanks

If it's not broken, fix it until it is

You shouldn't need to have access to a child controls VM directly. It's all done via data binding.

<Window>
<Grid>
<MyChildView SomeProp="{Binding SomeProp}" />
</Grid>
</Window>

If you are using DataTemplates to map views <-> VMs, you also don't need access to the VM directly because those views should operate on thier own VMs which would talk to the persistance layer directly.

If you are finding that you need to access a child control/view to do stuff from the code behind, its probably because you didn't expose that functionality with a bindable property. If you don't own the code of the child view, you can expose the functionality you need with a bindable attached behavior.

Ok, I'm not sure I understand.

In this case I have a Materials view, and on it is a control that lists prices. The prices control is used in more than one view which is why it's a control.

There is a one to many between Materials and Prices, so the prices view needs to know the PK of the Material. In addition, the Material needs to know the count of Prices and other info.

When a material is selected I need to tell the prices view the PK of the selected material so it can load them. When a price is added to the list in the Prices control, the Material view needs to know it.

The Prices control already handles it's own CRUD operations, but I don't understand how it and the Materials view are supposed to intertact. There has to be some way to say "Hey Prices view, give me your data" or, "Hey Prices view, load the prices for this Material".

Using Data Templates to map them seems to make it impossible since the VM for the Materials has no clue that there's a Prices control any where.

If it's not broken, fix it until it is

Yeah, so its like what I said. Assuming I get what you are talking about Smile | :)

. Psuedo-code:

<Window>
<MaterialView />
</Window>

<MaterialView>
<ListView Name="lv" ItemsSource="{Binding ListOfMaterials}" />
<PriceControl Source="{Binding ElementName=lv, Path=SelectedItem.PK}" />
</MaterialView>

Then your PriceControl would auto-magically know when a different material has been selected. But it needs to expose a property that can be data-bound.

EDIT: I just noticed in your response that you wanted to go both ways, so you can do something like:

<MaterialView>
<Label Content="{Binding ElementName=pc, Path=Count" />
</MaterialView>

You just need to expose everything you want to transfer back and forth as a property in the VMs.

The key here is to use the ElementName binding.

I see. Thanks!

If it's not broken, fix it until it is

OK, I'd like to ask a follow up question...

Using your code as an example, in the case of the PriceControl, I would have to create a Dependency Property on the control called 'Source', correct?

If so, then that code goes in the control's code behind. How do I 'connect' that Source property to the PricingControl's view model? What I mean is - the view model doesn't know about the Source property, does it?

If it's not broken, fix it until it is

PriceControl.cs would have something like:

public class PriceControl : Control
{
public static readonly DependencyProperty SourceProperty = DependencyProperty.Register("Source",
typeof(Whatever), typeof(PriceControl), ...);
}

then in your xaml:

<some random tag>
<some other random tag>
<ListView Name="lv" ItemsSource="{Binding Items}" ... />
<PriceControl Name="priceControl" Source={Binding ElementName="lv", Path="SelectedItem"} ... />
</some other random tag>
</some random tag>

Or something of that nature.

You shouldn't really need to refer to Source in the controls VM... you should do it in the XAML... if you use a DataTemplate to define the control's look, you'll be able to refer to the Source property in there.. {Binding Path=Source}...

if you REALLY need to access it in your VM, I think you mentioned SQL calls or something like that, you could define a property in your VM and bind it to Source in the style.

It's been a month since we last discussed this. I had to put it aside...

So, this morning I create a Sample User Control[^] app to try to do what you suggested here. For the most part I think it's close.

When a Customer is selected, the control should go get the addresses for it. However, the DP's Getter never fires.

This brings me to a question...

Now that I have the DP in the AddressView code behind, when the CustomerId DP is set, how does the VM know about it? What is the connection between the DP in the Code Behind and the VM?

At any rate, I provided a link to the sample. It's pretty small, and I think I coded what you showed me. I would appreciate you taking a quick look to see if you can spot where I'm wrong.

And thanks for all your help so far.

If it's not broken, fix it until it is

Hello Listeners,
Working on a silverlight application. The data that needs to be returned is very small (1-4 rows)
My domainservice includes following code to populate a datagrid

public IQueryable<products> GetProductsFiltered(int vendorId)

{
return this.ObjectContext.Products.Where(P => P.VendId == vendorId);

}

When the correct value is provided via a “GetProductsFilteredQuery(2)”, the server returns the data and datagird is properly populated.

Now I need to return data based on a column named SiteID so I added another method
public IQueryable<products> GetProductsFilteredSite(int siteId)

{
return this.ObjectContext.Products.Where(P => P.SiteID == siteId);

}
And call it by something like this “GetProductsFilterSiteQuery(5)” . Compiles fine but but error is generated when running the application:
“Local operation failed for query “ GetProductsFilterSite”. The remote server returned an error: NotFound”.

Run the query manually –OK
Fiddler also logs an 504 error “ReadResponse() failed: The server did not return a response for this request.”
But also shows a valid argument passed to GetProductsFilterSiteQuery() method
Any idea is greatly appreciated

You can try out two things -

1) If you are deploying your service on IIS, you will need to redeploy after adding the new method.
2) You will need to update your service proxy. If you added the website manually, then just right click on the service and refresh.

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Re-publishing the domain services solved my problem.
Many thanks for the help Abhinav

How to achieve the below layout ? I am new to Silverlight. I need to achieve the same with Paging. Which one is better DataGrid or ListBox ? Can i achieve the same with normal Silverlight but with paging? I dn't want a column header and also my row should have the details filled with Image,Links,Text etc as below...

I want to achieve the same Layout as given in the link http://demos.devexpress.com/AgDataGridDemos/ under the Customization/Row Template tab with Filtering,Sorting and paging functionalities using normal Silverlight Controls. I have to hide the Headers also.

Note: In the example,u can see only Rowtemplate.I wanna acheive exactly same Layout.Go to Link and Click Customization/Row Template tab

Since you use a number of features like filtering and sorting, you could go for a grid rather than a listbox.
If you want to go for light code and avoid a heavy grid loading on your page, you could still consider using the listbox and build sorting and filtering features into it.

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XML

I have a SL application that I have been working. Make little changes and save a back up so I can roll it back if a problem so I have a few backups.
Today I open the project and the page generated an error.  Although I can compiled successfully, the error is when I view page in designer. " ArgumentException was thown on parameter": The myMethod method does not have an argument that matches the querParameter collection".
Then I tried to load a previous project and shows the same thing, as of matter of fact, all of them have the same problem now.  What a…!!!
Problem points to
                <riaControls:Parameter ParameterName="argType" Value="{Binding ElementName=argTypeTextBox, Path=Text}" />

The code is below.  Any help is greatly appreciated



<navigation:Page x:Class="EclipseMTX.Views.Protons"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="1200" d:DesignHeight="724"
           Title="Protons Page" BorderBrush="#FF834F4F" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.DomainServices" xmlns:my="clr-namespace:EclipseMTX.Web">
        <Grid x:Name="LayoutRoot" Background="#FF0E0E0E" Width="1196" Height="728">
        <sdk:DataGrid AutoGenerateColumns="True" AutoGeneratingColumn="DGPro_AutoGeneratingColumn" Height="263" HorizontalAlignment="Left" Margin="135,86,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="1049" Background="#F3333333" Foreground="WhiteSmoke" RowBackground="#F3333335" VerticalScrollBarVisibility="Disabled" />
        <sdk:Label Height="45" HorizontalAlignment="Left" Margin="439,28,0,0" Name="label1" VerticalAlignment="Top" Width="324" Content="Proton Installed base" Foreground="WhiteSmoke" FontSize="28" />
        <sdk:DataPager Height="26" HorizontalAlignment="Left" Margin="135,347,0,0" Name="dataPager1" PageSize="10" VerticalAlignment="Top" Width="1051" Background="#F3333333" Cursor="Hand" Foreground="WhiteSmoke" />
        <Button Content="Run Query" Height="23" HorizontalAlignment="Left" Margin="19,355,0,0" Name="button1" VerticalAlignment="Top" Width="102" Click="button1_Click" />

       <riaControls:DomainDataSource AutoLoad="False" d:DesignData="{d:DesignInstance my:Proton, CreateList=true}" Height="0" LoadedData="protonDomainDataSource_LoadedData" Name="protonDomainDataSource" QueryName="GetProtonsFiltered" Width="0">
            <riaControls:DomainDataSource.DomainContext>
               <my:EclipseMTXDomainContext />
            </riaControls:DomainDataSource.DomainContext>
            <riaControls:DomainDataSource.QueryParameters>
                <riaControls:Parameter ParameterName="argType" Value="{Binding ElementName=argTypeTextBox, Path=Text}" />
                            </riaControls:DomainDataSource.QueryParameters>
        </riaControls:DomainDataSource>
        <StackPanel Height="30" HorizontalAlignment="Left" Orientation="Horizontal" VerticalAlignment="Top"></StackPanel>
        <sdk:Label Height="28" HorizontalAlignment="Left" Margin="19,58,0,0" Name="label3" VerticalAlignment="Top" Width="120" Content="By Vendor" Foreground="WhiteSmoke" FontSize="18" />
        <sdk:DataGrid AutoGenerateColumns="True" AutoGeneratingColumn="DGPCSN_AutoGeneratingColumn" Height="265" HorizontalAlignment="Left" Margin="135,421,0,0" Name="dataGrid2" VerticalAlignment="Top" Width="1049" Background="#F3333333" RowBackground="#F3333335" Foreground="WhiteSmoke" />
        <Button Content="Run Query" Height="23" HorizontalAlignment="Right" Margin="0,509,1084,0" Name="button2" VerticalAlignment="Top" Width="93" Click="button2_Click" />
        <ComboBox Height="23" HorizontalAlignment="Right" Margin="0,453,1068,0" Name="comboBox2" VerticalAlignment="Top" Width="120" SelectionChanged="comboBox2_SelectionChanged" />
        <sdk:DataPager Height="26" HorizontalAlignment="Left" Margin="135,687,0,0" Name="dataPager2" PageSize="10" VerticalAlignment="Top" Width="1047" Background="#F3333333" Foreground="WhiteSmoke" />
        <RadioButton Content="By PcSn" Height="33" HorizontalAlignment="Right" Margin="0,389,1075,0" Name="radioButton1" VerticalAlignment="Top" Foreground="WhiteSmoke" FontSize="18" Width="109" />
        <RadioButton Content="By T-Box" Height="33" HorizontalAlignment="Left" Margin="8,421,0,0" Name="radioButton2" VerticalAlignment="Top" Foreground="WhiteSmoke" FontSize="18" Width="131" />
        <TextBox Background="#FF0E0E0E" Height="34"  HorizontalAlignment="Left" Margin="668,387,0,0" Name="textBox1" VerticalAlignment="Top" Foreground="WhiteSmoke" FontSize="12" Width="428" BorderBrush="Black" />
        <ListBox HorizontalAlignment="Left" Margin="12,86,0,0" Name="listBox1" Width="120"  Background="#F3333333" Foreground="WhiteSmoke" Height="263" VerticalAlignment="Top" />
    </Grid>
</navigation:Page>

Make sure you have all the third party components installed on the machine.

WP Apps - Color Search | Arctic | XKCD | Sound Meter | Speed Dial

I am using WPF, C#, Linq to Sql -- I have a stored procedure and I am trying to bind the results to a treeview two levels deep. Below is some of the code I thought might help understand better, I am not sure if I needed to post this much code, but I can remove the uneeded code. I am having trouble figuring out the bindings with the data-templates. Any suggestions or comments would be appreciated.

Here is part of the view model I am using

C#

public sealed class AViewModel : ViewModel
        {

          public sealed class ItemsToGet
          {
             public Guid? Id {get; set; }
             public int? TNumber { get; set;}
             public string Title { get; set; }
             public string Description { get; set; }
             public string FullName { get; set;}
          }

          //this is the parameter I am passing to the procedure
          private Guid mText = Guid.Empty;
          private ObservableCollection<ItemsToGet> mHistory = new ObservableCollection<ItemsToGet>();

          public ObservableCollection<ItemsToGet> History
          {
          get
            {
               return mHistory;
            }
          }

           public Guid SearchText
           {
                get
                {
                    return mText ;
                }
                set
                {
                    mText = value;
                    OnPropertyChanged("SearchText");
                }
           }

    //This Guid is just for testing the Procedure and binding etc.
    //mText = new Guid("579BC2EF-6681-4728-8CC5-9671C1D54A35");

             var itemlist = from s in context.GetHistory(mText)
                                           select new ItemsToGet()
                                           {
                                               Id = s.Id,
                                               TNumber = s.TNumber,
                                               Title = s.Title,
                                               Description = s.Description,
                                               FullName = s.FullName
                                            };

List<ItemsToGet> Results = itemlist.ToList();
mHistory.Clear();
Results.ForEach(b => mHistory.Add(b));

Here is the View Code Behind

C#

public partial class AView : UserControl
    {
        public AView()
        {
            InitializeComponent();
            AViewModel vm = this.DataContext as AViewModel;

        }
    }

Xaml -- I want to top level to display the Title, and the child(second level to be the TNumber)

XML

<TreeView ItemsSource="{Binding History}">

    <!--  template -->
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding History}">
                <TextBlock Foreground="Red" Text="{Binding Title}" />

            <!--  template -->
            <HierarchicalDataTemplate.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding History}">
                        <TextBlock Text="{Binding TNumber}" />

                    <!--  template -->
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding}" />
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>

                </HierarchicalDataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>

        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>

</TreeView>

</UserControl>

Here is a snapshot of what the results look like, there are more rows than this, but this is the format.

C#

//                 Id               TNumber    Title    Description    FullName
//D5C507FB-92FC-4179-BAB9-110928736428  1   Design 1    Random         John Doe
//D5C507FB-92FC-4179-BAB9-110928736428  2   Design 1    Another        John Two
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  1   Design 2    Random Two     Jane Doe
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  2   Design 2    Another Random Jane Two
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  3   Design 2    Third Random   Jane Three
//D34CC0DD-F67B-48D6-B0A6-D91F5A4B27E2  1   Design 3    Another Random John Does
//06468A50-CC07-4CEC-B2EC-1817B29DC783  1   Design 4    Full Random    John Jane
//06468A50-CC07-4CEC-B2EC-1817B29DC783  2   Design 4    Full text      Jane John

Trying to display it like below. Thanks for any comments or suggestions.

C#

Design 1
      --Tnumber 1
      --TNumber 2
Design 2
      --TNumber 1
      --TNumber 2
      --TNumber 3
Design 3
      --TNumber 1
ETC
ETC

A repost?
TreeView Databinding Issue WPF C#[^]

This is not good Sigh | :sigh:

You need 2 clases a Design class and a Tnumber class, your Design class must have an observable collection of Tnumbers.

Populate the Design class with the unique of the design field. In the tnumber collection add the records for each design type.

Binid your treeview to the design collection, bind the hierarchy template to the tnumber collection.

Never underestimate the power of human stupidity
RAH

Trying to use VisualTreeHelper.HitTest on a TreeView. I have two arbitrary items. TreeViewItem1 and TreeViewItem2. These items may appear anywhere on the tree and have any sort of relationship (different parents, etc.). I've gotten the top left point of the two items. pt1 and pt2. I want to find the visible TreeViewItems in between. So I did:

VisualTreeHelper.HitTest(ParentTreeView, new HitTestFilterCallback(A), new HitTestResultCallback(B), new GeometryHitTestParameters(new RectangleGeometry(new Rect(0, pt1.Y, ParentTreeView.ActualWidth, (pt2.Y + 1) - pt1.Y))));

HitTestFilterBehavior A(DependencyObject potentialHitTestTarget)
{
if (potentialHitTestTarget is TreeViewItemEx)
{
if (((UIElement)potentialHitTestTarget).IsVisible)
System.Diagnostics.Debug.WriteLine(potentialHitTestTarget);
}

return HitTestFilterBehavior.Continue;
}

HitTestResultBehavior B(HitTestResult result)
{
return HitTestResultBehavior.Continue;
}

This code is working for the most part, except it's also returning parent items that it shouldn't. If my tree looks like:

1
_2
__3

and the two items in question are 2 & 3, the hit-test also returns 1.

A more ugly example is:

Root
_NodeWithChildren1
_NodeWithChildren2
_NodeWithChildren3
__1
__2
__3

the tree looks exactly like that on the screen. The items in question are _NodeWithChildren3 and __1. The hit-test returns Root and _NodeWithChildren1 and _NodeWithChildren2 as well.

Any ideas? I have confirmed that I am getting the correct item1 & item2 that I think I am getting and I have confirmed that the points I am getting are correct as well.