C# WPF TreeView ObservableCollection通知示例代码
我正试图编写一个C#WPF应用程序,我被TreeView和ObservableCollection所困扰 这是我的TreeView项目C# WPF TreeView ObservableCollection通知示例代码,c#,wpf,treeview,observablecollection,C#,Wpf,Treeview,Observablecollection,我正试图编写一个C#WPF应用程序,我被TreeView和ObservableCollection所困扰 这是我的TreeView项目 | Root --- SubItem ------ SubItem | Root --- SubItem ------ SubItem ---------- SubItem 我正在从其他窗口修改此项目,我需要在不重新加载所有项目的情况下更新此树视图。我已经搜索过了,发现了一个明显的集合。但我不明白如何使用ObservableCollection、通知更改和更新
| Root
--- SubItem
------ SubItem
| Root
--- SubItem
------ SubItem
---------- SubItem
我正在从其他窗口修改此项目,我需要在不重新加载所有项目的情况下更新此树视图。我已经搜索过了,发现了一个明显的集合。但我不明白如何使用ObservableCollection、通知更改和更新此列表。
您能给我一些示例代码或帮助我完成这项工作吗?这里是一个很好的实现示例 这只是另一个样本 您的型号:
public interface IFolder
{
string FullPath { get; }
string FolderLabel { get; }
ObservableCollection<IFolder> Folders { get; }
}
公共接口IFolder
{
字符串完整路径{get;}
字符串FolderLabel{get;}
ObservableCollection文件夹{get;}
}
您的ViewModel:
class ViewModel : INotifyPropertyChanged
{
public ViewModel()
{
m_folders = new ObservableCollection<IFolder>();
//add Root items
Folders.Add(new Folder { FolderLabel = "Dummy1", FullPath = @"C:\dummy1" });
Folders.Add(new Folder { FolderLabel = "Dummy2", FullPath = @"C:\dummy2" });
Folders.Add(new Folder { FolderLabel = "Dummy3", FullPath = @"C:\dummy3" });
Folders.Add(new Folder { FolderLabel = "Dummy4", FullPath = @"C:\dummy4" });
//add sub items
Folders[0].Folders.Add(new Folder { FolderLabel = "Dummy11", FullPath = @"C:\dummy11" });
Folders[0].Folders.Add(new Folder { FolderLabel = "Dummy12", FullPath = @"C:\dummy12" });
Folders[0].Folders.Add(new Folder { FolderLabel = "Dummy13", FullPath = @"C:\dummy13" });
Folders[0].Folders.Add(new Folder { FolderLabel = "Dummy14", FullPath = @"C:\dummy14" });
}
public string TEST { get; set; }
private ObservableCollection<IFolder> m_folders;
public ObservableCollection<IFolder> Folders
{
get { return m_folders; }
set
{
m_folders = value;
NotifiyPropertyChanged("Folders");
}
}
void NotifiyPropertyChanged(string property)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
public event PropertyChangedEventHandler PropertyChanged;
}
类视图模型:INotifyPropertyChanged
{
公共视图模型()
{
m_folders=新的ObservableCollection();
//添加根项目
添加(新文件夹{FolderLabel=“Dummy1”,FullPath=@“C:\Dummy1”});
添加(新文件夹{FolderLabel=“Dummy2”,FullPath=@“C:\Dummy2”});
添加(新文件夹{FolderLabel=“Dummy3”,FullPath=@“C:\Dummy3”});
添加(新文件夹{FolderLabel=“Dummy4”,FullPath=@“C:\Dummy4”});
//添加子项
文件夹[0]。文件夹。添加(新文件夹{FolderLabel=“Dummy11”,FullPath=@“C:\Dummy11”});
文件夹[0]。文件夹。添加(新文件夹{FolderLabel=“Dummy12”,FullPath=@“C:\Dummy12”});
文件夹[0]。文件夹。添加(新文件夹{FolderLabel=“Dummy13”,FullPath=@“C:\Dummy13”});
文件夹[0]。文件夹。添加(新文件夹{FolderLabel=“Dummy14”,FullPath=@“C:\Dummy14”});
}
公共字符串测试{get;set;}
私有可观察收集m_文件夹;
公共可观测集合文件夹
{
获取{返回m_文件夹;}
设置
{
m_=值;
通知财产变更(“文件夹”);
}
}
作废NotifiyPropertyChanged(字符串属性)
{
if(PropertyChanged!=null)
PropertyChanged(此,新PropertyChangedEventArgs(property));
}
公共事件属性更改事件处理程序属性更改;
}
在xaml中:
<TextBlock Text="Simple root binding" Foreground="Red" Margin="10,10,0,0" />
<TreeView ItemsSource="{Binding Folders}" Margin="10">
<TreeView.ItemTemplate>
<DataTemplate>
<TreeViewItem Header="{Binding FolderLabel}"/>
</DataTemplate>
</TreeView.ItemTemplate>
</TreeView>