我在数据绑定方面遇到了一些问题......以下是这种情况：
我的观点：
<Window x:Class="Shifter.Forms.Employee.frmEditEmployee"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="frmEditEmployee" Height="350.141" Width="497.195" WindowStyle="None" ResizeMode="NoResize" Foreground="Blue" WindowStartupLocation="CenterScreen">
<Grid>
<ListBox x:Name="lstEmployee" IsEnabled="{Binding NoEditMode}" SelectedItem="{Binding MasterEmployee}" ItemsSource="{Binding Path=ListOfEmployees}" HorizontalAlignment="Left" Height="276" Margin="25,19,0,0" VerticalAlignment="Top" Width="217" />
<TextBox x:Name="txtForename" Text="{Binding SelectedItem.Forname, ElementName=lstEmployee}" Margin="342,21,0,0" GotFocus="SelectText"/>
<TextBox x:Name="txtLastname" Text="{Binding SelectedItem.Lastname, ElementName=lstEmployee}" Margin="342,47,0,0" GotFocus="SelectText"/>
<TextBox x:Name="txtShowingname" Text="{Binding SelectedItem.Showingname, ElementName=lstEmployee}" Margin="342,74,0,0" GotFocus="SelectText"/>
<TextBox x:Name="txtPersonelNumber" Text="{Binding SelectedItem.EmployeeID, ElementName=lstEmployee}" Margin="342,99,0,0" GotFocus="SelectText"/>
<DatePicker x:Name="dtpBirthday" SelectedDate="{Binding SelectedItem.Birthday, ElementName=lstEmployee}" HorizontalAlignment="Left" Margin="342,125,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.256,0.417" SelectedDateFormat="Short"/>
<TextBox x:Name="txtLoan" Text="{Binding SelectedItem.Loan, ElementName=lstEmployee}" Margin="342,151,0,0" TextWrapping="Wrap" GotFocus="SelectText"/>
<TextBox x:Name="txtPhone" Text="{Binding SelectedItem.Telephone, ElementName=lstEmployee}" Margin="342,229,0,0" TextWrapping="Wrap" GotFocus="SelectText"/>
<TextBox x:Name="txtEMail" Text="{Binding SelectedItem.EMail, ElementName=lstEmployee}" Margin="342,255,0,0" TextWrapping="Wrap" GotFocus="SelectText"/>
<ComboBox x:Name="cmbContract" ItemsSource="{Binding ListOfContracts, Mode=TwoWay}" SelectedItem="{Binding SelectedItem.Contract, ElementName=lstEmployee, Mode=TwoWay}" HorizontalAlignment="Left" Margin="342,179,0,0" VerticalAlignment="Top" Width="130"/>
<ComboBox x:Name="cmbGroup" ItemsSource="{Binding ListOfGroups, Mode=TwoWay}" SelectedItem="{Binding SelectedItem.Group, ElementName=lstEmployee, Mode=TwoWay}" HorizontalAlignment="Left" Margin="342,204,0,0" VerticalAlignment="Top" Width="130"/>
<CheckBox x:Name="chkHide" Content="MA im Dienstplan ausblenden" IsChecked="{Binding SelectedItem.isHiding, ElementName=lstEmployee}" HorizontalAlignment="Left" Margin="259,280,0,0" VerticalAlignment="Top" ToolTip="Der Mitarbeiter wird nicht im Dienstplan angezeigt (beispielsweise wegen längerer Abwesenheit)" Width="211"/>
<Button x:Name="btnAdd" Content="Add" Command="{Binding Path=cmdAdd, Mode=TwoWay}" HorizontalAlignment="Left" Height="35" Margin="25,303,0,0" VerticalAlignment="Top" Width="35">
</Button>
<Button x:Name="btnEdit" Content="Edit" Command="{Binding Path=cmdEdit}" HorizontalAlignment="Left" Height="35" Margin="70,303,0,0" VerticalAlignment="Top" Width="35">
</Button>
<Button x:Name="btnDelete" Content="Delete" Command="{Binding Path=cmdDelete}" HorizontalAlignment="Left" Height="35" Margin="115,303,0,0" VerticalAlignment="Top" Width="35">
</Button>
<Button x:Name="btnCancel" Content="Cancel" Command="{Binding Path=cmdCancel}" HorizontalAlignment="Left" Height="35" Margin="391,303,0,0" VerticalAlignment="Top" Width="35">
</Button>
<Button x:Name="btnOK" Content="OK" Command="{Binding Path=cmdOK}" HorizontalAlignment="Left" Height="35" Margin="436,303,0,0" VerticalAlignment="Top" Width="35">
</Button>
</Grid>
</Window>
我的ViewModel：
namespace Models
{
public class VM_EditEmployee : INotifyPropertyChanged
{
#region Propertys
private ObservableCollection<Common.Employee> mListOfEmployees;
private ObservableCollection<Common.EmployeeContract> mListOfContracts;
private ObservableCollection<Common.EmployeeGroup> mListOfGroups;
private Common.Employee mMasterEmployee;
private bool isNew;
private Employee.frmEditEmployee EmpoyeeView;
public event PropertyChangedEventHandler PropertyChanged;
public ObservableCollection<Common.Employee> ListOfEmployees
{
get
{
return mListOfEmployees;
}
set
{
mListOfEmployees = value;
OnPropertyChanged("ListOfEmployees");
}
}
public ObservableCollection<EmployeeContract> ListOfContracts
{
get
{
return mListOfContracts;
}
set
{
mListOfContracts = value;
OnPropertyChanged("ListOfContracts");
}
}
public ObservableCollection<EmployeeGroup> ListOfGroups
{
get
{
return mListOfGroups;
}
set
{
mListOfGroups = value;
OnPropertyChanged("ListOfGroups");
}
}
public Common.Employee MasterEmployee
{
get
{
return mMasterEmployee;
}
set
{
mMasterEmployee = value;
OnPropertyChanged("MasterEmployee");
}
}
public ICommand cmdAdd { get; set; }
public ICommand cmdEdit { get; set; }
public ICommand cmdDelete { get; set; }
public ICommand cmdCancel { get; set; }
public ICommand cmdOK { get; set; }
#endregion
public VM_EditEmployee(Employee.frmEditEmployee tmpView)
{
EmpoyeeView = tmpView;
cmdAdd = new RelayCommand(o => AddEntry());
cmdEdit = new RelayCommand(o => EditEntry());
cmdDelete = new RelayCommand(o => DeleteEntry());
cmdCancel = new RelayCommand(o => Cancel());
cmdOK = new RelayCommand(o => SaveEntry());
ListOfEmployees = Database_Employee.GetListOfEmployee();
ListOfContracts = Database_Contract.GetListOfContract();
ListOfGroups = Database_Group.GetListOfGroups();
}
protected internal void OnPropertyChanged(string propertyname)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyname));
}
private void DeleteEntry()
{
if (MessageBox.Show("Sure you want to delete?", "Question", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
{
Database_Employee.DeleteEmployee(MasterEmployee);
ListOfEmployees = Database_Employee.GetListOfEmployee();
}
}
private void Cancel()
{
}
private void AddEntry()
{
isNew = true;
Common.Employee newEmployee = new Common.Employee()
{
Forname = "Max",
Lastname = "Mustermann",
Showingname = "Max",
EmployeeID = 666,
Birthday = new System.DateTime(1980, 5, 5),
Loan = "9,50",
Contract = Database_Contract.GetListOfContract()[0],
Group = Database_Group.GetListOfGroups()[0],
Telephone = "012456789",
EMail = "chris@roedernet.de",
isHiding = false
};
ListOfEmployees.Add(newEmployee);
MasterEmployee = newEmployee;
}
private void EditEntry()
{
isNew = false;
}
private void SaveEntry()
{
if (isNew == true)
{
Database_Employee.CreateEmployee(MasterEmployee);
}
else {
Database_Employee.EditEmployee(MasterEmployee);
}
ListOfEmployees = Database_Employee.GetListOfEmployee();
}
else // Wenn der EditMode nict aktiv ist
{
EmpoyeeView.Close();
}
}
}
}
＆＃34; MasterEmployee＆＃34; property用于访问ViewModel中的选定项以保存员工中的更改。 一切正常，ListBox充满了数据，ListBox中所选员工的详细信息在文本框中正确显示（还有更多只有这一个，但对于这个问题不是必需的。）
当我创建一个新员工时，我创建了一个类员工的新实例，用一些占位符信息填充它，并将MasterEmployee的引用设置为这个新员工，因为我想在文本框中编辑新员工风景。然后我编辑新员工，保存更改并希望转到ListView中的其他员工，没有任何反应。我猜是因为当我设置MasterEmployee的引用时，与ListBox的绑定将丢失。
所以我的问题是：我该如何解决这个问题？我想保留MVVM模式，意思是，通过代码设置绑定我需要访问viewmodel中的视图，而不是MVVM。
非常感谢！ 克里斯
答案 0 :(得分：1)
我看到发布的代码有几个问题，可能是因为它不完整：
SelectedItem：您的文本框等与SelectedItem绑定，但您的VM上没有此类属性。你可能想要绑定到MasterEmployee。 （注意：我宁愿将SelectedItem命名为）。我认为这是你所看到的根本原因。SaveEntry时，您可能完全重新创建列表。因此MasterEmployee不再存在于该列表中。我认为这可能会导致进一步的错误。您正在显示不在列表中的节点。如果这没有帮助，请提供一个完整的简单示例，因为您发布的代码不完整且无法编译。尽量缩小你的问题范围。
答案 1 :(得分：-1)
问题解决了，这是我的员工类的问题，我已经覆盖了GetHashCode函数以返回employeeID。这会在编辑employeeID时使绑定制动起来...感谢您的努力！