VS2010 + C#4.0使用 async + await

方法一： 安装官方出的Microsoft.Bcl.Async包

最新发布日期为 2014/4/12，版本1.0.168

（不支持VS2010）

1、解决方案-右键-管理解决方案的NuGet程序包

2、搜索Microsoft.Bcl.Async，点击安装

 3、等待下载完成

 

 4、点击我接受

 

 5、发现引用下多出7个引用

方法二、

2011年微软出了async的预览版，当时使用async的方式如下

1、准备好Visual Studio 2010 + SP1，无论什么版本。

VS2010 SP1升级补丁：

Microsoft Visual Studio 2010 Service Pack 1 官方离线下载版（ISO）1.48G地址：
http://download.microsoft.com/download/E/B/A/EBA0A152-F426-47E6-9E3F-EFB686E3CA20/VS2010SP1dvd1.iso

 

2、把Visual Studio Async CTP下载下来，并安装。

3、建个项目，现在你已经可以使用async和await关键字了，而诸如WebClient下的DownloadStringTaskAsync方法，则是在%MyDocument%Microsoft Visual Studio Async CTPSamplesAsyncCtpLibrary.dll下定义的扩展方法。

 

参考：下一代C#里的async和await

 

 

 

 

 

安装VS2010 SP1 升级程序

 

如果双击安装程序，出现的界面不是下面，而是标题出现XXX维护

则需要在注册表下，hkey_current_usersoftwaremicrosoftinstallerproducts

在Products下找到一个ProductName叫 Microsoft Visual Studio 2010 Service Pack 1的项，并删除掉项9AC087DE786021C34B9333962F4249F1

再次打开安装程序就正常了

安装完SP1后，打开弹框报错：未能正确加载 “Microsoft.Data.Entity.Design.BootstrapPackage.BootstrapPackage,”

reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

reg query HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query delete HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigPackages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

reg delete HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f 
reg delete HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f
reg delete HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /va /f 

reg delete HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f 
reg delete HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f
reg delete HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /va /f 

reg delete HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f 
reg delete HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /f
reg delete HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigPackages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /va /f 


reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0AutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio10.0Packages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

reg query HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{adfc4e66-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query delete HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigAutoLoadPackages{93694fa0-0397-11d1-9f4e-00a0c911004f} /v {7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} 
reg query HKEY_CURRENT_USERSOFTWAREMicrosoftVisualStudio10.0_ConfigPackages{7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB} /s

将上述代码复制到cmd下即可~如果一般不行来两遍。