我有一个用户控件,将其添加到我的主应用程序中。 该用户控件包含一个用于UI元素的按钮。
用户控件包含DispatchTimer,每2秒钟基于一些整数值确定按钮图像。
在用户控件中调用的方法之一应该设置它的图像,但是控件从未显示更改后的图像。
public void SetNormal()
{
btnFlashAlert.Content = new BitmapImage(new Uri("Images/FlashButton.png", UriKind.RelativeOrAbsolute));
}
我是否漏掉了什么,以使得控件更新的外观在主应用程序中呈现?
当我查看.Content包含的内容时,它是正确的。但界面没有反映出这种变化。
XAML
<UserControl x:Class="SC.FlashSystem.MainButton"
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"
mc:Ignorable="d" Height="53" Width="164">
<Button x:Name="btnFlashAlert" Background="{x:Null}" BorderBrush="{x:Null}" Cursor="Hand" Click="btnFlashAlert_Click">
<Button.Template>
<ControlTemplate>
<Image Source="Images/FlashButton.png"/>
</ControlTemplate>
</Button.Template>
</Button>
Codebehind已更新
public partial class MainButton : UserControl
{
private SupportConsoleWeb.MessageData messageCounts { get; set; }
private readonly DispatcherTimer flashButtonChangeTimer = new DispatcherTimer();
private BitmapImage NormalImage { get; set; }
private BitmapImage CriticalImage { get; set; }
private BitmapImage AlertImage { get; set; }
private BitmapImage InfoImage { get; set; }
public MainButton()
{
InitializeComponent();
messageCounts = new SupportConsoleWeb.MessageData();
messageCounts.CriticalCount = 0;
messageCounts.AlertCount = 0;
messageCounts.InfoCount = 0;
NormalImage = new BitmapImage(new Uri("Images/FlashButton.png", UriKind.RelativeOrAbsolute));
CriticalImage = new BitmapImage(new Uri("Images/FlashButtonRed.png", UriKind.RelativeOrAbsolute));
AlertImage = new BitmapImage(new Uri("Images/FlashButtonOrange.png", UriKind.RelativeOrAbsolute));
InfoImage = new BitmapImage(new Uri("Images/FlashButtonGreen.png", UriKind.RelativeOrAbsolute));
flashButtonChangeTimer.Interval = TimeSpan.FromSeconds(2);
flashButtonChangeTimer.Tick += flashButtonChangeTimer_Tick;
flashButtonChangeTimer.Start();
}
void flashButtonChangeTimer_Tick(object sender, EventArgs e)
{
btnFlashAlert.Dispatcher.BeginInvoke(new Action(() =>
{
if (btnFlashAlert.Content == null)
{
SetNormal();
}
else if (messageCounts.CriticalCount > 0 && btnFlashAlert.Content.Equals(CriticalImage))
{
SetNormal();
}
else if (messageCounts.AlertCount > 0 && btnFlashAlert.Content.Equals(AlertImage))
{
SetNormal();
}
else if (messageCounts.InfoCount > 0 && btnFlashAlert.Content.Equals(InfoImage))
{
SetNormal();
}
else if (messageCounts.CriticalCount > 0)
{
SetCritical();
}
else if (messageCounts.AlertCount > 0)
{
SetAlert();
}
else if (messageCounts.InfoCount > 0)
{
SetInfo();
}
}));
}
public void UpdateMessageCounts(SupportConsoleWeb.MessageData messageCounts)
{
this.messageCounts = messageCounts;
}
private void btnFlashAlert_Click(object sender, RoutedEventArgs e)
{
MainWindow window = new MainWindow();
window.WindowStartupLocation = WindowStartupLocation.CenterScreen;
window.ShowDialog();
}
public void SetMessageCount(int criticalCount, int alertCount, int infoCount)
{
messageCounts.CriticalCount = criticalCount;
messageCounts.AlertCount = alertCount;
messageCounts.InfoCount = infoCount;
}
private void SetNormal()
{
btnFlashAlert.Content = NormalImage;
}
private void SetCritical()
{
btnFlashAlert.Content = CriticalImage;
}
private void SetAlert()
{
btnFlashAlert.Content = AlertImage;
}
private void SetInfo()
{
btnFlashAlert.Content = InfoImage;
}
}
Button.Content
并再次放置相同的图片,即使它能工作,你也看不到任何视觉上的变化。请澄清一下。你有没有打算将其更改为其他内容? - Federico Berasategui