Question

学习WPF并来自Windows表单！

我目前正在执行以下操作来加载数据库，但是我还想知道如何将复选框绑定到列表视图项的选定事件，并在单击按钮后从sqlite数据库和列表视图中删除所选行。

编辑：感谢AVK Naidu的帮助，它现在正在运作！

   public ObservableCollection<MyItem> myItems { get; set; }
   public class MyItem
    {
        public string Key { get; set; }
        public string Key1 { get; set; }
        public string Key2 { get; set; }
        public string Key3 { get; set; }
        public bool IsSelected { get; set; }
    }
    private void LoadDatabaseButton_Click(object sender, RoutedEventArgs e)
    {
        myItems = new ObservableCollection<MyItem>();
        SQLiteConnection m_dbConnection;
        m_dbConnection = new SQLiteConnection("Data Source=MyDatabase.sqlite;Version=3;");
        m_dbConnection.Open();
        SQLiteCommand readdatabase = new SQLiteCommand("Select * From TableName", m_dbConnection);
        using (SQLiteDataReader read = readdatabase.ExecuteReader())
        {
            while (read.Read())
            {
                listView4.Items.Add(new MyItem { Key = read["Key"].ToString(), Key2 = read["Key2"].ToString(), Key3 = read["Key3"].ToString(), Key4 = read["Key4"].ToString() });
            }
        }
        m_dbConnection.Close();
    }

这是我在XAML中用于加载数据库的列表视图：

<ListView x:Name="listView4" HorizontalAlignment="Left" Height="186" VerticalAlignment="Top" Width="432" BorderBrush="Gray">
    <ListView.View>
        <GridView>
          <GridViewColumn Header="Key" DisplayMemberBinding="{Binding Key}"/>
          <GridViewColumn Header="Key1" DisplayMemberBinding="{Binding Key1}"/>
          <GridViewColumn Header="Key2" DisplayMemberBinding="{Binding Key2}"/>
          <GridViewColumn Header="Key3" DisplayMemberBinding="{Binding Key3}"/>

        </GridView>
    </ListView.View>
      </ListView>

从数据库中删除：

        private void RemoveRowButton_click(object sender, RoutedEventArgs e)
    {

        foreach (var Checkboxitem in myItems)
        {
                if (Checkboxitem.IsSelected == true)
                {
                    MessageBox.Show(Checkboxitem.Key.ToString() + Checkboxitem.Key1.ToString() + Checkboxitem.Key2.ToString() + Checkboxitem.Key3.ToString());
                }

        }
    }

Answer 1

将您的MyItem更改为以下。

public class MyItem
{
    public bool IsSelected { get; set; }
    public string Key { get; set; }
    public string Key1 { get; set; }
    public string Key2 { get; set; }
    public string Key3 { get; set; }
}

在GridView中添加CheckBox列。你的ListView将类似于下面。

<ListView x:Name="listView4" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderBrush="Gray">
    <ListView.View>
        <GridView>
            <GridViewColumn>
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <CheckBox IsChecked="{Binding IsSelected, Mode=TwoWay}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Header="Key" DisplayMemberBinding="{Binding Key}"/>
            <GridViewColumn Header="Key1" DisplayMemberBinding="{Binding Key1}"/>
            <GridViewColumn Header="Key2" DisplayMemberBinding="{Binding Key2}"/>
            <GridViewColumn Header="Key3" DisplayMemberBinding="{Binding Key3}"/>               
        </GridView>
    </ListView.View>
</ListView>

如果你从CheckBox查看GridViewColumn.CellTemplate，我就使用了Mode = TwoWay，以便它可以更新从中绑定数据的集合。

所以对于如下的样本数据，

myItems = new ObservableCollection<MyItem>();
for (int i = 0; i < 20; i++)
{
    myItems.Add(new MyItem() { Key = i.ToString(), Key2 = i.ToString(), Key1 = i.ToString(), Key3 = i.ToString(), IsSelected = false });
}
listView4.ItemsSource = myItems;

如果您在删除按钮上重新访问myItems，则可以看到，如果选中该复选框，您的实际收藏集IsSelected将更新为true。现在，您可以遍历集合并删除IsSelected为true的

Listview带有用于删除sqlite行的复选框？ WPF，C＃

1 个答案: