Question

在ViewModel中使用此代码：

public CollectionViewModel<EfAttach, Guid, IDomainModelContextUnitOfWork> EfIncomingAttachesDetails
    {
        get
        {
            return GetDetailsCollectionViewModel((EfIncomingViewModel x) => x.EfIncomingAttachesDetails, x => x.Attaches, x => x.DocumentId, (x, key) => x.DocumentId = key);
        }
    }

这是ViewModel的详细信息

和XAML代码

<Grid dxb:MergingProperties.AllowMerging="False" x:Name="EfIncomingAttachesDetailsPanel" dxb:BarNameScope.IsScopeOwner="True" DataContext="{Binding EfIncomingAttachesDetails}" dxlc:LayoutControl.TabHeader="{x:Static res:Resources.Attaches}">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <dxb:ToolBarControl>
                                    <dxb:BarButtonItem BarItemDisplayMode="ContentAndGlyph" Content="{x:Static res:Resources.New}" Command="{Binding NewCommand}"  Glyph="{dx:DXImageOffice2013 Image=New_16x16.png}"/>
                                    <dxb:BarButtonItem BarItemDisplayMode="ContentAndGlyph" Content="{x:Static res:Resources.Refresh}" Command="{Binding RefreshCommand}"  Glyph="{dx:DXImageOffice2013 Image=Refresh_16x16.png}"/>
                                </dxb:ToolBarControl>...

如何覆盖按钮上的命令＆＃34;新＆＃34;？

Answer 1

看一下GetDetailsCollectionViewModel方法实现 - 这个实现很简单。基于此实现，您可以创建自己的方法，该方法返回特定的DetailsViewModel，如下所示：

public IncomingAttachesCollectionViewModel EfIncomingAttachesDetails {
    get { return GetIncomingAttachesDetails(x => x.EfIncomingAttachesDetails); }
}

protected IncomingAttachesCollectionViewModel GetIncomingAttachesDetails(
    Expression<Func<EfIncomingViewModel , IncomingAttachesCollectionViewModel>> propertyExpression) {
    return GetCollectionViewModelCore<IncomingAttachesCollectionViewModel, EfAttach, EfAttach, Guid>(
        propertyExpression, () => IncomingAttachesCollectionViewModel.Create(UnitOfWorkFactory,
                AppendForeignKeyPredicate<EfAttach, EfAttach, Guid>(x => x.DocumentID, null),
                CreateForeignKeyPropertyInitializer<EfAttach, Guid>((x, key) => x.DocumentID = key, () => PrimaryKey),
                () => CanCreateNewEntity()));
}

此处IncomingAttachesCollectionViewModel的实施方式如下：

public class IncomingAttachesCollectionViewModel : CollectionViewModel<EfAttach, Guid, IDomainModelContextUnitOfWork> {
    internal static IncomingAttachesCollectionViewModel Create(IUnitOfWorkFactory<IDomainModelContextUnitOfWork> unitOfWorkFactory = null,
        Func<IRepositoryQuery<EfAttach>, IQueryable<EfAttach>> projection = null,
        Action<EfAttach> propertyInitializer = null,
        Func<bool> canCreateNewEntity = null) {
        return ViewModelSource.Create(() => new IncomingAttachesCollectionViewModel(unitOfWorkFactory, projection, propertyInitializer, canCreateNewEntity));
    }
    protected IncomingAttachesCollectionViewModel(IUnitOfWorkFactory<IDomainModelContextUnitOfWork> unitOfWorkFactory = null,
        Func<IRepositoryQuery<EfAttach>, IQueryable<EfAttach>> projection = null,
        Action<EfAttach> propertyInitializer = null,
        Func<bool> canCreateNewEntity = null)
        : base(unitOfWorkFactory ?? UnitOfWorkSource.GetUnitOfWorkFactory(), x => x.Attaches, projection, propertyInitializer, canCreateNewEntity) {
    }
    public override void New() {
        base.New();
        /*  do something here */
    }
}

如何在DetailsCollectionViewModel中覆盖NewCommand

1 个答案: