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时，我有一些问题，数据绑定...这里的情况是：ListBox.SelectedItem取消绑定设置的SelectedIndex
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>
我的视图模型：
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 = "[email protected]",
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();
}
}
}
}
的“MasterEmployee”属性用于访问ViewModel中的选定项目以保存员工中的更改。 一切工作正常，列表框填充数据，并在列表框选择员工的详细信息在文本框中正确显示（有更多的则只是这一个，但它没有必要这个问题）。
当我创建一个新员工时，我创建了一个新员工类的实例，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，因为我想编辑文本框中的新员工的看法。然后，我编辑新员工，保存更改并想要转到ListView中的其他员工，但没有任何反应。我猜是因为当我设置MasterEmployee的引用时，与ListBox的绑定丢失了。
所以我的问题是：我怎样才能解决这个问题？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，那些不是MVVM。
非常感谢！ 克里斯
_“我猜这是因为当我设置MasterEmployee的参考，与列表框丢失绑定” _ - 没了。如果在代码后面直接设置'SelectedItem'，绑定将会丢失。事实上，设置'MasterEmployee'属性_is_是更改所选项目的正确方法。你的代码还有其他错误。但如果没有一个可靠地再现问题的好的[mcve]，就不可能有人能够确切地说出什么是错的。 –
在Model_EditEmployee中，ListOfEmployees属性设置为新集合看起来很奇怪。这显然会使MasterEmployee属性无效，因为它的值不再包含在ListOfEmployees中。 – Clemens
我认为问题出在这个陈述中：_“并且想要去另一个员工”_。保存后如何选择其他项目？ –