Question

我正在构建文件资源管理器，当用户使用TreeView触发此事件时。其中填充绑定到名为ObservableCollection<T>的ListView的File_List .FillCollection方法确实用正确的信息填充FileList。

我已经将这个从填充c＃更改为绑定，因为我认为它更容易维护。谢谢你的时间。有this告诉我使用INotifyPropertyChanged方法进行刺穿RaisedPropertyChanged。

private void folderItems_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    try
    {

        TreeViewItem item = (TreeViewItem)folderItems.SelectedItem;
        FileAttributes attr = File.GetAttributes(item.Tag.ToString());
        if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
        {
            _ViewModel.FileList = FillFileModel.FillCollection(item.Tag.ToString());
        }
        else
        {
           //Do something else
        }

    }
    catch (Exception) { }
}

FillFileModel类

public static ObservableCollection<Files> FillCollection(string Path)
{
    ObservableCollection<Files> files = new ObservableCollection<Files>();

    var searchDirectory = new DirectoryInfo(Path);
    try
    {
        Files getFile;
        foreach (var file in searchDirectory.GetFiles())
        {
            getFile = new Files
            {
                FileName = file.Name,
                FileSize = file.Length.ToString("#,##0 KB"),
                DateModified = file.LastWriteTime,
                FileType = getFileType(file.FullName)
            };

            files.Add(getFile);
        }
    }
    catch (Exception)
    {
    }
    return files;
}

绑定属性：

public ObservableCollection<Files> FileList
{
    get { return _FileList; }
    set
    {
        if (_FileList!=value)
        {
            _FileList = value;
            RaisedPropertyChanged("FileList");
        }
    }
}

RaisedPropertyChanged

public event PropertyChangedEventHandler PropertyChanged;

protected void RaisedPropertyChanged(string propertyName)
{
    PropertyChangedEventHandler handler = this.PropertyChanged;
    if (handler != null)
    {
        PropertyChangedEventArgs args = new PropertyChangedEventArgs(propertyName);
        handler(this, args);
    }
}


**XAML:**
<Window.Resources>
    <uc:ucNav x:Key="Nav"/>        
    <uc:FileExplorerViewModel x:Key="viewModel"/>
    <local:FileImageConverter x:Key="ImageConverter"/>
</Window.Resources>

 <ListView Width="580" Margin="205,32,9,10" x:Name="File_List" ItemsSource="{Binding Path=FileList}">
    <ListView.View>
        <GridView>
            <GridViewColumn Width="150" Header="Name" >
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <Image Source="{Binding Converter={StaticResource ImageConverter}}" Height="20" Width="20" Stretch="Fill"/>
                            <TextBlock x:Name="file_Name" Text="{Binding FileName}"/>
                        </StackPanel>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Width="150">
                <GridViewColumnHeader>
                    <TextBlock Text="Date Modified" />
                </GridViewColumnHeader>
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock x:Name="Date_Modified"  Text="{Binding DateModified}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Width="150">
                <GridViewColumnHeader>
                    <TextBlock Text="File Type" />
                </GridViewColumnHeader>
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock x:Name="File_Type" Text="{Binding FileType}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Width="130">
                <GridViewColumnHeader>
                    <TextBlock Text="File Size" />
                </GridViewColumnHeader>
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock x:Name="File_Size" Text="{Binding FileSize}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>

        </GridView>
    </ListView.View>
</ListView>

Answer 1

听起来您的DataContext设置不正确，因为您发布的其他代码看起来是正确的。

在点击处理程序中放置一个断点，然后仔细检查File_List.DataContext == _ViewModel

DataContext通常从父控件继承，或者如果这是最顶层的窗口，则可以从代码隐藏中设置它。在极少数情况下，您也可以绑定或设置值，但通常不建议这样做，因为它可能会导致混淆和调试问题。

绑定到ObservableCollection的ListView <t>添加到属性时不更新

1 个答案: