Unable to create an object of type 'DbContext'.For the different patterns supported at design time..

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如果在做EFCore migration时碰到类似错误：Unable to create an object of type 'DbContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

可尝试以下步骤进行处理：

检查是否未实现EFContext默认构造函数
尝试清理解决方案，清除目录下的bin和obj
如果还不行，尝试在DbContext同级目录下添加类DesignTimeDbContextFactory

public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<EFContext>
{
    public EFContext CreateDbContext(string[] args)
    {
        var optionsBuilder = new DbContextOptionsBuilder<EFContext>();
        optionsBuilder.UseSqlite($"tmp.db");

        return new EFContext(optionsBuilder.Options);
    }
}