When I wire up my button to a command via XAML, I'm getting a run time error System.Windows.Markup.XamlParseException: Provide value on 'System.Windows.Data.Binding' threw an exception. ---> System.InvalidCastException: Unable to cast object of type 'System.Reflection.RuntimeEventInfo' to type 'System.Reflection.MethodInfo'.
When I remove the command binding in XAML everything works okay, and my items display etc.. Here is the command binding:
Click="{Binding ElementName=MainGrid, Path=DataContext.AlertClickCommand}"
Code to wire up view model (in code behind of my window):
this.AlertsView.DataContext = GlobalStuff.AlertManager1.AlertViewModel1;
Here is my view Model My view model is the data context of my view
using System.Collections.Generic;
using System.ComponentModel;
using Arkle.SharedUI.Model;
using Arkle.SharedUI.ViewModel.Commands;
namespace Arkle.SharedUI.ViewModel
{
public class AlertViewModel : INotifyPropertyChanged
{
private List<Alert> _alerts = new List<Alert>();
public List<Alert> Alerts
{
get { return _alerts; }
set
{
_alerts = value;
OnPropertyChanged("Alerts");
}
}
public AlertViewModel()
{
if (DesignerProperties.IsInDesignMode)
{
LoadDesignTimeData();
}
}
private void LoadDesignTimeData()
{
Alerts.Add(new Alert { BackgroundMessage = "Sis", IsAlerting = true, OverlayMessage = "3 mins", Tip = "Sis Data not received for 3 mins" });
Alerts.Add(new Alert { BackgroundMessage = "Bets", IsAlerting = true, OverlayMessage = "4", Tip = "4 unchecked danger bets" });
Alerts.Add(new Alert { BackgroundMessage = "Texts", IsAlerting = false, OverlayMessage = "3", Tip = "3 Unchecked Text Bets" });
}
private AlertClickCommand _alertClickCommand;
public AlertClickCommand AlertClickCommand
{
get { return _alertClickCommand ?? (_alertClickCommand = new AlertClickCommand(this)); }
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Here is my xaml
<UserControl x:Class="Arkle.SharedUI.View.AlertsView"
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:viewModel="clr-namespace:Arkle.SharedUI.ViewModel"
mc:Ignorable="d"
d:DataContext="{d:DesignInstance Type=viewModel:AlertViewModel, IsDesignTimeCreatable=True}"
x:Name="EarlyPriceEditorViewModelWindow"
Height="Auto" Width="Auto">
<UserControl.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</UserControl.Resources>
<Grid Name="MainGrid">
<StackPanel Name="MainStackPanel">
<ListBox ItemsSource="{Binding Path=Alerts}" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" >
</WrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Visibility="{Binding IsAlerting,Converter={StaticResource BooleanToVisibilityConverter}}">
<StackPanel Orientation="Horizontal">
<Button Content="{Binding BackgroundMessage}" HorizontalAlignment="Left" Width="75" VerticalAlignment="Top" Height="Auto" Margin="2"
Click="{Binding ElementName=MainGrid, Path=DataContext.AlertClickCommand}" CommandParameter="{Binding}"
/>
<Label Content="{Binding OverlayMessage}" HorizontalAlignment="Left" Width="Auto" Margin="1,0,0,0" VerticalAlignment="Top" Background="Red" Foreground="White"
FontWeight="Bold">
<Label.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding IsAlerting}" Value="True">
<Setter Property="Image.Visibility" Value="Visible" />
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="ImageFlash">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(UIElement.Opacity)"
BeginTime="0:0:0" Duration="0:0:0.5"
From="1.0" To="0.0" RepeatBehavior="Forever" AutoReverse="True"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="ImageFlash" />
</DataTrigger.ExitActions>
</DataTrigger>
<DataTrigger Binding="{Binding IsAlerting}" Value="False">
<DataTrigger.Setters>
<Setter Property="Image.Visibility" Value="Collapsed" />
</DataTrigger.Setters>
</DataTrigger>
</Style.Triggers>
</Style>
</Label.Style>
</Label>
<Label Content="|" Margin="5"/>
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
</Grid>
</UserControl>
Here is my command
using System;
using System.Windows.Input;
using Arkle.Common;
using Arkle.SharedUI.Events;
using Arkle.SharedUI.Model;
namespace Arkle.SharedUI.ViewModel.Commands
{
public class AlertClickCommand : ICommand
{
private AlertViewModel _alertViewModel;
public AlertClickCommand(AlertViewModel alertViewModel)
{
_alertViewModel = alertViewModel;
}
public void Execute(object parameter)
{
if (parameter == null)
{
return;
}
var parameterAsAlert = (Alert)parameter;
switch (parameterAsAlert.BackgroundMessage)
{
case "Bets":
EventManager.Instance.GetEvent<ShowDangerBetsRequestedEvent>().Publish(null);
break;
default:
return;
}
}
public bool CanExecute(object parameter)
{
return true;
}
public event EventHandler CanExecuteChanged;
}
}
I also get the following design time error (see screenshot) Unable to cast object of type 'System.Windows.Data.Binding' to type 'Microsoft.Expression.Markup.DocumentModel.DocumentNode'.
First Runtime Error - Throws Run
Subsequent runtime errors throws repeatedly: System.Windows.Markup.XamlParseException: Provide value on 'System.Windows.Data.Binding' threw an exception. ---> System.InvalidCastException: Unable to cast object of type 'System.Reflection.RuntimeEventInfo' to type 'System.Reflection.MethodInfo'.
at MS.Internal.Helper.CheckCanReceiveMarkupExtension(MarkupExtension markupExtension, IServiceProvider serviceProvider, DependencyObject& targetDependencyObject, DependencyProperty& targetDependencyProperty)
at System.Windows.Data.BindingBase.ProvideValue(IServiceProvider serviceProvider)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CallProvideValue(MarkupExtension me, IServiceProvider serviceProvider)
--- End of inner exception stack trace ---
at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader, XamlObjectWriter currentWriter)
.......................
DataContext? Where is your view model code (at least the property)? And for goodness sake, please delete that ridiculously long stack trace, unless you are intending on putting users off reading your question. - Sheridan