我要评论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;
}
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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