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：

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{    /// 
    /// Interaction logic for MainWindow.xaml    /// 
    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;                    }                    else                        red = (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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