我正在尝试安装和配置 Umbraco 8。 NuGet 安装好 umbracoCms 然后我运行应用程序来配置数据库（自定义数据库）。
它崩溃显示：
Error during installation
See the log for full details (logs can typically be found in the App_Data\Logs folder)
日志并没有告诉 e 太多：
{"@t":"2019-04-24T04:04:00.1230739Z","@mt":"An error occurred in InstallStatus trying to check upgrades","@l":"Error","@x":"System.NullReferenceException: Object reference not set to an instance of an object.\r\n at Umbraco.Web.Install.InstallHelper.GetDbProviderString(ISqlContext sqlContext)\r\n at Umbraco.Web.Install.InstallHelper.InstallStatus(Boolean isCompleted, String errorMsg)","SourceContext":"Umbraco.Web.Install.InstallHelper","ProcessId":1180,"ProcessName":"iisexpress","ThreadId":13,"AppDomainId":3,"AppDomainAppId":"LMW3SVC2ROOT","MachineName":"Machine1","Log4NetLevel":"ERROR","HttpRequestNumber":4,"HttpRequestId":"{requestguid}"}
DB connestring 是正确的，正在创建数据库表，尽管从错误消息中我无法确定这是 DB 或应用程序的问题。
Umbraco 7.10 也发生了同样的事情。
我在 .NET 4.7.2、VS 15.9.11 和 MSSQL 2016 上运行该项目