WPF使用WriteableBitmap更新图像

 

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="400" Width="400">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Button x:Name="Btn" Content="更新图像" Click="BtnClkUpdateImage"></Button>
        <Image Name="Img" Grid.Row="1"/>
    </Grid>
</Window>

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace WpfApp2
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private WriteableBitmap _wbBitmap;
        int width = 1000;
        int height = 1000;
        int length = 0;    
        short[] dates;
        public MainWindow()
        {
            InitializeComponent();
            length = width * height;
            _wbBitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Gray16, null);
            Img.Source = _wbBitmap;
            dates = new short[length];
        }
        public void ShowImage(short[] rawData)
        {
            unsafe
            {
                _wbBitmap.Lock();
                Marshal.Copy(rawData, 0, _wbBitmap.BackBuffer, length);
                _wbBitmap.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width, height)); 
                _wbBitmap.Unlock();
            }
        }
        private void BtnClkUpdateImage(object sender, RoutedEventArgs e)
        {
            //随机产生图像数据
            Random ran;
            for (int i = 0; i < length; i++) {
                ran = new Random();
                dates[i] = (short)ran.Next(65535);
            }
            Btn.IsEnabled = false;
            Task task = Task.Run(() =>
            {
                while (true)
                {
                    Array.Reverse(dates);// 逆转数组
                    Img.Dispatcher.Invoke(new Action(() => 
                    {
                        ShowImage(dates);
                    }));
                    Thread.Sleep(1);
                }
            });
        }
    }
}

 更新大图可以把图像分开使用多任务更新

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp2 {
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window {
        private WriteableBitmap _wbBitmap1;
        private WriteableBitmap _wbBitmap2;
        private WriteableBitmap _wbBitmap3;
        private WriteableBitmap _wbBitmap4;
        int width = 8000;
        int height = 8000;
        int length = 0;
        short[] dates;
        short[] date1;
        short[] date2;
        short[] date3;
        short[] date4;
        public MainWindow() {
            InitializeComponent();
            length = width * height;
            _wbBitmap1 = new WriteableBitmap(width / 4, height / 4, 96, 96, PixelFormats.Gray16, null);
            Img1.Source = _wbBitmap1;
            _wbBitmap2 = new WriteableBitmap(width / 4, height / 4, 96, 96, PixelFormats.Gray16, null);
            Img2.Source = _wbBitmap2;
            _wbBitmap3 = new WriteableBitmap(width / 4, height / 4, 96, 96, PixelFormats.Gray16, null);
            Img3.Source = _wbBitmap3;
            _wbBitmap4 = new WriteableBitmap(width / 4, height / 4, 96, 96, PixelFormats.Gray16, null);
            Img4.Source = _wbBitmap4;
            dates = new short[length];
            date1 = new short[width / 4 * height / 4];
            date2 = new short[width / 4 * height / 4];
            date3 = new short[width / 4 * height / 4];
            date4 = new short[width / 4 * height / 4];
        }
        public void ShowImage1(short[] rawData) {
            unsafe {
                _wbBitmap1.Lock();
                Marshal.Copy(rawData, 0, _wbBitmap1.BackBuffer, width / 4 * height / 4);
                _wbBitmap1.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width / 4, height / 4));
                _wbBitmap1.Unlock();
            }
        }
        public void ShowImage2(short[] rawData) {
            unsafe {
                _wbBitmap2.Lock();
                Marshal.Copy(rawData, 0, _wbBitmap2.BackBuffer, width / 4 * height / 4);
                _wbBitmap2.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width / 4, height / 4));
                _wbBitmap2.Unlock();
            }
        }
        public void ShowImage3(short[] rawData) {
            unsafe {
                _wbBitmap3.Lock();
                Marshal.Copy(rawData, 0, _wbBitmap3.BackBuffer, width / 4 * height / 4);
                _wbBitmap3.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width / 4, height / 4));
                _wbBitmap3.Unlock();
            }
        }
        public void ShowImage4(short[] rawData) {
            unsafe {
                _wbBitmap4.Lock();
                Marshal.Copy(rawData, 0, _wbBitmap4.BackBuffer, width / 4 * height / 4);
                _wbBitmap4.AddDirtyRect(new System.Windows.Int32Rect(0, 0, width / 4, height / 4));
                _wbBitmap4.Unlock();
            }
        }
        private void BtnClkUpdateImage(object sender, RoutedEventArgs e) {
            //随机产生图像数据
            Random ran;
            for (int i = 0; i < length; i++) {
                ran = new Random();
                dates[i] = (short)ran.Next(65535);
            }
            Btn.IsEnabled = false;
            Task task = Task.Run(() => {
                while (true) {
                    Array.Reverse(dates);// 逆转数组
                    Thread.Sleep(100);
                }
            });
            Task task1 = Task.Run(() => {
                while (true) {
                    Array.Copy(dates, date1, width / 4 * height / 4);
                    Img1.Dispatcher.BeginInvoke(new Action(() => {
                        ShowImage1(date1);
                    }));
                    Thread.Sleep(100);
                }
            });
            Task task2 = Task.Run(() => {
                while (true) {
                    Array.Copy(dates, width / 4 * height / 4, date2,0, width / 4 * height / 4);
                    Img2.Dispatcher.BeginInvoke(new Action(() => {
                        ShowImage2(date2);
                    }));
                    Thread.Sleep(100);
                }
            });
            Task task3 = Task.Run(() => {
                while (true) {
                    Array.Copy(dates, width / 4 * height / 4, date3, 0, width / 4 * height / 4);
                    Img3.Dispatcher.BeginInvoke(new Action(() => {
                        ShowImage3(date3);
                    }));
                    Thread.Sleep(100);
                }
            });
            Task task4 = Task.Run(() => {
                while (true) {
                    Array.Copy(dates, width / 4 * height / 4, date4, 0, width / 4 * height / 4);
                    Img4.Dispatcher.BeginInvoke(new Action(() => {
                        ShowImage4(date4);
                    }));
                    Thread.Sleep(100);
                }
            });
        }
    }
}

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="400" Width="400">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Button x:Name="Btn" Content="更新图像" Click="BtnClkUpdateImage"></Button>
        <Grid Grid.Row="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Image Name="Img1" Grid.Row="0" HorizontalAlignment="Right" VerticalAlignment="Bottom" />
            <Image Name="Img2" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Bottom"/>
            <Image Name="Img3" Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Top"/>
            <Image Name="Img4" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        </Grid>

    </Grid>
</Window>