尝试浏览我的文件和我的驱动器文件夹时出错

Question

我正在尝试浏览我的文件和我的驱动器的文件夹但是我得到 error.I 已经写了一个方法来获取我的驱动器详细信息，然后是一个方法来获取我的驱动器的详细信息（即文件和文件夹)

DirectoryList 的集合属性处出错：异常抛出了“System.WhosebugException”类型的。

这是我的代码：

public class FilePath
    {
        public string  FileName { get; set; }

        public string inputFilePath { get; set; }

    }

public class OpenDataViewModel : BindableBase {

    public OpenDataViewModel()
    {
        ListDrives();            
    }

    private FilePath _selecteddirectory;
    public FilePath SelectedDirectory
    {
        get { return _selecteddirectory; }
        set
        {
            SetProperty(ref _selecteddirectory, value);
            ListDirectoryContent(_selecteddirectory);
        }
    }

    public List<FilePath> _directoryList;
    public List<FilePath> DirectoryList
    {
        get { return _directoryList; }
        set { SetProperty(ref _directoryList, value); }
    }



    private List<FilePath> _fileList;
    public List<FilePath> FileList
    {
        get { return _fileList; }
        set { SetProperty(ref _fileList, value); }
    }

    public void ListDrives()
    {


        DirectoryList = new List<FilePath>();


        foreach (var drive in Directory.GetLogicalDrives())
        {
            DirectoryList.Add(new FilePath()
            {
                
                FileName = drive.Remove(1, drive.LastIndexOf('\') ) ,

                inputFilePath = Convert.ToString(drive)
            }); 
        }
      
    }

    public void ListDirectoryContent(FilePath inputPath)
    {
        
        
            DirectoryList = new List<FilePath>();


        foreach (var directory in Directory.GetDirectories(inputPath.inputFilePath))
        {
            DirectoryList.Add(new FilePath()
            {

                FileName = directory.Remove(0,3),

                inputFilePath = Convert.ToString(directory)
            });

        }

       
        
        FileList = new List<FilePath>();


        foreach (var fileData in Directory.GetFiles(inputPath.inputFilePath))
        {
            FileList.Add(new FilePath()
            {

                FileName = fileData.Remove(0, 3),

                inputFilePath = Convert.ToString(fileData)
            }) ;
        }           
    }

这是我的 Xmal：

 <ListView ItemsSource="{Binding DirectoryList}" Grid.Row="2" Grid.Column="0" Background="Aqua" SelectedValue="{Binding SelectedDirectory}" >
                <ListView.View>
                    <GridView>
                        <GridViewColumn DisplayMemberBinding="{Binding FileName}" Header="Folder" Width="250" ></GridViewColumn>
                    </GridView>
                </ListView.View>
            </ListView>

Answer 1

当设置 SelectedDirectory 时，您会更新 DirectoryList，这反过来会导致 ListView 更新 SelectedDirectory，因此您的 WhosebugException。

你至少要改变的事情：

仅当所选目录实际更改时才更新DirectoryList
使指向同一文件的 FilePath 个实例相等

广告 1：

public FilePath SelectedDirectory
{
    get => _selecteddirectory;
    set
    {
        if (SetProperty(ref _selecteddirectory, value))
            ListDirectoryContent(_selecteddirectory);
    }
}

广告 2：

实施 operator== 和 Equals 并使其成为 readonly struct 而不是 class.

尝试浏览我的文件和我的驱动器文件夹时出错

Error when trying to explore my files and Folder of my Drive

prism