LINQ to Entities搜索多个关键字的文本属性

using System.Linq;
using System.Data.Entity;

public static class QueryExtensions
{
    public static IQueryable<T> SearchFor<T>(this IQueryable<T> query, string searchTerm)
    {
        return query.Where(item => item.ToString().Contains(searchTerm));
    }
}

public class MyContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }
}

public class MyEntity
{
    public int Id { get; set; }
    public string Text { get; set; }
}

public class Program
{
    public static void Main()
    {
        using (var context = new MyContext())
        {
            var searchTerms = new[] { "keyword1", "keyword2" };
            var results = context.MyEntities.SearchFor(string.Join(" ", searchTerms));
            foreach (var result in results)
            {
                Console.WriteLine($"Entity {result.Id} contains search terms.");
            }
        }
    }
}