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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


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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