我正在表达式混合4中为wpf C＃做一个应用程序。我已经在http://www.jarloo.com/rumormill4/
上关注了RumorMills教程然而，他没有提供完整的教程，所以我已经把他的代码的som试图将其实现到我自己的“家庭媒体中心”应用程序中进行测试。我已经整理了90％的错误，只剩下一个 - 我希望它没有任何额外的错误...你可以在他的帖子中找到问题中未包含的任何其他代码。请参阅下面的代码：
主持新闻自动收报机的屏幕的主要代码文件
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using Microsoft.Expression.Controls;
using MySoftware_Inspire.Feed;
using System.ComponentModel;
namespace blablabla
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
List<string> weatherwords = new List<string> {"weather", "in", "umbrella", "rain", "sun", "sunny", "overcast", "forecast", "cloudy"};
List<string> mathwords = new List<string> {"+", "-", "*", "/", ":"};
String searchInput;
System.Windows.Threading.DispatcherTimer dispatcherTimer;
private readonly FeedManager manager = new FeedManager();
private readonly Ticker<TickerItem> ticker;
private delegate void FeedDelegate(FeedItem itm);
//would be better to detect the height of the titlebar
//and window chrome instead of hardcoding this.
private const int FULL_HEIGHT = 75;
private const int SHORT_HEIGHT = 55;
private int height = FULL_HEIGHT;
public MainWindow()
{
this.InitializeComponent();
Width = SystemParameters.PrimaryScreenWidth;
ticker = new Ticker<TickerItem>(LayoutRoot) {Speed = new TimeSpan(0, 2, 0)};
ticker.ItemDisplayed += ticker_ItemDisplayed;
manager.NewFeedItem += manager_NewFeedItem;
// Insert code required on object creation below this point.
}
private void ticker_ItemDisplayed(object sender, ItemEventArgs<TickerItem> e)
{
txtItems.Text = ticker.Items.Count.ToString();
manager.MarkFeedAsRead(e.Item.FeedItem);
}
private void manager_NewFeedItem(object sender, ItemEventArgs<FeedItem> e)
{
//Got a new article. Marshall to the UI thread
Dispatcher.Invoke(DispatcherPriority.Background, new FeedDelegate(AddItem), e.Item);
}
private void AddItem(FeedItem itm)
{
lock (this)
{
ticker.Items.Enqueue(new TickerItem(itm));
txtItems.Text = ticker.Items.Count.ToString();
}
}
private void homequicktip_DoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
//Doubleclicked to homequicktip notification
DoubleAnimation fadeouthomequicktip = new DoubleAnimation();
fadeouthomequicktip.From = 1;
fadeouthomequicktip.To = 0.0;
fadeouthomequicktip.Duration = new Duration(TimeSpan.FromSeconds(1));
//Play fade out animation on homequicktip
homequicktip.BeginAnimation(Callout.OpacityProperty, fadeouthomequicktip);
}
private void MainWindow_Activated(object sender, System.EventArgs e)
{
//Start feed manager
manager.Start();
//Load up clock and play startup animations
dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0,0,1);
dispatcherTimer.Start();
//Rotate arcs for nice effect
//Arc 1 rotation
DoubleAnimation arcrotateAnim1 = new DoubleAnimation();
arcrotateAnim1.From = -70;
arcrotateAnim1.To = -3600;
arcrotateAnim1.AutoReverse = true;
arcrotateAnim1.Duration = new Duration(TimeSpan.FromSeconds(30));
arcrotateAnim1.RepeatBehavior = RepeatBehavior.Forever;
arc1.RenderTransformOrigin = new Point(0.5, 0.5);
RotateTransform rt = new RotateTransform();
arc1.RenderTransform = rt;
rt.BeginAnimation(RotateTransform.AngleProperty, arcrotateAnim1);
//Arc 2 rotation
DoubleAnimation arcrotateAnim2 = new DoubleAnimation();
arcrotateAnim2.From = 90;
arcrotateAnim2.To = 3690;
arcrotateAnim2.AutoReverse = true;
arcrotateAnim2.Duration = new Duration(TimeSpan.FromSeconds(30));
arcrotateAnim2.RepeatBehavior = RepeatBehavior.Forever;
arc1.RenderTransformOrigin = new Point(0.5, 0.5);
RotateTransform rt2 = new RotateTransform();
arc2.RenderTransform = rt2;
rt2.BeginAnimation(RotateTransform.AngleProperty, arcrotateAnim2);
}
private void Window_Closing(object sender, CancelEventArgs e)
{
manager.Stop();
manager.SaveReadFeeds();
}
private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
{
if (e.HeightChanged)
{
if (e.NewSize.Height != height) Height = height;
}
}
private void btnLock_MouseUp(object sender, MouseButtonEventArgs e)
{
if (WindowStyle == WindowStyle.None)
{
WindowStyle = WindowStyle.ToolWindow;
height = FULL_HEIGHT;
Height = height;
}
else
{
WindowStyle = WindowStyle.None;
height = SHORT_HEIGHT;
Height = height;
}
}
private void btnStop_MouseUp(object sender, MouseButtonEventArgs e)
{
btnStop.Visibility = Visibility.Collapsed;
btnGo.Visibility = Visibility.Visible;
ticker.Stop();
}
private void btnGo_MouseUp(object sender, MouseButtonEventArgs e)
{
btnStop.Visibility = Visibility.Visible;
btnGo.Visibility = Visibility.Collapsed;
ticker.Start();
}
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
//Updating clock
timeLabel.Content = DateTime.Now.ToString();
dispatcherTimer.Start();
}
private void searchTextbox_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key == System.Windows.Input.Key.Enter)
{
//Enter key was pressed - begin search
//Create instance of SearchWindow
SearchWindow SearchWindow = new SearchWindow();
//Memorize current text in TextBox so it doesn't look like we've changed anything
searchInput = searchTextBox.Text;
//Pressed enter on searchTextBox
if (searchTextBox.Text.Contains(" "))
{
//Search input contains spaces which needs to be removed before search can happen
searchTextBox.Text.Replace(" ", "+");
}
//Open search
SearchWindow.searchBrowser.Navigate("http://www.wolframalpha.com/input/?i=" + searchTextBox.Text);
SearchWindow.Show();
}
}
}
}
TickerItem.xaml：
<UserControl
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"
mc:Ignorable="d"
x:Class="Jarloo.RumorMill4.TickerItem"
x:Name="UserControl"
d:DesignWidth="640" d:DesignHeight="480" Height="39">
<Grid Height="39" >
<TextBlock x:Name="PART_TextBlock" Foreground="#FFFFFFFF" Height="18" VerticalAlignment="Top" TextWrapping="NoWrap">
<Hyperlink x:Name="hlLink" RequestNavigate="hpLink_RequestNavigate">
<TextBlock x:Name="txtTitle" Foreground="#FFFFFFFF" TextWrapping="NoWrap"></TextBlock>
</Hyperlink>
</TextBlock>
<TextBlock x:Name="txtDate" Margin="0,12,0,1" Foreground="#FF939393" TextWrapping="NoWrap" FontSize="10"/>
<TextBlock x:Name="txtSource" Margin="0,20,0,1" Foreground="#FFD47432" TextWrapping="NoWrap" FontSize="10" />
</Grid>
</UserControl>
TickerItem.xaml.cs：
using System;
using System.Diagnostics;
using System.Windows.Controls;
using System.Windows.Navigation;
using blablablabla.Feed;
namespace blablablabla
{
public partial class TickerItem
{
public TickerItem(FeedItem item)
{
InitializeComponent();
FeedItem = item;
txtDate.Text = item.PubDate;
txtTitle.Text = item.Title;
if (item.Link.ToLower().StartsWith("http"))
{
try
{
hlLink.NavigateUri = new Uri(item.Link);
}
catch
{
}
}
txtSource.Text = item.Source;
}
public FeedItem FeedItem { get; private set;}
public string PubDate
{
get
{
TextBlock date = (TextBlock)FindName("txtDate");
return date.Text;
}
}
public string Title
{
get
{
return txtTitle.Text;
}
}
public string Url
{
get
{
return hlLink.NavigateUri.ToString();
}
}
public string Source
{
get
{
return txtSource.Text;
}
}
private void hpLink_RequestNavigate(object sender, RequestNavigateEventArgs e)
{
Process.Start(new ProcessStartInfo(e.Uri.ToString()));
}
}
}
Ticker.cs：
using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Threading;
namespace blablablabla
{
public class Ticker<T> where T : FrameworkElement
{
private readonly DispatcherTimer displayTimer = new DispatcherTimer();
public EventHandler<ItemEventArgs<T>> ItemDisplayed;
public bool Running { get; set; }
public double SeperatorSize { get; set; }
public TimeSpan Speed { get; set; }
public Queue<T> Items { get; set; }
public Panel Container { get; private set; }
public void Stop()
{
displayTimer.Stop();
Running = false;
}
public void Start()
{
displayTimer.Start();
displayTimer.Interval = new TimeSpan(0,0,0,1);
Running = true;
}
public Ticker(Panel container)
{
SeperatorSize = 25;
Container = container;
Container.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
Container.Arrange(new Rect(Container.DesiredSize));
Speed = new TimeSpan(0, 0, 0, 40);
Items = new Queue<T>();
displayTimer.Tick += displayTimer_Tick;
displayTimer.Start();
Running = true;
}
private void displayTimer_Tick(object sender, EventArgs e)
{
DisplayNextItem();
}
private void DisplayNextItem()
{
if (Items.Count == 0) return;
T item = Items.Dequeue();
Container.Children.Add(item);
AnimateMove(item);
if (ItemDisplayed != null) ItemDisplayed(this, new ItemEventArgs<T>(item));
}
private void AnimateMove(FrameworkElement e)
{
const double to = -500;
e.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
e.Arrange(new Rect(e.DesiredSize));
double from = Container.ActualWidth;
int unitsPerSec = Convert.ToInt32(Math.Abs(from - to)/Speed.TotalSeconds);
int nextFire = Convert.ToInt32((e.ActualWidth + SeperatorSize)/unitsPerSec);
displayTimer.Stop();
displayTimer.Interval = new TimeSpan(0, 0, nextFire);
displayTimer.Start();
TaggedDoubleAnimation ani = new TaggedDoubleAnimation
{
From = from,
To = to,
Duration = new Duration(Speed),
TargetElement = e
};
ani.Completed += ani_Completed;
TranslateTransform trans = new TranslateTransform();
e.RenderTransform = trans;
trans.BeginAnimation(TranslateTransform.XProperty, ani, HandoffBehavior.Compose);
}
private void ani_Completed(object sender, EventArgs e)
{
Clock clock = (Clock) sender;
TaggedDoubleAnimation ani = (TaggedDoubleAnimation) clock.Timeline;
FrameworkElement element = ani.TargetElement;
Container.Children.Remove(element);
}
}
}
错误如下 - 它可能不是100％正确翻译，因为我是挪威语，错误是用挪威语打印出来的。看看：
错误：
类型blablablabla.TickerItem不能用作泛型类型或方法blablablabla.Ticker中的类型参数T.它不存在任何从blablablabla.TickerItem到System.Windows.FrameworkElement的隐式引用转换
你们中的任何人都知道这意味着什么吗？
我真的被困在这里，请帮忙！谢谢！
答案 0 :(得分：1)
您的XAML中有错：
<UserControl
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"
mc:Ignorable="d"
x:Class="Jarloo.RumorMill4.TickerItem"
x:Name="UserControl"
d:DesignWidth="640" d:DesignHeight="480" Height="39">
属性x:Class应具有以下值：
MySoftware_Inspire.TickerItem
您可能忘记在按照教程
后更改此内容