An error occurred while accessing the Microsoft.Extensions.Hosting services. Continuing without the application service provider. Error: Instance failure.
看了看是数据库连接字符串的问题，连接字符串在appsettings文件中，系统将我的
Server=localhost\\SQLEXPRESS;Database=abc;Trusted_Connection=True;
转义成了
Server=localhost\\\\SQLEXPRESS;Database=abc;Trusted_Connection=True;
斜杠的问题。
标签：abc,failure,Instance,migration,True,localhost From： https://www.cnblogs.com/tudou365/p/17076663.html