I am using MVVM Light libraries only (from Nuget package) in my Windows Phone 8 project and I want to use EventToCommand in ToggleSwitch. I have these lines of codes:
<toolkit:ToggleSwitch x:Name="LockSwitch"
IsChecked="{Binding IsLock, Mode=TwoWay}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Toggled">
<Command:EventToCommand
Command="{Binding DataContext.NavigateToArticleCommand, ElementName=LayoutRoot}"
CommandParameter="{Binding}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</toolkit:ToggleSwitch>
The problem is that VS shows errors:
Error 1 The name "EventToCommand" does not exist in the namespace
"clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP8".
Error 2 The type 'Command:EventToCommand' was not found. Verify that
you are not missing an assembly reference and that all referenced
assemblies have been built.
Error 3 The tag 'EventToCommand' does not exist in XML namespace
'clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP8'.
I have lines above in file Styles.xaml which is a ResourceDictionary and ToggleSwitch is part of a DataTemplate. I am including MvvmLight library using this line:
xmlns:Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP8"
What's wrong? Why I get that error? I was trying to use google but I couldn't find a solution.
The reference that you use to include the command is wrong. The correct reference is
xmlns:Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Platform"
There's a trick to obtain this reference without writing a single line of code.
After you have downloaded the MvvmLight nuget package, compile your project and then open your xaml file in Expression Blend.
Then click the Assets icon on the left toolbar (the bottom one) and start typing "eventtocommand" (see picture below).
Once you see EventToCommand appear in the Assets panel, drag and drop it on top of your ToggleSwitch. That's it! The reference will be added into your xaml automatically as well as the actual command code.
Why not use Microsoft.Behaviors SDK ? (references, add reference, extensions, behavior sdk) Not sure but I think EventTrigger and mvvm light EventToCommand is deprecated now (because of behaviors sdk).
Code sample with Behaviors.SDK:
xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
xmlns:core="using:Microsoft.Xaml.Interactions.Core"
<toolkit:ToggleSwitch x:Name="LockSwitch"
IsChecked="{Binding IsLock, Mode=TwoWay}">
<interactivity:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Toggled">
<core:InvokeCommandAction Command="{Binding command}" CommandParameter="{Binding param}"/>
</core:EventTriggerBehavior>
</interactivity:Interaction.Behaviors>
</toolkit:ToggleSwitch>
Related
I'm working on a WPF project using MVVM Light and trying to use an EventToCommand, but I get an error message saying:
A value of type 'EventToCommand' cannot be added to a collection or dictionary of type 'TriggerActionCollection'."
I'm using .NET Framework 4.7.2 and the NuGet library Microsoft.Xaml.Behaviors.Wpf.
I've seen most places talking about http://schemas.microsoft.com/expression/2010/interactivity,
but from what I've understood this is now deprecated, and http://schemas.microsoft.com/xaml/behaviors should be used instead.
On mvvmlight.net's changelog I found this:
EventToCommand -
BL0004.005, The type 'EventToCommand' from assembly 'GalaSoft.MvvmLight.Extras.WPF4' is built with an older version of the Blend SDK, and is not supported in a Windows Presentation Framework 4 project.
I've tried changing the projects target framework version, but it didn't seem to make a difference.
Any help would be appreciated.
<UserControl x:Class="DialogueTree.View.DialogueControl"
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"
xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
xmlns:local="clr-namespace:DialogueTree.View"
xmlns:command="http://www.galasoft.ch/mvvmlight"
mc:Ignorable="d"
d:DesignHeight="200" d:DesignWidth="200"
MinHeight="200" MinWidth="200">
<TextBox Text="{Binding Headline}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="LostFocus">
<command:EventToCommand Command="{Binding Source={StaticResource Locator}, Path=DialogueControlVM.EndEditHeadline}"
CommandParameter="{Binding}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
The EventToCommand action from MvvmLight is based on the legacy Blend SDK assemblies.
XML namespace http://schemas.microsoft.com/expression/2010/interactivity
CLR namespace System.Windows.Interactivity
These are in fact deprecated and replaced by the open source XAML behaviors that you use. The issue is that these assemblies are incompatible, so you cannot use the actions provided by MvvmLight with the XAML behaviors and vice-versa. I guess MvvmLight will be updated to use these behaviors in the future, too. Here is an open issue on this topic.
However, you do not need EventToCommand, as the XAML behaviors package already contains a command that does the same: InvokeCommandAction. The property names might be different, though.
<b:EventTrigger EventName="LostFocus">
<b:InvokeCommandAction Command="{Binding Source={StaticResource Locator}, Path=DialogueControlVM.EndEditHeadline}"
CommandParameter="{Binding}"/>
</b:EventTrigger>
I'm build simple application with PRISM 6 and WPF. I want to pass EventArgs to my ViewModel, so far I have this code:
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseWheel">
<prism:InvokeCommandAction Command="{Binding RotaryTableCommand}" TriggerParameterPath="MouseWheel"/>
</i:EventTrigger>
</i:Interaction.Triggers>
The problem I have is in prism:InvokeCommandAction and I got this message: "The type 'invokeCommandAction' from assembly 'Prism.Wpf' is built with an older verision of Blend SDK, and is not supported in WPF4 project.
I realy don't know what should I do.
I am using Caliburn Micro for a Windows Phone app. I have a hyperlink control for which I want to bind the click event to my View Model. Below is the sample code
XAML, MyPage.xaml
<TextBlock>
<Run>Got to</Run>
<Hyperlink micro:Message.Attach="[Event Click] = [Action OpenAnotherPage]">
My Page</Hyperlink><Run Text="."></Run></TextBlock>
ViewModel MyPageViewModel.cs
public void OpenAnotherPage()
{
// some code
}
When I tap on the link, I get an exception
System.Exception: No target found for method
What could be the problem?
Update 1: Tried setting micro:Action.TargetWithoutContext="{Binding ElementName=MyPage, Path=DataContext}" on the Hyperlink control, but it didn't work
Give the TextBlock a name and use that as the ElementName since you have the Hyperlink nested into that control. Then Update1 should work.
Try following XAML (untested):
<Hyperlink>My Page
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<ec:CallMethodAction TargetObject="{Binding}" MethodName="OpenAnotherPage" />
</i:EventTrigger>
</i:Interaction.Triggers>
</Hyperlink>
The namespaces are following (you'll need to reference those 2 assemblies, they're by Microsoft and shipped with MS Expression Blend)
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ec="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions"
I'm trying to create an action for an attached event which I don't think CM supports out of the box.
This question/answer shows how to do this
using attached events with caliburn micro Message.Attach
but it requires using the long CM ActionMessage syntax, however, when I try to do this I get an 'ActionMessage does not exist in the XML namespace ' where blah is the CM namespace.
All of the examples also show this syntax; at the moment I've just put the code into the view which casts the DataContext to the ViewModel type and calls the appropriate method (I don't like this approach though as it couples the view to the VM and it's inconsistent with the rest of the app)
Anyone have any ideas why I can't see the ActionMessage?
e.g.
<i:Interaction.Triggers>
<Helpers:RoutedEventTrigger RoutedEvent="Helpers:DataChanging.Changing">
<!-- this line throws the error -->
<cal:ActionMessage MethodName="SelectedDataChanged">
<cal:Parameter Value="$eventargs" />
</cal:ActionMessage>
</Helpers:RoutedEventTrigger>
</i:Interaction.Triggers>
I'm using SL5 and CM's SL5 assembly but no joy...
Interestingly, if I try to use 'ActionMessage' elsewhere it seems to be resolved correctly but of course it's not very useful outside of where I want it!
Update:
This is the view namespace def
xmlns:cal="http://www.caliburnproject.org"
I've tried the actual assembly qualified namespace and other combinations, all with the same issue
I've never had to use the ActionMessage syntax before, but as long as the control has an event that you're trying to attach to have you tried the following syntax:
<Button Content="Remove" cal:Message.Attach="[Event Click] = [Action Remove($dataContext)]" />
I've been able to use that on a wide variety of controls without any issues.
http://devlicio.us/blogs/rob_eisenberg/archive/2010/07/17/caliburn-micro-soup-to-nuts-pt-3-all-about-actions.aspx
I had similar issues I had to add an extra xaml tag before calling ActionMessage my corresponding sample to get it to work was:
<i:Interaction.Triggers>
<Helpers:RoutedEventTrigger RoutedEvent="Helpers:DataChanging.Changing">
<cal:Action.Target>
<cal:ActionMessage MethodName="SelectedDataChanged">
<cal:Parameter Value="$eventargs"/>
</cal:ActionMessage>
</cal:Action.Target>
</Helpers:RoutedEventTrigger RoutedEvent="Helpers:DataChanging.Changing">
</i:Interaction.Triggers>
I'm trying to use a CallMethodAction bound to a control in a WPF Window, using the method from the Prism library samples and documentation. For some reason, the XAML compiler refuses to acknowldge that the Microsoft.Expression.Interactivity.Core namespace even exists. However, I have no problem using the same classes from the same namespace in the code-behind for that view.
In XAML I've tried both the canonical namespaces:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ic="http://schemas.microsoft.com/expression/2010/interactions"
as well as the CLR namespace:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ic="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions"
The namespace Intellisense pop-up browser displays the first namespace but neither the XML nor CLR namespaces for the second. In either case, the following XAML fails to compile:
<Button HorizontalAlignment="Right" Content="Cancel">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<ic:CallMethodAction />
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
It has no problem finding the Interaction.Triggers tag, but complains that the CallMethodAction tag doesn't exist in the specified namespace. In fact, Intellisense on the ic namespace tag acts as if there is no such namespace. However, I do not get the error that the CLR namespace could not be found, which I do if I try to use a non-existant namespace.
However, in the constructor for this window, I can do this:
var x = new Microsoft.Expression.Interactivity.Core.CallMethodAction();
That compiles and runs fine. How is that even possible?
Try removing and re-adding reference to Microsoft.Expression.Interactions.dll and *.Interactivity.dll
It happened to me once but I don't know why. This is the way I solved it.