c# - 获取错误 "The ' targetFramework' 属性当前引用的版本高于已安装的 .NET Framework 版本”

Question

我已经在 IIS7 服务器上发布了一个 ASP.NET Web API。当我在本地测试它时。我收到以下框架错误:

Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: The 'targetFramework' attribute in the <compilation> element of the Web.config file is used only to target version 4.0 and later of the .NET Framework (for example, '<compilation targetFramework="4.0">'). The 'targetFramework' attribute currently references a version that is later than the installed version of the .NET Framework. Specify a valid target version of the .NET Framework, or install the required version of the .NET Framework.

Source Error:

Line 20: </appSettings>
Line 21: <system.web>
Line 22: <compilation targetFramework="4.5" />
Line 23: <httpRuntime targetFramework="4.5" />
Line 24: <authentication mode="None" />

我不太确定哪里出了问题，因为我有一个使用框架 4.0 在服务器上运行的 ASP.NET 网站。

Answer 1

从 here 下载 .NET 4.5安装成功后运行命令提示符(以管理员身份)并定位到这个地址:

%windir%\Microsoft.NET\Framework\v4.0.30319

现在运行这个命令:

aspnet_regiis -iru