c# - 无法加载文件或程序集“System.Data”

Question

我收到此错误：

Could not load file or assembly 'System.Data' or one of its dependencies

这是我在 Web.Config 中的代码。

<add assembly="System.Data" />

程序集加载跟踪：以下信息有助于确定无法加载程序集“System.Data”的原因。

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

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版本信息：Microsoft .NET Framework 版本：4.0.30319；ASP.NET 版本：4.0.30319.272

你能帮我弄清楚我做错了什么吗？谢谢