C# TreeView';的子节点无法反映绑定中的更改
只有顶级节点可以反映后面的更改,但它们的节点不能。有什么想法吗?谢谢在下面的代码中,它应该同时添加一个新经理和一个新员工 模型C# TreeView';的子节点无法反映绑定中的更改,c#,wpf,mvvm,binding,treeview,C#,Wpf,Mvvm,Binding,Treeview,只有顶级节点可以反映后面的更改,但它们的节点不能。有什么想法吗?谢谢在下面的代码中,它应该同时添加一个新经理和一个新员工 模型 公共类员工 { 公共Guid EmployeeId{get;set;} 公共字符串EmployeeName{get;set;} } 公共班级经理 { 公共Guid ManagerId{get;set;} 公共字符串管理器名称{get;set;} 公共IEnumerable雇员{get;set;} } 视图模型 公共类TreeWindowViewModel:INoti
公共类员工
{
公共Guid EmployeeId{get;set;}
公共字符串EmployeeName{get;set;}
}
公共班级经理
{
公共Guid ManagerId{get;set;}
公共字符串管理器名称{get;set;}
公共IEnumerable雇员{get;set;}
}
视图模型
公共类TreeWindowViewModel:INotifyPropertyChanged
{
私有列表employeeList=新列表();
私有列表管理器列表=新列表();
公共树WindowViewModel()
{
//创建用于测试的假数据
添加(新员工(){EmployeeId=Guid.NewGuid(),EmployeeName=“Adam”});
添加(新员工(){EmployeeId=Guid.NewGuid(),EmployeeName=“Benson”});
添加(新员工(){EmployeeId=Guid.NewGuid(),EmployeeName=“cooster”});
添加(新员工(){EmployeeId=Guid.NewGuid(),EmployeeName=“Denny”});
添加(新员工(){EmployeeId=Guid.NewGuid(),EmployeeName=“Ellis”});
//创建ObservableCollection对象
员工=新的可观察集合(员工列表);
//创建2个经理,并使
经理manager1=新经理()
{
ManagerId=Guid.NewGuid(),
ManagerName=“弗兰克”,
员工=新列表(员工列表)
};
经理2=新经理()
{
ManagerId=Guid.NewGuid(),
ManagerName=“绿色”,
员工=新列表(员工列表)
};
managerList.Add(manager1);
managerList.Add(manager2);
经理=新的可观察集合(经理列表);
}
私人收款经理;
公共收款经理
{
得到
{
回报经理;
}
设置
{
经理=价值;
OnPropertyChanged(新PropertyChangedEventArgs(“经理”);
}
}
私人收集员工;
公开收集雇员
{
得到
{
返回员工;
}
设置
{
员工=价值;
OnPropertyChanged(新PropertyChangedEventArgs(“员工”));
}
}
公共事件属性更改事件处理程序属性更改;
PropertyChanged上的公共无效(PropertyChangedEventArgs e)
{
if(PropertyChanged!=null)
{
财产变更(本,e);
}
}
}
XAML
XAML.CS
命名空间绑定测试
{
///
///TreeWindow.xaml的交互逻辑
///
公共部分类树窗口:窗口
{
公共树丛()
{
初始化组件();
this.DataContext=newtreewindowviewmodel();
}
私有无效按钮\u单击(对象发送者,路由目标e)
{
TreeWindowViewModel ds=this.DataContext作为TreeWindowViewModel;
如果(ds!=null)
{
添加(new Manager(){ManagerId=Guid.NewGuid(),ManagerName=“new Manager”});
添加(new Employee(){EmployeeId=Guid.NewGuid(),EmployeeName=“new Employee”});
}
}
}
}
无法获得预期结果的主要原因是,您正在将
员工
添加到公共可观察集合员工
,而用户界面上没有该限制。您真正看到的是绑定到TreeView
的经理的初始列表。
public class Employee
{
public Guid EmployeeId { get; set; }
public string EmployeeName { get; set; }
}
public class Manager
{
public Guid ManagerId { get; set; }
public string ManagerName { get; set; }
public IEnumerable<Employee> Employees { get; set; }
}
public class TreeWindowViewModel : INotifyPropertyChanged
{
private List<Employee> employeeList = new List<Employee>();
private List<Manager> managerList = new List<Manager>();
public TreeWindowViewModel()
{
//Create fake data for testing
employeeList.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "Adam" });
employeeList.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "Benson" });
employeeList.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "Cooker" });
employeeList.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "Denny" });
employeeList.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "Ellis" });
//Create ObservableCollection object
employees = new ObservableCollection<Employee>(employeeList);
//Create 2 managers and make
Manager manager1 = new Manager()
{
ManagerId = Guid.NewGuid(),
ManagerName = "Frank",
Employees = new List<Employee>(employeeList)
};
Manager manager2 = new Manager()
{
ManagerId = Guid.NewGuid(),
ManagerName = "Green",
Employees = new List<Employee>(employeeList)
};
managerList.Add(manager1);
managerList.Add(manager2);
managers = new ObservableCollection<Manager>(managerList);
}
private ObservableCollection<Manager> managers;
public ObservableCollection<Manager> Managers
{
get
{
return managers;
}
set
{
managers = value;
OnPropertyChanged(new PropertyChangedEventArgs("Managers"));
}
}
private ObservableCollection<Employee> employees;
public ObservableCollection<Employee> Employees
{
get
{
return employees;
}
set
{
employees = value;
OnPropertyChanged(new PropertyChangedEventArgs("Employees"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (PropertyChanged != null)
{
PropertyChanged(this, e);
}
}
}
<Window x:Class="BindingTests.TreeWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:m="clr-namespace:BindingTests.Models"
Title="TreeWindow" Height="300" Width="300">
<Window.Resources>
<HierarchicalDataTemplate ItemsSource="{Binding Path=Employees}" DataType="{x:Type m:Manager}">
<TextBlock Text="{Binding Path=ManagerName}"/>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type m:Employee}">
<TextBlock Text="{Binding Path=EmployeeName}"/>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TreeView ItemsSource="{Binding Managers, Mode=OneWay, NotifyOnSourceUpdated=True}" Grid.Column="0">
<TreeView.Resources>
<Style TargetType="Label">
<Setter Property="Margin" Value="0"/>
<Setter Property="Padding" Value="0"/>
</Style>
<Style TargetType="TreeViewItem">
<Setter Property="Margin" Value="0"/>
<Setter Property="Padding" Value="0"/>
</Style>
</TreeView.Resources>
</TreeView>
<StackPanel Grid.Column="1">
<Button Content="Click me to add a manager" Click="Button_Click" Height="30"/>
</StackPanel>
</Grid>
</Window>
namespace BindingTests
{
/// <summary>
/// Interaction logic for TreeWindow.xaml
/// </summary>
public partial class TreeWindow : Window
{
public TreeWindow()
{
InitializeComponent();
this.DataContext = new TreeWindowViewModel();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
TreeWindowViewModel ds = this.DataContext as TreeWindowViewModel;
if (ds != null)
{
ds.Managers.Add(new Manager() { ManagerId = Guid.NewGuid(), ManagerName = "New Manager" });
ds.Employees.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "New Employee"});
}
}
}
}
if (ds != null)
{
ds.Managers.Add(new Manager() { ManagerId = Guid.NewGuid(), ManagerName = "New Manager" });
ds.Managers[0].Employees.Add(new Employee() { EmployeeId = Guid.NewGuid(), EmployeeName = "New Employee"});
}
if(ds.SelectedItem is Manager)
{
(ds.SelectedItem as Manager).Employees.Add( ... );
}