相关疑难解决方法(0)

我已经整理了一个简单的WPF应用程序来演示我遇到的问题.我的XAML如下:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="427" Width="467" Loaded="MainWindow_OnLoaded">
    <Grid>
        <ScrollViewer Name="MyScrollViewer" CanContentScroll="True">
            <Image Name="MyImage" HorizontalAlignment="Left" VerticalAlignment="Top" MouseWheel="UIElement_OnMouseWheel" MouseDown="MyImage_OnMouseDown" MouseUp="MyImage_OnMouseUp"/>
        </ScrollViewer>
    </Grid>
</Window>

代码隐藏如下:

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void UIElement_OnMouseWheel(object sender, MouseWheelEventArgs e)
        {
            var matrix = MyImage.RenderTransform.Value;

            if (e.Delta > 0)
            {
                matrix.ScaleAt(1.5, 1.5, e.GetPosition(this).X, e.GetPosition(this).Y);
            }
            else …