问题描述
我有一个带有网站和几个项目库的 ASP.NET 5 解决方案.我正在使用 MVC 6 和 Entity Framework 7.该应用程序在本地运行良好，直到今天它还在作为 Azure 网站部署的 Azure 上运行.
I have an ASP.NET 5 solution with a website and several project libraries. I'm using MVC 6 and Entity Framework 7. Locally the app is working fine and until today it was working also on Azure deployed as an Azure Website.
但是今天在 Azure 上进行最新部署后，我在启动时收到了这样的错误 500(在本地仍然可以正常工作):
But today after the latest deployment on Azure I got an error 500 like this on the startup (still working fine locally):
我试图通过以下方式获取更多详细信息:
I tried to get more details by :
- 使用中间件诊断
- 在 web.config 文件中添加 customError/httpError 设置
- 下载生成的DetailedError页面
似乎在启动/配置步骤期间发生了错误/异常，但我仍然收到没有详细信息的通用错误页面.即使是在服务器上生成的版本(DetailedErrors 文件夹)我也得到了这个:
It seems that the error/exception is happening during the Startup/Configure step but I'm still getting the generic error page without details. Even the version generated on the server (DetailedErrors folder) I got this:
我启用了失败的请求跟踪，但仍然没有有用的信息:
I enabled the Failed Request Tracing but still no useful information:
即使我在 Startup/Configure 中删除代码并按照建议添加 try/catch，我也会得到相同的错误，但没有详细信息.这似乎是一个配置/编译问题，但在没有任何信息的情况下很难调试.
Even if I strip down the code in the Startup/Configure and add a try/catch as suggested I got the same error without détails. It seems to be a configuration/compilation issue but hard to debug without any information.
推荐答案
在 RC1(可能是 beta8)中，显然应该使用:
In RC1 (as of beta8, perhaps), one should apparently use:
app.UseDeveloperExceptionPage();
.. 这显然只有在 app.Properties["host.AppMode"] 是 "development" 时才有效.
.. which apparently only works if app.Properties["host.AppMode"] is "development".
但这对我不起作用.我收到的错误消息是启动应用程序时发生错误"，我发现没有一个给定的配置可以解决这个问题，因为错误是在配置执行之前发生的.
But this didn't work for me. The error message I was getting was specifically "An error occurred while starting the application", I have found that none of the given configurations will resolve this because the error is occurring before the configurations execute.
不知何故，发布目标文件夹一定是在发布过程中损坏了，因为我发现https://docs.microsoft.com/en-us/aspnet/core/fundamentals/错误处理
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