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Ah, yes, I didn't like the static value or Dictionary either, so I ended up using a delegate instead:
elements.CollectionChanged -= (sender, ee) => MyCollectionChangedHandler(cv, sender, ee);
private static void MyCollectionChangedHandler(MyCanvas cv, object sender, NotifyCollectionChangedEventArgs e)
I also thought they static members were shared everywhere in the application, but I made the attached property code below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace MyApplication
{
public static class TextBoxUpdateExplicitBinding
{
private static TextBox tb;
private static List<TextBox> MyList;
static TextBoxUpdateExplicitBinding()
{
MyList = new List<TextBox>();
}
#region "UpdateSourceOnKeyProperty"
public static readonly DependencyProperty UpdateSourceOnKeyProperty =
DependencyProperty.RegisterAttached(
"UpdateSourceOnKey",
typeof(Key),
typeof(TextBoxUpdateExplicitBinding),
new FrameworkPropertyMetadata(Key.None, KeyChanged));
public static void SetUpdateSourceOnKey(UIElement element, Key value)
{
element.SetValue(UpdateSourceOnKeyProperty, value);
}
public static Key GetUpdateSourceOnKey(UIElement element)
{
return (Key)element.GetValue(UpdateSourceOnKeyProperty);
}
private static void KeyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
tb = (TextBox)obj;
if (!MyList.Contains(tb))
{
MyList.Add(tb);
tb.PreviewKeyDown += TextBoxKeyDown;
}
}
#endregion
static void TextBoxKeyDown(object sender, KeyEventArgs e)
{
tb = (TextBox)sender;
if (tb == null) return;
var propertyValue = (Key)tb.GetValue(UpdateSourceOnKeyProperty);
if (e.Key != propertyValue) return;
var bindingExpression = tb.GetBindingExpression(TextBox.TextProperty);
if (bindingExpression != null) bindingExpression.UpdateSource();
}
public static DependencyProperty BindProperty = DependencyProperty
.RegisterAttached("Bind",
typeof(bool),
typeof(TextBoxUpdateExplicitBinding),
new PropertyMetadata(AttachCommand));
public static void SetBind(DependencyObject d, bool command)
{
d.SetValue(BindProperty, command);
}
private static void AttachCommand(DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
(d as Button).Click += Button_Click;
}
private static void Button_Click(object sender, RoutedEventArgs e)
{
var bindingExpression = tb.GetBindingExpression(TextBox.TextProperty);
if (bindingExpression != null) bindingExpression.UpdateSource();
}
}
}
I now used this in a separate user contol:
<TextBox x:Name="tb" Grid.Column="0" local:TextBoxUpdateExplicitBinding.UpdateSourceOnKey="Return"
Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:SearchControl}},
Path=SearchText,
UpdateSourceTrigger=Explicit,
Mode=OneWayToSource }"/>
<Button Grid.Column="1" local:TextBoxUpdateExplicitBinding.Bind="True" >
<ContentControl>
<Image Source="pack://application:,,,/Icons/Search.png" Height="20" Width="20"/>
</ContentControl>
</Button>
And if I now added several of this user control in the same window, they didnt seem to share the static values in the attatched property. That's why I wondered.
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Hey all, I have done UITests on Android, iOS, and Windows 10 apps, but now I have to develop and app that needs desktop support too. WPF seems to be the best way to support < Windows 10 devices to me, but I am interested if I Microsoft provides a library I can use to run UITests on a WPF application? Are there any libraries like this?
i cri evry tiem
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Good Day
i have a code which is fired on the Button click even
Status.Background = new SolidColorBrush(Colors.Orange);
Status.Content = "Exporting, please wait...";
Logger.ExportLogToExcel();
Status.Background = new SolidColorBrush(Colors.Yellow);
Status.Content = "Exported to Excel Successfully";
What is Part 1 not working. Basically , i am Exporting to Excel , and i am changing the Label that shows the status, i am changing the color and also the contents. but the Dont change i only see "Exported to Excel Successfully"
I thought might be that the Export is quick to a point that it immediately jump to Success message. i added a thread to make to sleep for a few seconds before it can export so i see a different background.
Thanks
Vuyiswa Maseko,
Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vimalsoft.com
vuyiswa[at]vimalsoft.com
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I am guessing that everything is done on the main thread so the UI thread locks until the method is completed and the last colour change is effected.
Unless you do the export on a separate thread you are not going to see the initial colour change. putting in a delay does not help, move the export to a BGW thread.
Never underestimate the power of human stupidity
RAH
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i actually tried that initially. by setting the color from another Thread and the Export is obviously in another thread. but still the issue remains , let me keep trying something will post the feedback if i get to the solution.
Vuyiswa Maseko,
Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vimalsoft.com
vuyiswa[at]vimalsoft.com
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No no no, you set the colour BEFORE you launch the BGW that exports the excel, in the BGW compleate method you set the colour the second time.
This allows the UI to refresh while the BGW is working.
Never underestimate the power of human stupidity
RAH
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You are 100% Right, i was missing Something. its now working like charm.
Vuyiswa Maseko,
Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vimalsoft.com
vuyiswa[at]vimalsoft.com
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- How do you unit test a piece of UI becoming visible/invisible? The bound bool may be correct, but the converter could fail.
- How do you unit test data validations?
If it's not broken, fix it until it is
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Kevin Marois wrote: How do you unit test a piece of UI becoming visible/invisible? The bound bool may be correct, but the converter could fail. If you're that worried about the converter, you would write a UI automation test. However, a better bet would be to write a unit test for your converter to ensure it responds to changes (this is assuming you aren't using the standard visibility converter for some reason - but why would that one fail).
Kevin Marois wrote: How do you unit test data validations? Again, you test the underlying logic. If you are worried about UI behaviour, write UI automation tests.
This space for rent
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Thanks.
I'm trying to write units tests to test acceptance criteria, and some of states "When this is true then this UI part should visible".
So it's not really about the converter as much as it is aligning tests with acceptance with the idea being that after any form of refactoring, the UI part is still respecting the condition.
If it's not broken, fix it until it is
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In which case, a Coded Unit Test[^] is probably going to be your best bet.
This space for rent
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Pete O'Hanlon wrote: (this is assuming you aren't using the standard visibility converter Where be this standard converter!
I have a bunch of converters that I call standard I did not know there are built in converters!
Never underestimate the power of human stupidity
RAH
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System.Windows.BooleanToVisibilityConverter. There are other converters that do things for you behind the scenes such as this[^] puppy.
This space for rent
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Thank you, that gets rid of a folder of converters I have been using for ages. CP continues to be of value.
Never underestimate the power of human stupidity
RAH
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You're welcome. I have to admit that I'm not the biggest fan of converters - they do tend to be misused a lot to by people trying to shoehorn functionality in that either belongs in a VM, or which can readily be done with triggers.
This space for rent
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hi i am using wpf vs.net 2012 to do a simple optimization program for myself.
my goal is to load from a png file and be able to print the file to a a4 size paper after editing it a little(like adding my name).
at the moment i am using canvas control hold and print the image from.
i notice that this does not seems to be the best option. is there a more efficient way then using canvas?
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Hello,
I'm looking for a simple XAML + C# code the does the following:
Upon application launch, loading 3 icons from png files into an image list.
On runtime (e.g every 1 sec) a new line is added to a ListView. Each row contains an icon + label.
The icon can be one out of the 3 previously loaded icons.
The XAML I currently have is (not sure it's OK):
<Window.Resources>
<sys:String x:Key="icon1">icon1.png</sys:String>
<sys:String x:Key="icon2">icon2.png</sys:String>
<sys:String x:Key="icon3">icon3.png</sys:String>
</Window.Resources>
...
<ListView x:Name="listView1" >
<ListView.ItemTemplate>
<DataTemplate>
<Image Source="{Binding}" Stretch="None" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Can you please send a C# code ?
Best regards,
Z.V
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Sorry, but we don't write your code for you.
Why don't you try it yourself first, and then if you have a specific question, come back to ask it. If you do that, people will gladly help you.
The difficult we do right away...
...the impossible takes slightly longer.
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Hello,
I used the following XAML code:
<StackPanel x:Name="grd">
<ListView x:Name="listView">
<ListView.View>
<GridView>
<GridViewColumn Header="Severity" DisplayMemberBinding="{Binding Icon}"/>
<GridViewColumn Header="Id" DisplayMemberBinding="{Binding Id}"/>
<GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}"/>
<GridViewColumn Header="Immagine" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding ImagePath}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</StackPanel>
</Window>
And the following C# code:
public partial class MainWindow : Window
{
public class MyItem
{
public string Icon { get; set; }
public int Id { get; set; }
public string Name { get; set; }
public string ImagePath { get; set; }
}
public MainWindow()
{
InitializeComponent();
MyItem Item = new MyItem();
Item.Icon = "1";
Item.Id = 0;
Item.Name = "Zvika";
Item.ImagePath = "icon1.png";
this.listView.Items.Add(Item);
}
}
I also added the file icon.png to the project.
Now it works.
Regards,
Z.V
modified 30-Dec-15 21:44pm.
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I know that is an aberration but I am building a TreeListView where the Tree Column [0] is fixed and the following columns are dynamically created as a collection of columns in the viewmodel. The code behind then adds the columns to the TreeListView when they are built.
The creation of the columns is done on a BGW and a message is generated for the code behind to consume in the BGW complete method.
However the Message is complaining that it is on the wrong thread.
VM BGW Complete Method
private void NavComplete(object sender, RunWorkerCompletedEventArgs e)
{
worker.DoWork -= LoadTreeStuff; ;
worker.RunWorkerCompleted -= NavComplete; ;
if (e.Result != null)
{
MessageBox.Show(e.Result.ToString());
}
BusyIndicator = false;
AppMessages.MessageObject.Send("ColumnsReady");
}
I would have thought the AppMessage.MessageObject.Send would be on the main application thread.
public static class MessageObject
{
public static void Send(object oPayload)
{
Messenger.Default.Send<object>(oPayload);<-------Errors
}
<pre>
public static void Register(object recipient, Action<object> action)
{
Messenger.Default.Register<object>(recipient, action);
}
public static void UnRegister(object recipient)
{
Messenger.Default.Unregister<object>(recipient);
}
}</pre>
with the following error
Quote: The calling thread cannot access this object because a different thread owns it.
Any suggestions other than getting rid of the BGW (works perfection when it is removed)
Never underestimate the power of human stupidity
RAH
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Wrap the code that's failing in a Dispatcher.Invoke (or Dispatcher.BeginInvoke) to marshall the code back to the correct thread.
This space for rent
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I'm learning WPF. Over the past couple of days, I've worked my way through one-way binding, two-way binding, and list binding. For each of these, I created my own model classes to hold the data displayed on the window.
Now I'm tackling Entity Framework. Instead of using my own model classes, I want to use a data model created by the Entity Framework designer. I just tried it and it works beautifully. Even though it works, however, there is one thing I don't understand: Why does Visual Studio think I need a database?
For my simple test project, I'm not using any persistent data, and therefore I don't need a database. In my code, I create a Data Model Container and interact only with the in-memory version of the data (which I believe is done by specifying "Local" whenever referring to a table). Even though I don't need a database, Visual Studio kept giving me warnings related to the "Table Mapping" until I created one. After I created a database and connection string, everything worked properly with no errors or warnings.
As a test, I then deleted the database and changed the connection string in App.config to something bogus. Everything continued to work properly, indicating that the database and connection string are unused. It is only when I delete the connection string completely that I get errors again.
So my question is this: Why is Visual Studio insisting that I have a connection string which it obviously isn't using?
-TC
PS: I suppose this question is about Entity Framework more than WPF, but I came to the question through my research on WPF, so I hope it is appropriate for this forum. If not, let me know and I'll gladly repost elsewhere.
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Caveat - I am extremely prejudiced...
Entityframework is the work of satan, it wraps up your data management and ORM into a black box and then feeds you the nice, sanitised data titbits. It also tries to do everything for everyone and is therefore a monster.
You end up with a programmer who knows how to use EF but does not understand the underlying data management or how the ORM works and how he got his sanitised object. When it does go wrong they will try and work around it withing the EF structure, not understanding the fundamental problem that caused the error!
If you do not need a database (you will for your production system) are yo even contemplating including EF in you project.
Never underestimate the power of human stupidity
RAH
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