我有一个 xaml 代码，如下所示： 在 MouseLeftButtonDown 上，我将其重定向到颜色 GenerateGlowEffect 必须更改的 viewModel。这没有反映。对于 this.PropertyChanged XAML，它始终返回 null：
<UserControl
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:ed="http://schemas.microsoft.com/expression/2010/drawing"
xmlns:telerikDocking="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Docking"
xmlns:Telerik_Windows_Controls="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
xmlns:System="clr-namespace:System;assembly=mscorlib" x:Class="TabItemContents.MapDetail"
mc:Ignorable="d" Width="Auto" Height="430.333">
<Grid x:Name="LayoutRoot" Background="{StaticResource TabControlActiveAreaColor}" Height="430.333" VerticalAlignment="Top" HorizontalAlignment="Left">
<Grid.RowDefinitions>
<RowDefinition Height="192.833"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Rectangle IsHitTestVisible="True" x:Name="Rectangle_Generate" Margin="25.334,70.167,0,65.333" Cursor="{DynamicResource HandCursor}" RadiusX="10" RadiusY="10" HorizontalAlignment="Left" Width="88.5" StrokeThickness="1.5" d:LayoutOverrides="HorizontalAlignment" MouseLeftButtonDown="Rectangle_Generate_MouseLeftButtonDown" >
<Rectangle.Fill>
<SolidColorBrush Color="{DynamicResource RectangleColor}"/>
</Rectangle.Fill>
<Rectangle.Effect >
<DropShadowEffect RenderingBias="Quality" BlurRadius="{DynamicResource BlurRadius}" ShadowDepth="0" Color="{Binding GenerateGlowEffect}" />
</Rectangle.Effect>
</Rectangle>
</Grid>
代码隐藏：
public partial class MapDetail : UserControl
{
ViewModel ViewModelObject;
public MapDetail()
{
InitializeComponent();
ViewModelObject= new ViewModelObject((IUnityContainer)Application.Current.Properties["UnityContainer"]);
}
private void Rectangle_Generate_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
ViewModelObject.SetColor();
}
}
视图模型：
public class ViewModel : ViewModelBase
{
private IUnityContainer _unityContainer;
private ILogger _logger;
private Model model;
private string _generateGlowEffect;
public ViewModel(IUnityContainer unityContainer)
{
_unityContainer = unityContainer;
try
{
model = new Model(unityContainer);
}
catch (Exception ex)
{
throw ex;
}
}
public void SetColor()
{
GenerateGlowEffect = "White";
}
public string GenerateGlowEffect
{
get { return _generateGlowEffect; }
set {
_generateGlowEffect = value;
OnPropertyChanged("GenerateGlowEffect");
}
}
}
}
public string GenerateGlowEffect
{
get { return _generateGlowEffect; }
set {
_generateGlowEffect = value;
OnPropertyChanged("GenerateGlowEffect");
}
}
视图模型库：
public class ViewModelBase : INotifyPropertyChanged, IDisposable
{
#region Constructor
protected ViewModelBase()
{
}
#endregion // Constructor
#region DisplayName
/// <summary>
/// Returns the user-friendly name of this object.
/// Child classes can set this property to a new value,
/// or override it to determine the value on-demand.
/// </summary>
public virtual string DisplayName { get; protected set; }
#endregion // DisplayName
#region Debugging Aides
/// <summary>
/// Warns the developer if this object does not have
/// a public property with the specified name. This
/// method does not exist in a Release build.
/// </summary>
[Conditional("DEBUG")]
[DebuggerStepThrough]
public void VerifyPropertyName(string propertyName)
{
// Verify that the property name matches a real,
// public, instance property on this object.
if (TypeDescriptor.GetProperties(this)[propertyName] == null)
{
string msg = "Invalid property name: " + propertyName;
if (this.ThrowOnInvalidPropertyName)
throw new Exception(msg);
else
Debug.Fail(msg);
}
}
/// <summary>
/// Returns whether an exception is thrown, or if a Debug.Fail() is used
/// when an invalid property name is passed to the VerifyPropertyName method.
/// The default value is false, but subclasses used by unit tests might
/// override this property's getter to return true.
/// </summary>
protected virtual bool ThrowOnInvalidPropertyName { get; private set; }
#endregion // Debugging Aides
#region INotifyPropertyChanged Members
/// <summary>
/// Raised when a property on this object has a new value.
/// </summary>
public event PropertyChangedEventHandler PropertyChanged;
/// <summary>
/// Raises this object's PropertyChanged event.
/// </summary>
/// <param name="propertyName">The property that has a new value.</param>
protected virtual void OnPropertyChanged(string propertyName)
{
this.VerifyPropertyName(propertyName);
PropertyChangedEventHandler handler = this.PropertyChanged;
if (handler != null)
{
var e = new PropertyChangedEventArgs(propertyName);
handler(this, e);
}
}
#endregion // INotifyPropertyChanged Members
#region IDisposable Members
/// <summary>
/// Invoked when this object is being removed from the application
/// and will be subject to garbage collection.
/// </summary>
public void Dispose()
{
this.OnDispose();
}
/// <summary>
/// Child classes can override this method to perform
/// clean-up logic, such as removing event handlers.
/// </summary>
protected virtual void OnDispose()
{
}
#endregion // IDisposable Members
}
}