c# - Enlace de comando No se puede convertir el objeto de tipo ''System.Reflection.RuntimeEventInfo'' para escribir ''System.Reflection.MethodInfo''
relay command wpf (2)
Cuando conecto mi botón a un comando a través de XAML, obtengo un error de tiempo de ejecución System.Windows.Markup.XamlParseException: Proporcionar valor en ''System.Windows.Data.Binding'' lanzó una excepción. ---> System.InvalidCastException: no se puede convertir el objeto de tipo ''System.Reflection.RuntimeEventInfo'' para escribir ''System.Reflection.MethodInfo''.
Cuando elimino el enlace de comando en XAML, todo funciona bien, y mis elementos se muestran, etc. Aquí está el enlace de comando:
Click="{Binding ElementName=MainGrid, Path=DataContext.AlertClickCommand}"
Código para cablear el modelo de vista (en el código detrás de mi ventana):
this.AlertsView.DataContext = GlobalStuff.AlertManager1.AlertViewModel1;
Aquí está mi vista Modelo Mi vista modelo es el contexto de datos de mi vista
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));
}
}
}
Aquí está mi 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>
Aquí está mi orden
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;
}
}
También obtengo el siguiente error de tiempo de diseño (ver captura de pantalla) No se puede convertir el objeto de tipo ''System.Windows.Data.Binding'' para escribir ''Microsoft.Expression.Markup.DocumentModel.DocumentNode''.
Primer error de tiempo de ejecución - Ejecución de tiros
Los errores de tiempo de ejecución posteriores lanzan repetidamente: System.Windows.Markup.XamlParseException: Proporcione un valor en ''System.Windows.Data.Binding'' lanzó una excepción. ---> System.InvalidCastException: no se puede convertir el objeto de tipo ''System.Reflection.RuntimeEventInfo'' para escribir ''System.Reflection.MethodInfo''.
en MS.Internal.Helper.CheckCanReceiveMarkupExtension (MarkupExtension markupExtension, IServiceProvider serviceProvider, DependencyObject & targetDependencyObject, DependencyProperty & targetDependencyProperty)
en System.Windows.Data.BindingBase.ProvideValue (IServiceProvider serviceProvider)
en MS.Internal.Xaml.Runtime.ClrObjectRuntime.CallProvideValue (MarkupExtension me, IServiceProvider serviceProvider)
--- Fin del rastro de la pila de excepción interna ---
en System.Windows.FrameworkTemplate.LoadTemplateXaml (XamlReader templateReader, XamlObjectWriter currentWriter)
.......................
¿Qué tal cambiar este XAML?
<Button Content="{Binding BackgroundMessage}"
HorizontalAlignment="Left" Width="75"
VerticalAlignment="Top" Height="Auto" Margin="2"
Click="{Binding ElementName=MainGrid,
Path=DataContext.AlertClickCommand}"
CommandParameter="{Binding}" />
a esto:
<Button Content="{Binding BackgroundMessage}"
HorizontalAlignment="Left" Width="75"
VerticalAlignment="Top" Height="Auto" Margin="2"
Command="{Binding ElementName=MainGrid,
Path=DataContext.AlertClickCommand}"
CommandParameter="{Binding}" />
No vincula un comando a la propiedad Click . La propiedad Click es para agregar un controlador de eventos tradicional al evento Click . Desea utilizar la propiedad Command para enlazar su comando.
<Button Content="{Binding BackgroundMessage}"
HorizontalAlignment="Left" Width="75"
VerticalAlignment="Top" Height="Auto" Margin="2"
Command="{Binding ElementName=MainGrid,
Path=DataContext.AlertClickCommand}"
CommandParameter="{Binding}" />