i have an app in MVVM pattern ; it contains one textbox and one button;
i add a validation that if textbox is empty , textbox color change to red;
and at this point i want that the button enable be false till the user
enter character in textbox and then button enable change to true;
my XAML Code is:
<Window.Resources>
<ControlTemplate x:Key="ErrorTemplate">
<DockPanel LastChildFill="True">
<Border BorderBrush="Pink" BorderThickness="1">
<AdornedElementPlaceholder />
</Border>
</DockPanel>
</ControlTemplate>
<Style TargetType="TextBox">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={x:Static RelativeSource.Self},Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBox Margin="10" Text="{Binding ValidateInputText,UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=True, ValidatesOnExceptions=True}"
Validation.ErrorTemplate="{StaticResource ErrorTemplate}">
</TextBox>
<Button Margin="10" Grid.Row="2" Command="{Binding ValidateInputCommand}"/>
and my command class is:
public class RelayCommand : ICommand
{
private Action WhatToExcute;
private Func<bool> WhenToExecute;
public RelayCommand(Action what,Func<bool>when )
{
WhatToExcute = what;
WhenToExecute = when;
}
public event EventHandler CanExecuteChanged;
public bool CanExecute(object parameter)
{
return WhenToExecute();
}
public void Execute(object parameter)
{
WhatToExcute();
}
}
and my viewmodel is:
public class ViewModel : IDataErrorInfo , INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
Product product = new Product();
public ViewModel()
{
ValidateInputCommand = new RelayCommand(action, valid);
}
public void action()
{
}
public bool valid()
{
if (product.Name == null)
return false;
return true;
}
public string ValidateInputText
{
get { return product.Name; }
set {
product.Name = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(ValidateInputText));
}
}
}
public RelayCommand ValidateInputCommand { get; set; }
public string this[string columnName]
{
get
{
if ("ValidateInputText" == columnName)
{
if (String.IsNullOrEmpty(ValidateInputText))
{
return "Please enter a Name";
}
}
return "";
}
}
public string Error
{
get
{
throw new NotImplementedException();
}
}
}
now when i run my app , the color of text box is red and when i enter a
character it change to normal that is ok but the
button enable is false and does not change
so i could not click button.
what should i do?
The CanExecuteChanged event on your RelayCommand never gets fired. Therefore the button to which the command has been bound will never re-evaluate its IsEnabled status. Your view model could notify the command on changes in its valid status and the command should in turn raise its CanExecuteChanged event.
Related
I am having problem with the following code. I have a TreeView Control which is bound to a Collection. The TreeView does get populated with the desired results. HOwever the "IsSelected" property and ContextMenu's click Command is not firing. Following is the XAML code.
<UserControl x:Class="Plan.Views.PadView"
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"
xmlns:v="clr-namespace:Planner.Views"
xmlns:vm="clr-namespace:Planner.ViewModels"
<Grid>
<StackPanel Orientation="Vertical">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<StackPanel Grid.Row="1" Grid.Column="0" Orientation="Horizontal" OpacityMask="#FFECF5F5">
<TreeView ItemsSource="{Binding Pads}" Name="tree_View" Width="190">
<TreeView.ItemContainerStyle >
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsSelected" Value="{Binding WellPadViewModel.IsSelected}" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Header="Rename" Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type TreeView}}, Path=DataContext.RenameCommand}" />
</ContextMenu>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle >
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Members}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" >
<TextBlock.InputBindings>
<KeyBinding Key="F2" Command="{Binding RenameCommand}"/>
</TextBlock.InputBindings>
</TextBlock>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</StackPanel>
</Grid>
</StackPanel>
</Grid>
</UserControl>
And here is my ViewModel
using System;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Input;
using System.ComponentModel;
using WPFApplication;
namespace FieldPlanner.ViewModels
{
public class PlanViewModel : BaseViewModel
{
Collection<Pads> pads = new Collection<Pads>();
public PlanViewModel()
{
IsSelected = true;
pads = new Collection<Pad>();
}
private ICommand _RenameCommand;
public ICommand RenameCommand
{
get
{
if (_RenameCommand == null)
{
_RenameCommand = new RelayCommand1((o) =>
{
// Your logic should go here
MessageBox.Show("Please rename me");
});
}
return _RenameCommand;
}
}
public ObservableCollection<PadInfo> Members { get; set; }
private static object _selectedItem = null;
// This is public get-only here but you could implement a public setter which also selects the item.
// Also this should be moved to an instance property on a VM for the whole tree, otherwise there will be conflicts for more than one tree.
public static object SelectedItem
{
get { return _selectedItem; }
private set
{
if (_selectedItem != value)
{
_selectedItem = value;
OnSelectedItemChanged();
}
}
}
public static void OnSelectedItemChanged()
{
// Raise event / do other things
}
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
if (_isSelected != value)
{
_isSelected = value;
OnPropertyChanged("IsSelected");
if (_isSelected)
{
SelectedItem = this;
}
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
var handler = this.PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
/// <summary>
/// Class to hold the Pads info for a tree
/// </summary>
public class Pad
{
/// <summary>
/// Default Constructor
/// </summary>
public Pad()
{
this.Members = new ObservableCollection<PadInfo>();
}
/// <summary>
/// Name of the pad
/// </summary>
public string Name { get; set; }
/// <summary>
/// Members of the pad
/// </summary>
public ObservableCollection<PadInfo> Members { get; set; }
}
/// <summary>
/// Class to hold the well and slot IDs snapped to a pad
/// </summary>
public class PadInfo
{
/// <summary>
/// Slot ID
/// </summary>
public string SlotID { get; set; }
/// <summary>
/// Well ID
/// </summary>
public string WellID { get; set; }
}
public class RelayCommand1 : ICommand
{
#region Fields
readonly Action<object> _execute;
readonly Predicate<object> _canExecute;
#endregion // Fields
#region Constructors
public RelayCommand1(Action<object> execute)
: this(execute, null)
{
}
public RelayCommand1(Action<object> execute, Predicate<object> canExecute)
{
if (execute == null)
throw new ArgumentNullException("execute");
_execute = execute;
_canExecute = canExecute;
}
#endregion // Constructors
#region ICommand Members
// [DebuggerStepThrough]
public bool CanExecute(object parameter)
{
return _canExecute == null ? true : _canExecute(parameter);
}
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public void Execute(object parameter)
{
_execute(parameter);
}
#endregion // ICommand Members
}
}
How can I identify the issue?
You have two problems:
IsSelected:
<Setter Property="IsSelected" Value="{Binding WellPadViewModel.IsSelected}" />
In TreeViewItem DataContext is set to instance of Pad and Pad doesn't have property IsSelected You have to do sth like this:
<Setter Property="IsSelected" Value="{Binding DataContext.IsSelected, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}" />
Problem with ContextMenu is much more sirious. ContextMenu isn't in VisualTree so you cannot bind to RelativeSource. Solution is here WPF Relative source- Cannot find source for binding with reference
Best regards
Please set the Tag property in your DataTemplate to TreeViewItem. I have sth like this:
<DataTemplate>
<Grid Width="270" Height="20" Tag="{Binding DataContext, RelativeSource = {RelativeSource AncestorType={x:Type UserControl}}}">
...
<Grid.ContextMenu>
<ContextMenu DataContext="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}">
<MenuItem Header="Edit">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<command:EventToCommand Command="{Binding Tag.YOURCOMMAND}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</MenuItem>
</ContextMenu>
</Grid.ContextMenu>
</Grid>
</DataTemplate>
It should work.
I want to implement (file) Explorer like icon display. The items have date and label.
User should be able to edit the label:
Select an item
Click on label
Label's TextBlock is replaced with TextBox for editing
How to end editing (just for info):
Click anywhere outside of the TextBox
Press Enter keyboard key (by implementing ICommand?)
1st I tried to set the Visibility of TextBlock and TextBox in code found out it is not the 'right' way to to do. Maybe it is possible to edit item's Label using (Data)Triggers?
I can track the OnClickLabelBlock and set selectedMedia.IsEditing = true; but it does not fire the trigger.
Any idea why MediaItem.IsEditing property value change is notifying the DataTrigger? Is it something to do with the order of execution or priority mechanism?
I will pick the answer which guides me to the 'best' architecture to solve it.
Thanks.
XAML:
<Window x:Class="WPFComponents.DailyImages"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Model="clr-namespace:WPFComponents.Model"
Title="Media Items" Height="300" Width="300">
<ListView x:Name="_mediaItemList" ItemsSource="{Binding MediaItems}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled" SelectionMode="Multiple">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="IsSelected" Value="{Binding IsSelected}" />
</Style>
</ListView.ItemContainerStyle>
<ListView.ItemTemplate>
<DataTemplate DataType="Model:MediaItem">
<Grid Width="80" Margin="4">
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Image HorizontalAlignment="Center" Stretch="Uniform" Source="{Binding Path=IconPath}" Width="70" />
<StackPanel Grid.Row="2">
<TextBlock Text="{Binding Path=Date}" TextWrapping="Wrap" />
<TextBlock x:Name="_labelTextBlock" Text="{Binding Path=Label}" TextWrapping="Wrap"
PreviewMouseLeftButtonDown="OnClickLabelBlock">
</TextBlock>
<TextBox x:Name="_labelTextBox" Text="{Binding Path=Label}" Visibility="Collapsed"
TextWrapping="WrapWithOverflow" TextAlignment="Center">
</TextBox>
</StackPanel>
</Grid>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsEditing}" Value="True">
<Setter TargetName="_labelTextBlock" Property="Visibility" Value="Collapsed" />
<Setter TargetName="_labelTextBox" Property="Visibility" Value="Visible" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" VerticalAlignment="Top" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
Source:
public partial class DailyImages
{
public DailyImages()
{
InitializeComponent();
ViewModel.DailyImages dailyImages = new ViewModel.DailyImages();
// DailyImages has ObservableCollection<MediaItem> MediaItems property
_mediaItemList.DataContext = dailyImages;
}
private void OnClickLabelBlock(object sender, MouseButtonEventArgs e)
{
TextBlock notes = sender as TextBlock;
if (notes == null)
return;
MediaItem selectedMedia = notes.DataContext as MediaItem;
if (selectedMedia == null)
{
// TODO: Throw exception
return;
}
_mediaItemList.SelectedItems.Clear();
selectedMedia.IsSelected = true;
selectedMedia.IsEditing = true;
}
public class MediaItem
{
public MediaItem()
{
IsEditing = false;
IsSelected = false;
}
public DateTime Date { get; set; }
public string Label { get; set; }
public string IconPath { get; set; }
public bool IsEditing { get; set; }
public bool IsSelected { get; set; }
}
References:
Dependency Property Value Precedence
Part II: ListView & File Explorer Like Behaviour
MediaItem must implement INotifyPropertyChanged and each of its properties that must be bound, must call RaisePropertyChanged in order for the binding to work correctly. In your case, the Binding on IsEditing has no way to know that the value has changed.
To bind your IsEditing property, WPF has to be notified when it is modified.
Then you have to implement INotifyPropertyChanged in MediaItem. (Or add dependency properties)
public class MediaItem : INotifyPropertyChanged
{
public MediaItem()
{
IsEditing = false;
IsSelected = false;
}
// Use the same pattern for Date, Label & IconPath if these value may change after the MediaItem instance has been added to the collection MediaItems.
public DateTime Date { get; set; }
public string Label { get; set; }
public string IconPath { get; set; }
private bool isSelected;
public bool IsSelected
{
get { return isSelected; }
set
{
if (isSelected != value)
{
isSelected = value;
OnPropertyChanged("IsSelected");
}
}
}
private bool isEditing;
public bool IsEditing
{
get { return isEditing; }
set
{
if (isEditing != value)
{
isEditing = value;
OnPropertyChanged("IsEditing");
}
}
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
}
Otherwise, your code is correct.
It seems like I read another question / answer on this site about this issue but I cannot recall what the answer was and now I cannot find the original post.
I am not a fan of the default error template in WPF. I understand how to change this error template. However, if I add some content to the end of, say, a textbox, the size of the textbox does not change and the added content will (potentially) get clipped. How do I alter the textbox (I believe the correct termonology is adorned element) in this scenario so that nothing gets clipped?
Here is the XAML for the error template:
<Style TargetType="{x:Type TextBox}">
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<StackPanel>
<AdornedElementPlaceholder />
<TextBlock Foreground="Red" Text="Error..." />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Here is the XAML for a couple of textboxes in the form:
<StackPanel>
<TextBox Text="{Binding...}" />
<TextBox />
</StackPanel>
Here's a solution adapted from Josh Smith's article on Binding to (Validation.Errors)[0] without Creating Debug Spew.
The trick is to define a DataTemplate to render the ValidationError object and then use a ContentPresenterto display the error message. If there is no error, then the ContentPresenter will not be displayed.
Below, I have shared the code of the sample app that I created.
Here is the XAML:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
SizeToContent="WidthAndHeight"
Title="MainWindow">
<StackPanel Margin="5">
<StackPanel.Resources>
<DataTemplate DataType="{x:Type ValidationError}">
<TextBlock Text="{Binding ErrorContent}" Foreground="White" Background="Red" VerticalAlignment="Center" FontWeight="Bold"/>
</DataTemplate>
</StackPanel.Resources>
<TextBox Name="TextBox1" Text="{Binding Text1, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}"/>
<ContentPresenter Content="{Binding ElementName= TextBox1, Path=(Validation.Errors).CurrentItem}" HorizontalAlignment="Left"/>
<TextBox Name="TextBox2" Text="{Binding Text2, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}"/>
<ContentPresenter Content="{Binding ElementName= TextBox2, Path=(Validation.Errors).CurrentItem}" HorizontalAlignment="Left"/>
<Button Content="Validate" Click="Button_Click"/>
</StackPanel>
</Window>
The code behind file:
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private ViewModel _ViewModel = null;
public MainWindow()
{
InitializeComponent();
_ViewModel = new ViewModel();
DataContext = _ViewModel;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
_ViewModel.Validate = true;
_ViewModel.OnPropertyChanged("Text1");
_ViewModel.OnPropertyChanged("Text2");
}
}
}
The ViewModel:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
namespace WpfApplication1
{
public class ViewModel : INotifyPropertyChanged, IDataErrorInfo
{
private string _Text1;
public string Text1
{
get { return _Text1; }
set
{
_Text1 = value;
OnPropertyChanged("Text1");
}
}
private string _Text2;
public string Text2
{
get { return _Text2; }
set
{
_Text2 = value;
OnPropertyChanged("Text2");
}
}
public bool Validate { get; set; }
#region INotifyPropertyChanged Implemenation
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
#region IDataErrorInfo Implementation
public string Error
{
get { return null; }
}
public string this[string columnName]
{
get
{
string errorMessage = string.Empty;
if (Validate)
{
switch (columnName)
{
case "Text1":
if (Text1 == null)
errorMessage = "Text1 is mandatory.";
else if (Text1.Trim() == string.Empty)
errorMessage = "Text1 is not valid.";
break;
case "Text2":
if (Text2 == null)
errorMessage = "Text2 is mandatory.";
else if (Text2.Trim() == string.Empty)
errorMessage = "Text2 is not valid.";
break;
}
}
return errorMessage;
}
}
#endregion
}
}
I am going insane trying to get this to work with even the most basic example. I cannot for the life of me get binding to work. Here is a super easy example that is not working for me. I MUST be doing something incorrect.
My Custom Control in my control library assembly:
public class TestControl : Control
{
public static readonly DependencyProperty TestPropProperty =
DependencyProperty.Register("TestProp", typeof(string), typeof(TestControl), new UIPropertyMetadata(null));
public string TestProp
{
get { return (string)GetValue(TestPropProperty); }
set { SetValue(TestPropProperty, value); }
}
static TestControl()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TestControl), new FrameworkPropertyMetadata(typeof(TestControl)));
}
}
And its XAML template:
<Style TargetType="{x:Type local:TestControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:TestControl}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<StackPanel>
<TextBlock Text="Testing..." />
<Label Content="{Binding TestProp}" Padding="10" />
</StackPanel>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Here's the XAML consuming the control in a wpf window with a reference to my control library:
<Grid>
<ItemsControl Name="mylist">
<ItemsControl.ItemTemplate>
<DataTemplate>
<my:TestControl TestProp="{Binding Path=Name}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
And here's the code behind:
public partial class Test2 : Window
{
public class TestObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string PropertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
}
private int _id;
public int id
{
get { return _id; }
set { _id = value; OnPropertyChanged("id"); }
}
private string _Name;
public string Name
{
get { return _Name; }
set { _Name = value; OnPropertyChanged("Name"); }
}
}
public Test2()
{
InitializeComponent();
mylist.ItemsSource = new TestObject[]
{
new TestObject(){ id = 1, Name = "Tedd" },
new TestObject(){ id = 2, Name = "Fred" },
new TestObject(){ id = 3, Name = "Jim" },
new TestObject(){ id = 4, Name = "Jack" },
};
}
}
Running this example gives me four instances of the control, however I only see the "Testing..." TextBlock on each. My label is never bound. What am I misunderstanding and doing incorrectly?
You haven't set the proper binding source. You would either have to set RelativeSource:
<Label Content="{Binding TestProp, RelativeSource={RelativeSource Mode=TemplatedParent}}" />
Or use TemplateBinding:
<Label Content="{TemplateBinding TestProp}"/>
On my datagrid I've got a DataTrigger determining which colour to set the foreground (Text) to be. This value is being stored as a property of my page.
I've got this all working nicely but now I'm giving the user the functionality to set this colour themselves.
My problem is when this colour is set by the user and I update the property how do I make the datagrid now reflect this change.
Example of what I am doing below (PrivateMessages being show in different colour)
<DataTrigger Binding="{Binding Path=IsPrivate}" Value="True">
<Setter Property="Foreground" Value="{Binding ElementName=GridPage, Path=PrivateMessageColour}" />
</DataTrigger>
Any help or guidance would be most appreciated.
Thanks in advance.
Make sure your type implements the INotifyPropertyChanged interface and you fire the change notification on the setter of your publicly exposed property which the DataTrigger is bound to when you modify the color.
EDIT: Below is an example using a TextBox and a Button to change the color...
C#:
public partial class Window1 : Window
{
MyData _data = new MyData();
public Window1()
{
InitializeComponent();
this.DataContext = _data;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
_data.ChangeColor();
}
}
public class MyData : INotifyPropertyChanged
{
Random _rand = new Random();
List<String> _colors = new List<string> { "Red", "Black", "Blue" };
public void ChangeColor()
{
MyColor = _colors[_rand.Next(0, 3)];
}
private bool _isActive = true;
public bool IsActive
{
get
{
return _isActive;
}
set
{
_isActive = value;
PropertyChangedEventHandler h = PropertyChanged;
if (h != null)
h(this, new PropertyChangedEventArgs("IsActive"));
}
}
private String _myColor = "Green";
public String MyColor
{
get
{
return _myColor;
}
set
{
_myColor = value;
PropertyChangedEventHandler h = PropertyChanged;
if (h != null)
h(this, new PropertyChangedEventArgs("MyColor"));
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
}
XAML:
<Grid>
<Button Height="25" Click="Button_Click" Content="Change Color" VerticalAlignment="Bottom" />
<TextBox Width="200" Height="100">
<TextBox.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding IsActive}" Value="true">
<Setter Property="TextBox.Background" Value="{Binding MyColor}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
</Grid>