此类(如下所示)是自定义组件。它应该只需通过点击扩展器内的列表来搜索文件夹。
ExpanderList是扩展器中的列表
DirMaker是实际扩展器
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
namespace BigHand
{
/// <summary>
/// Interaction logic for DirMakerControl.xaml
/// </summary>
public partial class DirMakerControl : UserControl
{
string currentDirectory = "c:/";
DirectoryInfo di;
bool directoryEmpty;
public DirMakerControl()
{
this.InitializeComponent();
getFolders();
updateHeader();
}
private void getFolders()
{
ExpanderList.Items.Clear();
try
{
di = new DirectoryInfo(currentDirectory);
foreach (DirectoryInfo d in di.GetDirectories())
{
ExpanderList.Items.Add(d.ToString());
}
}
catch (UnauthorizedAccessException)
{
//goBack() keeps display the same
goBack();
MessageBox.Show(" SORRY!!!! \nYou dont have the correct \npermisions to use these files.");
}
if (ExpanderList.Items.Count == 0)
{
directoryEmpty = true;
ExpanderList.IsEnabled = false;
ExpanderList.Items.Add("No Folders Here");
}
else
{
directoryEmpty = false;
ExpanderList.IsEnabled = true;
}
updateHeader();
}
private void ListClicked(object sender, SelectionChangedEventArgs e)
{
// If selected index is -1 (no selection) do nothing
if (ExpanderList.SelectedIndex != -1)
{
//update list and variables
if (!directoryEmpty)
{
ExpanderList.IsEnabled = true;
currentDirectory = currentDirectory + ExpanderList.SelectedItem + "/";
// Reset selected index to -1 (no selection)
ExpanderList.SelectedIndex = -1;
getFolders();
}
}
}
private void goBack()
{
currentDirectory = currentDirectory.Substring(0, getCurrentFolderStringIndex());
getFolders();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
goBack();
}
//returns an integer representing where the current folder name starts in the current folder string
public int getCurrentFolderStringIndex()
{
char[] currentD = currentDirectory.ToCharArray();
for (int index = currentD.Length - 2; index >= 0; index--)
{
if (currentD[index] == '/')
{
return index + 1;
}
}
//if this gets called(should at least start back at the c:/)
return 0;
}
private void updateHeader()
{
//Change Header
//get temp int to save calling the method twice
int index = getCurrentFolderStringIndex();
if (index == 0)
DirMaker.Header = currentDirectory;
else
DirMaker.Header = currentDirectory.Substring(index, currentDirectory.Length - index);
}
private void selectionMade(ListBox sender, System.Windows.Input.MouseButtonEventArgs e)
{
// TODO: Add event handler implementation here.
// If selected index is -1 (no selection) do nothing
if (ExpanderList.SelectedIndex == -1)
return;
//update list and variables
if (!directoryEmpty)
{
ExpanderList.IsEnabled = true;
currentDirectory = currentDirectory + ExpanderList.SelectedItem + "/";
// Reset selected index to -1 (no selection)
ExpanderList.SelectedIndex = -1;
getFolders();
}
}
}
}
它的效果非常好,除了私有的void ListClicked(对象发送者,SelectionChangedEventArgs e) 有时会触发更多一次,其效果是跳过更深的文件,然后按照预期的一个级别。当我在if上放置一个断点时,这种行为似乎没有重复 (ExpanderList.SelectedIndex!= -1)总是返回-1的行,如果不应该发生则阻止它。我已经看到有证据表明这种方法有一个错误吗?虽然我没有经验或前面指责别人.....它绝对是我虽然这个选项一直在我心中玩,因为我不能找到重复射击的原因。
真的至关重要,因为它让我疯狂
提前感谢您的任何帮助
约翰哈里斯答案 0 :(得分:0)
直接使用 ListBox.Items 属性不是一个好主意:您应首先在临时集合中运行文件夹检索,这是一个简单的List&lt; string&gt; ,一旦完成,您将更新ListBox 批量:
ExpanderList.Items.Clear();
foreach (string s in tmp)
{
ExpanderList.Items.Add(s);
}
至少这将是更优化,但检查是否也解决了您的问题。 :)