Question

我知道有很多关于此的问题，我确保已经尝试了每一个答案。我对WPF没有太多经验，我的团队也没有其他人，所以我确信我犯了一个愚蠢的错误，看不到它。我一直在为我接管的这个项目添加一个新功能，并且已经将意大利面条代码转换为MVVM解决方案的开头。我有一个模型，它源自XML文档的DeSerialization和ViewModel。它们目前都有UserControl所需的数据。所以我将DataContext设置为Code Behind。在此，MsClassification最初设置为“UN”。我将组合框更改为其他内容，并使用按钮重新读取XML，将MsClassification设置回“UN”，但View不会更新。有趣的是，如果我将MsLoggingLevel设置为其他内容，并重新读取XML，它将更新两个值。

XAML：

<TabItem Header="Init" HorizontalAlignment="Left" Height="25" VerticalAlignment="Top" Width="78" Margin="0" ClipToBounds="True">
            <Grid Background="#FFE5E5E5" ClipToBounds="True">
                <TreeView x:Name="AssessorToolWindow_InitTree" Margin="0" BorderThickness="0" ClipToBounds="True" DataContext="{Binding Path=VSParentReference.InitRules.Init}">
                    <TreeViewItem  Header="Excluded Files" ItemsSource="{Binding Path=MsExcludedFiles}">
                        <TreeViewItem.ItemTemplate>
                            <DataTemplate>
                                <TreeViewItem Header ="{Binding}"/>
                            </DataTemplate>
                        </TreeViewItem.ItemTemplate>
                    </TreeViewItem>
                    <TreeViewItem Header="Included Files" ItemsSource="{Binding Path=MsIncludedFiles, Mode=TwoWay}">
                        <TreeViewItem.ItemTemplate>
                            <DataTemplate>
                                <TreeViewItem Header="{Binding}"/>
                            </DataTemplate>
                        </TreeViewItem.ItemTemplate>
                    </TreeViewItem>
                    <TreeViewItem Header="Project Path">
                        <TreeViewItem Header="{Binding Path=MsRootProjectDirectory, Mode=TwoWay}"/>
                    </TreeViewItem>
                    <TreeViewItem Header="Classification">
                        <ComboBox 
                            ItemsSource="{Binding Path=ClassificationLevels}"
                            SelectedValue="{Binding Path=MsClassification}"
                            IsSynchronizedWithCurrentItem="True" />
                    </TreeViewItem>
                    <TreeViewItem Header="Log Level">
                        <ComboBox 
                            ItemsSource="{Binding Path=LoggerLevels}"
                            SelectedItem="{Binding Path=MsLogLevel}"
                            IsSynchronizedWithCurrentItem="True"
                            />
                    </TreeViewItem> 
                </TreeView>
            </Grid>
        </TabItem>

代码隐藏：

        [XmlArrayItem("EXC"),
    XmlArray("ExcludedFiles")]
    public ObservableCollection<string> MsExcludedFiles
    {
        get
        {
            return _msExcludedFiles;

        }
        set
        {
            if (value != _msExcludedFiles)
            {
                _msExcludedFiles = value;
                NotifyPropertyChanged("MsExcludedFiles");
            }

        }
    }

    [XmlArrayItem("INC"),
    XmlArray("IncludedFiles")]
    public ObservableCollection<string> MsIncludedFiles
    {
        get
        {
            return _msIncludedFiles;
        }
        set
        {
            if (value != _msIncludedFiles)
            {
                _msIncludedFiles = value;
                NotifyPropertyChanged("MsIncludedFiles");
            }
        }
    }

    [XmlElement(ElementName = "ProjectPath")]
    public string MsRootProjectDirectory
    {
        get
        {
            return _msRootProjectDirectory;
        }
        set
        {
            if (value != _msRootProjectDirectory)
            {
                _msRootProjectDirectory = value;
                NotifyPropertyChanged("MsRootProjectDirectory");
            }
        }
    }

    [XmlElement(ElementName = "LogLevel")]
    public string MsLogLevel
    {
        get { return _msLogLevel; }
        set 
        {
            if (value != _msLogLevel)
            {
                _msLogLevel = value;
                NotifyPropertyChanged("MsLogLevel");
            }      
        }
    }


    [XmlElement(ElementName = "Classification")]
    public String MsClassification
    {
        get
        {
            return classification;
        }
        set
        {
            if (value != classification)
            {
                classification = value;
                NotifyPropertyChanged("MsClassification");
            }
        }
    }
    protected virtual void NotifyPropertyChanged(string p)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
            handler(this, new PropertyChangedEventArgs(p));
    }

Answer 1

确保在ViewModel中实现INotifyPropertyChanged，并将绑定设置为TwoWay

{Binding Path=ClassificationLevels, Mode=TwoWay}

还有一件事，...尝试使用Fody。它将为您节省大量时间尝试使用WPF Inspector。它为您提供了更多调试绑定和更新的选项。您可以更详细地检查应用程序。

WPF绑定不更新一个属性

1 个答案: