我似乎在向 a 添加行时遇到问题DataGrid
通过界面本身。
这是用户界面的屏幕截图:
正如您所看到的,在数据库中找到了 0 行,因此没有任何内容显示在数据库中DataGrid
在右侧。
但我喜欢那里有一个空行,用于手动添加行。
这DataGrid.CanUserAddRows
被设定为True
但没有效果。
这里是xaml
为了DataGrid
,我冒昧地删除了一些代码以使其更小。
权限详细信息视图.xaml
<UserControl ...
d:DataContext="{d:DesignInstance impl:PrivilegeDetailsViewModel}">
<DataGrid ...
ItemsSource="{Binding RolesHasPrivilegesOnObjects}"
AutoGenerateColumns="False"
CanUserAddRows="True">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Type" CanUserSort="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate DataType="{x:Type int:IRoleHasPrivilegeOnObjectListItemViewModel}">
<Image Source="{Binding Icon}" ToolTip="{Binding ToolTip}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Width="*" Header="Name" Binding="{Binding Name}"/>
<DataGridCheckBoxColumn Header="Select" Binding="{Binding HasSelect, UpdateSourceTrigger=PropertyChanged}">
<DataGridCheckBoxColumn.ElementStyle>
<Style TargetType="CheckBox">
<Style.Triggers>
<DataTrigger Binding="{Binding CanHaveSelect}" Value="True">
<Setter Property="IsEnabled" Value="True"/>
<Setter Property="HorizontalAlignment" Value="Center"/>
</DataTrigger>
<DataTrigger Binding="{Binding CanHaveSelect}" Value="False">
<Setter Property="IsEnabled" Value="False"/>
<Setter Property="HorizontalAlignment" Value="Center"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGridCheckBoxColumn.ElementStyle>
</DataGridCheckBoxColumn>
...
</DataGrid.Columns>
</DataGrid>
</UserControl>
PrivilegeDetailsView.xaml.cs
public partial class PrivilegeDetailsView : IPrivilegeDetailsView
{
public PrivilegeDetailsView() { InitializeComponent(); }
public DataGrid PrivilegesOnObjectsDataGrid { get { return PrivilegeDataGrid; } }
public IViewModel ViewModel
{
get { return (IViewModel)DataContext; }
set { DataContext = value; }
}
}
这里是ViewModel (VM)
为了xaml
View
above:
PrivilegeDetailsViewModel.cs
public class PrivilegeDetailsViewModel : ViewModelBase, IPrivilegeDetailsViewModel
{
private readonly IEventAggregator _eventAggregator;
private readonly IPrivilegeViewModel _privilegeViewModel;
private readonly IRoleHasPrivilegeOnObjectViewModelAdapterRepository _roleHasPrivilegeOnObjectViewModelAdapterRepository;
private ObservableCollection<IRoleHasPrivilegeOnObjectListItemViewModel> _rolesHasPrivilegesOnObjects;
public PrivilegeDetailsViewModel(IPrivilegeDetailsView view,
IRoleHasPrivilegeOnObjectViewModelAdapterRepository roleHasPrivilegeOnObjectViewModelAdapterRepository,
IPrivilegeViewModel privilegeViewModel,
IEventAggregator eventAggregator) : base(view)
{
_roleHasPrivilegeOnObjectViewModelAdapterRepository = roleHasPrivilegeOnObjectViewModelAdapterRepository;
_privilegeViewModel = privilegeViewModel;
_eventAggregator = eventAggregator;
Initialize();
}
protected override sealed void Initialize()
{
_privilegeViewModel.PropertyChanged += PrivilegeViewModelOnPropertyChanged;
_eventAggregator.GetEvent<ToggleSelectPrivilegeEvent>().Subscribe(ToggleSelectPrivilege);
...
}
public new IPrivilegeDetailsView View
{
get { return (IPrivilegeDetailsView)base.View; }
}
public ObservableCollection<IRoleHasPrivilegeOnObjectListItemViewModel> RolesHasPrivilegesOnObjects
{
get { return _rolesHasPrivilegesOnObjects; }
set
{
_rolesHasPrivilegesOnObjects = value;
OnPropertyChanged();
}
}
public void Save()
{
if(RolesHasPrivilegesOnObjects == null) return;
_roleHasPrivilegeOnObjectViewModelAdapterRepository.SaveChanges(RolesHasPrivilegesOnObjects);
}
private void ToggleExecutePrivilege(object obj)
{
var toggle = !View.PrivilegesOnObjectsDataGrid.SelectedItems.Cast<IRoleHasPrivilegeOnObjectListItemViewModel>()
.All(x => x.HasExecute);
foreach(var selectedItem in View.PrivilegesOnObjectsDataGrid
.SelectedItems
.Cast<IRoleHasPrivilegeOnObjectListItemViewModel>()
.Where(selectedItem => selectedItem.Object
.CanHavePrivilege("EXECUTE"))) {
selectedItem.HasExecute = toggle;
}
}
...
private void PrivilegeViewModelOnPropertyChanged(object s, PropertyChangedEventArgs e)
{
switch(e.PropertyName)
{
//When the SelectedSchema changes in the parent VM, I get the new rows to be shown in the DataGrid.
case "SelectedSchema":
RolesHasPrivilegesOnObjects = _roleHasPrivilegeOnObjectViewModelAdapterRepository
.GetPrivilegesOnObjectsAssociatedWith((IRoleEntityViewModel)_privilegeViewModel.SelectedRole,
(IContainerEntityViewModel)_privilegeViewModel.SelectedSchema);
break;
}
}
}
这是VM
对于中的每一行DataGrid
RoleHasPrivilegeOnObjectEntityViewModel.cs
public class RoleHasPrivilegeOnObjectEntityViewModel : EntityViewModelBase<RoleHasPrivilegeOnObjectEntityViewModel,
RoleHasPrivilegesOnObject>,
IRoleHasPrivilegeOnObjectListItemViewModel
{
private readonly RoleHasPrivilegesOnObject _roleHasPrivilegesOnObject;
public RoleHasPrivilegeOnObjectEntityViewModel(RoleHasPrivilegesOnObject roleHasPrivilegesOnObject)
{
_roleHasPrivilegesOnObject = roleHasPrivilegesOnObject;
Role = new RoleEntityViewModel(_roleHasPrivilegesOnObject.Role);
Object = new ObjectEntityViewModel(_roleHasPrivilegesOnObject.Object);
}
public override EntityType EntityType { get { return EntityType.NONE; } }
public override RoleHasPrivilegesOnObject OriginalEntity { get { return _roleHasPrivilegesOnObject; } }
public IRoleEntityViewModel Role { get; set; }
public IObjectEntityViewModel Object { get; set; }
public string ToolTip { get { return _roleHasPrivilegesOnObject.ToolTip; } }
public bool HasExecute
{
get { return _roleHasPrivilegesOnObject.HasExecute; }
set
{
_roleHasPrivilegesOnObject.HasExecute = value;
OnPropertyChanged();
}
}
public bool CanHaveExecute { get { return _roleHasPrivilegesOnObject.CanHaveExecute; } }
public override string Icon { get { return Object != null ? Object.Icon : string.Empty; } }
public override string NAME
{
get { return _roleHasPrivilegesOnObject.NAME; }
set
{
_roleHasPrivilegesOnObject.NAME = value;
OnPropertyChanged();
}
}
...
}
我知道这是很多代码,我已经删除了很多代码并放置了一些点(...)以表明存在更多代码。注意:我正在使用EF5 http://msdn.microsoft.com/en-us/data/ef.aspx and PRISM http://compositewpf.codeplex.com/
我怎样才能使DataGrid
通过 GUI 接受新行?