关于WPF WriteableBitmap类直接操作像素点的问题

WPF（Windows Presentation Foundation）是微软推出的基于Windows 的用户界面框架，属于.NET Framework 3.0的一部分。它提供了统一的编程模型、语言和框架，真正做到了分离界面设计人员与开发人员的工作；同时它提供了全新的多媒体交互用户图形界面。

还是话不多说，直接上码：

1.新建WpfApp应用程序

2.MainWindow.xaml文件代码如下：

<Window x:Class="WpfApp1.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:WpfApp1"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800">    <Grid><Grid.RowDefinitions>    <RowDefinition Height="*"></RowDefinition>    <RowDefinition Height="10*" ></RowDefinition></Grid.RowDefinitions> <Button Name="button" Grid.Row="0" HorizontalAlignment="Center" Content="generate_bitmap" MinWidth="120"  MinHeight="30" Click="Button_Click"></Button><Grid x:Name="imgGrid" Grid.Row="1">    <Viewbox><Image x:Name="img"  Width="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelWidth}"       Height="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelHeight}"Source="{Binding CtrlImage, IsAsync=True}"      Stretch="None" />    </Viewbox></Grid>    </Grid></Window>

3.MainWindow.xaml.cs文件代码如下：

using System;using System.Collections.Generic;using System.Globalization;using System.Linq;using System.Text;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;using System.Drawing;using System.Drawing.Drawing2D; namespace WpfApp1{    /// <summary>    /// Interaction logic for MainWindow.xaml    /// </summary>    public partial class MainWindow : Window    {public MainWindow(){    InitializeComponent();}public void Button_Click(object sender, RoutedEventArgs e)    WriteableBitmap wb = new WriteableBitmap((int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight, 96, 96, PixelFormats.Pbgra32, null);    wb.Lock();    Bitmap backBitmap = new Bitmap((int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight, wb.BackBufferStride, System.Drawing.Imaging.PixelFormat.Format32bppArgb, wb.BackBuffer);    Int32Rect rect = new Int32Rect(0, 0, (int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight);    byte[] pixels = new byte[(int)imgGrid.ActualWidth * (int)imgGrid.ActualHeight * wb.Format.BitsPerPixel / 8];    Random rand = new Random();    for (int y = 0; y < wb.PixelHeight; y++)    {for (int x = 0; x < wb.PixelWidth; x++){    int alpha = 0;    int red = 0;    int green = 0;    int blue = 0;    if ((x % 5 == 0) || (y % 7 == 0))    {red = (int)((double)y / wb.PixelHeight * 255);green = rand.Next(100, 255);blue = (int)((double)x / wb.PixelWidth * 255);alpha = 255;    }    elsered = (int)((double)x / wb.PixelWidth * 255);blue = (int)((double)y / wb.PixelHeight * 255);alpha = 50;    int pixeloffset = (x + y * wb.PixelWidth) * wb.Format.BitsPerPixel / 8;    pixels[pixeloffset] = (byte)blue;    pixels[pixeloffset + 1] = (byte)green;    pixels[pixeloffset + 2] = (byte)red;    pixels[pixeloffset + 3] = (byte)alpha;}int stride = (wb.PixelWidth * wb.Format.BitsPerPixel) / 8;wb.WritePixels(rect, pixels, stride, 0);    }    wb.Unlock();    backBitmap.Dispose();    backBitmap = null;    img.Source = wb;    }}

　　效果如下：

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