问题：
UWP：在按钮单击事件时取消选中ListView中的复选框
隆功
我试图在按钮单击事件上清除Popup=>ListView中的选中复选框。
我尝试过循环listview并将property设置为false，但这不起作用。
在此处输入代码x:class=“uc.mainpage”xmlns=“http://schemas.microsoft.com/winfx/2006/xaml/presentation”xmlns:x=“http://schemas.microsoft.com/winfx/2006/xaml”xmlns:local=“using：uc”xmlns:d=“http://schemas.microsoft.com/expression/blend/2008”xmlns:mc=“http://schemas.openxmlformats.org/markup-compatibility/2006”mc:Ignorable=“d”xmlns:mvsc=“using：uc.models
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid>
<StackPanel>
<Button x:Name="btn_Add" Content="Add" Margin="420,10,10,0" Click="Btn_Add_Click"/>
</StackPanel>
<StackPanel Margin="10,50,10,0">
<TextBlock Text="Selected List" Margin="10" HorizontalAlignment="Left" VerticalAlignment="Top" />
<Border BorderBrush="{StaticResource ApplicationForegroundThemeBrush}"
Background="{StaticResource ApplicationPageBackgroundThemeBrush}"
BorderThickness="1" Margin="10,0,800,5" Height="300">
<ListView x:Name="lstViewSelectedData" ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollMode="Enabled">
<ListView.ItemTemplate>
<DataTemplate x:DataType="mvsc:SelectedDataModel">
<StackPanel Orientation="Horizontal">
<TextBlock VerticalAlignment="Center" x:Name="txtSelectedData" Text="{x:Bind Message}"></TextBlock>
<AppBarButton VerticalAlignment="Bottom" Click="AppBarButton_Click" Icon="Delete"
Tag="{x:Bind Id, Mode=OneWay}" >
</AppBarButton>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Border>
</StackPanel>
<Popup x:Name="popup1" VerticalOffset="10" HorizontalOffset="450" IsLightDismissEnabled="True"
HorizontalAlignment="Stretch" Margin="50" VerticalAlignment="Stretch">
<Border BorderBrush="{StaticResource ApplicationForegroundThemeBrush}"
Background="{StaticResource ApplicationPageBackgroundThemeBrush}"
BorderThickness="1" Width="450" Height="400" >
<StackPanel x:Name="stkpnl1" Orientation="Vertical">
<TextBox x:Name="txtSearch" Header="Filter" Margin="10"
PlaceholderText="Search list" TextChanging="TxtSearch_TextChanging" />
<ListView x:Name="lstView" Margin="30" Height="200"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollMode="Enabled">
<ListView.ItemTemplate >
<DataTemplate x:DataType="mvsc:SelectedDataModel" >
<CheckBox x:Name="chkBox"
FlowDirection="LeftToRight"
Tag="{x:Bind Id, Mode=TwoWay}"
Content="{x:Bind Message, Mode=TwoWay}" IsChecked="{x:Bind IsFavorite,Mode=TwoWay}"
Checked="ChkBox_Checked" Unchecked="ChkBox_Unchecked" IsHitTestVisible="True"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="1" FlowDirection="LeftToRight" >
<Button x:Name="btnAdd" Content="Select" Click="BtnAdd_Click" Margin="10" />
<Button x:Name="btnCancel" Content="Close" Click="BtnCancel_Click"/>
</StackPanel>
</StackPanel>
</Border>
</Popup>
</Grid>
null
public sealed partial class MainPage : Page
{
public SelectedDataModel SelectedData
{
get { return (SelectedDataModel)GetValue(SelectedDataProperty); }
set { SetValue(SelectedDataProperty, value); }
}
// Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SelectedDataProperty =
DependencyProperty.Register("SelectedData", typeof(int), typeof(SelectedDataModel), null);
public AllDataModel AllDataList
{
get { return (AllDataModel)GetValue(AllDataListProperty); }
set { SetValue(AllDataListProperty, value); }
}
// Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc...
public static readonly DependencyProperty AllDataListProperty =
DependencyProperty.Register("AllDataList", typeof(int), typeof(AllDataModel), null);
List<SelectedDataModel> listData = new List<SelectedDataModel>();
List<SelectedDataModel> temp = new List<SelectedDataModel>();
List<SelectedDataModel> temp1 = new List<SelectedDataModel>();
List<SelectedDataModel> selectedData = new List<SelectedDataModel>();
public MainPage()
{
this.InitializeComponent();
lstView.ItemsSource = GetData();
//lstViewSelectedData.ItemsSource = GetSelectedData();
temp = listData;
}
public List<SelectedDataModel> GetData()
{
listData.Add(new SelectedDataModel { Id = 1, Message = "One" });
listData.Add(new SelectedDataModel { Id = 2, Message = "Two" });
listData.Add(new SelectedDataModel { Id = 3, Message = "Three" });
listData.Add(new SelectedDataModel { Id = 4, Message = "Four" });
listData.Add(new SelectedDataModel { Id = 5, Message = "Five" });
listData.Add(new SelectedDataModel { Id = 6, Message = "Six" });
listData.Add(new SelectedDataModel { Id = 7, Message = "Seven" });
listData.Add(new SelectedDataModel { Id = 8, Message = "Eight" });
return listData;
}
private async void BtnAdd_Click(object sender, RoutedEventArgs e)
{
if (selectedData.Count == 0)
{
ContentDialog dialog = new ContentDialog();
dialog.Title = "Not Selected";
dialog.Content = "Please Select Atlease One Entry";
dialog.CloseButtonText = "Close";
await dialog.ShowAsync();
}
else
{
lstViewSelectedData.ItemsSource = null;
var dt = selectedData;
lstViewSelectedData.ItemsSource = dt;
//this.selectedData.ForEach(x => x.IsFavorite = false);
//this.listData.ForEach(x => x.IsFavorite = false);
//temp1 = dt;
popup1.IsOpen = false;
//foreach (SelectedDataModel row in lstView.Items.ToList())
//{
// //CheckBox box = row.FindName("chkSelect") as CheckBox;
// if (row.IsFavorite == true)
// {
// row.IsFavorite = false;
// // listData.Remove(listData.First(X => X.Id == row.Id));
// //Logic to delete the row
// }
//}
for (int i = 0; i < lstView.Items.Count; i++)
{
ListViewItem lvi = (ListViewItem)lstView.ItemContainerGenerator.ContainerFromItem(lstView.Items[i]);
if (lvi != null)
{
//CheckBox c = lvi.FindChildByType<CheckBox>();
//c.IsChecked = true;
}
}
}
}
private void TxtSearch_TextChanging(TextBox sender, TextBoxTextChangingEventArgs args)
{
listData = temp;
if (!string.IsNullOrEmpty(txtSearch.Text))
{
listData = listData.Where(x => x.Message.ToUpper().Contains(txtSearch.Text.ToUpper())).ToList();
if (listData.Count > 0)
{
lstView.ItemsSource = listData;
}
else
{
lstView.ItemsSource = temp;
}
}
else
{
lstView.ItemsSource = temp;
}
}
private void ChkBox_Checked(object sender, RoutedEventArgs e)
{
var chkBox = sender as CheckBox;
//throwing an exception System.NullReferenceException: 'Object reference not set to an instance of an object.'
selectedData.Add(listData.First(x => x.Id == int.Parse(chkBox.Tag.ToString())));
// listData.Remove(listData.First(X => X.Id == int.Parse(chkBox.Tag.ToString())));
//selectedData.Clear();
}
private void ChkBox_Unchecked(object sender, RoutedEventArgs e)
{
var chkBox = sender as CheckBox;
selectedData.Remove(listData.First(X => X.Id == int.Parse(chkBox.Tag.ToString())));
}
private void BtnAddData_Click(object sender, RoutedEventArgs e)
{
//popup2.IsOpen = false;
popup1.IsOpen = true;
}
private void BtnCancel_Click(object sender, RoutedEventArgs e)
{
popup1.IsOpen = false;
}
private void Btn_Add_Click(object sender, RoutedEventArgs e)
{
popup1.IsOpen = true;
}
private async void AppBarButton_Click(object sender, RoutedEventArgs e)
{
AppBarButton delButton = sender as AppBarButton;
ContentDialog dialog = new ContentDialog();
dialog.Content = "Do You Want To Remove..?";
dialog.PrimaryButtonText = "Yes";
dialog.SecondaryButtonText = "No";
dialog.Title = "Remove";
ContentDialogResult result = await dialog.ShowAsync();
if (result == ContentDialogResult.Primary)
{
//var isRemoved = temp.Remove(listData.First(x => x.id == int.Parse(delButton.Tag.ToString())));
//List<Info> temp1 = new List<Info>();
//foreach (var item in temp)
//{
// temp1.Add(item);
//}
//lstViewSelectedData.ItemsSource = temp1;
var temp2 = selectedData;
temp2.Remove(temp1.First(x => x.Id == int.Parse(delButton.Tag.ToString())));
lstViewSelectedData.ItemsSource = null;
lstViewSelectedData.ItemsSource = temp2;
}
}
}
我只想在按钮点击事件UWP上清除listview中的选中项。
共有1个答案
宦子琪
我尝试过循环listview并将property设置为false，但这不起作用。
您的复选框绑定到IsFavorite属性。因此，如果要取消选中，只需更新IsFavorite属性的值。若要在属性值更改时更新UI，SelectedDataModel类需要实现INotifyPropertyChanged接口。
public class SelectedDataModel : INotifyPropertyChanged
{
private int _Id;
public int Id
{
get { return _Id; }
set
{
if (_Id != value)
{
_Id = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Id"));
}
}
}
private string _Message;
public string Message
{
get { return _Message; }
set
{
if (_Message != value)
{
_Message = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Message"));
}
}
}
private bool _IsFavorite;
public bool IsFavorite
{
get { return _IsFavorite; }
set
{
if (_IsFavorite != value)
{
_IsFavorite = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("IsFavorite"));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
然后，在button click事件处理程序中，只需将ListData中每个项的IsFavorite更改为false。
foreach (var item in listData)
{
item.IsFavorite = false;
}
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