Question

当我的.NET Core应用程序运行时，我注意到以下行：

fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[0]
      An unhandled exception has occurred: Method 'Clone' in type 'Microsoft.EntityFrameworkCore.Infrastructure.Internal.SqlServerOptionsExtension' from assembly 'Microsoft.EntityFrameworkCore.SqlServer, Version=1.1.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' does not have an implementation. System.TypeLoadException: Method 'Clone' in type 'Microsoft.EntityFrameworkCore.Infrastructure.Internal.SqlServerOptionsExtension' from assembly 'Microsoft.EntityFrameworkCore.SqlServer, Version=1.1.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' does not have an implementation.

我只是好奇导致此错误的原因是因为我的应用程序仍然正常运行，尽管出现错误消息。

顺便说一句，我使用的是.NET Core 2.0.0 Preview 1版本。

Answer 1

Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware只是在程序中没有执行其他操作时捕获异常的中间件

因此，您的“真实”例外是 Method 'Clone' in type 'Microsoft.EntityFrameworkCore.Infrastructure.Internal.SqlServerOptionsExtension' from assembly 'Microsoft.EntityFrameworkCore.SqlServer, ...' does not have an implementation

通过对此异常进行一些谷歌搜索，似乎可以支持您的.Net Core版本与EF Provider

如果您想了解更多信息，可以：

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/error-handling?view=aspnetcore-2.1#the-developer-exception-page启用开发人员例外页面
从EF登录更多信息（https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?view=aspnetcore-2.1#add-providers =>在跟踪模式下启用将为您提供更多信息）

失败：Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware [0]

1 个答案: