无法加载系统数据
我有点困惑为什么会发生这种情况。我一直运行得很好——做了一些更改/重建（构建得很好），突然间，无论我做什么，当我尝试调试时，我都会遇到以下异常。
无法加载文件或程序集 '系统数据，版本=2.0.0.0， 文化=中立， PublicKeyToken=b77a5c561934e089' 或 它的依赖项之一。系统 找不到指定的文件。
有什么想法如何让它恢复到以前的样子吗？我什至撤消了我所做的更改（这实际上不应该与此有任何关系），但无济于事。
I am a little baffled as to why this is occurring. I have been cruising along just fine -- made a couple changes / rebuilt (builds just fine) and all of a sudden no matter what I do I get the following exception when I try to debug..
Could not load file or assembly
'System.Data, Version=2.0.0.0,
Culture=neutral,
PublicKeyToken=b77a5c561934e089' or
one of its dependencies. The system
cannot find the file specified.
Any ideas how to get this back to how it was before? I even undid the changes I made (that really shouldn't have had anything to do with this) to no avail.
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如果“Windows”更新最近修补了您引用的 .NET Framework 版本，编译器可能会认为存在版本控制差异。
如果是这种情况，请尝试重新启动，并可能重新检查更新。如果失败，请重新安装 .net Framework 版本，并重新应用更新。在安装了 XNA 4.0 的试用版然后将其卸载后，我对另一个系统组件也遇到了类似的问题。
If a "Windows" update recently patched the .NET framework version you're referencing, the compiler may think there's a versioning difference.
If this were the case, try rebooting, and possibly re-checking updates. Failing that, re-installing the .net framework version, and letting the updates get re-applied. I had a similar issue with another System component after once installing a trial version of XNA 4.0, and then uninstalling it.
确保您仍将 System.Data 添加为项目引用。如果是这样，请确保存在 Visual Studio 并返回。然后执行“清理”和“构建”，您应该可以开始了。
Ensure that you have System.Data still added as a project reference. If so, be sure to then exist Visual Studio and go back in. Then do a "clean" and "Build" and you should be set to go.