wpf看图软件代码

WPF 看图软件的代码比较复杂，需要涉及到图像处理、界面设计、文件操作等多个方面。以下是一个简单的 WPF 看图软件的代码示例，供参考：

MainWindow.xaml：

<Window x:Class="ImageViewer.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Image Viewer" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Menu>
            <MenuItem Header="_File">
                <MenuItem Header="_Open" Click="MenuItemOpen_Click"/>
                <MenuItem Header="_Save" Click="MenuItemSave_Click"/>
                <Separator/>
                <MenuItem Header="_Exit" Click="MenuItemExit_Click"/>
            </MenuItem>
            <MenuItem Header="_View">
                <MenuItem Header="_Fit to Window" IsCheckable="True" Click="MenuItemFitToWindow_Click"/>
                <Separator/>
                <MenuItem Header="_Zoom In" Click="MenuItemZoomIn_Click"/>
                <MenuItem Header="_Zoom Out" Click="MenuItemZoomOut_Click"/>
                <Separator/>
                <MenuItem Header="_Actual Size" Click="MenuItemActualSize_Click"/>
            </MenuItem>
            <MenuItem Header="_Help">
                <MenuItem Header="_About" Click="MenuItemAbout_Click"/>
            </MenuItem>
        </Menu>
        <StatusBar Grid.Row="1" Height="20"/>
        <ScrollViewer Grid.Row="1" Name="ImageScrollViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
            <Image Name="ImageView" Stretch="None"/>
        </ScrollViewer>
    </Grid>
</Window>

MainWindow.xaml.cs：

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

namespace ImageViewer
{
    public partial class MainWindow : Window
    {
        private BitmapImage _bitmap;
        private double _zoomFactor = 1.0;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void MenuItemOpen_Click(object sender, RoutedEventArgs e)
        {
            var openFileDialog = new Microsoft.Win32.OpenFileDialog();
            openFileDialog.Filter = "Image Files (*.bmp, *.jpg, *.png)|*.bmp;*.jpg;*.png";
            if (openFileDialog.ShowDialog() == true)
            {
                try
                {
                    _bitmap = new BitmapImage(new Uri(openFileDialog.FileName));
                    ImageView.Source = _bitmap;
                    UpdateZoomFactor();
                    StatusText.Content = openFileDialog.FileName;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
        }

        private void MenuItemSave_Click(object sender, RoutedEventArgs e)
        {
            if (_bitmap != null)
            {
                var saveFileDialog = new Microsoft.Win32.SaveFileDialog();
                saveFileDialog.Filter = "BMP Files (*.bmp)|*.bmp|JPEG Files (*.jpg)|*.jpg|PNG Files (*.png)|*.png";
                if (saveFileDialog.ShowDialog() == true)
                {
                    try
                    {
                        var encoder = GetBitmapEncoder(saveFileDialog.FileName);
                        encoder.Frames.Add(BitmapFrame.Create(_bitmap));
                        using (var stream = new FileStream(saveFileDialog.FileName, FileMode.Create))
                        {
                            encoder.Save(stream);
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                    }
                }
            }
        }

        private BitmapEncoder GetBitmapEncoder(string fileName)
        {
            switch (Path.GetExtension(fileName).ToUpper())
            {
                case ".BMP":
                    return new BmpBitmapEncoder();
                case ".JPG":
                    return new JpegBitmapEncoder();
                case ".PNG":
                    return new PngBitmapEncoder();
                default:
                    throw new NotSupportedException("Unsupported file format.");
            }
        }

        private void MenuItemExit_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }

        private void MenuItemFitToWindow_Click(object sender, RoutedEventArgs e)
        {
            if (_bitmap != null)
            {
                if (MenuItemFitToWindow.IsChecked)
                {
                    ImageView.Stretch = Stretch.Uniform;
                }
                else
                {
                    ImageView.Stretch = Stretch.None;
                }
            }
        }

        private void MenuItemZoomIn_Click(object sender, RoutedEventArgs e)
        {
            if (_bitmap != null)
            {
                _zoomFactor *= 1.1;
                UpdateZoomFactor();
            }
        }

        private void MenuItemZoomOut_Click(object sender, RoutedEventArgs e)
        {
            if (_bitmap != null)
            {
                _zoomFactor /= 1.1;
                UpdateZoomFactor();
            }
        }

        private void MenuItemActualSize_Click(object sender, RoutedEventArgs e)
        {
            if (_bitmap != null)
            {
                _zoomFactor = 1.0;
                UpdateZoomFactor();
            }
        }

        private void UpdateZoomFactor()
        {
            if (_bitmap != null)
            {
                ImageView.Width = _bitmap.PixelWidth * _zoomFactor;
                ImageView.Height = _bitmap.PixelHeight * _zoomFactor;
            }
        }

        private void MenuItemAbout_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Image Viewer\r\n(C) 2021 WPF Sample", "About", MessageBoxButton.OK, MessageBoxImage.Information);
        }

        private void ImageView_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (_bitmap != null)
            {
                if (Keyboard.Modifiers == ModifierKeys.Control)
                {
                    if (e.Delta > 0)
                    {
                        _zoomFactor *= 1.1;
                    }
                    else
                    {
                        _zoomFactor /= 1.1;
                    }
                    e.Handled = true;
                    UpdateZoomFactor();
                }
            }
        }
    }
}

这个简单的 WPF 看图软件实现了打开和保存图像文件、缩放、显示当前图像文件路径等功能。但是它还有很多不足之处，例如没有实现图像的旋转、翻转、裁剪等功能，也没有实现图像的拖放、缩略图、分页浏览等高级功能。如果需要实现更复杂的功能，就需要更多的代码和技术。