如何处理空值？

Question

I am writing one LINQ to select data from entity. I have list of data with different attributes. One of the attribute could be null. so when it get null it giving me an below error

Error:

Object reference not set to instance of an object

Here is LINQ code:

var maxName = NameLookup.Select(c => c.DESC.Length).Max()

If DESC has null value than it should be also acceptable. I mean to say i want to handle if it contains null value.

Answer 1

尝试这个：

var maxName = NameLookup.Select(c => (c.DESC != null) ? c.DESC.Length : 0).Max()

Answer 2

var  maxName = NameLookup.Max(c => c.DESC!= null ? c.DESC.Length : 0);