将 属性 绑定到用户控件
Bind property to UserControl
我遇到了与此 Thread 相同的问题。
我也读过这个 article 但我找不到出现此异常的原因：
我正在调用一个 UserControl，其中应该调用另一个 UserControl。
在第一个 UserControl 中，我想执行以下操作
<UserControl
x:Class="TwitterUniversalHubTest1.UCGlobalTweet"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:TwitterUniversalHubTest1"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="150"
d:DesignWidth="400">
<Grid Height="Auto">
<Border Background="#FFFFFFFF" Margin="10 0 0 5" CornerRadius="2 2 15 2">
<Grid Width="380">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Tag="{Binding UserID}" Grid.Row="0" Name="ProfileInfo" Tapped="Profile_Tapped" Orientation="Horizontal" Margin="15 15 15 0">
<Grid Width="360" Margin="0 0 0 10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="75"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="50"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" Height="45" Width="45" CornerRadius="5">
<Border.Background>
<ImageBrush ImageSource="{Binding ImagePath}" Stretch="UniformToFill"/>
</Border.Background>
</Border>
<StackPanel Grid.Column="1" Orientation="Vertical" Margin="0 5 0 0">
<TextBlock Text="{Binding FullName}" Foreground="Black" FontSize="18" FontWeight="Bold"></TextBlock>
<TextBlock Text="{Binding TwitterHandle}" Foreground="DarkGray" FontSize="12"/>
</StackPanel>
<Image Grid.Column="2" Source="Assets/ActionIcons/Twitter_logo_blue_32.png" Width="32" VerticalAlignment="Top"></Image>
</Grid>
</StackPanel>
<StackPanel Grid.Row="1" Margin="14.5,0,0,0" Height="Auto">
<StackPanel Name="TwContent" Tag="{Binding TweetID}" Margin="15 0 15 0" Tapped="Content_Tapped">
<local:ComplexTextPresenter x:Name="ComplexTextPresenterElement" Input="{Binding Content}" DataContext="{Binding Content}"/>
<ItemsControl ItemsSource="{Binding ContentImages}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Image Source="{Binding }" MaxWidth="350" Margin="0 0 0 5" HorizontalAlignment="Center"></Image>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<TextBlock Foreground="DarkGray" Text="{Binding DateSend}" FontSize="10"></TextBlock>
</StackPanel>
<StackPanel Name="ActionButtons">
<Grid Tag="{Binding TweetID}" Width="380" Height="25" Margin="0 0 0 10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Grid.Column="0" HorizontalAlignment="Center" Margin="20 0 0 0" Style="{StaticResource replyActionButton}" Tapped="Reply_Tapped"></Button>
<ToggleButton Grid.Column="2" HorizontalAlignment="Center" Style="{StaticResource retweetActionButton}" Tapped="Retweet_Tapped"></ToggleButton>
<TextBlock Grid.Column="3" HorizontalAlignment="Left" Margin="-15 0 0 0" VerticalAlignment="Center" Text="{Binding RetweetCount}" Foreground="DarkGray"/>
<ToggleButton x:Name="FavButton" Grid.Column="4" HorizontalAlignment="Center"
Style="{StaticResource likeActionButton}"
IsChecked="{Binding LikeState}"
Tapped="Favourite_Tapped"/>
<TextBlock Grid.Column="5" HorizontalAlignment="Left" Margin="-15 0 0 0" VerticalAlignment="Center" Text="{Binding LikeCount}" Foreground="DarkGray"/>
</Grid>
</StackPanel>
</StackPanel>
</Grid>
</Border>
</Grid>
Input="{Binding Content}"中的内容属性是一个字符串。
输入 属性 绑定出现问题。 ItemsControl 中的绑定工作正常。如异常所述，绑定位于 Line:43 位置：90.
ComplexTextPresenterElement 的代码隐藏如下所示：
public static readonly DependencyProperty InputProperty = DependencyProperty.Register("Input", typeof(string), typeof(UCGlobalTweet), new PropertyMetadata(default(string), InputPropertyChangedCallback));
private static void InputPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var ctrl = dependencyObject as ComplexTextPresenter;
if (ctrl == null)
return;
ctrl.Init();
}
public static readonly DependencyProperty InputCollectionProperty = DependencyProperty.Register("InputCollection", typeof(ObservableCollection<object>), typeof(UCGlobalTweet), new PropertyMetadata(default(ObservableCollection<object>)));
public static readonly DependencyProperty OnHyperlinkCommandProperty = DependencyProperty.Register("OnHyperlinkCommand", typeof(ICommand), typeof(UCGlobalTweet), new PropertyMetadata(default(ICommand)));
private IEnumerable<object> GetParsedInput()
{
List<BaseInputPart> inputParts = new List<BaseInputPart>();
var strings = Input.Split(new[] { " " }, StringSplitOptions.None).ToList();
foreach (var s in strings)
{
if (s.IsHyperlink())
{
inputParts.Add(new HyperLinkPart { Content = s });
}
else
{
inputParts.Add(new LiteralPart { Content = s });
}
}
return inputParts.OfType<object>().ToList();
}
public string Input
{
get { return (string)GetValue(InputProperty); }
set { SetValue(InputProperty, value); }
}
public ObservableCollection<object> InputCollection
{
get { return (ObservableCollection<object>)GetValue(InputCollectionProperty); }
private set { SetValue(InputCollectionProperty, value); }
}
public ICommand OnHyperlinkCommand
{
get { return (ICommand)GetValue(OnHyperlinkCommandProperty); }
set { SetValue(OnHyperlinkCommandProperty, value); }
}
private void Init()
{
InputCollection = new ObservableCollection<object>(GetParsedInput());
}
public ComplexTextPresenter()
{
this.InitializeComponent();
}
public abstract class BaseInputPart
{
public abstract string Content { get; set; }
}
public class HyperLinkPart : BaseInputPart
{
public override string Content { get; set; }
}
public class LiteralPart : BaseInputPart
{
public override string Content { get; set; }
}
//更新：这是 UCGlobalTweet.xaml.cs
public sealed partial class UCGlobalTweet : UserControl
{
private readonly NavigationHelper navigationHelper;
private readonly ObservableDictionary defaultViewModel = new ObservableDictionary();
private readonly ResourceLoader resourceLoader = ResourceLoader.GetForCurrentView("Resources");
//passingparameter
public string MyContentProperty { get; set; }
public UCGlobalTweet()
{
this.InitializeComponent();
Init();
}
private void Init()
{
ComplexTextPresenterElement.Input = "This is where the Content string has to be....";
ComplexTextPresenterElement.OnHyperlinkCommand = new RelayCommand<object>(Execute);
}
private void Execute(object o)
{
//put here the code that can open browser
}
public ObservableDictionary DefaultViewModel
{
get { return this.defaultViewModel; }
}
// Tap user specific content
private void Profile_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("I've clicked on information from Profile --> UserInfoPage");
List<object> passingParameters = new List<object>();
StackPanel st = (StackPanel)sender;
string userIDList = (string)st.Tag;
//provisional Data transfer
// get UserObject out of SearchResult, therefore I have to put the user content as a global variable to access it here, but this will require a lot of space probably...
// So for now I recall the UserObject again.
var usersResponse =
(from user in TweetContent.Connection.User
where user.Type == UserType.Lookup &&
user.UserIdList == userIDList
//user.ScreenNameList == "JoeMayo,Linq2Tweeter"
select user).ToList();
User curUser = usersResponse.FirstOrDefault();
passingParameters.Add(curUser);
(Window.Current.Content as Frame).Navigate(typeof(UserInfoPage), passingParameters);
}
// Tap tweet specific content
private void Content_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("I've clicked the Tweet content --> Going to TweetInfoPage");
List<object> passingParameters = new List<object>();
StackPanel ContentTapped = (StackPanel)sender;
ulong tag = (ulong)ContentTapped.Tag;
var test = TweetContent.FulltweetList;
var tweet = test.FirstOrDefault(tw => tw.TweetID == tag);
passingParameters.Add(tweet);
(Window.Current.Content as Frame).Navigate(typeof(TweetInfoPage), passingParameters);
}
//Action Buttons
private void Reply_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("Reply Button Tapped");
var test = (Button)sender;
e.Handled = true;
Debug.WriteLine("New State for Reply: " + test.IsPressed);
}
private void Retweet_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("Retweet Button Tapped");
//var test = (Button)sender;
//e.Handled = true;
//Debug.WriteLine("New State for Retweet: " + test.IsPressed);
}
private async void Favourite_Tapped(object sender, TappedRoutedEventArgs e)
{
try
{
Debug.WriteLine("Favourite Button Tapped");
ToggleButton tBtn = (ToggleButton)sender;
Grid pGrid = (Grid)tBtn.Parent;
var curTweet = TweetContent.FulltweetList.Where(tw => tw.TweetID.Equals(pGrid.Tag));
if (tBtn.IsChecked == false)
{
Debug.WriteLine("Status should be Checked: " + tBtn.IsChecked);
await TweetContent.Connection.DestroyFavoriteAsync((ulong)pGrid.Tag);
curTweet.First().LikeCount--;
}
if (tBtn.IsChecked == true)
{
Debug.WriteLine("Status should be UnChecked: " + tBtn.IsChecked);
await TweetContent.Connection.CreateFavoriteAsync((ulong)pGrid.Tag);
curTweet.First().LikeCount++;
}
}
catch (Exception ex)
{
Debug.WriteLine("Error while updating Favourite State: Message: " + ex);
}
finally
{
e.Handled = true;
}
}
private void RealLink_Clicked(object sender, RoutedEventArgs e)
{
var hyperlink = sender as Hyperlink;
if (hyperlink == null) return;
//Process.Start(hyperlink.NavigateUri.AbsoluteUri);
}
}
下面是 ComplexTextPresenter.xaml - 我所说的第二个 UserControl
<UserControl
x:Class="TwitterUniversalHubTest1.ComplexTextPresenter"
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"
xmlns:ts="using:TwitterUniversalHubTest1"
xmlns:panel="using:Gregstoll"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400" x:Name="This">
<Grid>
<Grid.Resources>
<DataTemplate x:Key="HyperlinkDataTemplateKey">
<HyperlinkButton Padding="0" Margin="0" FontSize="12" CommandParameter="{Binding }" Command="{Binding ElementName=This, Path=OnHyperlinkCommand}" Content="{Binding Path=Content}" Foreground="Blue"/>
</DataTemplate>
<DataTemplate x:Key="LiteralDataTemplateKey">
<TextBlock Padding="0" Margin="0" FontSize="12" Text="{Binding Path=Content}"></TextBlock>
</DataTemplate>
<ts:MyDataTemplateSelector x:Key="DataTemplateSelectorKey"
LiteralDataTemplate ="{StaticResource LiteralDataTemplateKey}"
HyperlinkDataTemplate="{StaticResource HyperlinkDataTemplateKey}"/>
<Style TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<ContentPresenter HorizontalAlignment="Left" VerticalAlignment="Center" Margin="5,0,0,0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<!--<Rectangle Fill="Green" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>-->
<ListBox Margin="-5 0 0 15" Foreground="Black" ItemsSource="{Binding ElementName=This, Path=InputCollection}" ItemTemplateSelector="{StaticResource DataTemplateSelectorKey}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<panel:UniversalWrapPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ListBox>
</Grid>
干杯，
乌尔平
您的绑定中没有 DataContext、ElementName 或 Source。有几种方法可以使代码工作，我会给你最简单的方法，你可以选择其中的任何一种。
1) 将 UserControl 的 DataContext 设置为 {Binding RelativeSource={RelativeSource Self}}。不过，这是一种糟糕的方法，因为您可能会覆盖现有的 DataContext 或从外部代码中覆盖它。
2) 命名您的 UserControl 并使用 ElementName.
绑定到它
Input="{Binding Content, ElementName=userControl}"
3) 使用{x:Bind}:
Input="{x:Bind Content}"
当您注册您的属性时，您应该传递包含属性的 class 的类型，但您传递的是 typeof(UCGlobalTweet)。你应该这样做：
class ComplexTextPresenterElement
{
public static readonly DependencyProperty InputProperty = DependencyProperty.Register("Input", typeof(string), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(string), InputPropertyChangedCallback));
public static readonly DependencyProperty InputCollectionProperty = DependencyProperty.Register("InputCollection", typeof(ObservableCollection<object>), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(ObservableCollection<object>)));
public static readonly DependencyProperty OnHyperlinkCommandProperty = DependencyProperty.Register("OnHyperlinkCommand", typeof(ICommand), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(ICommand)));
}
我遇到了与此 Thread 相同的问题。
我也读过这个 article 但我找不到出现此异常的原因：
我正在调用一个 UserControl，其中应该调用另一个 UserControl。
在第一个 UserControl 中，我想执行以下操作
<UserControl
x:Class="TwitterUniversalHubTest1.UCGlobalTweet"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:TwitterUniversalHubTest1"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="150"
d:DesignWidth="400">
<Grid Height="Auto">
<Border Background="#FFFFFFFF" Margin="10 0 0 5" CornerRadius="2 2 15 2">
<Grid Width="380">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Tag="{Binding UserID}" Grid.Row="0" Name="ProfileInfo" Tapped="Profile_Tapped" Orientation="Horizontal" Margin="15 15 15 0">
<Grid Width="360" Margin="0 0 0 10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="75"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="50"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" Height="45" Width="45" CornerRadius="5">
<Border.Background>
<ImageBrush ImageSource="{Binding ImagePath}" Stretch="UniformToFill"/>
</Border.Background>
</Border>
<StackPanel Grid.Column="1" Orientation="Vertical" Margin="0 5 0 0">
<TextBlock Text="{Binding FullName}" Foreground="Black" FontSize="18" FontWeight="Bold"></TextBlock>
<TextBlock Text="{Binding TwitterHandle}" Foreground="DarkGray" FontSize="12"/>
</StackPanel>
<Image Grid.Column="2" Source="Assets/ActionIcons/Twitter_logo_blue_32.png" Width="32" VerticalAlignment="Top"></Image>
</Grid>
</StackPanel>
<StackPanel Grid.Row="1" Margin="14.5,0,0,0" Height="Auto">
<StackPanel Name="TwContent" Tag="{Binding TweetID}" Margin="15 0 15 0" Tapped="Content_Tapped">
<local:ComplexTextPresenter x:Name="ComplexTextPresenterElement" Input="{Binding Content}" DataContext="{Binding Content}"/>
<ItemsControl ItemsSource="{Binding ContentImages}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Image Source="{Binding }" MaxWidth="350" Margin="0 0 0 5" HorizontalAlignment="Center"></Image>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<TextBlock Foreground="DarkGray" Text="{Binding DateSend}" FontSize="10"></TextBlock>
</StackPanel>
<StackPanel Name="ActionButtons">
<Grid Tag="{Binding TweetID}" Width="380" Height="25" Margin="0 0 0 10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Grid.Column="0" HorizontalAlignment="Center" Margin="20 0 0 0" Style="{StaticResource replyActionButton}" Tapped="Reply_Tapped"></Button>
<ToggleButton Grid.Column="2" HorizontalAlignment="Center" Style="{StaticResource retweetActionButton}" Tapped="Retweet_Tapped"></ToggleButton>
<TextBlock Grid.Column="3" HorizontalAlignment="Left" Margin="-15 0 0 0" VerticalAlignment="Center" Text="{Binding RetweetCount}" Foreground="DarkGray"/>
<ToggleButton x:Name="FavButton" Grid.Column="4" HorizontalAlignment="Center"
Style="{StaticResource likeActionButton}"
IsChecked="{Binding LikeState}"
Tapped="Favourite_Tapped"/>
<TextBlock Grid.Column="5" HorizontalAlignment="Left" Margin="-15 0 0 0" VerticalAlignment="Center" Text="{Binding LikeCount}" Foreground="DarkGray"/>
</Grid>
</StackPanel>
</StackPanel>
</Grid>
</Border>
</Grid>
Input="{Binding Content}"中的内容属性是一个字符串。
输入 属性 绑定出现问题。 ItemsControl 中的绑定工作正常。如异常所述，绑定位于 Line:43 位置：90.
ComplexTextPresenterElement 的代码隐藏如下所示：
public static readonly DependencyProperty InputProperty = DependencyProperty.Register("Input", typeof(string), typeof(UCGlobalTweet), new PropertyMetadata(default(string), InputPropertyChangedCallback));
private static void InputPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var ctrl = dependencyObject as ComplexTextPresenter;
if (ctrl == null)
return;
ctrl.Init();
}
public static readonly DependencyProperty InputCollectionProperty = DependencyProperty.Register("InputCollection", typeof(ObservableCollection<object>), typeof(UCGlobalTweet), new PropertyMetadata(default(ObservableCollection<object>)));
public static readonly DependencyProperty OnHyperlinkCommandProperty = DependencyProperty.Register("OnHyperlinkCommand", typeof(ICommand), typeof(UCGlobalTweet), new PropertyMetadata(default(ICommand)));
private IEnumerable<object> GetParsedInput()
{
List<BaseInputPart> inputParts = new List<BaseInputPart>();
var strings = Input.Split(new[] { " " }, StringSplitOptions.None).ToList();
foreach (var s in strings)
{
if (s.IsHyperlink())
{
inputParts.Add(new HyperLinkPart { Content = s });
}
else
{
inputParts.Add(new LiteralPart { Content = s });
}
}
return inputParts.OfType<object>().ToList();
}
public string Input
{
get { return (string)GetValue(InputProperty); }
set { SetValue(InputProperty, value); }
}
public ObservableCollection<object> InputCollection
{
get { return (ObservableCollection<object>)GetValue(InputCollectionProperty); }
private set { SetValue(InputCollectionProperty, value); }
}
public ICommand OnHyperlinkCommand
{
get { return (ICommand)GetValue(OnHyperlinkCommandProperty); }
set { SetValue(OnHyperlinkCommandProperty, value); }
}
private void Init()
{
InputCollection = new ObservableCollection<object>(GetParsedInput());
}
public ComplexTextPresenter()
{
this.InitializeComponent();
}
public abstract class BaseInputPart
{
public abstract string Content { get; set; }
}
public class HyperLinkPart : BaseInputPart
{
public override string Content { get; set; }
}
public class LiteralPart : BaseInputPart
{
public override string Content { get; set; }
}
//更新：这是 UCGlobalTweet.xaml.cs
public sealed partial class UCGlobalTweet : UserControl
{
private readonly NavigationHelper navigationHelper;
private readonly ObservableDictionary defaultViewModel = new ObservableDictionary();
private readonly ResourceLoader resourceLoader = ResourceLoader.GetForCurrentView("Resources");
//passingparameter
public string MyContentProperty { get; set; }
public UCGlobalTweet()
{
this.InitializeComponent();
Init();
}
private void Init()
{
ComplexTextPresenterElement.Input = "This is where the Content string has to be....";
ComplexTextPresenterElement.OnHyperlinkCommand = new RelayCommand<object>(Execute);
}
private void Execute(object o)
{
//put here the code that can open browser
}
public ObservableDictionary DefaultViewModel
{
get { return this.defaultViewModel; }
}
// Tap user specific content
private void Profile_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("I've clicked on information from Profile --> UserInfoPage");
List<object> passingParameters = new List<object>();
StackPanel st = (StackPanel)sender;
string userIDList = (string)st.Tag;
//provisional Data transfer
// get UserObject out of SearchResult, therefore I have to put the user content as a global variable to access it here, but this will require a lot of space probably...
// So for now I recall the UserObject again.
var usersResponse =
(from user in TweetContent.Connection.User
where user.Type == UserType.Lookup &&
user.UserIdList == userIDList
//user.ScreenNameList == "JoeMayo,Linq2Tweeter"
select user).ToList();
User curUser = usersResponse.FirstOrDefault();
passingParameters.Add(curUser);
(Window.Current.Content as Frame).Navigate(typeof(UserInfoPage), passingParameters);
}
// Tap tweet specific content
private void Content_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("I've clicked the Tweet content --> Going to TweetInfoPage");
List<object> passingParameters = new List<object>();
StackPanel ContentTapped = (StackPanel)sender;
ulong tag = (ulong)ContentTapped.Tag;
var test = TweetContent.FulltweetList;
var tweet = test.FirstOrDefault(tw => tw.TweetID == tag);
passingParameters.Add(tweet);
(Window.Current.Content as Frame).Navigate(typeof(TweetInfoPage), passingParameters);
}
//Action Buttons
private void Reply_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("Reply Button Tapped");
var test = (Button)sender;
e.Handled = true;
Debug.WriteLine("New State for Reply: " + test.IsPressed);
}
private void Retweet_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("Retweet Button Tapped");
//var test = (Button)sender;
//e.Handled = true;
//Debug.WriteLine("New State for Retweet: " + test.IsPressed);
}
private async void Favourite_Tapped(object sender, TappedRoutedEventArgs e)
{
try
{
Debug.WriteLine("Favourite Button Tapped");
ToggleButton tBtn = (ToggleButton)sender;
Grid pGrid = (Grid)tBtn.Parent;
var curTweet = TweetContent.FulltweetList.Where(tw => tw.TweetID.Equals(pGrid.Tag));
if (tBtn.IsChecked == false)
{
Debug.WriteLine("Status should be Checked: " + tBtn.IsChecked);
await TweetContent.Connection.DestroyFavoriteAsync((ulong)pGrid.Tag);
curTweet.First().LikeCount--;
}
if (tBtn.IsChecked == true)
{
Debug.WriteLine("Status should be UnChecked: " + tBtn.IsChecked);
await TweetContent.Connection.CreateFavoriteAsync((ulong)pGrid.Tag);
curTweet.First().LikeCount++;
}
}
catch (Exception ex)
{
Debug.WriteLine("Error while updating Favourite State: Message: " + ex);
}
finally
{
e.Handled = true;
}
}
private void RealLink_Clicked(object sender, RoutedEventArgs e)
{
var hyperlink = sender as Hyperlink;
if (hyperlink == null) return;
//Process.Start(hyperlink.NavigateUri.AbsoluteUri);
}
}
下面是 ComplexTextPresenter.xaml - 我所说的第二个 UserControl
<UserControl
x:Class="TwitterUniversalHubTest1.ComplexTextPresenter"
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"
xmlns:ts="using:TwitterUniversalHubTest1"
xmlns:panel="using:Gregstoll"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400" x:Name="This">
<Grid>
<Grid.Resources>
<DataTemplate x:Key="HyperlinkDataTemplateKey">
<HyperlinkButton Padding="0" Margin="0" FontSize="12" CommandParameter="{Binding }" Command="{Binding ElementName=This, Path=OnHyperlinkCommand}" Content="{Binding Path=Content}" Foreground="Blue"/>
</DataTemplate>
<DataTemplate x:Key="LiteralDataTemplateKey">
<TextBlock Padding="0" Margin="0" FontSize="12" Text="{Binding Path=Content}"></TextBlock>
</DataTemplate>
<ts:MyDataTemplateSelector x:Key="DataTemplateSelectorKey"
LiteralDataTemplate ="{StaticResource LiteralDataTemplateKey}"
HyperlinkDataTemplate="{StaticResource HyperlinkDataTemplateKey}"/>
<Style TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<ContentPresenter HorizontalAlignment="Left" VerticalAlignment="Center" Margin="5,0,0,0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<!--<Rectangle Fill="Green" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>-->
<ListBox Margin="-5 0 0 15" Foreground="Black" ItemsSource="{Binding ElementName=This, Path=InputCollection}" ItemTemplateSelector="{StaticResource DataTemplateSelectorKey}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<panel:UniversalWrapPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ListBox>
</Grid>
干杯， 乌尔平
您的绑定中没有 DataContext、ElementName 或 Source。有几种方法可以使代码工作，我会给你最简单的方法，你可以选择其中的任何一种。
1) 将 UserControl 的 DataContext 设置为 {Binding RelativeSource={RelativeSource Self}}。不过，这是一种糟糕的方法，因为您可能会覆盖现有的 DataContext 或从外部代码中覆盖它。
2) 命名您的 UserControl 并使用 ElementName.
Input="{Binding Content, ElementName=userControl}"
3) 使用{x:Bind}:
Input="{x:Bind Content}"
当您注册您的属性时，您应该传递包含属性的 class 的类型，但您传递的是 typeof(UCGlobalTweet)。你应该这样做：
class ComplexTextPresenterElement
{
public static readonly DependencyProperty InputProperty = DependencyProperty.Register("Input", typeof(string), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(string), InputPropertyChangedCallback));
public static readonly DependencyProperty InputCollectionProperty = DependencyProperty.Register("InputCollection", typeof(ObservableCollection<object>), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(ObservableCollection<object>)));
public static readonly DependencyProperty OnHyperlinkCommandProperty = DependencyProperty.Register("OnHyperlinkCommand", typeof(ICommand), typeof(ComplexTextPresenterElement), new PropertyMetadata(default(ICommand)));
}