如何比较两个对象数组

Question

i have an object called Person . It has properties First, Last, Age , etc . . .

I have two arrays of Person objects.

I want to have some function to take two arrays

Person[] firstlist =  . .
Person[] secondList =  . . 

and have it spit out two new arrays

Person[] peopleinFirstListandNotSecond
Person[] peopleinSecondListandNotFirst

Since these are not string arrays, i would want to do a compare on first and last name and age to determine if its the same person

Answer 1

Here is a linq function ( IEnumerable<T>.Except(...) ) that will do what you need.

http://msdn.microsoft.com/en-us/library/bb336390.aspx

Answer 2

You could write a comparer (implement the IEqualityComparer interface ) then use it with the Except extension method, as other posters have noted.

Or, you could just do the comparison within the lambda eg

var peopleinFirstListAndNotSecond =     
    firstList.
    Where( p => 
            !secondList.Any( s => 
                s.Age == p.Age && 
                s.FirstName == p.FirstName && 
                s.SecondName == p.SecondName
         ) 
    );

Answer 3

实现IComparable（参见SO：IComparable和Equals ），然后遍历每个列表，构建所需的两个输出列表。