非构造函数方式创建DbContext实例的方法

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.EntityFrameworkCore.Infrastructure;

namespace MyProject
{
public class BloggingContextFactory : IDesignTimeDbContextFactory
{
public BloggingContext CreateDbContext(string[] args)
{
var optionsBuilder = new DbContextOptionsBuilder();
optionsBuilder.UseSqlite("Data Source=blog.db");

return new BloggingContext(optionsBuilder.Options);
}
}
}