【发布时间】：2015-03-06 15:55:02
【问题描述】：
我想在单击菜单项时隐藏网格视图列。
Xaml：
<MenuItem Header="View">
<MenuItem Header="Columns" Name="menuView" ItemsSource="{Binding Path= MyMenuItems}">
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Header" Value="{Binding Header}" />
<Setter Property="IsChecked" Value="{Binding IsChecked,Mode=TwoWay}"/>
<Setter Property="IsCheckable" Value="{Binding IsCheckable}"/>
<Setter Property="Icon" Value= "{Binding ImageIcon}"/>
<Setter Property="IsEnabled" Value= "{Binding Path =IsEnabled}"/>
<Setter Property="ItemsSource" Value="{Binding Path= MyMenuItems}"/>
<Setter Property= "Command" Value= "{Binding DataContext.CheckedViewMenuItemsCmd, RelativeSource ={RelativeSource AncestorType={x:Type MenuItem}}}"/>
<Setter Property="CommandParameter" Value="{Binding}" />
<Setter Property="StaysOpenOnClick" Value="{Binding StaysOpenOnClick}"/>
</Style> </MenuItem.ItemContainerStyle>
</MenuItem>
<ListView Name="MyListView" Grid.Row="1" SelectedItem ="{Binding SelectedFeature}" ItemsSource="{Binding Path= MyListItems}">
<ListView.View>
<GridView util:GridViewColumnClass.HeaderTextMember="HeaderText"
util:GridViewColumnClass.DisplayMemberMember="DisplayMember"
util:GridViewColumnClass.ColumnsSource=" {Binding Columns}"/>
</ListView.View>
菜单项标题与网格视图列标题相同。选中或未选中菜单项时，我希望显示网格视图列或隐藏。
我确实有一个与这里类似的 GidViewColumnVisibilityManager 。 WPF: How to hide GridViewColumn using XAML?
视图模型：
public MyViewModel()
{
MyListItems = SomeClass.instance.messages;
_MenuItems = new ObservableCollection<MenuClass>();
//populates the view menu
PopulateViewMenu();
this.Columns = new ObservableCollection<ColumnDescriptor>
{
new ColumnDescriptor{ Width = 40, HeaderText ="column1", DisplayMember= "column1"},
new ColumnDescriptor{ Width = 40, HeaderText="column2" , DisplayMember= "column2"},
new ColumnDescriptor{ Width = 70, HeaderText="column3" , DisplayMember="column3"},
};
//event to command
CheckedViewMenuItemsCmd = new RelayCommand<MenuClass>(CheckedViewMenuItems);
}
public ObservableCollection<ColumnDescriptor> Columns { get; private set; }
private ICommand _addColumnCommand;
public ICommand AddColumnCommand
{
get
{
if (_addColumnCommand == null)
{
_addColumnCommand = new RelayCommand<string>(
s =>
{
this.Columns.Add(new ColumnDescriptor { HeaderText = s, DisplayMember = s });
});
}
return _addColumnCommand;
}
}
private ICommand _removeColumnCommand;
public ICommand RemoveColumnCommand
{
get
{
if (_removeColumnCommand == null)
{
_removeColumnCommand = new RelayCommand<string>(
s =>
{
this.Columns.Remove(this.Columns.FirstOrDefault(d => d.DisplayMember == s));
});
}
return _removeColumnCommand;
}
}
private void CheckedViewMenuItems(MenuClass m)
{
try
{
bool IsChecked = m.IsChecked;
if (IsChecked)
{
ColumnDescriptor cl1 = new ColumnDescriptor{ Width = 40, HeaderText =m.Header, DisplayMember= "Revision"};
int idx = Convert.ToInt32(m.Tag);
int insertidx = Math.Min(idx, this.Columns.Count);
this.Columns.Insert(insertidx, cl1);
}
else
{
foreach (var item in this.Columns)
{
if (item.HeaderText == m.Header)
{
// item.DisplayMember = "";
this.Columns.Remove(item);
break;
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine(String.Format("{0}{1}{2}{1}{3}", ex.GetType().ToString(), Environment.NewLine, ex.Message, ex.StackTrace));
}
}
我对如何使用 booleon 到可见转换器并实现该功能感到有些困惑。感谢您的帮助。如果您有任何问题，请向我提问。谢谢各位。 我尝试插入和删除而不是显示和隐藏，删除就像一个魅力，但插入需要一个显示成员绑定来每次绑定到集合，这是显而易见的。我尝试了一个专栏，它工作正常，我需要它为所有人工作。有什么想法吗？
【问题讨论】：
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谢谢...是的，他们不应该有标签。对不起。