目前电脑上装了一个sqlserver2019express
The database 'E:\DESIGN FILES\C#\WEBAPPLICATION1\WEBAPPLICATION1\APP_DATA\DATABASE1.MDF' cannot be opened because it is version 904. This server supports version 852 and earlier. A downgrade path is not supported.
Could not open new database 'E:\DESIGN FILES\C#\WEBAPPLICATION1\WEBAPPLICATION1\APP_DATA\DATABASE1.MDF'. CREATE DATABASE is aborted.
An attempt to attach an auto-named database for file E:\Design Files\c#\WebApplication1\WebApplication1\App_Data\Database1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
版本不兼容，是不是有不同版本的数据库放在一起哦，这个数据库'E:\DESIGN FILES\C#\WEBAPPLICATION1\WEBAPPLICATION1\APP_DATA\DATABASE1.MDF的版本不一样。
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