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Christian Graus wrote: I am surprised that you can create an observable collection with so little code, all the examples I have seen, use more.
I'm a minimalist by nature. Remember - I started programming when having 4K of RAM was considered "downtown".
Christian Graus wrote: If you're setting the binding context of the window, or the control, then you don't need to tell anything the variable name, it's already there in the binding context.
But how can it know if I don't tell it what data member to use?
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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OK, then I guess this is the issue. You have to set the DataContext of the control or the page ( depending on the XAML, I believe ) to be that list. I am not sure, but I think if you set the data context of the page ( which can be done in the XAML ) then the control will 'inherit' it.
I've just checked my code, and I tend to do it in the code, not the XAML.
playlists.DataContext = Playlists.GetFilesNotIn(list);
sets the data context of a control to a list of objects. I use an observable collection elsewhere, but the code is the same.
Christian Graus
Driven to the arms of OSX by Vista.
"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )
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Christian Graus wrote: strong typing is, I am pretty sure, what the extra code I've seen adds to the equation
What advantage does that have over ObservableCollection<T> ?
This seems pretty simple to me:
public class MyItemCollection : ObservableCollection<Item>
{
}
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Christian Graus wrote: I am surprised that you can create an observable collection with so little code, all the examples I have seen, use more.
I now realize what you're talking about. The auto-encode stuff ignored the type specifier after the word ObservableCollection.
I fixed it.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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Well, I moved the DataContext assignment into the code instead of the XAML, and I also noticed that ALL of my field names were incorrect, but even after fixing them, I get nothing in my listview (even though the collection contains items, and I've verified this through the debugger).
I haven't got a clue as to why the items aren't showing up.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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John Simmons / outlaw programmer wrote: I moved the DataContext assignment into the code
Which element's DataContext are you assigning to?
I also can't see where you are binding your ListView's ItemsSource
(maybe I missed it)...
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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I'm assigning the collection to the listview's datacontext like so:
m_workTrayData = new UDPWorkTrayItems();
this.listViewWorkTray.DataContext = m_workTrayData;
The ItemsSource is being set like so:
<Setter Property="ItemsSource" Value="{Binding Source={StaticResource WorkTrayData}}" ></Setter>
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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Two different source collections?
If you want to keep the
m_workTrayData = new UDPWorkTrayItems();
this.listViewWorkTray.DataContext = m_workTrayData;
then the ItemsSource binding should be
<Setter Property="ItemsSource" Value="{Binding}" />
and m_workTrayData will be the collection bound to the ListView.
If you want to use the collection object defined in XAML ("WorkTrayData")
then your binding sould be fine, but WorkTrayData is the collection you want to
add objects to.
Here's a quick and dirty way to check if your ItemsSource is bound correctly
(note I used WindowTitle and WindowSource - adjust for actual property names) :
m_workTrayData = new UDPWorkTrayItems();
this.listViewWorkTray.DataContext = m_workTrayData;
<Window.Resources>
<Style TargetType="{x:Type ListView}" >
<Setter Property="ItemsSource" Value="{Binding}" />
</Style>
</Window.Resources>
...
<Grid>
<ListView Name="listViewWorkTray">
<ListView.View>
<GridView>
<GridViewColumn Header="WindowTitle" Width="100" DisplayMemberBinding="{Binding Path=WindowTitle}"></GridViewColumn>
<GridViewColumn Header="WindowSource" Width="100" DisplayMemberBinding="{Binding Path=WindowSource}"></GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
That should show you if your collection is bound correctly.
Mark Salsbery
Microsoft MVP - Visual C++
modified on Friday, April 24, 2009 4:59 PM
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Mark Salsbery wrote: If you want to keep the
m_workTrayData = new UDPWorkTrayItems();
this.listViewWorkTray.DataContext = m_workTrayData;
then the ItemsSource binding should be
<setter property="ItemsSource" value="{Binding}">
That was the answer.  It's now displaying the text part. The image isn't showing. Should I be using a Converter even if the Image in the WorkTrayItem is an actual Image object that I'm retrieving from the window object? I'm off to search google, and I'll be checking back frequently to see if you've responded (or to post my success/failures).
Many thanks for your help on this.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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You don't need a converter if the property binded to is the right type.
In WPF, "Image" is a UIElement, not the actual image data.
For binding to Image.Source, the bound-to type should be System.Windows.Media.ImageSource
(or derived).
Here's an example, using an imagesource for a JPEG image added to the project
as a resource:
public class WorkTrayItem
{
public ImageSource WindowImage { get; set; }
public WorkTrayItem(...)
{
WindowImage = new BitmapImage(new Uri(@"pack://application:,,,/Images/someimageresource.jpg", UriKind.RelativeOrAbsolute));
}
}
Now, in your template, if you bind your Image.Source to WindowImage
<Image Margin="3" Source="{Binding WindowImage}"/>
you should see your image.
Mark Salsbery
Microsoft MVP - Visual C++
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Hi.
I'm going to create a ListView template. But when I've done it , I can't add items into the ListView !!!
I think , I don't do in correct way.
Could you guide me , how we can create a template for a ListView ?
Thanks.
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Can you post a simple example of your ListView and template code?
And how are you trying to add items?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: Can you post a simple example of your ListView and template code?
Sure. this is the XAML of my template :
<ControlTemplate x:Key=<span style="color:#A31515;">"ListViewTemplate"</span> TargetType=<span style="color:#A31515;">"{x:Type ListView}"</span>>
<StackPanel Orientation=<span style="color:#A31515;">"Horizontal"</span>>
<StackPanel>
<GridViewColumnHeader Content=<span style="color:#A31515;">"Icon"</span> x:Name=<span style="color:#A31515;">"Icon"</span> MinWidth=<span style="color:#A31515;">"34"</span>/>
<ListViewItem Content=<span style="color:#A31515;">"item"</span>/>
</StackPanel>
<StackPanel>
<GridViewColumnHeader Content=<span style="color:#A31515;">"Title"</span> x:Name=<span style="color:#A31515;">"Title"</span> MinWidth=<span style="color:#A31515;">"85"</span>/>
<ListViewItem Content=<span style="color:#A31515;">"item"</span>/>
</StackPanel>
<StackPanel>
<GridViewColumnHeader Content=<span style="color:#A31515;">"Username"</span> x:Name=<span style="color:#A31515;">"Username"</span> MinWidth=<span style="color:#A31515;">"80"</span>/>
<ListViewItem Content=<span style="color:#A31515;">"item"</span>/>
</StackPanel>
<StackPanel>
<GridViewColumnHeader Content=<span style="color:#A31515;">"Password"</span> x:Name=<span style="color:#A31515;">"Password"</span> MinWidth=<span style="color:#A31515;">"80"</span>/>
<ListViewItem Content=<span style="color:#A31515;">"item"</span>/>
</StackPanel>
<StackPanel>
<GridViewColumnHeader Content=<span style="color:#A31515;">"URL"</span> x:Name=<span style="color:#A31515;">"url"</span> MinWidth=<span style="color:#A31515;">"160"</span>/>
<ListViewItem Content=<span style="color:#A31515;">"item"</span>/>
</StackPanel>
</StackPanel>
</ControlTemplate>
Mark Salsbery wrote: And how are you trying to add items?
listview.Items.Add("an item");
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Your template doesn't have a place to display the added items.
Maybe try something like this:
<ListView Name="listview" >
<ListView.View>
<GridView AllowsColumnReorder="False" >
<GridViewColumn Header="Icon" Width="34" ></GridViewColumn> <!--DisplayMemberBinding="{Binding Path=...}"-->
<GridViewColumn Header="Title" Width="85" ></GridViewColumn>
<GridViewColumn Header="Username" Width="80" ></GridViewColumn>
<GridViewColumn Header="Password" Width="80" ></GridViewColumn>
<GridViewColumn Header="URL" Width="160" ></GridViewColumn>
</GridView>
</ListView.View>
</ListView>
Mark Salsbery
Microsoft MVP - Visual C++
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Thanks Mark, but we can't use ListView tag within ControlTemplate tag !!!
Isn't it ?
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the items presenter to show the items.
Here's a default template for a ListView you can use as a starting place:
<SolidColorBrush x:Key="ListBorder" Color="#828790"/>
<Style x:Key="ListViewStyle1" TargetType="{x:Type ListView}">
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
<Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListView}">
<Border x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="1">
<ScrollViewer Padding="{TemplateBinding Padding}" Focusable="false">
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</ScrollViewer>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Mark Salsbery
Microsoft MVP - Visual C++
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The link wasn't helpful .
I've used ItemsPresenter
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i have a problem with binden 2 controls. one is in the headertemplate and the other one is in the celltemplate. as you can see i have a checkbox(x:Name="chboCheckAll") in my headertemplate and the other checkbox is in the celltemplate(x:Name="chboCheckOld"). what i want is that when i check the checkbox in my headertemplate the checkbox in my celltemplate gets update with the value in the headertemplate. how can i achieve this?? thank you for the help
<my:DataGridTemplateColumn>
<my:DataGridTemplateColumn.HeaderTemplate >
<DataTemplate>
<Border x:Name="border">
<Grid x:Name="grid">
<CheckBox x:Name="chboCheckAll" Grid.Column="1" IsChecked="True"></CheckBox>
</Grid>
</Border>
</DataTemplate>
</my:DataGridTemplateColumn.HeaderTemplate>
<my:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<CheckBox x:Name="chboCheckOld" Content="{Binding Path=Old}" IsChecked="{Binding ElementName=chboCheckAll, Path=IsChecked}></CheckBox>
</StackPanel>
</DataTemplate>
</my:DataGridTemplateColumn.CellTemplate>
</my:DataGridTemplateColumn>
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If I was doing this, I'd normally update the model behind this, and let binding update the checkboxes rather than specifically update the checkboxes.
"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
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Congrats Pete. Saw your article in yesterday's "UK MSDN Flash". 
modified 1-Aug-19 21:02pm.
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Thanks for that. It was a real problem keeping an article I'm passionate about down to 500 words. There was a severe amount of pruning involved.
"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
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Hi,
I have a datatable as
DataTable dt = new DataTable( "Table1" );
dt.Columns.Add( "c1" );
dt.Columns.Add( "c2" );
dt.Columns.Add( "c3" );
DataRow dr = dt.NewRow();
dr["c1"] = "100";
dr["c2"] = "100";
dr["c3"] = "100";
dt.Rows.Add( dr );
dt.AcceptChanges();
printListView.DataContext = dt;
I have also a listview for showing the table.
<ListView
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Stretch"
SelectionMode="Single"
ItemsSource="{Binding}"
Name="printListView"
Margin="10">
<ListView.View>
<GridView>
<GridViewColumn Header="c1" DisplayMemberBinding="{Binding c1}"/>
<GridViewColumn Header="c2" DisplayMemberBinding="{Binding c2}"/>
<GridViewColumn Header="c3" DisplayMemberBinding="{Binding c3}"/>
</GridView>
</ListView.View>
</ListView>
How can I print this table?
Thanks
Prajeesh Prabhakar
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What I would do is create a FixedDocument which contains a Table that uses the datasource that you are using here, rather than using a ListView. Then, you use a DocumentPaginator and use this with PrintDialog.PrintDocument.
"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
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How do you change the protection level of a control within a usercontrol when said usercontrol is in a WPF usercontrol library?
In my solution, I have a a WPF UserControl library project that contains several UserControl objects.
Ive got a WPF Application project that contains a window object that uses two user controls - one is a toolbar (in the library project), and the other is a general content control in the application project.
I'm trying to add a button handler for a toolbar button. Because the controls inside a user control are all marked as "internal", I can't add a button handler in the "code behind" (what a stupid f*ckin way to have to say "real goddamn code", but I gigress).
So how do I accomplish what I want if all the frakking controls are internal?
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
modified on Wednesday, April 22, 2009 10:20 AM
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You probably want your toolbar button to be bound to a command:
Open...
If it is a standard command, such as file open, use the commands provided by the ApplicationCommands class as shown above. If not, create and register your own new command (must be static).
In your app code, bind a method to that command. That method will get called when the command "is raised". It's just like registering for an event, with one level of decoupling.
This "decoupling" between the UI and the rest of the app is a key idea of WPF. In WPF, you should not be directly linking to event handlers of a specific button. By using a command, the UI can be changed from a button to some other control type, and the command is still the same. If you wiered up directly to the event handler, then if you change the button to another type, you would have to find all places that event was being handled, and then change the event handler signature.
I've only been using WPF for about 2 months, and I share your frustration. You must see the WPF light  resistance is futile...
Mitch
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