private async void DoDeleteRequirement()
{
await DialogHost.Show(new OkCancelMessageDialog()
{
DataContext = $"Delete {SelectedRequirement.Name}?"
},
"RequirementDialog",
delegate(object sender, DialogClosingEventArgs args)
{
bool result = false;
if (Equals(args.Parameter, "Cancel"))
{
return;
}
if (_isOkMessageOpen)
{
_isOkMessageOpen = false;
return;
}
if (Equals(args.Parameter, "Ok"))
{
args.Session.UpdateContent(new PleaseWaitView());
Task.Run(() =>
{
try
{
//_context.Entry(SelectedRequirement).State = EntityState.Deleted;
//var students = _context.Students.ToList();
//foreach (var student in students)
//{
// student.RequirementStudents.FirstOrDefault(
// c => c.RequirementId == SelectedRequirement.Id);
//}
//var entity = _context.Requirements.FirstOrDefault(c => c.Id == SelectedRequirement.Id);
//if (entity != null) _context.Requirements.Remove(entity);
using (var context = new MorenoContext())
{
var entity =
context.Requirements.FirstOrDefault(c => c.Id == SelectedRequirement.Id);
if (entity != null)
{
context.Requirements.Remove(entity);
}
context.SaveChanges();
result = true;
}
//_context.SaveChanges();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
result = false;
}
}).ContinueWith((t, _) =>
{
if (!result)
{
args.Cancel();
_isOkMessageOpen = true;
args.Session.UpdateContent(new OkMessageDialog()
{
DataContext = "Failed to Delete"
});
}
else
{
Requirements.Remove(SelectedRequirement);
}
}, null, TaskScheduler.FromCurrentSynchronizationContext());
}
});
}
public void MoveSelection(TreeListViewRow destination)
{
if (destination != null)
{
RequirementModel destinationItem = (destination.DataContext) as RequirementModel;
try
{
// Setup a private collection with the selected items only. This is because the SelectedItems that are part of the view model collection
// will change as soon as we start removing and adding objects
TD.ObservableItemCollection <RequirementModel> selectedItems = new TD.ObservableItemCollection <RequirementModel>();
foreach (RequirementModel item in SelectedItems)
{
selectedItems.Add(item);
}
foreach (RequirementModel item in selectedItems)
{
// find the original parent of the object that's moved
RequirementModel parentSourceItem = GetRequirement(item.Parent_ID);
// If the parent is in the root level
if (parentSourceItem == null)
{
// Remove the item in the root level
Requirements.Remove(item);
}
else
{
// Otherwise remove the item from the child collection
parentSourceItem.ChildRequirements.Remove(item);
}
TreeListViewDropPosition relativeDropPosition = (TreeListViewDropPosition)destination.GetValue(RadTreeListView.DropPositionProperty);
// If put on top of destination
if (relativeDropPosition == TreeListViewDropPosition.Inside)
{
// the Parent_ID of the item will become the ID of the destination
item.Parent_ID = destinationItem.ID;
destinationItem.ChildRequirements.Add(item);
}
// If put before or after the destination
else
{
// if the desitination is in the root collection
if (destinationItem.Parent_ID == null)
{
// The parent_ID of the item will also be null
item.Parent_ID = null;
Requirements.Insert(Requirements.IndexOf(destinationItem), item);
}
else
{
// otherwise the Parent_ID of the item will be the same as that of the destination item
item.Parent_ID = destinationItem.Parent_ID;
// find the Parent of the destination item
parentSourceItem = GetRequirement(destinationItem.Parent_ID);
// Insert the item above the destination item in the ChildObject collection of the parent of the destination
if (relativeDropPosition == TreeListViewDropPosition.Before)
{
parentSourceItem.ChildRequirements.Insert(parentSourceItem.ChildRequirements.IndexOf(destinationItem), item);
}
else
{
parentSourceItem.ChildRequirements.Insert(parentSourceItem.ChildRequirements.IndexOf(destinationItem) + 1, item);
}
}
}
}
}
catch (Exception ex)
{
RadWindow.Alert(ex.Message);
}
}
}