WPF - 基于 listviewitem 选择的更改控件。控件不更新
WPF - Change Controls based on listviewitem selection. Controls not updating
我正在尝试根据用户选择的 listviewitem 更新我的 Main Window 上的控件，但是当 listviewitem 选择更改时，控件不会更新。
我用这个post作为参考How to dynamically change a WPF control's template using a checkbox?
编辑：我最初使用 ContentTemplate，但根据建议将其更改为 DataTemplate，但它仍然没有更新
我的 Main Window 的 XMAL 是
<Window.Resources>
<DataTemplate x:Key="Default">
<Grid Margin="20,280,0,0" />
</DataTemplate>
<DataTemplate x:Key="ERAFileSelect">
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="218" Margin="20,280,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid Name="grdFileSelect">
<Label x:Name="lblProcessContent" Content="Drag File or Manually Select File" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<TextBox x:Name="txtEraFileName" HorizontalAlignment="Left" Height="23" Margin="10,80,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="235"/>
<Button x:Name="btnSelectFiles" Content="Manually Select File(s)" HorizontalAlignment="Left" Margin="10,161,0,0" VerticalAlignment="Top" Width="235" Height="45"/>
</Grid>
</Border>
</DataTemplate>
<DataTemplate x:Key="FCSFileSelect">
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="218" Margin="20,280,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid Name="grdFileSelect">
<Label x:Name="lblProcessContent" Content="Drag File or Manually Select Files" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<TextBox x:Name="txtFCSFileName_TQ02" HorizontalAlignment="Left" Height="23" Margin="10,40,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ02" Content="Select" HorizontalAlignment="Left" Margin="189,37,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
<TextBox x:Name="txtFCSFileName_TQ11" HorizontalAlignment="Left" Height="23" Margin="10,105,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ11" Content="Selec" HorizontalAlignment="Left" Margin="189,100,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
<TextBox x:Name="txtFCSFileName_TQ16" HorizontalAlignment="Left" Height="23" Margin="10,170,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ16" Content="Select" HorizontalAlignment="Left" Margin="189,165,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
</Grid>
</Border>
</DataTemplate>
</Window.Resources>
<Grid Margin="0,0,2,0">
<GroupBox x:Name="gbxProgress" Header="Progress" HorizontalAlignment="Left" Margin="298,105,0,0" VerticalAlignment="Top" Height="445" Width="462" Foreground="Black">
<ListBox x:Name="lbxProgress" HorizontalAlignment="Left" Height="408" Margin="10,10,0,0" VerticalAlignment="Top" Width="431" Foreground="Black" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Progress.Message}" />
</GroupBox>
<Button x:Name="btnStart" Content="Start" HorizontalAlignment="Left" Margin="20,513,0,0" VerticalAlignment="Top" Width="100" Height="37" IsEnabled="{Binding Properties.StartButtonEnabled}" Click="btnStart_Click"/>
<Button x:Name="btnCancel" Content="Cancel" HorizontalAlignment="Left" Margin="177,513,0,0" VerticalAlignment="Top" Width="100" Height="37"/>
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="70" Margin="20,21,0,0" VerticalAlignment="Top" Width="740" CornerRadius="15">
<Grid>
<Image HorizontalAlignment ="Left" Margin="10" Height="50" Width="50" VerticalAlignment="Center" Source="/Lib/Icons/User.png" />
<TextBlock Name="txtUser" FontSize="20" Height="30" Width="200" Foreground="Red" HorizontalAlignment="Left" Margin="78,19,0,19"/>
<Image HorizontalAlignment ="Left" Margin="443,8,0,10" Height="50" Width="50" VerticalAlignment="Center" Source="Lib/Icons/Watch.png" />
<TextBlock x:Name="txtRunTime" FontSize="20" Height="30" Width="200" Foreground="Red" HorizontalAlignment="Left" Margin="519,19,0,19" Text="{Binding AppRunTime.TimeElapsed}" />
</Grid>
</Border>
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="144" Margin="20,119,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid>
<Label x:Name="lblProcessSelection" Content="Process Selection" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<ListView x:Name="lvProcessSelection" HorizontalAlignment="Left" Height="93" Margin="10,30,0,0" VerticalAlignment="Top" Width="235" BorderThickness="0" SelectionChanged="lvProcessSelection_SelectionChanged">
<ListViewItem Name="itmERA" Content="Expense Reserve Automation"/>
<ListViewItem Name="itmFCS" Content="Financial Close Status"/>
<ListViewItem Name="itmPEL" Content="Peel"/>
</ListView>
</Grid>
</Border>
<ContentControl DataContext="{Binding Properties}" Content="{Binding}">
<ContentControl.Style>
<Style TargetType="ContentControl">
<Setter Property="ContentTemplate" Value="{StaticResource ERAFileSelect}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding SelectedProcess}" Value="Expense Reserve Automation">
<Setter Property="ContentTemplate" Value="{StaticResource ERAFileSelect}" />
</DataTrigger>
<DataTrigger Binding="{Binding SelectedProcess}" Value="Financial Close Status">
<Setter Property="ContentTemplate" Value="{StaticResource FCSFileSelect}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</Grid>
ViewModel 代码为
public class MainWindowModel
{
public ApplicationRunTime AppRunTime { get; set; }
public LogMessage Progress { get; set; }
public MainWindowProperties Properties { get; set; }
public MainWindowModel()
{
AppRunTime = new ApplicationRunTime();
Progress = new LogMessage();
Properties = new MainWindowProperties();
Properties.StartButtonEnabled = false;
}
}
具有主要Window属性class
public class MainWindowProperties
{
public bool StartButtonEnabled { get; set; }
public string SelectedProcess { get; set; }
}
在我的 MainWindow 构造函数中，我设置了 DataContext
mainWindowModel = new MainWindowModel();
this.DataContext = mainWindowModel;
当 lvProcessSelection 中的选择发生变化时，将执行以下代码
if (lvProcessSelection.SelectedItems.Count > 0)
{
mainWindowModel.Properties.SelectedProcess = ((ListViewItem)lvProcessSelection.SelectedItem).Content.ToString();
}
else
{
mainWindowModel.Properties.SelectedProcess = string.Empty;
}
这将使用 "Expense Reserve Automation" 或 "Financial Close Status"
更新我的 ViewModel 中的 SelectedProcess
我知道我的 ViewModel 的 DataContext 设置正确（但可能不适用于 ContentControl），因为我能够使用新消息更新 lbxProgress 并使用应用程序 RunTime 更新 txtRunTime
然而，当我更改 lvProcessSelection 上的选择时，没有任何反应； ERAFileSelect 的默认控件保留。
任何人都可以指出正确的方向来解决这个问题吗？
为什么不使用数据模板？数据模板将在这种情况下工作。
Could anybody point me in the right direction on how to solve this?
您的 MainWindowProperties class 应该实现 INotifyPropertyChanged 接口并在 SelectedProcess 属性 设置为新值时发出更改通知：
public class MainWindowProperties : INotifyPropertyChanged
{
public bool StartButtonEnabled { get; set; }
private string _selectedProcess;
public string SelectedProcess
{
get { return _selectedProcess; }
set { _selectedProcess = value; NotifyPropertyChanged(); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
请参阅 MSDN 以获取有关此公共接口的更多信息：https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx
您绑定到的每个视图 model/model 都必须实现此接口并为要更新的视图中的任何目标值发出更改通知。
我正在尝试根据用户选择的 listviewitem 更新我的 Main Window 上的控件，但是当 listviewitem 选择更改时，控件不会更新。
我用这个post作为参考How to dynamically change a WPF control's template using a checkbox?
编辑：我最初使用 ContentTemplate，但根据建议将其更改为 DataTemplate，但它仍然没有更新
我的 Main Window 的 XMAL 是
<Window.Resources>
<DataTemplate x:Key="Default">
<Grid Margin="20,280,0,0" />
</DataTemplate>
<DataTemplate x:Key="ERAFileSelect">
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="218" Margin="20,280,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid Name="grdFileSelect">
<Label x:Name="lblProcessContent" Content="Drag File or Manually Select File" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<TextBox x:Name="txtEraFileName" HorizontalAlignment="Left" Height="23" Margin="10,80,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="235"/>
<Button x:Name="btnSelectFiles" Content="Manually Select File(s)" HorizontalAlignment="Left" Margin="10,161,0,0" VerticalAlignment="Top" Width="235" Height="45"/>
</Grid>
</Border>
</DataTemplate>
<DataTemplate x:Key="FCSFileSelect">
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="218" Margin="20,280,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid Name="grdFileSelect">
<Label x:Name="lblProcessContent" Content="Drag File or Manually Select Files" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<TextBox x:Name="txtFCSFileName_TQ02" HorizontalAlignment="Left" Height="23" Margin="10,40,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ02" Content="Select" HorizontalAlignment="Left" Margin="189,37,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
<TextBox x:Name="txtFCSFileName_TQ11" HorizontalAlignment="Left" Height="23" Margin="10,105,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ11" Content="Selec" HorizontalAlignment="Left" Margin="189,100,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
<TextBox x:Name="txtFCSFileName_TQ16" HorizontalAlignment="Left" Height="23" Margin="10,170,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="174"/>
<Button x:Name="btnSelectFiles_TQ16" Content="Select" HorizontalAlignment="Left" Margin="189,165,0,0" VerticalAlignment="Top" Width="56" Height="28"/>
</Grid>
</Border>
</DataTemplate>
</Window.Resources>
<Grid Margin="0,0,2,0">
<GroupBox x:Name="gbxProgress" Header="Progress" HorizontalAlignment="Left" Margin="298,105,0,0" VerticalAlignment="Top" Height="445" Width="462" Foreground="Black">
<ListBox x:Name="lbxProgress" HorizontalAlignment="Left" Height="408" Margin="10,10,0,0" VerticalAlignment="Top" Width="431" Foreground="Black" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Progress.Message}" />
</GroupBox>
<Button x:Name="btnStart" Content="Start" HorizontalAlignment="Left" Margin="20,513,0,0" VerticalAlignment="Top" Width="100" Height="37" IsEnabled="{Binding Properties.StartButtonEnabled}" Click="btnStart_Click"/>
<Button x:Name="btnCancel" Content="Cancel" HorizontalAlignment="Left" Margin="177,513,0,0" VerticalAlignment="Top" Width="100" Height="37"/>
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="70" Margin="20,21,0,0" VerticalAlignment="Top" Width="740" CornerRadius="15">
<Grid>
<Image HorizontalAlignment ="Left" Margin="10" Height="50" Width="50" VerticalAlignment="Center" Source="/Lib/Icons/User.png" />
<TextBlock Name="txtUser" FontSize="20" Height="30" Width="200" Foreground="Red" HorizontalAlignment="Left" Margin="78,19,0,19"/>
<Image HorizontalAlignment ="Left" Margin="443,8,0,10" Height="50" Width="50" VerticalAlignment="Center" Source="Lib/Icons/Watch.png" />
<TextBlock x:Name="txtRunTime" FontSize="20" Height="30" Width="200" Foreground="Red" HorizontalAlignment="Left" Margin="519,19,0,19" Text="{Binding AppRunTime.TimeElapsed}" />
</Grid>
</Border>
<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="144" Margin="20,119,0,0" VerticalAlignment="Top" Width="257" CornerRadius="15">
<Grid>
<Label x:Name="lblProcessSelection" Content="Process Selection" HorizontalAlignment="Center" VerticalAlignment="Top" Width="257" HorizontalContentAlignment="Center"/>
<ListView x:Name="lvProcessSelection" HorizontalAlignment="Left" Height="93" Margin="10,30,0,0" VerticalAlignment="Top" Width="235" BorderThickness="0" SelectionChanged="lvProcessSelection_SelectionChanged">
<ListViewItem Name="itmERA" Content="Expense Reserve Automation"/>
<ListViewItem Name="itmFCS" Content="Financial Close Status"/>
<ListViewItem Name="itmPEL" Content="Peel"/>
</ListView>
</Grid>
</Border>
<ContentControl DataContext="{Binding Properties}" Content="{Binding}">
<ContentControl.Style>
<Style TargetType="ContentControl">
<Setter Property="ContentTemplate" Value="{StaticResource ERAFileSelect}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding SelectedProcess}" Value="Expense Reserve Automation">
<Setter Property="ContentTemplate" Value="{StaticResource ERAFileSelect}" />
</DataTrigger>
<DataTrigger Binding="{Binding SelectedProcess}" Value="Financial Close Status">
<Setter Property="ContentTemplate" Value="{StaticResource FCSFileSelect}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</Grid>
ViewModel 代码为
public class MainWindowModel
{
public ApplicationRunTime AppRunTime { get; set; }
public LogMessage Progress { get; set; }
public MainWindowProperties Properties { get; set; }
public MainWindowModel()
{
AppRunTime = new ApplicationRunTime();
Progress = new LogMessage();
Properties = new MainWindowProperties();
Properties.StartButtonEnabled = false;
}
}
具有主要Window属性class
public class MainWindowProperties
{
public bool StartButtonEnabled { get; set; }
public string SelectedProcess { get; set; }
}
在我的 MainWindow 构造函数中，我设置了 DataContext
mainWindowModel = new MainWindowModel();
this.DataContext = mainWindowModel;
当 lvProcessSelection 中的选择发生变化时，将执行以下代码
if (lvProcessSelection.SelectedItems.Count > 0)
{
mainWindowModel.Properties.SelectedProcess = ((ListViewItem)lvProcessSelection.SelectedItem).Content.ToString();
}
else
{
mainWindowModel.Properties.SelectedProcess = string.Empty;
}
这将使用 "Expense Reserve Automation" 或 "Financial Close Status"
更新我的 ViewModel 中的 SelectedProcess我知道我的 ViewModel 的 DataContext 设置正确（但可能不适用于 ContentControl），因为我能够使用新消息更新 lbxProgress 并使用应用程序 RunTime 更新 txtRunTime
然而，当我更改 lvProcessSelection 上的选择时，没有任何反应； ERAFileSelect 的默认控件保留。
任何人都可以指出正确的方向来解决这个问题吗？
为什么不使用数据模板？数据模板将在这种情况下工作。
Could anybody point me in the right direction on how to solve this?
您的 MainWindowProperties class 应该实现 INotifyPropertyChanged 接口并在 SelectedProcess 属性 设置为新值时发出更改通知：
public class MainWindowProperties : INotifyPropertyChanged
{
public bool StartButtonEnabled { get; set; }
private string _selectedProcess;
public string SelectedProcess
{
get { return _selectedProcess; }
set { _selectedProcess = value; NotifyPropertyChanged(); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
请参阅 MSDN 以获取有关此公共接口的更多信息：https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx
您绑定到的每个视图 model/model 都必须实现此接口并为要更新的视图中的任何目标值发出更改通知。