C# 如何从静态资源中添加样式设置器作为附加行为
我使用附加的依赖属性创建了一个行为,将一个公共的C# 如何从静态资源中添加样式设置器作为附加行为,c#,wpf,visual-studio-2013,attached-properties,C#,Wpf,Visual Studio 2013,Attached Properties,我使用附加的依赖属性创建了一个行为,将一个公共的SetterBaseCollection提供给不同的相关样式 该行为只是管理附加的主机属性上的集合,以便将其与视图中的静态资源对齐。我刚刚将其连接到AP PropertyChangedCallback,这对于我拥有的另一种行为很好,即填充CommandBindings,但在将其应用于样式设置器时抛出 错误是 System.Windows.Markup.XamlParseException occurred _HResult=-214623308
SetterBaseCollection
提供给不同的相关样式
该行为只是管理附加的主机属性上的集合,以便将其与视图中的静态资源对齐。我刚刚将其连接到AP PropertyChangedCallback,这对于我拥有的另一种行为很好,即填充CommandBindings,但在将其应用于样式设置器时抛出
错误是
System.Windows.Markup.XamlParseException occurred
_HResult=-2146233087
_message='Set property 'System.Windows.EventSetter.Event' threw an exception.' Line number '12' and line position '26'.
HResult=-2146233087
IsTransient=false
Message='Set property 'System.Windows.EventSetter.Event' threw an exception.' Line number '12' and line position '26'.
Source=PresentationFramework
LineNumber=12
LinePosition=26
StackTrace:
at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
InnerException: System.ArgumentNullException
_HResult=-2147467261
_message=Value cannot be null.
HResult=-2147467261
IsTransient=false
Message=Value cannot be null.
Parameter name: value
Source=PresentationFramework
ParamName=value
StackTrace:
at System.Windows.EventSetter.set_Event(RoutedEvent value)
InnerException:
在错误发生之前不会调用行为代码,因此它是xaml中的一部分
景色
行为课
公共静态只读DependencyProperty StyleSettersProperty=
DependencyProperty.RegisterAttached(
“样式设置器”,字体(SetterBaseCollection),
类型(行为),
新属性元数据(默认值(SetterBaseCollection),
(t,a)=>UpdateCollection
(框架元素)t.风格,a,“Setters”);
公共静态void SetStyleSetters(DependencyObject元素,
SetterBaseCollection值)
{
SetValue(StyleSettersProperty,value);
}
公共静态SetterBaseCollection GetStyleSetters(
DependencyObject元素)
{
返回(SetterBaseCollection)元素
.GetValue(StyleSettersProperty);
}
#端区
私有静态void UpdateCollection(
对象目标,DependencyPropertyChangedEventArgs参数,
字符串targetCollection)
其中t集合:类,IList
托斯特:在哪里上课
{
var host=目标为THost;
if(host==null)返回;
var collection=typeof(THost).GetProperty(targetCollection)
.GetValue(主机)作为IList;
if(collection==null)返回;
var oldValue=args.oldValue作为TCollection;
if(oldValue!=null)
{
foreach(oldValue中的var成员)
{
集合。移除(成员);
}
}
尝试
{
var newValue=args.newValue作为TCollection;
if(newValue!=null)
{
foreach(newValue中的var成员)
{
集合。添加(成员);
}
}
}
捕获(例外e)
{
WriteLine(“{0}在UpdateCollection中”);
}
}
StaticResource的值始终为空。每次在按钮上设置属性并将按钮作为第一个参数传递时,都会点击OnPropertyChanged回调。样式不是DependencyObject,因此无法在样式上设置样式设置器附加属性。样式不是DependencyObject,因此无法在样式上设置样式设置器附加属性一种风格。@mm8啊,当然可以。谢谢,还有别的办法吗?我尝试了一种不同的方法来避免这个问题,但仍然无法让它工作。你有什么看法吗?我想没有。不能将触发器的Setters属性直接设置为在XAML中定义为资源的SetterBaseCollection对象,因为该属性是只读的:它是只读的,但其成员不是。我应该能够像我在代码中一样添加到集合中,不是吗?你不能将setters添加到按钮的样式中,因为它是密封的。啊,好的。是的,我在源代码中看到:
IsSealed
。我想我已经击中了我的WPF WTF密封(原文如此)。我不再打扰你了,读一读我的博客。干杯
<Window.Resources>
<Thickness x:Key="ButtonMargin">6</Thickness>
<SetterBaseCollection x:Key="ButtonStyleSetters">
<EventSetter Event="ButtonBase.Click" Handler="StyleClick" />
<Setter Property="FrameworkElement.Height" Value="30" />
<Setter Property="FrameworkElement.Margin" Value="6" />
</SetterBaseCollection>
<Style TargetType="{x:Type Button}"
b:Behaviours.StyleSetters="{StaticResource ButtonStyleSetters}" />
<Style TargetType="{x:Type ToggleButton}"
b:Behaviours.StyleSetters="{StaticResource ButtonStyleSetters}" />
<Style TargetType="{x:Type CheckBox}">
<EventSetter Event="Click" Handler="StyleClick" />
</Style>
<Style TargetType="{x:Type b:MultiCommandButton}"
b:Behaviours.StyleSetters="{StaticResource ButtonStyleSetters}" />
<Style TargetType="UniformGrid">
<Setter Property="Columns" Value="2" />
</Style>
<CommandBindingCollection x:Key="OutputToggleReceiveAll">
<b:OutputToggleBind />
<b:OutputToggleEnabledBind />
</CommandBindingCollection>
</Window.Resources>
public static class Behaviours
{
#region AP CommandReceivers
public static readonly DependencyProperty CommandReceiversProperty =
DependencyProperty.RegisterAttached(
"CommandReceivers", typeof(CommandBindingCollection),
typeof(Behaviours),
new PropertyMetadata(default(CommandBindingCollection),
(t, a) => UpdateCollection<CommandBindingCollection, UIElement>
(t, a, "CommandBindings")));
public static void SetCommandReceivers(DependencyObject element,
CommandBindingCollection value)
{
element.SetValue(CommandReceiversProperty, value);
}
public static CommandBindingCollection GetCommandReceivers(
DependencyObject element)
{
return (CommandBindingCollection) element
.GetValue(CommandReceiversProperty);
}
#endregion
#region AP StyleSetters
public static readonly DependencyProperty StyleSettersProperty =
DependencyProperty.RegisterAttached(
"StyleSetters", typeof(SetterBaseCollection),
typeof(Behaviours),
new PropertyMetadata(default(SetterBaseCollection),
(t, a) => UpdateCollection<SetterBaseCollection, UIElement>
(t, a, "Setters")));
public static void SetStyleSetters (DependencyObject element,
SetterBaseCollection value)
{
element.SetValue(StyleSettersProperty, value);
}
public static SetterBaseCollection GetStyleSetters (
DependencyObject element)
{
return (SetterBaseCollection)element
.GetValue(StyleSettersProperty);
}
#endregion
private static void UpdateCollection<TCollection, THost> (
DependencyObject target, DependencyPropertyChangedEventArgs args,
string targetCollection)
where TCollection : IList
where THost : class
{
var host = target as THost;
if (host == null) return;
var collection = typeof(THost).GetProperty(targetCollection)
.GetValue(host) as IList;
if (collection == null) return;
if (args.OldValue != null)
{
foreach (var member in
(TCollection) args.OldValue)
{
collection.Remove(member);
}
}
if (args.NewValue != null)
{
foreach (var member in
(TCollection) args.NewValue)
{
collection.Add(member);
}
}
}
}
<Window.Resources>
<SetterBaseCollection x:Key="ButtonStyleSetters">
<EventSetter Event="ButtonBase.Click" Handler="StyleClick" />
<Setter Property="FrameworkElement.Height" Value="30" />
<Setter Property="FrameworkElement.Margin" Value="6" />
</SetterBaseCollection>
<Style TargetType="{x:Type Button}" >
<Setter Property="local:Behaviours.StyleSetters"
Value="{StaticResource ButtonStyleSetters}"/>
</Style>
</Window.Resources>
public static readonly DependencyProperty StyleSettersProperty =
DependencyProperty.RegisterAttached(
"StyleSetters", typeof(SetterBaseCollection),
typeof(Behaviours),
new PropertyMetadata(default(SetterBaseCollection),
(t, a) => UpdateCollection<SetterBaseCollection, Style>
(((FrameworkElement)t).Style, a, "Setters")));
public static void SetStyleSetters (DependencyObject element,
SetterBaseCollection value)
{
element.SetValue(StyleSettersProperty, value);
}
public static SetterBaseCollection GetStyleSetters (
DependencyObject element)
{
return (SetterBaseCollection)element
.GetValue(StyleSettersProperty);
}
#endregion
private static void UpdateCollection<TCollection, THost> (
object target, DependencyPropertyChangedEventArgs args,
string targetCollection)
where TCollection : class, IList
where THost : class
{
var host = target as THost;
if (host == null) return;
var collection = typeof(THost).GetProperty(targetCollection)
.GetValue(host) as IList;
if (collection == null) return;
var oldValue = args.OldValue as TCollection;
if (oldValue != null)
{
foreach (var member in oldValue)
{
collection.Remove(member);
}
}
try
{
var newValue = args.NewValue as TCollection;
if (newValue != null)
{
foreach (var member in newValue)
{
collection.Add(member);
}
}
}
catch (Exception e)
{
Debug.WriteLine("{0} in UpdateCollection<TCollection, THost>");
}
}