IList<string> strList1 = new List<string>(){"One", "Two", "Three", "Four", "Three"};

IList<string> strList2 = new List<string>(){"One", "Two", "Three", "Four", "Three"};

bool isEqual = strList1.SequenceEqual(strList2); // returns true

IList<string> strList1 = new List<string>(){"One", "Two", "Three", "Four", "Three"};

IList<string> strList2 = new List<string>(){ "Two", "One", "Three", "Four", "Three"};

bool isEqual = strList1.SequenceEqual(strList2); // returns false

//如果是引用类型,则比较的是引用

Student std = , StudentName = "Bill" };

IList<Student> studentList1 = new List<Student>(){ std };

IList<Student> studentList2 = new List<Student>(){ std };

bool isEqual = studentList1.SequenceEqual(studentList2); // returns true

Student std1 = , StudentName = "Bill" };

Student std2 = , StudentName = "Bill" };

IList<Student> studentList3 = new List<Student>(){ std1};

IList<Student> studentList4 = new List<Student>(){ std2 };

isEqual = studentList3.SequenceEqual(studentList4);// returns false

在上面的示例中，studentList1和studentList2包含相同的学生对象std。 所以studentList1.SequenceEqual（studentList2）返回true。 但是，stdList1和stdList2包含两个独立的学生对象std1和std2。 所以现在，stdList1.SequenceEqual（stdList2）将返回false，即使std1和std2包含相同的值。

要比较复杂类型（引用类型或对象）的两个集合的值，您需要实现IEqualityComperar <T>接口，如下所示。

class StudentComparer : IEqualityComparer<Student>

{

    public bool Equals(Student x, Student y)

    {

        if (x.StudentID == y.StudentID && x.StudentName.ToLower() == y.StudentName.ToLower())

            return true;

        return false;

    }

    public int GetHashCode(Student obj)

    {

        return obj.GetHashCode();

    }

}

// following returns true

bool isEqual = studentList1.SequenceEqual(studentList2, new StudentComparer());