Good afternoon,
I am using WPF.
I have the following class:
public partial class UserControl1 : UserControl
{
private TimeSpan timeMinutesInterval;
public TimeSpan TimeMinutesInterval
{
get { return timeMinutesInterval; }
set { timeMinutesInterval = value; }
}
public UserControl1()
{
this.InitializeComponent();
}
private void TimePickerNew_Loaded(object sender, RoutedEventArgs e)
{
}
}
What do I need for the property TimeMinutesInterval appears in the visual studio properties browser?
Thank U
Once you add the control to another control/window/etc., you can see the property under the Miscellaneous section of the properties window for that added control. Is that what you were looking for?
<Window x:Class="WpfApplication5.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication5"
Title="MainWindow" Height="350" Width="525">
<Grid>
<local:UserControl1 TimeMinutesInterval="0:5:0" />
</Grid>
Related
I've dumbed down the code as much as I could to try and get a working piece of code yet I'm still coming up short. Some advice would be appreciated.
I'm trying to get a DependencyProperty working, it's that simple and yet the data I'm setting on the main window isn't showing up in the user control.
In the MainWindow I'm setting the TextValue to "hi" in the xaml. TextValue is showing in the xaml up and compiling just fine so I'm pretty sure I have the DependencyProperty set right. Once the dialog is fully open I take a look in the debugger and my property TextValue is still null.
Am I missing setting the data context? Maybe I'm off base in what I'm looking to do.
Thanks for taking the time to figure out what I'm doing wrong.
My User Control is: UserControl1
Xaml:
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
Loaded="UserControl_Loaded"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
</Grid>
</UserControl>
UserControl1.xaml.cs is:
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for UserControl1.xaml
/// </summary>
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
public static readonly DependencyProperty TextProperty = DependencyProperty.Register("TextValue", typeof(string), typeof(UserControl1));
private string _tv;
public string TextValue
{
get
{
return _tv;
}
set
{
_tv = value;
}
}
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
}
}
}
My calling window xaml is:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:usercontrols="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525"
Loaded='Window_Loaded'>
<Grid>
<usercontrols:UserControl1 x:Name="usercontroltest1" TextValue="hi"/>
</Grid>
</Window>
My calling window .cs is:
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
}
}
}
The getter and setter of the "property wrapper" must call the GetValue and SetValue methods of the DependencyObject base class like shown below. Besides that, there is a naming convention that mandates that a dependency property's identifier field is named like the property plus a Property suffix. See Custom Dependency Properties for all the details.
public static readonly DependencyProperty TextValueProperty =
DependencyProperty.Register(
nameof(TextValue), typeof(string), typeof(UserControl1));
public string TextValue
{
get { return (string)GetValue(TextValueProperty); }
set { SetValue(TextValueProperty, value); }
}
In order to access a UserControl's dependency property in its own XAML, you would typically use a RelativeSource Binding like this:
<UserControl x:Class="WpfApplication1.UserControl1" ...>
<Grid>
<TextBlock Text="{Binding TextValue,
RelativeSource={RelativeSource AncstorType=UserControl}}" />
</Grid>
</UserControl>
I'm trying to get my head around WPF, Unity and MvvMlight (galasoft). So far my little set up works. If I run my application the label is filled with a random name generated by my DataService. (small victory getting all moving parts to work)
But in the design view of Visual Studio the label remains empty. How do i convince VisualStudio to render some 'design time' data in my label?
I'm using: Visual Studio Premium 2013, Unity 4.0.1, MvvmLight 5.2, .net 4.5
App.xaml.cs
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
IUnityContainer container = new UnityContainer();
container.RegisterType<IDataService, DataService>();
container.RegisterType<IMainViewModel, MainViewModel>();
MainWindow mainWindow = container.Resolve<MainWindow>();
mainWindow.Show();
base.OnStartup(e);
}
}
In App.xaml I have not defined the StartUpUri
MainWindow.xaml
<Window x:Class="UnityMvvmTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="300" Width="500">
<Grid>
<Label x:Name="myLabel" Content="{Binding MyText}"/>
</Grid>
</Window>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
public MainWindow(IMainViewModel theViewModel)
: this()
{
this.DataContext = theViewModel;
}
}
MainViewModel.cs
public class MainViewModel : ViewModelBase, IMainViewModel
{
private readonly IDataService _dataService;
public MainViewModel(IDataService dataService)
{
_dataService = dataService;
if (IsInDesignMode)
{
// Code runs in design time data.
MyText = "Design Data";
}
else
{
// Code runs "for real"
MyText = _dataService.GetName();
}
}
public string MyText { get; set; }
}
I found a method, using hints from https://stackoverflow.com/a/3380895/249845
I created a second (flat) implementation of IMainVieModel in a separate namespace: UnityMvvmTest.ViewModel.Design. This implementation has no logic, it just fills the properties so the designer has some data to display.
This implementation is used in design time, since it is specified as the DesignTime DataContext. (with xmlns:d, xmlns:mc and xmlns:vm). The mc-namespace is needed to hide the d-namespace during runtime, see why.
The result is 5 extra lines in the Xaml, an extra (almost empty) implementation of IMainViewModel. And an extra (empty) constructor in code behind, instead of a constuctor that test for IsInDesignMode. This isn't a big deal, since unity will pick the constructor with the most parameters it can resolve.
MainWindow.xaml
<Window x:Class="UnityMvvmTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:vm="clr-namespace:UnityMvvmTest.ViewModel.Design"
d:DataContext="{d:DesignInstance IsDesignTimeCreatable=True, Type=vm:MainViewModel}"
mc:Ignorable="d"
>
<Grid>
<Label x:Name="myLabel" Content="{Binding MyText}" />
</Grid>
</Window>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
// Contructor used in DesignTime
public MainWindow()
{
InitializeComponent();
}
//Constructor used by Unity
public MainWindow(IMainViewModel theViewModel)
: this()
{
this.DataContext = theViewModel;
}
}
MainViewModel.cs (design time implementation)
namespace UnityMvvmTest.ViewModel.Design
{
public class MainViewModel : IMainViewModel
{
public MainViewModel()
{
MyText = "my Design time data";
}
public string MyText { get; set; }
}
}
I have a WPF project with two windows, the first window firing events and have it's own event handlers, the other window will fire the same events, any idea how to use handlers in first window to handle events in second window ?
thanks to #Cody Gray , #keyboardP and to this useful article http://geekswithblogs.net/lbugnion/archive/2007/03/02/107747.aspx
Here's a code snippet to demonstrate the answer:
first step add a new subclass :
using System.Windows;
namespace WpfApplication
{
public class Subclass : Window
{
//Event handlers,functions or any potential reused code
}
}
Second step: go to window1.xaml.cs
namespace WpfApplication
{
public partial class Window1 : Subclass
{
public Window1()
{
InitializeComponent();
}
}
}
Third step: change the Xaml code for window1 as below:
<src:Subclass
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:WpfApplication"
Title="Window1" Height="350" Width="525">
</src:Subclass>
Finally do 2nd & 3rd steps for window2
A simple sample of what i was proposing in first place:
<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid>
<Window Loaded="Window_Loaded"/>
<Window Loaded="Window_Loaded"/>
</Grid>
</Window>
Look how both windows share the event handler:
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
//Whatever
}
}
At this point you should ask yourself if you really needed two windows, or any other container control could be enough.
I have been learning MVVM / WPF and have gone through the tutorial here.
I have created a working application using this methodology but now, on a new project, I cannot get the Dependency Injection to work.
When I run this project I get an empty MainWindow without the CompanyView injected. I have double and tripled checked everything between the project that works and this one that doesn't and cannot find the reason for CompanyView not being injected. I have also tried cleaning the solution and restarting VS to no avail. Hopefully someone can see what I am missing.
I have the following file:
App.xaml.cs (using base.OnStartup() instead of StartupUri in App.xaml)
namespace SidekickAdmin
{
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
MainWindow window = new MainWindow();
var viewModel = new MainWindowViewModel();
window.DataContext = viewModel;
window.Show();
}
}
}
MainWindowViewModel.cs
namespace SidekickAdmin.ViewModel
{
class MainWindowViewModel : ViewModelBase
{
public MainWindowViewModel()
{
CompanyViewModel companyViewModel = new CompanyViewModel(_repository);
this.ViewModels.Add(companyViewModel);
}
ObservableCollection<ViewModelBase> _viewModels;
ObservableCollection<ViewModelBase> ViewModels
{
get
{
if (_viewModels == null)
{
_viewModels = new ObservableCollection<ViewModelBase>();
}
return _viewModels;
}
}
}
}
MainWindowView.xaml
<Window x:Class="SidekickAdmin.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:SidekickAdmin.ViewModel"
xmlns:vw="clr-namespace:SidekickAdmin.View"
Title="Sidekick Admin" SizeToContent="WidthAndHeight">
<!-- Typically done in a resources dictionary -->
<Window.Resources>
<ResourceDictionary Source="MainWindowResources.xaml" />
</Window.Resources>
<StackPanel>
<ItemsControl ItemsSource="{Binding ViewModel}" Margin="3" />
</StackPanel>
</Window>
MainWindowResources.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:SidekickAdmin.ViewModel"
xmlns:vw="clr-namespace:SidekickAdmin.View">
<DataTemplate DataType="{x:Type vm:CompanyViewModel}">
<vw:CompanyView />
</DataTemplate>
</ResourceDictionary>
CompanyViewModel.cs (not really used yet as I am still trying to just get the view to appear)
namespace SidekickAdmin.ViewModel
{
class CompanyViewModel : ViewModelBase
{
readonly GenericRepository _repository;
#region Getters & Setters
public ObservableCollection<Company> AllCompanies
{
get;
private set;
}
#endregion
#region Constructors
public CompanyViewModel(GenericRepository repository)
{
if (repository == null)
{
throw new ArgumentNullException("repository");
}
_repository = repository;
this.AllCompanies = new ObservableCollection<Company>(_repository.GetAll<Company>());
}
#endregion
protected override void OnDispose()
{
this.AllCompanies.Clear();
}
}
}
CompanyView.xaml
<UserControl x:Class="SidekickAdmin.View.CompanyView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
Height="300" Width="300">
<StackPanel>
<TextBlock>You say Hello</TextBlock>
<TextBlock>And I say Goodbye</TextBlock>
<TextBlock>Hello, Hello</TextBlock>
</StackPanel>
</UserControl>
Lester's comment is right... you are binding to a ViewModel property which does not exist - MainWindowViewModel has a ViewModels property though. The s is important
Besides what #Robert Levy has wrote, the error you are making is that your ViewModels property is private, make it public and it should work fine.
#RobertLevy and #dmusial are correct. You need to make your reference to ViewModels in your XAML plural, to match the property name in your C# code. Also, the property should be public, so the View can see it.
I have a custom base user control in silverlight.
<UserControl x:Class="Problemo.MyBaseControl"
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"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<Border Name="HeaderControl" Background="Red" />
</Grid>
</UserControl>
With the following code behind
public partial class MyBaseControl : UserControl
{
public UIElement Header { get; set; }
public MyBaseControl()
{
InitializeComponent();
Loaded += MyBaseControl_Loaded;
}
void MyBaseControl_Loaded(object sender, RoutedEventArgs e)
{
HeaderControl.Child = Header;
}
}
I have a derived control.
<me:MyBaseControl x:Class="Problemo.MyControl"
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:me="clr-namespace:Problemo"
d:DesignHeight="300" d:DesignWidth="400">
<me:MyBaseControl.Header>
<TextBlock Name="header" Text="{Binding Text}" />
</me:MyBaseControl.Header>
</me:MyBaseControl>
With the following code behind.
public partial class MyControl : MyBaseControl
{
public string Text
{
get; set;
}
public MyControl(string text)
{
InitializeComponent();
Text = text;
}
}
I'm trying to set the text value of the header textblock in the derived control.
It would be nice to be able to set both ways, i.e. with databinding or in the derived control code behind, but neither work. With the data binding, it doesn't work. If I try in the code behind I get a null reference to 'header'. This is silverlight 4 (not sure if that makes a difference)
Any suggestions on how to do with with both databinding and in code ?
Cheers
First of all I'll show you how to adjust your Derived control to handle this. You need to do two things, first you need to implement INotifyPropertyChanged and secondly you to add the binding to the user control.
MyControl Xaml:-
<me:MyBaseControl.Header>
<TextBlock Name="headerItem" />
</me:MyBaseControl.Header>
MyControl code:-
public partial class MyControl : MyBaseControl, INotifyPropertyChanged
{
public MyControl ()
{
InitializeComponent();
headerItem.SetBinding(TextBlock.TextProperty, new Binding("Text") { Source = this });
}
string _text;
public string Text
{
get { return _text; }
set { _text = value; NotifyPropertyChanged("Text"); }
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
void NotifyPropertyChanged(string name)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
#endregion
}
This should get you working. However, as soon as you feel you need to inherit a UserControl based class you should take a step back and ask whether the base and derived items ought to be templated controls instead. If I get time I'll try to add a version of your code in terms of templated controls.