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您好，对于长篇帖子感到抱歉。我希望没有人问过同样的问题。如果是这样，我请你找借口。 我使用MVVM方法动态添加TabItem时遇到问题，从另一个TabItem的内容中，女士是UserControl。 的MainWindow具有绑定一个视图模型类叫做TabsMainViewModel：MVVM WPF从另一个TabItem的内容中添加TabItem
<Window x:Name="Main" x:Class="Interface_test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:Interface_test"
xmlns:uc="clr-namespace:Interface_test.Customers"
Title="MainWindow" Height="850" Width="825" WindowStartupLocation="CenterScreen" WindowState="Maximized">
<Window.DataContext>
<vm:TabsMainViewModel />
</Window.DataContext>
<Window.Resources>
<DataTemplate x:Key="TabItemTemplate">
<DockPanel>
<Button Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}"
Background="Transparent"
Name="btnDelete"
DockPanel.Dock="Right"
Margin="5,0,0,0"
Padding="0"
Command="{Binding RemoveItemCommand}">
<Image Height="11" Width="11" Source="Images/closeButton.png"/>
</Button>
<TextBlock Text="{Binding Header}" />
</DockPanel>
</DataTemplate>
<DataTemplate x:Key="TabItemContent" >
<UserControl Content="{Binding TabContent}"/>
</DataTemplate>
<Style TargetType="TabItem">
<Setter Property="IsSelected"
Value="{Binding IsSelected, Mode=TwoWay}"/>
</Style>
</Window.Resources>
<TabControl ItemTemplate="{StaticResource TabItemTemplate}"
ContentTemplate="{StaticResource TabItemContent}"
ItemsSource="{Binding Tabs}"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
VerticalContentAlignment="Stretch"
HorizontalContentAlignment="Stretch"
Name="tcMDI"
Visibility="Visible"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Auto" >
在TabsMainViewModel我有一个ObservableCollection称为TabViewModel的定制类。
public class TabsMainViewModel
{
int tabCounter;
private Dictionary<string, string> _openedTabs = new Dictionary<string, string>();
public TabsMainViewModel()
{
this.Tabs=new ObservableCollection<TabViewModel>();
//this.AddItem(null);
}
public ObservableCollection<TabViewModel> Tabs
{
get;
private set;
}
public ICommand CustomerSearch
{
get
{
CustomerSearch f = new CustomerSearch() { UniqueTabName = "NewTab1", Title = "Customer Search" };
return new DelegateCommand(delegate { this.AddItem(f); });
}
}
public ICommand Customer
{
get
{
Customer f = new Customer() { UniqueTabName = "NewTab2", Title = "Customer" };
return new DelegateCommand(delegate { this.AddItem(f); });
}
}
public ICommand EmployerSearch
{
get
{
CustomerSearch f = new CustomerSearch() { UniqueTabName = "NewTab3", Title = "Employer Search" };
return new DelegateCommand(delegate { this.AddItem(f); });
}
}
public ICommand Employer
{
get
{
Customer f = new Customer() { UniqueTabName = "NewTab4", Title = "Employer" };
return new DelegateCommand(delegate { this.AddItem(f); });
}
}
public void AddItem(ITabContent userControl)
{
if (_openedTabs.ContainsKey(userControl.UniqueTabName))
{
foreach (TabViewModel tvm in Tabs)
{
if (userControl.UniqueTabName == tvm.TabContent.UniqueTabName)
{
tvm.IsSelected = true;
break;
}
}
}
else
{
TabViewModel tabItem = new TabViewModel(this) { TabContent = userControl };
tabItem.TabContent.Title += " " + tabCounter;
tabItem.IsSelected = true;
Tabs.Add(tabItem);
_openedTabs.Add(tabItem.TabContent.UniqueTabName, tabItem.TabContent.Title);
tabCounter++;
}
}
public void RemoveItem(TabViewModel tabItem)
{
this.Tabs.Remove(tabItem);
_openedTabs.Remove(tabItem.TabContent.UniqueTabName);
tabItem.Dispose();
}
}
}
的TabViewModel类，我有：
public class TabViewModel:ObservableObject,IDisposable
{
private bool _isSelected;
private ITabContent _tabContent;
private readonly TabsMainViewModel tabsMainViewModel;
public TabViewModel(TabsMainViewModel tabsMainViewModel)
{
this.tabsMainViewModel = tabsMainViewModel;
this.tabsMainViewModel.Tabs.CollectionChanged += this.Tabs_CollectionChanged;
this.RemoveItemCommand = new DelegateCommand(
delegate
{
this.tabsMainViewModel.RemoveItem(this);
},
delegate
{
return this.tabsMainViewModel.Tabs.Count > 1;
}
);
}
public void Dispose()
{
this.tabsMainViewModel.Tabs.CollectionChanged -= this.Tabs_CollectionChanged;
}
private void Tabs_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
this.RemoveItemCommand.RaiseCanExecuteChanged();
}
public DelegateCommand RemoveItemCommand { get; set; }
public ITabContent TabContent
{
get { return _tabContent;}
set
{
_tabContent = value;
_tabContent.Parent = this;
Header = value.Title;
}
}
public String Header
{
get;
private set;
}
public bool IsSelected
{
get { return this._isSelected; }
set
{
if (this._isSelected != value)
{
this._isSelected = value;
RaisePropertyChangedEvent("IsSelected");
}
}
}
}
}
在TabContent属性我设置出现在TabItem的内容UserControl。我的问题是：如何在这个CustomerSearch用户控件中放置一个按钮，并且该按钮绑定类似ICommand或DelegateCommand（例如在其CustomerSearchViewModel中）可以执行TabsMainViewModel中的AddItem函数？
如果需要，我可以发帖和ObservableObject和DelegateCommand类 和ITabContent接口。 在此先感谢
请，从来没有实施'的Dispose（）'方法像你这样做是为了'TabViewModel'类。垃圾回收器可以以非确定的方式调用此方法，这意味着 - 您无法知道何时，多少次以及由哪个线程调用它。 – dymanoid
感谢您的提示。我会记住这一点。关于我问过的问题的任何建议？ :) –