WPF下，高性能绘图，写WriteableBitmap，多线程，双缓存

这是一个在WPF下的绘图功能代码，能过写位图，实现顶级的绘图性能，多线程架构，项目代码完整，可直接运行。可以修改适用于自定义控件。

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace Wpfwritebitmap
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-03-29 08:14  Wpfwritebitmap\
     目录           0  2019-03-29 08:14  Wpfwritebitmap\.vs\
     目录           0  2019-03-29 08:14  Wpfwritebitmap\.vs\Wpfwritebitmap\
     目录           0  2019-03-29 08:14  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\
     文件       72192  2019-04-01 13:08  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\.suo
     目录           0  2019-03-29 08:14  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\
     目录           0  2019-03-31 00:33  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\sqlite3\
     文件           0  2019-03-29 08:14  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\sqlite3\db.lock
     文件      696320  2019-03-29 21:09  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\sqlite3\storage.ide
     文件       32768  2019-04-01 13:02  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\sqlite3\storage.ide-shm
     文件     1207192  2019-04-01 13:07  Wpfwritebitmap\.vs\Wpfwritebitmap\v15\Server\sqlite3\storage.ide-wal
     目录           0  2019-04-01 13:08  Wpfwritebitmap\Wpfwritebitmap\
     文件         187  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\App.config
     文件         382  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\App.xaml
     文件         341  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\App.xaml.cs
     文件        1003  2019-03-29 17:09  Wpfwritebitmap\Wpfwritebitmap\MainWindow.xaml
     文件        4265  2019-04-01 13:08  Wpfwritebitmap\Wpfwritebitmap\MainWindow.xaml.cs
     目录           0  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\
     文件        2322  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\AssemblyInfo.cs
     文件        2841  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\Resources.Designer.cs
     文件        5612  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\Resources.resx
     文件        1101  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\Settings.Designer.cs
     文件         201  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\Properties\Settings.settings
     文件        4162  2019-03-29 09:16  Wpfwritebitmap\Wpfwritebitmap\Wpfwritebitmap.csproj
     目录           0  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\bin\
     目录           0  2019-04-01 13:09  Wpfwritebitmap\Wpfwritebitmap\bin\Debug\
     目录           0  2019-03-29 08:14  Wpfwritebitmap\Wpfwritebitmap\obj\
     目录           0  2019-04-01 13:08  Wpfwritebitmap\Wpfwritebitmap\obj\Debug\
     文件        2345  2019-04-01 13:08  Wpfwritebitmap\Wpfwritebitmap\obj\Debug\App.g.i.cs
     文件         670  2019-03-31 19:28  Wpfwritebitmap\Wpfwritebitmap\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7388  2019-03-29 08:56  Wpfwritebitmap\Wpfwritebitmap\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
............此处省略8个文件信息