相关疑难解决方法(0)

我有以下示例代码,每次按下按钮时缩放:

XAML:

<Window x:Class="WpfApplication12.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">

    <Canvas x:Name="myCanvas">

        <Canvas.LayoutTransform>
            <ScaleTransform x:Name="myScaleTransform" />
        </Canvas.LayoutTransform> 

        <Button Content="Button" 
                Name="myButton" 
                Canvas.Left="50" 
                Canvas.Top="50" 
                Click="myButton_Click" />
    </Canvas>
</Window>

*的.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void myButton_Click(object sender, RoutedEventArgs e)
    {
        Console.WriteLine("scale {0}, location: {1}", 
            myScaleTransform.ScaleX,
            myCanvas.PointToScreen(GetMyByttonLocation()));

        myScaleTransform.ScaleX =
            myScaleTransform.ScaleY =
            myScaleTransform.ScaleX + 1;

        Console.WriteLine("scale {0}, location: {1}",
            myScaleTransform.ScaleX,
            myCanvas.PointToScreen(GetMyByttonLocation()));
    }

    private Point GetMyByttonLocation()
    {
        return new Point(
            Canvas.GetLeft(myButton),
            Canvas.GetTop(myButton));
    }
}

输出是:

scale 1, location: …

我有一些奇怪的行为,我似乎无法解决.当我遍历ListBox.ItemsSource属性中的项目时,我似乎无法获取容器？我期待看到一个ListBoxItem返回,但我只得到null.

有任何想法吗？

这是我正在使用的一些代码:

this.lstResults.ItemsSource.ForEach(t =>
    {
        ListBoxItem lbi = this.lstResults.ItemContainerGenerator.ContainerFromItem(t) as ListBoxItem;

        if (lbi != null)
        {
            this.AddToolTip(lbi);
        }
    });

ItemsSource当前设置为Dictionary并且包含许多KVP.

我有下一个代码,我定义了一个名为dgQuery的WPF工具包数据网格控件; 我用数据集的信息填充了这个,然后我在dgQuery中插入了一个新的复选框列来检查/取消选中某些行,我展示了部分C#代码:

dgQuery.DataContext = dS.Tables[0];

DataGridTemplateColumn cbCol = new DataGridTemplateColumn();
cbCol.Header = "Opc";
FrameworkElementFactory factory = new FrameworkElementFactory(typeof(CheckBox));
Binding bind = new Binding("IsSelected");
bind.Mode = BindingMode.TwoWay;
factory.SetValue(CheckBox.IsCheckedProperty, bind);
DataTemplate cellTemplate = new DataTemplate();
cellTemplate.VisualTree = factory;
cbCol.CellTemplate = cellTemplate;
dgQuery.Columns.Insert(0, cbCol);

在检查/取消选中dgQuery行的新复选框列后,我将单击一个按钮,仅将我检查的行保存到数据库中.问题是,如何开发用于读取dgQuery的所有行的循环以及让我知道哪些行具有选中/取消选中复选框的条件？请帮我举个例子.

谢谢!!