c# - 将 IEnumerable 保存到数据库中

Question

我有模型:它的数据来 self 解析它的某个站点。

public class Race
{
   [Key]
   public int Id;
    public string Cars;
    public string Place;
    public string Pilot;
}

var compare = Doc.DocumentNode
                 .SelectNodes(path)
                 .Select(s => new Race()
                            {
                                Cars =s.SelectNodes("./div[1]//text()").Single().InnerText,
                            }
                        );
using (_context) //  how can I do this?
{
    _context.Race.Add(compare);
    _context.SaveChanges();
}

Argument 1: cannot convert from 'System.Collections.Generic.IEnumerable<Race>' to 'Race'

Answer 1

您应该使用 AddRange 而不是 Add

using (_context)     //  how can I do this?
{
    _context.Race.AddRange(compare);
    _context.SaveChanges();
}