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我一直試圖找出大量的谷歌搜索和SO，但不幸的是我無法解決這個問題。我讀得越多，我就越困惑。將傳統事件添加到自定義控件
我想建立一個自動完成文本框作爲自定義控件。
我CustomControl：
<UserControl x:Class="ApplicationStyling.Controls.AutoCompleteTextBox"
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:local="clr-namespace:ApplicationStyling.Controls"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="300"
Name="AutoCompleteBox">
<Grid>
<TextBox Grid.Row="3"
Style="{DynamicResource InputBox}"
x:Name="SearchBox"
Text="{Binding Text}"
TextChanged="{Binding ElementName=AutoCompleteBox, Path=TextChanged}"/>
<ListBox x:Name="SuggestionList"
Visibility="Collapsed"
ItemsSource="{Binding ElementName=AutoCompleteTextBox, Path=SuggestionsSource}"
SelectionChanged="{Binding ElementName=AutoCompleteBox, Path=SelectionChanged}">
<ListBox.ItemTemplate>
<DataTemplate>
<Label Content="{Binding Label}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</UserControl>
我的身後代碼：
using System.Collections;
using System.Windows;
using System.Windows.Controls;
namespace ApplicationStyling.Controls
{
/// <summary>
/// Interaction logic for AutoCompleteTextBox.xaml
/// </summary>
public partial class AutoCompleteTextBox : UserControl
{
public static readonly DependencyProperty SuggestionsSourceProperty;
public static readonly DependencyProperty TextProperty;
// Events
public static readonly RoutedEvent TextChangedProperty;
public static readonly RoutedEvent SelectionChangedProperty;
static AutoCompleteTextBox()
{
// Attributes
AutoCompleteTextBox.SuggestionsSourceProperty = DependencyProperty.Register("SuggestionsSource", typeof(IEnumerable), typeof(AutoCompleteTextBox));
AutoCompleteTextBox.TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(AutoCompleteTextBox));
// Events
AutoCompleteTextBox.TextChangedProperty = EventManager.RegisterRoutedEvent("TextChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(AutoCompleteTextBox));
AutoCompleteTextBox.SelectionChangedProperty = EventManager.RegisterRoutedEvent("SelectionChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(AutoCompleteTextBox));
}
#region Events
public event RoutedEventHandler TextChanged
{
add { AddHandler(TextChangedProperty, value); }
remove { RemoveHandler(TextChangedProperty, value); }
}
// This method raises the Tap event
void RaiseTextChangedEvent()
{
RoutedEventArgs newEventArgs = new RoutedEventArgs(AutoCompleteTextBox.TextChangedProperty);
RaiseEvent(newEventArgs);
}
public event RoutedEventHandler SelectionChanged
{
add { AddHandler(SelectionChangedProperty, value); }
remove { RemoveHandler(SelectionChangedProperty, value); }
}
// This method raises the Tap event
void RaiseSelectionChangedEvent()
{
RoutedEventArgs newEventArgs = new RoutedEventArgs(AutoCompleteTextBox.SelectionChangedProperty);
RaiseEvent(newEventArgs);
}
#endregion
#region DProperties
/// <summary>
/// IEnumerable ItemsSource Property for the Suggenstion Box
/// </summary>
public IEnumerable SuggestionsSource
{
get
{
return (IEnumerable)GetValue(AutoCompleteTextBox.SuggestionsSourceProperty);
}
set
{
SetValue(AutoCompleteTextBox.SuggestionsSourceProperty, value);
}
}
/// <summary>
/// This is the Text attribute which routes to the Textbox
/// </summary>
public string Text
{
get
{
return (string)GetValue(AutoCompleteTextBox.TextProperty);
}
set
{
SetValue(AutoCompleteTextBox.TextProperty, value);
}
}
#endregion
public AutoCompleteTextBox()
{
InitializeComponent();
SearchBox.TextChanged += (sender, args) => RaiseTextChangedEvent();
SuggestionList.SelectionChanged += (sender, args) => RaiseSelectionChangedEvent();
}
}
}
最後，我的方式使用它：
<asc:AutoCompleteTextBox x:Name="ShareAutoCompleteBox"
Grid.Row="3"
SelectionChanged="ShareAutoCompleteBox_SelectionChanged"
TextChanged="ShareAutoCompleteBox_TextChanged"/>
其中asc是外包類的命名空間通過app.xaml加載的庫。
不管怎麼說，我在TextBox.TextChanged屬性得到在XAML和運行代碼時的問題：
System.InvalidCastException：無法投型「System.Reflection.RuntimeEventInfo」的對象鍵入'System.Reflection.MethodInfo'。
那麼這裏究竟發生了什麼？我想將AutoCompleteTextBox TextChanged轉發到自定義控制模板中的TextBox。與SelectionChanged到Listbox一樣。
我把大部分代碼從https://msdn.microsoft.com/en-us/library/ms752288(v=vs.100).aspx（用於事件）和其他一些SO問題的自定義屬性的代碼。
不知道，問題是什麼，我期待着您的幫助。