我有一个用户控件（radwindow），该任务正在添加新项目。
我从父窗口调用此窗口，但是当我关闭此模态控件并再次调用它时，我看到viewmodel与之前相同，所以我控制了旧数据。 Ofcource我需要控制空字段：）
我正在使用MVVM Light。我知道它可能是Messenger的内容，但我没有看到我的代码有任何问题。
<telerik:RadWindow x:Class="MyAppApp.View.AddMessageTemplateView"
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:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:prismvm="clr-namespace:Microsoft.Practices.Prism.ViewModel;assembly=Microsoft.Practices.Prism"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.SL4"
xmlns:Converters="clr-namespace:MyAppApp.Converters"
xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"
xmlns:HTMLParsing="clr-namespace:MyAppApp.Helpers.HTMLParsing" mc:Ignorable="d"
DataContext="{Binding AddMessageTemplate, Source={StaticResource Locator}}" d:DesignHeight="300" d:DesignWidth="400" WindowStartupLocation="CenterScreen"
ResizeMode="NoResize" Width="355" >
<telerik:RadWindow.Resources>
<Converters:RadioButtonConverter x:Key="RadioButtonConverter"/>
<Converters:EnumsMatchToVisibilityConverter x:Key="EnumsMatchToVisibilityConverter"/>
</telerik:RadWindow.Resources>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
<RowDefinition Height="40"/>
</Grid.RowDefinitions>
<TextBlock Text="{Binding Path=MyAppResources.label_PleaseSelectTypeOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<StackPanel Grid.Row="1" Orientation="Horizontal">
<RadioButton Content="Email" Margin="0 0 10 0"
GroupName="MessageTypes"
IsChecked="{Binding SelectedType, Mode=TwoWay, ConverterParameter=Email,
Converter={StaticResource RadioButtonConverter}}" />
<RadioButton Content="SMS" Margin="0 0 10 0"
GroupName="MessageTypes"
IsChecked="{Binding SelectedType, Mode=TwoWay, ConverterParameter=Sms,
Converter={StaticResource RadioButtonConverter}}" />
</StackPanel>
<!--Place for New Item> -->
<StackPanel Grid.Row="2" HorizontalAlignment="Stretch">
<Grid
x:Name="DetailsGrid">
<prismvm:DataTemplateSelector
Content="{Binding NewTemplate}" HorizontalContentAlignment="Stretch">
<prismvm:DataTemplateSelector.Resources>
<DataTemplate
x:Key="EmailMessageTemplate">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Path=MyAppResources.label_NameOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<TextBox Text="{Binding Name,Mode=TwoWay}" HorizontalAlignment="Stretch" />
<TextBlock Text="{Binding Path=MyAppResources.label_SubjectOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<TextBox Text="{Binding EmailSubject,Mode=TwoWay}" HorizontalAlignment="Stretch"/>
<StackPanel Orientation="Vertical">
<RadioButton Content="HTML" Margin="0 0 10 0"
GroupName="EmailFormat"
IsChecked="{Binding EmailFormat, Mode=TwoWay, ConverterParameter=HTML,
Converter={StaticResource RadioButtonConverter}}" />
<RadioButton Content="Plain Text" Margin="0 0 10 0"
GroupName="EmailFormat" x:Name="PlainTextRadioButton"
IsChecked="{Binding EmailFormat, Mode=TwoWay, ConverterParameter=PlainText,
Converter={StaticResource RadioButtonConverter}}" />
</StackPanel>
<TextBlock Text="{Binding Path=MyAppResources.label_BodyOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<ScrollViewer MaxHeight="100" HorizontalAlignment="Stretch" Margin="0,10,0,10" Name="scrollViewerEmailBody" VerticalAlignment="Top">
<TextBox Text="{Binding Body,Mode=TwoWay}" TextWrapping="Wrap" AcceptsReturn="True" />
</ScrollViewer>
<ScrollViewer HorizontalAlignment="Stretch" Margin="0,10,0,10" Name="scrollViewerEmail2RadHtmlPlaceholder" Visibility="{Binding EmailFormat,ConverterParameter=HTML,Converter={StaticResource EnumsMatchToVisibilityConverter}}" >
<HTMLParsing:HtmlTextBlock Html="{Binding Body}"/>
</ScrollViewer>
</StackPanel>
</DataTemplate>
<DataTemplate
x:Key="SmsMessageTemplate">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Path=MyAppResources.label_NameOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<TextBox Text="{Binding Name,Mode=TwoWay}" HorizontalAlignment="Stretch" />
<TextBlock Text="{Binding Path=MyAppResources.label_BodyOfMessageTemplate, Source={StaticResource ResourcesWrapper}}"/>
<ScrollViewer MaxHeight="100" HorizontalAlignment="Stretch" Margin="0,10,0,10" VerticalAlignment="Top">
<TextBox Text="{Binding Body,Mode=TwoWay}" TextWrapping="Wrap" AcceptsReturn="True" />
</ScrollViewer>
</StackPanel>
</DataTemplate>
</prismvm:DataTemplateSelector.Resources>
</prismvm:DataTemplateSelector>
</Grid>
</StackPanel>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center"
Grid.Row="3" Grid.Column="0">
<telerik:RadButton x:Name="btnOK" Width="120" Content="{Binding Path=MyAppResources.OkSoeDialog, Source={StaticResource ResourcesWrapper}}"
Margin="5" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<Command:EventToCommand Command="{Binding Source={StaticResource Locator}, Path= AddMessageTemplate.SaveCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</telerik:RadButton>
<telerik:RadButton x:Name="btnCancel" Width="120" Content="{Binding Path=MyAppResources.CancelSoeDialog, Source={StaticResource ResourcesWrapper}}"
Margin="5" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<Command:EventToCommand Command="{Binding Source={StaticResource Locator}, Path= AddMessageTemplate.CancelCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</telerik:RadButton>
</StackPanel>
</Grid>
</telerik:RadWindow>
以下是radwindow
public partial class AddMessageTemplateView : RadWindow
{
/// <summary>
/// Initializes a new instance of the AddMessageTemplateView class.
/// </summary>
public AddMessageTemplateView()
{
InitializeComponent();
(this.DataContext as AddMessageTemplateViewModel).RequestClose += Close;
}
}
using System;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using Telerik.Windows.Controls;
using MyAppUtils.DataModel;
using MyAppUtils.DataModel.Messaging;
using ViewModelBase = GalaSoft.MvvmLight.ViewModelBase;
namespace MyAppApp.ViewModel
{
/// <summary>
/// This class contains properties that a View can data bind to.
/// <para>
/// Use the <strong>mvvminpc</strong> snippet to add bindable properties to this ViewModel.
/// </para>
/// <para>
/// You can also use Blend to data bind with the tool's support.
/// </para>
/// <para>
/// See http://www.galasoft.ch/mvvm/getstarted
/// </para>
/// </summary>
public class AddMessageTemplateViewModel : ViewModelBase
{
private MessageTemplate _newTemplate;
private MessageType _selectedtype;
private string SelectedTypePropertyName = "SelectedType";
private string NewTemplatePropertyName = "NewTemplate";
/// <summary>
/// Initializes a new instance of the AddMessageTemplateViewModel class.
/// </summary>
public AddMessageTemplateViewModel()
{
InitiateCommands();
////if (IsInDesignMode)
////{
//// // Code runs in Blend --> create design time data.
////}
////else
////{
//// // Code runs "for real": Connect to service, etc...
////}
}
public MessageTemplate NewTemplate
{
get { return _newTemplate; }
set
{
if (_newTemplate != value)
{
_newTemplate = value;
RaisePropertyChanged(NewTemplatePropertyName);
}
}
}
public void InitiateCommands()
{
SaveCommand = new RelayCommand(Save);
CancelCommand = new RelayCommand(Cancel);
}
private void Cancel()
{
Messenger.Default.Send(new NotificationMessage(this, "Cancel"));
Close();
}
private void Save()
{
//TODO: walidacja jak w customervehicle
if (String.IsNullOrEmpty(NewTemplate.Error))
{
Messenger.Default.Send(new NotificationMessage<MessageTemplate>(this, NewTemplate, "Add"));
Close();
}
else
{
RadWindow.Alert(NewTemplate.Error);
}
}
public RelayCommand SaveCommand { get; private set; }
public RelayCommand CancelCommand { get; private set; }
public MessageType SelectedType
{
get { return _selectedtype; }
set
{
if (_selectedtype != value)
{
_selectedtype = value;
RaisePropertyChanged(SelectedTypePropertyName);
if (_selectedtype.ToString() == MessageType.Email.ToString())
{
NewTemplate = new EmailMessageTemplate();
}
else if (_selectedtype.ToString() == MessageType.Sms.ToString())
{
NewTemplate = new SmsMessageTemplate();
}
else
{
NewTemplate = null;
}
}
}
}
public event Action RequestClose;
public virtual void Close()
{
if (RequestClose != null)
{
RequestClose();
}
}
}
}
父控制代码的一部分
private void HandleNotification(NotificationMessage obj)
{
if (obj.Notification == "ShowAddMessageTemplate")
{
var ShowAddMessageTemplateRadWindow = new AddMessageTemplateView();
ShowAddMessageTemplateRadWindow.Show();
}
}
父母控制的模型：
private void ShowAddMessageTemplate()
{
Messenger.Default.Send(new NotificationMessage(this, "ShowAddMessageTemplate"));
Messenger.Default.Register<NotificationMessage<MessageTemplate>>(this, HandleMessageTemplateAdding);
}
private void HandleMessageTemplateAdding(NotificationMessage<MessageTemplate> notificationMessage)
{
if (notificationMessage.Notification=="Add")
{
ServiceAgent.AddMessageTemplate(notificationMessage.Content,_App.HandlerId,GetMessageTemplates);
}
}
答案 0 :(得分：0)
我通过添加到AddMessageTemplateView的构造函数来解决这个问题：
this.Closed += (s, e) => ViewModelLocator.ClearAddMessageTemplate();
和ClearAddMessageTemplateI是：
public static void ClearAddMessageTemplate()
{
_addMessageTemplate.Cleanup();
_addMessageTemplate = null;
}