c# - 使用包含和不包含的 Linq 查询

Question

我正在尝试从数据库中获取记录它应该 getrecords 其中名称包含“searchKey”和名称不在逗号分隔的 excludeTerms 数组中。我如何在 Linq 中执行此操作？

 Rows = (from u in DB.Clients
         where u.Name.Contains(searchTerm) && !u.Name.Contains(string.Join(",", excludeTerms.Select(s => "'" + s + "'").ToArray()))
         select new ClientModel
         {
            Name = u.FullName,
            Id = u.Id,
         }).Take(5).ToList();

其中 excludeTerms 包含元素列表，例如

1)Sandy
2)Mandy
3)Larry etc

---

List<string> excludeTerms = new List<string>();

Answer 1

不幸的是，您只能将本地序列与 Contains 运算符(转换为 SQL IN 运算符)一起使用。因此，您可以将整个过滤移动到内存中

Rows = (from u in DB.Clients.AsEnumerable()
        where u.Name.Contains(searchTerm) &&
             !excludeTerms.Any(s => u.Name.Contains(s))
         select new ClientModel {
              Name = u.FullName,
              Id = u.Id,
         }).Take(5).ToList();

或者只是过滤掉被排除的词:

Rows = (from u in DB.Clients
        where u.Name.Contains(searchTerm)                 
        select new ClientModel {
              Name = u.FullName,
              Id = u.Id,
        }).AsEnumerable()
          .Where(m => !excludeTerms.Any(s => m.Name.Contains(s)))
          .Take(5).ToList();