如何遍历列表中对象的属性？

Question

I have a list of objects and i want to iterate through the properties of the object using the 'previous' and 'next' buttons in WPF.
For example if i'm iterating through the properties of an object then by clicking the 'previous' button i encounter the properties of the object located before the object i was currently iterating through and same case for the 'next' button ...

if i have a Student class containing properties first and last name and number of student objects stored in studentList then how would i do that?
I am only concerned about the implementation of the eventHandler method for 'next' and 'previous' buttons

class Student
{
    private string firstName;

    public string FirstName
    {
        get { return firstName; }
        set { firstName = value; }
    }
    private string lastName;

    public string LastName
    {
        get { return lastName; }
        set { lastName = value; }
    }
    private string city;

    public string City
    {
        get { return city; }
        set { city = value; }
    }

}

private void btnCreateStudent_Click(object sender, RoutedEventArgs e)
    {
        Student student1 = new Student();
        student1.FirstName = txtFirstName.Text;
        student1.LastName = txtLastName.Text;
        student1.City = txtCity.Text;

        studentList.Add(student1);

        MessageBox.Show("Student Created");

        txtFirstName.Clear();
        txtLastName.Clear();
        txtCity.Clear();
    }

private void btnPrevious_Click(object sender, RoutedEventArgs e)
    {
      // need implementation code
    }
private void btnNext_Click(object sender, RoutedEventArgs e)
    {
      // need implementation code
    }

Thanks

Answer 1

Assuming you are not using any binding stuff, you should write a helper method that populates your UI with the values from your currently selected Student object:

private void bindStudent(Student student) {
    if (student != null) {
        txtFirstName.Text = student.FirstName;
        txtLastName.Text = student.LastName;
        txtCity.Text = student.City;
    }
    else { // Just a fail-safe.
        txtFirstName.Clear();
        txtLastName.Clear();
        txtCity.Clear();
    }
}

Then your Next and Previous buttons only need to fetch the respective object from your studentList and call the method with it. One thing you need to do is to remember which object in your list is currently selected in order to get the "next" and "previous" objects.

private int curSelectionIndex = -1;

private void btnPrevious_Click(object sender, RoutedEventArgs e)
{
  if (curSelectionIndex - 1 >= 0)
  {
      curSelectionIndex--;
      bindStudent(studentList[curSelectionIndex]);
  }
}

private void btnNext_Click(object sender, RoutedEventArgs e)
{
  if (curSelectionIndex + 1 < studentList.Count)
  {
      curSelectionIndex++;
      bindStudent(studentList[curSelectionIndex]);
  }
}

Your question didn't specify what you want to do with the UI after creating a fresh student, so I didn't do anything in regards to updating that selection.