Unable to create an object of type 'SchoolContext'. Add an implementation of

 net  core 新搭建基架或操作数据库迁移时报错：

Unable to create an object of type 'SchoolContext'. Add an implementation of 'IDesignTimeDbContextFactory<SchoolContext>' to the project, or see https://go.microsoft.com/fwlink/?linkid=851728 for additional patterns supported at design time.

查找相关资料，解决办法如下：

在Data文件夹，创建一个名称为：SchoolContextFactory 的类，类代码如下：

namespace ContosoUniversity.Data
{
    public class SchoolContextFactory:IDesignTimeDbContextFactory<SchoolContext>
    {
       // IConfiguration Configuration { get; } //使用Configuration 获取不到GetConnectionString("SchoolContext")。不能用
        public SchoolContext CreateDbContext(string[] args)
        {
            var optionsBuilder = new DbContextOptionsBuilder<SchoolContext>();
            //   optionsBuilder.UseSqlServer(Configuration.GetConnectionString("SchoolContext"));
            optionsBuilder.UseSqlServer("Server = (localdb)\mssqllocaldb; Database = SchoolContext; Trusted_Connection = True; MultipleActiveResultSets = true");
            return new SchoolContext(optionsBuilder.Options);
        }

    }
}

注意： 红字内容。

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