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먼저 코드를 게시하고 질문합니다.MVVM 응용 프로그램에서 Entity Framework로 데이터 변경 사항이 지속되지 않습니다.
XAML :
<Window
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:local="clr-namespace:FootballPool" mc:Ignorable="d" x:Class="MainWindow"
xmlns:system="clr-namespace:System;assembly=mscorlib"
Title="MainWindow" Height="350" Width="525" Margin="5">
<Window.Resources>
<local:MainWindowVM x:Key="ViewModel" />
<ObjectDataProvider x:Key="YearList"
ObjectType="{x:Type local:MainWindowVM}"
MethodName="YearList" />
<ObjectDataProvider x:Key="WeekList"
ObjectType="{x:Type local:MainWindowVM}"
MethodName="WeekList">
<ObjectDataProvider.MethodParameters>
<system:Int32>0</system:Int32>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</Window.Resources>
<Grid>
<TabControl Margin="0,0,0,37">
<TabItem Header="Standings">
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Header="Users">
<Grid Background="#FFE5E5E5">
<DataGrid
x:Name="dgUsers"
DataContext="{Binding Source={StaticResource ViewModel}}"
ItemsSource="{Binding Users, Mode=TwoWay}" AutoGenerateColumns="False"
IsSynchronizedWithCurrentItem="True"
>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding FirstName}" ClipboardContentBinding="{x:Null}" Header="First Name"/>
<DataGridTextColumn Binding="{Binding LastName}" ClipboardContentBinding="{x:Null}" Header="Last Name"/>
<DataGridTextColumn Binding="{Binding Email}" ClipboardContentBinding="{x:Null}" Header="Email"/>
<DataGridTextColumn Binding="{Binding Password}" ClipboardContentBinding="{x:Null}" Header="Password"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
</TabItem>
<TabItem Header="Weekly Settings">
<Grid Background="#FFE5E5E5">
<Grid x:Name="Grid1" HorizontalAlignment="Left" VerticalAlignment="Top" Background="#FFC8C8C8" Margin="238,27,0,0" DataContext="{Binding SelectedItem, ElementName=listBox}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Content="Year:" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="0" VerticalAlignment="Center"/>
<TextBox x:Name="Year" Grid.Column="1" HorizontalAlignment="Left" Height="24" Margin="3" Grid.Row="0" Text="{Binding Year, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" VerticalAlignment="Center" Width="120"/>
<Label Content="Week Number:" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="1" VerticalAlignment="Center"/>
<TextBox x:Name="WeekNumberTextBox" Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="1" Grid.Row="1" Text="{Binding WeekNumber, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" VerticalAlignment="Center" Width="120"/>
<Label Content="Begin Date:" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="2" VerticalAlignment="Center"/>
<DatePicker x:Name="BeginDateDatePicker" Grid.Column="1" HorizontalAlignment="Left" Margin="3" Grid.Row="2" SelectedDate="{Binding BeginDate, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" VerticalAlignment="Center"/>
<Label Content="End Date:" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="3" VerticalAlignment="Center"/>
<DatePicker x:Name="EndDateDatePicker" Grid.Column="1" HorizontalAlignment="Left" Margin="3" Grid.Row="3" SelectedDate="{Binding EndDate, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" VerticalAlignment="Center"/>
<Label Content="Cost:" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="4" VerticalAlignment="Center"/>
<TextBox x:Name="CostTextBox" Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="3" Grid.Row="4" Text="{Binding Cost, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" VerticalAlignment="Center" Width="120"/>
</Grid>
<Button x:Name="btnNewWeek" Content="New Week" HorizontalAlignment="Left" Height="23" Margin="384,192,0,0" VerticalAlignment="Top" Width="75"/>
<ComboBox x:Name="cboYear"
HorizontalAlignment="Left" Margin="94,14,0,0"
VerticalAlignment="Top" Width="56"
IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding Mode=OneWay, Source={StaticResource YearList}}">
<ComboBox.SelectedItem>
<Binding Source="{StaticResource WeekList}"
Path="MethodParameters[0]"
BindsDirectlyToSource="True"
UpdateSourceTrigger="PropertyChanged" />
</ComboBox.SelectedItem>
</ComboBox>
<ListBox x:Name="listBox" HorizontalAlignment="Left" Height="136" Margin="95,51,0,0" VerticalAlignment="Top" Width="55" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Source={StaticResource WeekList}}" DisplayMemberPath="WeekNumber" />
<Label Content="Year:" HorizontalAlignment="Left" Margin="27,10,0,0" VerticalAlignment="Top"/>
<Label Content="Week:" HorizontalAlignment="Left" Margin="27,51,0,0" VerticalAlignment="Top"/>
</Grid>
</TabItem>
</TabControl>
<Button Content="Save" HorizontalAlignment="Right" Height="27" Margin="0,0,5,5" VerticalAlignment="Bottom" Width="80" Click="Button_Click"/>
</Grid>
</Window>
뷰 모델 :
Imports System.Collections.ObjectModel
Imports System.ComponentModel
Imports System.Collections.Specialized
Public Class MainWindowVM
Implements INotifyPropertyChanged
Implements INotifyCollectionChanged
Dim dbcontext As New FootballPoolEntities
Private _Users As ObservableCollection(Of User)
Private _Settings As ObservableCollection(Of ScheduleSetting)
Public Property Users As ObservableCollection(Of User)
Get
Return _Users
End Get
Set(value As ObservableCollection(Of User))
_Users = value
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("Users"))
End Set
End Property
Public Property Settings As ObservableCollection(Of ScheduleSetting)
Get
Return _Settings
End Get
Set(value As ObservableCollection(Of ScheduleSetting))
_Settings = value
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("Settings"))
End Set
End Property
Public Sub New()
_Users = New ObservableCollection(Of User)(dbcontext.Users.ToList)
_Settings = New ObservableCollection(Of ScheduleSetting)(dbcontext.ScheduleSettings.ToList)
AddHandler Users.CollectionChanged, AddressOf OnUsersCollectionChanged
AddHandler Settings.CollectionChanged, AddressOf OnSettingsCollectionChanged
End Sub
Public Event PropertyChanged(sender As Object, e As PropertyChangedEventArgs) Implements INotifyPropertyChanged.PropertyChanged
Public Event CollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs) Implements INotifyCollectionChanged.CollectionChanged
Private Sub OnUsersCollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs)
If e.Action = NotifyCollectionChangedAction.Add Then
For Each item In e.NewItems
dbcontext.Users.Add(item)
Next
End If
If e.Action = NotifyCollectionChangedAction.Remove Then
For Each item In e.OldItems
dbcontext.Users.Remove(item)
Next
End If
End Sub
Private Sub OnSettingsCollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs)
If e.Action = NotifyCollectionChangedAction.Add Then
For Each item In e.NewItems
dbcontext.ScheduleSettings.Add(item)
Next
End If
If e.Action = NotifyCollectionChangedAction.Remove Then
For Each item In e.OldItems
dbcontext.ScheduleSettings.Remove(item)
Next
End If
End Sub
Public Sub SaveChanges()
dbcontext.SaveChanges()
End Sub
Public Sub NewWeek()
Dim newWeek As New ScheduleSetting
Settings.Add(newWeek)
End Sub
Public Function WeekList(SelectedYear As Int32) As ObservableCollection(Of ScheduleSetting)
If SelectedYear = 0 Then
Return Nothing
Exit Function
End If
Return New ObservableCollection(Of ScheduleSetting)(Settings.Where(Function(c) c.Year = SelectedYear).ToList)
End Function
Public Function YearList() As List(Of Int32)
Return dbcontext.ScheduleSettings _
.Select(Function(x) x.Year) _
.Distinct.ToList()
End Function
End Class
난 데 문제는 내 목록 상자가 설정 설정해이다 "WeekList"방법 및 ObjectDataProvider를 통해 객체. 내 세부 그리드는 해당 목록 상자의 SelectedItem에 바인딩 된 datacontext 있습니다. 데이터를 변경할 때 savechanges를 수행 할 때 엔티티 프레임 워크로 되돌아 가지 않습니다. 제가 구속력있는 것을 놓치고 있습니까? 마스터 디테일을 다르게 처리해야합니까? 또는 내 ViewModel에 내가 추가해야 할 무언가가 있습니까?
누군가가 제공 할 수있는 도움에 감사드립니다. 감사.