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I have a Windows Forms app with databinding (yes, I know, shoot me now) and it has a "Save" toolbar button. I want to gray out the "Save" button unless the user has made a change to the form control that will change a property on the DataContext.
 
The table has 100's of properties so I don't want to implement
 
partial void OnXXXChanged(XXX value)
{
 
}
 
over and over again. My thought was to add a delegate to the DataContext partial class and maybe a polling thread to check the properties and ask if they've been changed.
 
DataContext appears to implement INotifyPropertyChanged etc but I can't seem to tie onto the PropertyChanged event from my Model.
 
How can I detect, essentially, the condition "hey! you need to call SubmitChanges() stoop!" and get a notification when that happens so I can un-gray the save button?
Posted 22-Jun-12 9:23am

1 solution

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Solution 1

*Nevermind*
 
One way, a total hack is to do
 
partial class DbDataContext
{
    public bool IsDirty { get; set; }
 
    partial void OnCreated()
    {
        Application.Idle += (sender, e) =>
        {
            ChangeSet set = GetChangeSet();
 
            IsDirty = set.Inserts.Count > 0 || set.Updates.Count > 0 
                 || set.Deletes.Count > 0;
        };
    }
}
 
And of course also update the Save button on Application.Idle.
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