Question

我在ASP.NET MVC中有一个项目。我需要连接一个数据库，并从后面使用后缀'r'从中拉出所有客户端。我试过了：

public class MyDBRepository
{
    public IEnumerable<MyClient> GetNamesBySuffix(char symbol)
    {
        List<MyClient> myClients = new List<MyClient>();

        using (MyDBEntities m = new MyDBEntities())
        {
            List<Client> Clients = new List<Client>();
            Clients = m.Clients.Where(c => c.name[c.name.Length-1] == symbol).ToList();
            foreach (Client client in Clients)
            {
                MyClient newClient = new MyClient() { Name = client.name };
                myClients.Add(newClient);
            }
            return myClients;
        }
    }
}

我收到了System.NotSupportedException，我无法在sql中使用索引(c.name[c.name.Length-1])。帮助者的ty！

Answer 1

尝试

Clients = m.Clients.Where(c => c.name.EndsWith(symbol.ToString())).ToList();

Answer 2

查看下面的代码，使用EndsWith根据最后一个字符查找数据。

public class MyDBRepository
{
  public IEnumerable<MyClient> GetNamesBySuffix(char symbol)
  {
    List<MyClient> myClients = new List<MyClient>();

    using (MyDBEntities m = new MyDBEntities())
    {
      myClients = m.Clients.Where(c => c.name.Trim().EndsWith(symbol+""))
                           .Select(c=>new MyClient {name=c.name})
                           .ToList();           
      return myClients;
    }
  }
}

使用具有特定后缀的LINQ（EF）从表中获取名称

2 个答案: