前几天看园子有篇文章介绍Visual Studio Async
觉得不错想试试效果，上MS网站下载安装包装下
地址：http://www.microsoft.com/download/en/details.aspx?id=9983
（可以在wp7上用的哦）
Overview
The original Async CTP from PDC 10 brought asynchronous programming to C# and Visual Basic in Visual Studio 2010. This refresh introduces the following:
- Compatible with Visual Studio 2010 SP1, which is now required.
- Compatible with non-English installations of Visual Studio and with Visual Studio Express.
- Enables asynchronous development for Windows Phone 7.
- Includes various bug-fixes and changes, detailed in the Readme and documentation.
- Includes a new EULA for production use. Note - This license does not constitute encouragement for you to use the CTP for your production code. The CTP remains an unsupported and use-at-your-own-risk Technology Preview. However, we’ve received many requests from developers to use the CTP for production code, and so have changed the license to allow that.
下载安装
安装完成后，杯具了…
“我的文档”里死活找不到传说中的“Microsoft Visual Studio Async CTP”文件夹…
上ＭＳＤＮ论坛，发现多人也有这个情况，找到篇解决方法：
http://social.msdn.microsoft.com/Forums/en-US/async/thread/e63a036d-f79d-4904-8e88-97d4dd152cb1
是因为装了KB2565057
果断卸载，结果依然失败．．．
看上面那篇的分析：
运行：msiexec /p VS10-KB0000001.msp SHORTFILENAMES=TRUE /qb /L* c:\Temp\log.txt
查看日志：
MSI (s) (B0:48) [22:20:12:635]: Final Patch Application Order:
MSI (s) (B0:48) [22:20:12:635]: {FC8EA2A2-65A3-366E-A687-5B63943A800F} -
MSI (s) (B0:48) [22:20:12:635]: {FD1050C2-7614-3245-83F1-6B0BE4769064} -
MSI (s) (B0:48) [22:20:12:635]: Other Patches:
MSI (s) (B0:48) [22:20:12:635]: Superseded: {50BE1560-55E5-31CB-AC52-8403B409E46C} - C:\cc78c6b4d0885ab3cd39e29163\VS10-KB0000001.msp
MSI (s) (B0:48) [22:20:12:635]: Superseded: {11195581-0A34-371D-9FB5-F07DE684FDE6} -
……
应该还是有补丁不兼容
重装下KB2565057 （200多M），发现同时vs的其他几个补丁的更新日期也变了
把这几个统统卸载
再次运行命令行，查看日志：
MSI (s) (B8:F8) [21:48:36:475]: Final Patch Application Order:
MSI (s) (B8:F8) [21:48:36:475]: {FC8EA2A2-65A3-366E-A687-5B63943A800F} -
MSI (s) (B8:F8) [21:48:36:475]: {11195581-0A34-371D-9FB5-F07DE684FDE6} -
MSI (s) (B8:F8) [21:48:36:475]: {25961B77-62ED-3599-8618-3A0304110026} -
MSI (s) (B8:F8) [21:48:36:475]: {296218F5-C5A1-3CFE-B3A9-4EF40F5475B4} -
MSI (s) (B8:F8) [21:48:36:475]: {4733D286-44DF-3445-BF68-CBEB4AF97622} -
MSI (s) (B8:F8) [21:48:36:475]: {50BE1560-55E5-31CB-AC52-8403B409E46C} - F:\Xunlei\Async-CTP1\VS10-KB0000001.msp
MSI (s) (B8:F8) [21:48:36:475]: {A1339082-2C37-3126-AE03-9C3E10AA239B} -
现在在装就没有问题了
安装完成后可以在更新里看到
更多关于Visual Studio Async可以看看：
http://www.abhisheksur.com/2011/04/async-support-for-silverlight-and-wp7.html
安装失败的兄弟们可以考虑把那几个补丁挨个卸载试试
（可能不用全卸载，没卸载完用命令行试试把…）