使用LINQ管理null

Question

有了这段代码

 var res = (from p in list where 
           p.FirstName.ToUpper() == firstName.ToUpper() || 
           p.LastName.ToUpper() == lastName.ToUpper() select p).ToList<Client>();

p.FirstName或firstName可以为NULL,我该怎么办呢？

谢谢,

Answer 1

像这样:

where String.Equals(p.LastName, lastName, StringComparison.OrdinalIgnoreCase)