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Sabrías explicarme como hago lo que me dices. Gracias
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Sorry about the heading, but I really couldnt resist. The question is realted to arcitecture of the implementation of ViewModels in WPF, and its based on the application a wrote an article about here[^], and the code that Im wondering about changing to, hopefully, something better is this:
I have a MainViewModel class where I initiate a Property of ObservableCollections, that contains elements of this class:
Public Class RadioButtonProperies
Private _Text As String
Public Property Text() As String
Get
Return _Text
End Get
Set(ByVal value As String)
_Text = value
End Set
End Property
Private _Index As Integer
Public Property Index() As Integer
Get
Return _Index
End Get
Set(ByVal value As Integer)
_Index = value
End Set
End Property
Private _IsChecked As Boolean = False
Public Property IsChecked() As Boolean
Get
Return _IsChecked
End Get
Set(ByVal value As Boolean)
_IsChecked = value
If value Then
SelectionIndexChanged(Index)
End If
End Set
End Property
Public Event SelectionIndexUpdated(ByVal index As Integer)
Private Sub SelectionIndexChanged(ByVal index As Integer)
RaiseEvent SelectionIndexUpdated(index)
End Sub
End Class
As you can see, I Raise an event when the IsChecked property is set to true, and this event is also raised and passed on from the MAinViewModel class, so I can react if you changed the RadioButton selection on the MainWindow:
Private _Intersections As MainViewModel
Public Sub New()
InitializeComponent()
_Intersections = DirectCast(rbtn.DataContext, MainViewModel)
AddHandler _Intersections.SelectionIndexUpdated, AddressOf rbtnSelectionChanged
End Sub
Public Sub rbtnSelectionChanged(ByVal Value As Integer)
DrawingControl.DrawingCanvas.CanvasEvent = Value
End Sub
My question is this: theres got to be a more effective way of doing this, as my implementation is really cumbersome, and the more I look at it the more ridiculose it seems, and the more i dislike it.
What are the guidelines for implementing functionallity like this? Are there any other ways whitch is easyer or better? Any thoughts?
Regards
Kenneth
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class c#:
using System.Collections.ObjectModel;
namespace WpfApplication3
{
bindingListBoxTOstring.xaml
public partial class bindingListBoxTOstring : Window
{
ObservableCollection<ListBoxData> _ListBoxCollection =
new ObservableCollection<ListBoxData>();
public bindingListBoxTOstring()
{
InitializeComponent();
_ListBoxCollection.Add(new ListBoxData
{ Profilo = "netgear" });
_ListBoxCollection.Add(new ListBoxData
{ Profilo = "alice13" });
}
public ObservableCollection<ListBoxData> ListBoxCollection
{ get { return _ListBoxCollection; } }
public class ListBoxData
{
public string Profilo { get; set; }
}
}
}
in XAML which property should I use to make binding??
XAML code:
<Window x:Class="WpfApplication3.bindingListBoxTOstring"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="bindingListBoxTOstring" Height="300" Width="300">
<Grid>
<ListBox Height="100" HorizontalAlignment="Left"
Margin="108,67,0,0" Name="listBox1"
VerticalAlignment="Top" Width="120" />
</Grid>
</Window>
WPF, binding, ListBox
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In your ListBox, you need to set the ItemsSource to your ListBoxCollection. To do this, you would add ItemsSource="{Binding ListBoxCollection}" in the ListBox. You also need to set the DataSource - as you are just learning, I would suggest keeping it simple and put DataContext = this; immediately after the call to InitializeComponent();.
Finally, you need to actually display something in your ListBox - if you run the application as it stands, you won't see the underlying data because WPF has no way to tell that it should be displaying Profilo. What you want to do is add an ItemTemplate to your ListBox (I'll leave that to you to look up). So, your XAML will look like this:
<ListBox ItemsSource="{Binding ListBoxCollection}" ... put in your other settings here>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Profilo}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
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ok!! it works! 
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before taking this way, I would add items to the listbox like this:
void InserisciItemInListBox(string s, ListBox lb)
{
ListBoxItem lbi = new ListBoxItem();
lbi.Content = s;
lb.Items.Add(lbi);
}
after that, I check which item was selected
private void ListBoxSelectedPrintText(object sender, SelectionChangedEventArgs e)
{
ListBoxItem item = ((ListBox)sender).SelectedItem as ListBoxItem;
String itemText = (item != null) ? item.Content.ToString() : String.Empty;
tb.Text = " You selected " + itemText; ;
}
i've updated XAML
<ListBox ItemsSource="{Binding ProfiliCollection}"
Width="100" SelectionChanged="ListBoxSelectedPrintText"
...
now I can not extract the text of the item selected, how do I fix it?
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hello
I added a scrollbar, but it does not work
help me please
<ListView ItemsSource="{Binding GameCollection}" ScrollViewer.VerticalScrollBarVisibility="Visible">
here is the immgine of my problem
linkToSnap
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Hello, I have a DataGrid that I am using where the user clicks a button to add information to the DataGrid. I would like to set focus to the first cell when the user clicks the button. My previous code worked great in a plain ol' DataGridTextColumn, but no longer works.
Here is my XAML:
<DataGrid.Columns>
<DataGridTemplateColumn x:Name="partName"
Header="Part Name"
CanUserResize="True"
Width="225"
MinWidth="225">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock VerticalAlignment="Center" Focusable="True" FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}">
<Hyperlink NavigateUri="http://www.bing.com"
RequestNavigate="Hyperlink_RequestNavigate"
TextDecorations="None">
<TextBlock Text="{Binding Path=description}" x:Name="hyperLinkTextBlock"
FontSize="20"
FontWeight="Black"
TextWrapping="WrapWithOverflow"
TextDecorations="Underline"
Focusable="True"
FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>
</Hyperlink>
</TextBlock>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox FontSize="20"
FontWeight="Black"
HorizontalAlignment="Stretch"
VerticalContentAlignment="Center"/>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
And here is my C# code:
partsDataGrid.Focus();
partsDataGrid.UpdateLayout();
DataGridCellInfo cellInfo = new DataGridCellInfo (partsDataGrid.Items[0], partsDataGrid.Columns[0]);
partsDataGrid.CurrentCell = cellInfo;
partsDataGrid.BeginEdit();
What am I doing wrong? Thanks in advance!
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Just for anyone else, I discovered my problem. Even though I had set everything inside my DataGridTemplateColumn to focusable, I hadn't set focusable to true inside my CellStyle.
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I have a custom user control that inherits FrameWorkElement and draws some custom shapes on a canvas. I added this code to get the context menus for the item:
Sub New()
......
Dim contextmenu As New ContextMenu()
Dim mi As New MenuItem()
Dim mia As New MenuItem()
mi.Header = ("Item 1")
contextmenu.Items.Add(mi)
mia.Header = ("Item 2")
contextmenu.Items.Add(mia)
AddHandler contextmenu.MouseLeave, AddressOf CloseContextmenu
Me.ContextMenu = (contextmenu)
End Sub
Private Sub CloseContextmenu(ByVal sender As Object, ByVal e As Input.MouseEventArgs)
Me.ContextMenu.IsOpen = False
End Sub
Which does close the contextmenu, but not when you leave the menu, only when you click outside the contextmenu. My question is has anybody managed to close the contextmenu on mouse leave?
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Ok, I nearly sovled this myself, though its not the ideal solution:
If Mouse.RightButton = MouseButtonState.Pressed Then
If TypeOf (selectedElement) Is CustomElement Then
Dim ga As CustomLine = DirectCast(selectedElement, CustomElement)
Dim contextmenu As New ContextMenu()
Dim bord As New StackPanel
Dim mi As New MenuItem()
Dim mia As New MenuItem()
mi.Header = ("Item 1")
mia.Header = ("Item 2")
bord.Children.Add(mi)
bord.Children.Add(mia)
AddHandler bord.MouseLeave, AddressOf menuitem1_leave
contextmenu.Items.Add(bord)
contextmenu.IsOpen = True
ga.ContextMenu = (contextmenu)
End If
End If
with the mouse leave sub:
Private Sub menuitem1_leave(ByVal sender As Object, ByVal e As Input.MouseEventArgs)
Dim dep As DependencyObject = DirectCast(e.OriginalSource, DependencyObject)
While (dep IsNot Nothing) AndAlso Not (TypeOf dep Is ContextMenu)
dep = VisualTreeHelper.GetParent(dep)
End While
If dep Is Nothing Then
Exit Sub
End If
DirectCast(dep, ContextMenu).IsOpen = False
End Sub
Problem is that the items are messed up inside the ContextMenu, so it looks wierd. So the next question is does anybod have any ideas on how to do this properly?
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When I set AutoGenerateColumns = false, then I see no data. I see the data when AutoGenerateColumns = True. Here's my grid:
<DataGrid Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Margin="5"
ItemsSource="{Binding AccountItems}"
SelectedItem="{Binding SelectedAccountItem}"
AutoGenerateColumns="True">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Date"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding DisplayDate}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Memo 1"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Memo1}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Memo 2"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Memo2}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Debit"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Debit}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Credit"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Credit}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Balance"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Balance}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
What am I doing wrong here?
Thanks
If it's not broken, fix it until it is
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Not exactly sure but the http://msdn.microsoft.com/en-us/library/system.windows.controls.datagrid.autogeneratecolumns.aspx[^] seems to give an answer:
<DataGrid Name="DG1" ItemsSource="{Binding}" AutoGenerateColumns="True" AutoGeneratingColumn="DG1_AutoGeneratingColumn" />
and in the code behind:
private void DG1_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
string headername = e.Column.Header.ToString();
if (headername == "MiddleName")
{
e.Cancel = true;
}
if (headername == "FirstName")
{
e.Column.Header = "First Name";
}
else if (headername == "LastName")
{
e.Column.Header = "Last Name";
}
else if (headername == "EmailAddress")
{
e.Column.Header = "Email";
}
}
You could use the code and step through the code with the debugger, at least then you could see whats going on.
modified 20-Sep-12 18:10pm.
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Kenneth Haugland wrote: Windows Forms Designer
He's talking about WPF, not Windows Forms, and he's put what looks like well formed templates in there.
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Dang it... 
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Hard to say from that - we only have half the picture here. Tell you what, what do you see if you change the DataGridTemplateColumns into DataGridTextColumns? What appears in the text? Is the source correct then?
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That did it. Thanks Pete
If it's not broken, fix it until it is
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made stackedbarseries in silverlight to show "projects gantt chart"
now I wanna change the numbers shown in the Axes-X for example we have Worker John:
pr1: 201105 - 201115
pr2: 201120 - 201144
pr3: 201142 - 201207
etc...
so I made 2 series that the first seria is with tranceparent color then I make function that change the WW to range from 201101 (dont need before..) so the chart looks like:
pr1: 5-15
pr2: 20-44
pr3: 42-60 (53+7 or 52+7 depends on year)
now how can I change the Axes display to the original?
the code in xaml is:
<toolkit:Chart Name="ProjectChart" Title="Projects" Visibility="Visible" >
<toolkit:Chart.Series>
<toolkit:StackedBarSeries FontWeight="Bold" MouseLeftButtonUp="StackedBarSeries_MouseLeftButtonUp" MouseEnter="StackedBarSeries_MouseEnter">
<toolkit:SeriesDefinition ItemsSource="{Binding}" Visibility="Collapsed" Title="" Name="serEmpty"
DependentValueBinding="{Binding tranceparent_ser}"
IndependentValueBinding="{Binding projectName}"
>
<toolkit:SeriesDefinition.DataPointStyle>
<Style TargetType="toolkit:BarDataPoint">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush" Value="Transparent"/>
<Setter Property="BorderThickness" Value="0"/>
</Style>
</toolkit:SeriesDefinition.DataPointStyle>
</toolkit:SeriesDefinition>
<toolkit:SeriesDefinition ItemsSource="{Binding}" Title="Project" Name="serProjects"
DependentValueBinding="{Binding project_ser}"
IndependentValueBinding="{Binding projectName}">
<toolkit:SeriesDefinition.DataPointStyle>
<Style TargetType="toolkit:BarDataPoint">
<Setter Property="Background" Value="Blue"/>
<Setter Property="BorderBrush" Value="Blue"/>
<Setter Property="BorderThickness" Value="1"/>
</Style>
</toolkit:SeriesDefinition.DataPointStyle>
</toolkit:SeriesDefinition>
</toolkit:StackedBarSeries>
</toolkit:Chart.Series>
</toolkit:Chart>
thanks
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I have an XML file structured this way:
<Emulators>
<Settings>
<vol name="10"/>
<Volume>10</Volume>
<Keys name="key1" value="1" />
<Keys name="key2" value="2" />
<Keys name="key3" value="3" />
<Keys name="key4" value="4" />
</Settings>
<System>
<Name>name1</Name>
<Icon>name1.png</Icon>
<topplayed>
<Top>top1</Top>
<Top>top2</Top>
<Top>top3</Top>
</topplayed>
</System>
<System>
<Name>name2</Name>
<Icon>name2.png</Icon>
<topplayed>
<Top>top4</Top>
<Top>top5</Top>
<Top>top6</Top>
</topplayed>
</System>
</Emulators>
I get no difficulties binding to <settings> tag, as well as tags contained into it.
I get no difficulties to bind the <system> tag into a list box.....but I don't know how to bind to tags into <topplayed>.
How to populate a listbox with all <topplayed> elements of the currently selected <system>?
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="721" Width="525" Background="#FF4E4E64">
<Grid Name="Grid1">
<Grid.DataContext>
<XmlDataProvider x:Name="SystemData" Source="C:\Users\Portable\Desktop\taper\WpfApplication1\Resources\Systems2.xml" XPath="Emulators" />
</Grid.DataContext>
<Grid.Resources>
<DataTemplate x:Key="Resource1">
<Label Content="{Binding XPath=@name}"/>
</DataTemplate>
<DataTemplate x:Key="Resource2">
<Label Content="{Binding XPath=@value}"/>
</DataTemplate>
<DataTemplate x:Key="Resource3">
<Label Content="{Binding XPath=Name}"/>
</DataTemplate>
<DataTemplate x:Key="Resource4">
<Label Content="{Binding XPath=Top}"/>
</DataTemplate>
</Grid.Resources>
<TextBox Text="{Binding XPath=Settings/Volume}" Height="30" HorizontalAlignment="Left" Margin="12,12,0,0" Name="TextBox5" VerticalAlignment="Top" Width="196" />
<ListBox ItemsSource="{Binding XPath=Settings/Keys}" ItemTemplate="{StaticResource Resource1}" IsSynchronizedWithCurrentItem="True" Height="92" HorizontalAlignment="Left" Margin="12,48,0,0" Name="ListBox1" VerticalAlignment="Top" Width="196" />
<ListBox ItemsSource="{Binding XPath=Settings/Keys}" ItemTemplate="{StaticResource Resource2}" Height="92" HorizontalAlignment="Left" IsSynchronizedWithCurrentItem="True" Margin="214,48,0,0" Name="ListBox2" VerticalAlignment="Top" Width="196" />
<ListBox ItemsSource="{Binding XPath=System}" ItemTemplate="{StaticResource Resource3}" IsSynchronizedWithCurrentItem="True" Height="104" HorizontalAlignment="Left" Margin="12,185,0,0" Name="ListBox3" VerticalAlignment="Top" Width="196" />
<ListBox ItemsSource="{Binding XPath=System/topplayed}" ItemTemplate="{StaticResource Resource4}" Height="74" HorizontalAlignment="Left" Margin="12,295,0,0" Name="ListBox4" VerticalAlignment="Top" Width="196" />
</Grid>
</Window>
Thank you very much!!
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Hi All,
I need to play streaming videos like Live TV News and live Cricket etc. in my WPF Application.
I used Media Element But it did not worked out. If anyone has done that in any way please help me out.
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Take a look at the sticky at the top on how to ask a question, yours was not a good example and will not get the answer you want. Try reading some of the articles, work through the samples[^] there are plenty out there.
Never underestimate the power of human stupidity
RAH
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So I have this XAML code:
<Window.Resources>
<local:MainViewModel x:Key="ViewModel" />
</Window.Resources>
And this is the XAML for the actual control:
<StackPanel Orientation="Horizontal" Width="897" Margin="5" DataContext="{StaticResource ViewModel}">
<ItemsControl Width="897" ItemsSource="{Binding Intersections}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<WrapPanel Width="897" >
<RadioButton GroupName="Intersections"
Content="{Binding Text}"
IsChecked="{Binding IsChecked, Mode=TwoWay}" Width="150"/>
</WrapPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
In the code behind I have this public class:
Public Class MainViewModel
Sub New()
Intersections.Add(New Insertion() With {.Text = "Item 1"})
Intersections.Add(New Insertion() With {.Text = "Item 2", .IsChecked = True})
Intersections.Add(New Insertion() With {.Text = "Item 3"})
Intersections.Add(New Insertion() With {.Text = "Item 4"})
End Sub
Private _Intersections As New ObjectModel.ObservableCollection(Of Insertion)
Public Property Intersections() As ObjectModel.ObservableCollection(Of Insertion)
Get
Return _Intersections
End Get
Set(ByVal value As ObjectModel.ObservableCollection(Of Insertion))
_Intersections = value
End Set
End Property
Public Class Insertion
Private _Text As String
Public Property Text() As String
Get
Return _Text
End Get
Set(ByVal value As String)
_Text = value
End Set
End Property
Private _IsChecked As Boolean
Public Property IsChecked() As Boolean
Get
Return _IsChecked
End Get
Set(ByVal value As Boolean)
_IsChecked = value
End Set
End Property
End Class
End Class
The problem Im haveing is to get the RadioButtons to be shown Horizantaly, and I cant figure out how to do that. I have tried to set IsItemsHost="True" but Its giving me the error "A panel with IsItemsHost="true" is not nested in an ItemsControl. Panel must be nested in ItemsControl to get and show items.". Either I heave tried to do this in all the wrong places or Im missing some key information here.
To be clear the code works, but its giving me a stack of the RadioButtons, but I want the side by side like a WrapPanel.
The example is taken from here here[^], and I converted it to VB from C#.
modified 17-Sep-12 13:49pm.
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Use ItemsPanelTemplate and put the radio buttons horizontally inside a stack panel.
E.g.
<ItemsControl.ItemTemplate>
<ItemsPanelTemplate>
<StackPanel Orientation='Horizontal' "/>
</ItemsPanelTemplate>
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I tried this:
<StackPanel Orientation="Horizontal" Width="897" Margin="5" DataContext="{StaticResource ViewModel}">
<ItemsControl Width="897" ItemsSource="{Binding Intersections}">
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal">
<RadioButton GroupName="Intersections"
Content="{Binding Text}"
IsChecked="{Binding IsChecked, Mode=TwoWay}" Width="150"/>
</StackPanel>
</ItemsPanelTemplate>
</ItemsControl>
</StackPanel>
But this time it wont build properly with ItemsPanelTemplate, I have seen this on the webbefore also, but couldnt get it to work, Can you?
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