C#UWP获取列表视图中的项目';项目模板
我试图访问listview中的文本块和文本框,但无法在C代码中获取它们,因为它们位于ItemTemplate和DataTemplate中。以下是XAML代码的示例:C#UWP获取列表视图中的项目';项目模板,c#,win-universal-app,datatemplate,listviewitem,C#,Win Universal App,Datatemplate,Listviewitem,我试图访问listview中的文本块和文本框,但无法在C代码中获取它们,因为它们位于ItemTemplate和DataTemplate中。以下是XAML代码的示例: <ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisab
<ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisabledForegroundThemeBrush}" SelectionChanged="VehicleList_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<Grid x:Name="VehicleGrid" Height="52" Width="1117" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="20,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="318*"/>
<ColumnDefinition Width="425*"/>
<ColumnDefinition Width="366*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="Year" Grid.Column="0" TextWrapping="Wrap" Text="{Binding Year}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667"/>
<TextBlock x:Name="Make" Grid.Column="1" TextWrapping="Wrap" Text="{Binding Make}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" />
<TextBlock x:Name="Model" Grid.Column="2" TextWrapping="Wrap" Text="{Binding Model}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667"/>
<TextBox x:Name="AddYear" Grid.Column="0" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddMake" Grid.Column="1" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddModel" Grid.Column="2" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667" Visibility="Collapsed"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
是否仍然可以获取数据模板中的项目?如果您可以通过单击按钮来执行此操作;您可以使用CommandParameter或遍历VisualTree,如下两个链接所示:
如果您可以通过单击按钮来执行此操作;您可以使用CommandParameter或遍历VisualTree,如下两个链接所示:
您的问题对于所有XAML口味都是通用的,在WPF和Silverlight中也是如此。问题在于您的数据模板。请记住,XAML将为列表中的每个项目注入DataTemplate的内容一次。这意味着您的名称只能存在于DataTemplate实例的范围内 如果您已经为模板编写了代码,那么通过创建UserControl可能会做得更好。请参见下面的示例:
<!-- most boiler plate code skipped -->
<UserControl x:Class="MyProject.VehicleListItem">
<Grid x:Name="VehicleGrid" Height="52" Width="1117" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="20,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="318*"/>
<ColumnDefinition Width="425*"/>
<ColumnDefinition Width="366*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="Year" Grid.Column="0" TextWrapping="Wrap" Text="{Binding Year}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667"/>
<TextBlock x:Name="Make" Grid.Column="1" TextWrapping="Wrap" Text="{Binding Make}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" />
<TextBlock x:Name="Model" Grid.Column="2" TextWrapping="Wrap" Text="{Binding Model}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667"/>
<TextBox x:Name="AddYear" Grid.Column="0" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddMake" Grid.Column="1" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddModel" Grid.Column="2" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667" Visibility="Collapsed"/>
</Grid>
</UserControl>
这样,您就可以从一个可以实例化、拥有自己代码的UserControl开始执行所有需要执行的操作。您可以完全按照自己的意愿工作,然后在需要时在列表中引用它,如下所示:
<ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisabledForegroundThemeBrush}" SelectionChanged="VehicleList_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<myProject:VehicleListItem/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
public class VehicleView : UserControl
{
// Year
public static readonly DependencyProperty YearProperty =
DependencyProperty.Register("Year", typeof(int), typeof(VehicleView),
new PropertyMetadata());
public int Year
{
get { return (int)GetValue(YearProperty); }
set { SetValue(YearProperty, value); }
}
// Make
public static readonly DependencyProperty MakeProperty =
DependencyProperty.Register("Make", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Make
{
get { return (string)GetValue(MakeProperty); }
set { SetValue(MakeProperty, value); }
}
// Model
public static readonly DependencyProperty ModelProperty =
DependencyProperty.Register("Model", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Model
{
get { return (string)GetValue(ModelProperty); }
set { SetValue(ModelProperty, value); }
}
public VehicleView()
{
InitializeComponent();
}
}
ListView将为用户控件的DataContext
分配一个车辆项目,一切都将按照您设计的那样工作
有一种方法可以获得代码隐藏中的可视树,但它非常复杂。基本上,您需要使用列表视图.ItemContainerGenerator
并调用ContainerFromItem(dataItem)
(),然后沿着从中获得的可视化树走下去。这不仅是一件非常痛苦的事情,也不能保证所有的API都可以从WPF访问到UWP或SilverLight。最干净的解决方案是将代码分解成独立的部分
另一个解决方案,可能比我提出的更干净,就是利用绑定对象<代码>列表视图。选择EdItem返回绑定到
数据模板
的对象。只需从该对象获取值。如果您有一个包含AddYear
、AddMake
和AddModel
属性的ViewModel,那么由于您根本不需要处理XAML,所以可以更轻松地完成很多工作。您的问题对于所有XAML风格都是通用的,在WPF和Silverlight中也是如此。问题在于您的数据模板。请记住,XAML将为列表中的每个项目注入DataTemplate的内容一次。这意味着您的名称只能存在于DataTemplate实例的范围内
如果您已经为模板编写了代码,那么通过创建UserControl可能会做得更好。请参见下面的示例:
<!-- most boiler plate code skipped -->
<UserControl x:Class="MyProject.VehicleListItem">
<Grid x:Name="VehicleGrid" Height="52" Width="1117" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="20,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="318*"/>
<ColumnDefinition Width="425*"/>
<ColumnDefinition Width="366*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="Year" Grid.Column="0" TextWrapping="Wrap" Text="{Binding Year}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667"/>
<TextBlock x:Name="Make" Grid.Column="1" TextWrapping="Wrap" Text="{Binding Make}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" />
<TextBlock x:Name="Model" Grid.Column="2" TextWrapping="Wrap" Text="{Binding Model}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,20,0,0" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667"/>
<TextBox x:Name="AddYear" Grid.Column="0" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="321" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddMake" Grid.Column="1" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="425" FontSize="26.667" Visibility="Collapsed"/>
<TextBox x:Name="AddModel" Grid.Column="2" TextWrapping="Wrap" Text="TextBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Height="52" Grid.ColumnSpan="1" TextAlignment="Center" Width="366" FontSize="26.667" Visibility="Collapsed"/>
</Grid>
</UserControl>
这样,您就可以从一个可以实例化、拥有自己代码的UserControl开始执行所有需要执行的操作。您可以完全按照自己的意愿工作,然后在需要时在列表中引用它,如下所示:
<ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisabledForegroundThemeBrush}" SelectionChanged="VehicleList_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<myProject:VehicleListItem/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
public class VehicleView : UserControl
{
// Year
public static readonly DependencyProperty YearProperty =
DependencyProperty.Register("Year", typeof(int), typeof(VehicleView),
new PropertyMetadata());
public int Year
{
get { return (int)GetValue(YearProperty); }
set { SetValue(YearProperty, value); }
}
// Make
public static readonly DependencyProperty MakeProperty =
DependencyProperty.Register("Make", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Make
{
get { return (string)GetValue(MakeProperty); }
set { SetValue(MakeProperty, value); }
}
// Model
public static readonly DependencyProperty ModelProperty =
DependencyProperty.Register("Model", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Model
{
get { return (string)GetValue(ModelProperty); }
set { SetValue(ModelProperty, value); }
}
public VehicleView()
{
InitializeComponent();
}
}
ListView将为用户控件的DataContext
分配一个车辆项目,一切都将按照您设计的那样工作
有一种方法可以获得代码隐藏中的可视树,但它非常复杂。基本上,您需要使用列表视图.ItemContainerGenerator
并调用ContainerFromItem(dataItem)
(),然后沿着从中获得的可视化树走下去。这不仅是一件非常痛苦的事情,也不能保证所有的API都可以从WPF访问到UWP或SilverLight。最干净的解决方案是将代码分解成独立的部分
另一个解决方案,可能比我提出的更干净,就是利用绑定对象<代码>列表视图。选择EdItem返回绑定到
数据模板
的对象。只需从该对象获取值。如果您有一个包含AddYear
、AddMake
和AddModel
属性的ViewModel,那么由于您根本不需要处理XAML,因此可以更轻松地完成很多工作。UserControl
这听起来像是一个UserControl
就是你要找的
计划→ 添加用户控件
这应该很容易,因为您已经有了XAML设计。后面的代码如下所示:
<ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisabledForegroundThemeBrush}" SelectionChanged="VehicleList_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<myProject:VehicleListItem/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
public class VehicleView : UserControl
{
// Year
public static readonly DependencyProperty YearProperty =
DependencyProperty.Register("Year", typeof(int), typeof(VehicleView),
new PropertyMetadata());
public int Year
{
get { return (int)GetValue(YearProperty); }
set { SetValue(YearProperty, value); }
}
// Make
public static readonly DependencyProperty MakeProperty =
DependencyProperty.Register("Make", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Make
{
get { return (string)GetValue(MakeProperty); }
set { SetValue(MakeProperty, value); }
}
// Model
public static readonly DependencyProperty ModelProperty =
DependencyProperty.Register("Model", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Model
{
get { return (string)GetValue(ModelProperty); }
set { SetValue(ModelProperty, value); }
}
public VehicleView()
{
InitializeComponent();
}
}
用同样的方式装订单词。只需使用x:name
命名UserControl。比如:
<UserControl x:Name="vehicleview"
x:Class="MyProjectClass"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d">
<Grid>
<!-- Here's where your ListView goes. -->
<TextBox Text="{Binding ElementName=vehicleview, Path=Model}"/>
<Grid>
</UserControl>
用户控制 这听起来像是一个
UserControl
就是你要找的
计划→ 添加用户控件
这应该很容易,因为您已经有了XAML设计。后面的代码如下所示:
<ListView x:Name="VehicleList" HorizontalAlignment="Center" Height="120" Margin="0" VerticalAlignment="Center" Width="1119" Background="{ThemeResource CheckBoxDisabledForegroundThemeBrush}" SelectionChanged="VehicleList_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<myProject:VehicleListItem/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
public class VehicleView : UserControl
{
// Year
public static readonly DependencyProperty YearProperty =
DependencyProperty.Register("Year", typeof(int), typeof(VehicleView),
new PropertyMetadata());
public int Year
{
get { return (int)GetValue(YearProperty); }
set { SetValue(YearProperty, value); }
}
// Make
public static readonly DependencyProperty MakeProperty =
DependencyProperty.Register("Make", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Make
{
get { return (string)GetValue(MakeProperty); }
set { SetValue(MakeProperty, value); }
}
// Model
public static readonly DependencyProperty ModelProperty =
DependencyProperty.Register("Model", typeof(string), typeof(VehicleView),
new PropertyMetadata("None"));
public string Model
{
get { return (string)GetValue(ModelProperty); }
set { SetValue(ModelProperty, value); }
}
public VehicleView()
{
InitializeComponent();
}
}
用同样的方式装订单词。只需使用x:name
命名UserControl。比如:
<UserControl x:Name="vehicleview"
x:Class="MyProjectClass"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d">
<Grid>
<!-- Here's where your ListView goes. -->
<TextBox Text="{Binding ElementName=vehicleview, Path=Model}"/>
<Grid>
</UserControl>
我可以看到您使用了绑定 在
VehicleList\u Selection Changed
上,您可以执行以下操作
List<YouClass-Model> selectedItems = VehicleList.SelectedItems.Cast<YouClass-Model>().ToList();
这样就可以加载绑定的数据。exitemClicked.型号
还要确保数据绑定正确<