所以，我有一个代码：
<tool:LongListSelector x:Name="citiesListGropus" Background="Transparent"
ItemTemplate="{StaticResource citiesItemTemplate}"
GroupHeaderTemplate="{StaticResource groupHeaderTemplate}"
GroupItemTemplate="{StaticResource groupItemTemplate}" Height="468" Margin="0,68,0,0">
<tool:LongListSelector.GroupItemsPanel>
<ItemsPanelTemplate>
<tool:WrapPanel/>
</ItemsPanelTemplate>
</tool:LongListSelector.GroupItemsPanel>
</tool:LongListSelector>
并有一个DataTemplate：
<DataTemplate x:Key="groupHeaderTemplate" x:Name="groupHeaderTemplateName">
<Border Background="{StaticResource PhoneAccentBrush}" Width="75" Height="75" Margin="-333, 15, 0, 15" x:Name="groupHeaderName">
<TextBlock Text="{Binding Title}" FontSize="40" Foreground="White" Margin="15, 15, 0, 0"/>
</Border>
</DataTemplate>
如何更改inVisibility的属性？我想躲起来。但是我无法将我的数据绑定到诸如 的属性，因为我做了一次绑定数据，然后我需要在数据绑定后更改一些属性。BorderDataTemplateDataTemplateTextBlock Text="{Binding Title}"
有任何想法吗？
更新 1
所以，我的主要目标是过滤城市列表。我想按名称过滤它们。
我的算法：
1）我从WebService.
2）加载我的ViewModel
if (!App.CitiesViewModel.IsDataLoaded)
{
App.CitiesViewModel.LoadData(serviceResponse.Result);
}
3) 按名称对城市进行分组。我的代码喜欢这个代码。这很重要，尤其是因为LongListSeletstor我必须使用模板。
好的，我的数据准备好了。现在我不需要网络服务。
<!-- The template for city items -->
<DataTemplate x:Key="citiesItemTemplate">
<StackPanel Name="PlacePanel"
Orientation="Horizontal" Margin="0,0,0,17"
Tag="{Binding Id}" Visibility="{Binding IsVisibility}">
<Image Height="75" Width="75" HorizontalAlignment="Left" Margin="12,0,9,0" Name="Image" Stretch="Fill" VerticalAlignment="Top" Source="{Binding Image}"/>
<StackPanel Width="311">
<TextBlock Text="{Binding Name}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
</StackPanel>
</StackPanel>
</DataTemplate>
我有TextBox，当我输入城市名称时 - 隐藏不必要的城市。我可以使用数据绑定和INotifyPropertyChanged，所以我可以隐藏城市。
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
TextBox name = (TextBox)sender;
foreach(var place in App.CitiesViewModel.Items
.Where(city => (city.Name.Contains(name.Text)) && (city.IsShow == true)))
{
city.IsVisibility = Visibility.Visible;
}
foreach (var city in App.CitiesViewModel.Items
.Where(city => !city.Name.Contains(name.Text)))
{
city.IsVisibility = Visibility.Collapsed;
}
}
DataTemplate但是我有一些问题，当我搜索城市时我无法隐藏这个：
<DataTemplate x:Key="groupHeaderTemplate" x:Name="groupHeaderTemplateName">
<Border Background="{StaticResource PhoneAccentBrush}" Width="75" Height="75" Margin="-333, 15, 0, 15" x:Name="groupHeaderName">
<TextBlock Text="{Binding Title}" FontSize="40" Foreground="White" Margin="15, 15, 0, 0"/>
</Border>
</DataTemplate>
当我输入我想要隐藏的城市名称时GroupHeaderTemplate。当TextBox失去焦点显示GroupHeaderTemplate。
我在这里借了这张照片。
更新 2
我的错误是我没有使用PropertyChangedEventHandler. 将此添加到 GroupCity 属性并实现接口后，我可以在数据绑定后INotifyPropertyChanged更改属性。Data Template
private IList<Group<City>> citiesCollectionGroup;
var cityByName = from city in App.ViewModel.Items
group city by Convert.ToString(City.Name[0]).ToLower()
into c orderby c.Key select new
GroupCity<CitiesViewModel>(Convert.ToString(c.Key[0]).ToLower(), c);
citiesCollectionGroup = cityByName.ToList();
this.citiesListGropus.ItemsSource = citiesCollectionGroup;
public class GroupCity<T> : IEnumerable<T>, INotifyPropertyChanged
{
public GroupCity(string name, IEnumerable<T> items)
{
this.Title = name;
this.IsVisibility = Visibility.Visible;
this.Items = new List<T>(items);
}
public override bool Equals(object obj)
{
GroupCity<T> that = obj as GroupCity<T>;
return (that != null) && (this.Title.Equals(that.Title));
}
public string Title
{
get;
set;
}
private Visibility _isVisibility;
public Visibility IsVisibility
{
get
{
return _isVisibility;
}
set
{
_isVisibility = value;
NotifyPropertyChanged("IsVisibility");
}
}
public IList<T> Items
{
get;
set;
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
#region IEnumerable<T> Members
public IEnumerator<T> GetEnumerator()
{
return this.Items.GetEnumerator();
}
#endregion
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this.Items.GetEnumerator();
}
#endregion
}
Xml代码：
<DataTemplate x:Key="groupHeaderTemplate" x:Name="groupHeaderTemplateName">
<Border Background="{StaticResource PhoneAccentBrush}" Width="75" Height="75" Margin="-333, 15, 0, 15" x:Name="groupHeaderName" Visibility="{Binding IsVisibility}">
<TextBlock Text="{Binding Title}" FontSize="40" Foreground="White" Margin="15, 15, 0, 0"/>
</Border>
</DataTemplate>
现在我们可以更改VisibilitygroupHeaderTemplate。
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
foreach (GroupCity<CitiesViewModel> city in citiesCollectionGroup)
{
city.IsVisibility = Visibility.Collapsed;
}
//
}
private void SearchText_LostFocus(object sender, RoutedEventArgs e)
{
foreach (GroupCity<CitiesViewModel> city in citiesCollectionGroup)
{
city.IsVisibility = Visibility.Visible;
}
//
}
