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我正在尝试根据用户选择的 listviewitem 更新主窗口上的控件，但是当 listviewitem 选择发生更改时，控件不会更新。

我使用这篇文章作为参考如何使用复选框动态更改 WPF 控件的模板？

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

我的主窗口的 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 代码是

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;
    }
}

使用 MainWindowProperties 类

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 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“费用储备自动化”或“财务关闭状态”更新我的 ViewModel 中的 SelectedProcess

我知道我的 ViewModel 的 DataContext 设置正确（但可能不是 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

但是，当我更改 lvProcessSelection 上的选择时，什么也没有发生；ERAFileSelect 的默认控件仍然存在。

有人能指出我如何解决这个问题的正确方向吗？

4

2 回答 2

2

有人能指出我如何解决这个问题的正确方向吗？

您的 MainWindowProperties 类应实现 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));
    }
}

有关此通用接口的更多信息，请参阅 MSDN：https ://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx

您绑定到的每个视图模型/模型都必须实现此接口并针对要更新的视图中的任何目标值发出更改通知。

于 2016-12-15T15:52:51.383 回答
1

为什么你不使用数据模板？数据模板将在这种情况下工作。

于 2016-12-15T15:03:23.530 回答