public Student()
{
ResetGpaCommand = new Command(() => GradePointAverage = 2.5);
MoveToTopCommand = new Command(() => StudentBody.MoveStudentToTop(this));
MoveToBottomCommand = new Command(() => StudentBody.MoveStudentToBottom(this));
RemoveCommand = new Command(() => StudentBody.RemoveStudent(this));
}
public SchoolViewModel(IDictionary <string, object> properties)
{
// Avoid problems with a null or empty collection.
StudentBody = new StudentBody();
StudentBody.Students.Add(new Student());
string uri = "http://xamarin.github.io/xamarin-forms-book-samples" +
"/SchoolOfFineArt/students.xml";
HttpWebRequest request = WebRequest.CreateHttp(uri);
request.BeginGetResponse((arg) =>
{
// Deserialize XML file.
Stream stream = request.EndGetResponse(arg).GetResponseStream();
StreamReader reader = new StreamReader(stream);
XmlSerializer xml = new XmlSerializer(typeof(StudentBody));
StudentBody = xml.Deserialize(reader) as StudentBody;
// Enumerate through all the students
foreach (Student student in StudentBody.Students)
{
// Set StudentBody property in each Student object.
student.StudentBody = StudentBody;
// Load possible Notes from properties dictionary
// (for program in Chapter 25).
if (properties != null && properties.ContainsKey(student.FullName))
{
student.Notes = (string)properties[student.FullName];
}
}
}, null);
// Adjust GradePointAverage randomly.
Device.StartTimer(TimeSpan.FromSeconds(0.1),
() =>
{
if (studentBody != null)
{
int index = rand.Next(studentBody.Students.Count);
Student student = studentBody.Students[index];
double factor = 1 + (rand.NextDouble() - 0.5) / 5;
student.GradePointAverage = Math.Round(
Math.Max(0, Math.Min(5, factor * student.GradePointAverage)), 2);
}
return(true);
});
}
public SchoolViewModel(IDictionary <string, object> properties)
{
StudentBody = new StudentBody();
StudentBody.Students.Add(new Student());
string uri = "http://xamarin.github.io/xamarin-forms-book-samples/SchoolOfFineArt/students.xml";
HttpWebRequest request = WebRequest.CreateHttp(uri);
request.BeginGetResponse((arg) =>
{
Stream stream = request.EndGetResponse(arg).GetResponseStream();
StreamReader reader = new StreamReader(stream);
XmlSerializer xml = new XmlSerializer(typeof(StudentBody));
StudentBody = xml.Deserialize(reader) as StudentBody;
foreach (Student student in StudentBody.Students)
{
student.StudentBody = StudentBody;
if (properties != null && properties.ContainsKey(student.FullName))
{
student.Notes = (string)properties[student.FullName];
}
}
}, null);
Device.StartTimer(TimeSpan.FromSeconds(0.1), () =>
{
if (studentBody != null)
{
int index = rand.Next(studentBody.Students.Count);
Student student = StudentBody.Students[index];
double factor = 1 + (rand.NextDouble() - 0.5) / 5;
student.GradePointAverage = Math.Round(Math.Max(0, Math.Min(5, factor * student.GradePointAverage)), 2);
}
return(true);
});
}