/// <summary>
/// Invoked whenever the dependency graph between <see cref="MyStudent"/>
/// property and the <see cref="Address.City"/> of the student's
/// school is being changed.
/// </summary>
private void OnStudentCityChanged(object sender, DependencyChangeEventArgs <string> e)
{
//get the changed node
DependencyNode <string> changedNode = e.ChangedNode;
//get student name, if we have one after all
string studentName = myStudent == null ? "[none]" : myStudent.Name;
//get the school name
string school = "[none]";
if (myStudent != null && myStudent.School != null)
{
school = myStudent.School.SchoolName;
}
//get the city, if the dependency graph leads to a valid address
string city = changedNode.IsChainBroken ? "[unavailable]" : changedNode.LeafValue;
//NOTE: You can also get the leaf value through this convenience method:
//string city = e.TryGetLeafValue("[unavailable]");
//write student/city to console
string msg = "Student {0} goes now to school {1} in {2}. Change reason: {3}, Changed property: {4}";
Console.Out.WriteLine(msg, studentName, school, city, e.Reason, e.ChangedMemberName);
}
private void OnDependencyChanged(object sender, DependencyChangeEventArgs <ObservableCollection <Student> > e)
{
Console.Out.WriteLine("e.Reason = {0}", e.Reason);
Console.Out.WriteLine("e.ChangedMemberName = {0}", e.ChangedMemberName);
eventCounter++;
lastEventArgs = e;
}
public void BaseInit()
{
LastEventArgs = null;
ChangeEventCount = 0;
Student = TestUtil.CreateTestStudent();
//include the address field rather than the property!
CreateDependency();
Dependency.DependencyChanged += OnDependencyChanged;
Init();
//reset finalization counters
TestUtil.ResetFinalizationCounters();
}
public void Init()
{
eventCounter = 0;
lastEventArgs = null;
course = new Course();
for (int i = 0; i < 10; i++)
{
var student = TestUtil.CreateTestStudent();
student.Name = "Student " + i;
course.Students.Add(student);
}
dependency = DependencyNode.Create(() => course.Students);
dependency.DependencyChanged += OnDependencyChanged;
}
public void Init()
{
eventCounter = 0;
lastEventArgs = null;
course = new Course();
for (int i = 0; i < 10; i++)
{
var student = TestUtil.CreateTestStudent();
student.Name = "Student " + i;
course.Students.Add(student);
}
dependency = DependencyNode.Create(() => course.Students);
dependency.DependencyChanged += OnDependencyChanged;
}
private void OnCourseChanged(object sender, DependencyChangeEventArgs<bool?> e)
{
changeCounter++;
}
/// <summary>
/// Invoked whenever the dependency graph between <see cref="MyStudent"/>
/// property and the <see cref="Address.City"/> of the student's
/// school is being changed.
/// </summary>
private void OnStudentCityChanged(object sender, DependencyChangeEventArgs<string> e)
{
//get the changed node
DependencyNode<string> changedNode = e.ChangedNode;
//get student name, if we have one after all
string studentName = myStudent == null ? "[none]" : myStudent.Name;
//get the school name
string school = "[none]";
if (myStudent != null && myStudent.School != null)
{
school = myStudent.School.SchoolName;
}
//get the city, if the dependency graph leads to a valid address
string city = changedNode.IsChainBroken ? "[unavailable]" : changedNode.LeafValue;
//NOTE: You can also get the leaf value through this convenience method:
//string city = e.TryGetLeafValue("[unavailable]");
//write student/city to console
string msg = "Student {0} goes now to school {1} in {2}. Change reason: {3}, Changed property: {4}";
Console.Out.WriteLine(msg, studentName, school, city, e.Reason, e.ChangedMemberName);
}
/// <summary>
/// Change event handler for the <see cref="DependencyNode{T}.DependencyChanged"/>
/// event of the test's <see cref="Dependency"/> property.
/// </summary>
protected virtual void OnDependencyChanged(object sender, DependencyChangeEventArgs <string> e)
{
ChangeEventCount++;
LastEventArgs = e;
}
/// <summary>
/// Change event handler for the <see cref="DependencyNode{T}.DependencyChanged"/>
/// event of the test's <see cref="Dependency"/> property.
/// </summary>
protected virtual void OnDependencyChanged(object sender, DependencyChangeEventArgs<string> e)
{
ChangeEventCount++;
LastEventArgs = e;
}
private void OnDependencyChanged(object sender, DependencyChangeEventArgs<ObservableCollection<Student>> e)
{
Console.Out.WriteLine("e.Reason = {0}", e.Reason);
Console.Out.WriteLine("e.ChangedMemberName = {0}", e.ChangedMemberName);
eventCounter++;
lastEventArgs = e;
}
private void OnParentDependencyChanged(object sender, DependencyChangeEventArgs <string> e)
{
Console.Out.WriteLine("{0}: Changed parent dependency with value {1}", name, e.TryGetLeafValue());
}
private void OnParentDependencyChanged(object sender, DependencyChangeEventArgs<string> e)
{
Console.Out.WriteLine("{0}: Changed parent dependency with value {1}", name, e.TryGetLeafValue());
}
private void OnCourseChanged(object sender, DependencyChangeEventArgs <bool?> e)
{
changeCounter++;
}
