Better way for Comparing List in c#

Question

I have two list say

List<string> names; and List<Student> stud;

Student Class has 3 properties

ID
Name
Section

Now i want to loop through List<string> and compare each item with Name property in List<Student> and want to perform operations if they are not equal

I tried looping through names and comparing each values to stud.

But i thought there must be some better way of doing this with LINQ or should i be using YIELD.

Thanks

Answer 1

It's not very clear from your description, but if you want "all students whose names aren't in the list" you can definitely use LINQ:

var studentsWithoutListedNames = stud.Where(s => !names.Contains(s.Name));
foreach (var student in studentsWithoutListedNames)
{
    // Whatever...
}

Answer 2

If your intention is not what Jon describes but more to compare the list of names with the list of student names and find differences:

var invalidStudents = names.Zip(stud, (name, student) => new {name, student}).
                            Where(item => (item.name != item.student.Name));
if (invalidStudents.Any()) // Or foreach...
{
  ...
}

for example:

var names = new string[] { "John", "Mary" };
var stud = new Student[] { new Student(1, "John", "IT"), new Student(2, "Jack", "Math") };
var invalidStudents = names.Zip(stud, (name, student) => new {name, student}).
                            Where(item => (item.name != item.student.Name));
foreach (var item in invalidStudents)
{
  Console.WriteLine(item.name);
} 

Should write Mary