I needed to be able to set the Focus of a control, using MVVM. This means of course, that we can’t interact directly with the View, but instead must rely on Binding. I found a very helpful post by Khalid Rafique which allows exactly this; http://codenicely.blogspot.co.uk/2012/01/how-to-set-textbox-focus-in-silverlight.html By making use of attached Interactivity Behaviours, we can [...]
In order to retrieve the highest value of a column in a list of collection, Linq offers a handy method to achieve this; Dim maxUnitsInStock = Aggregate prod In db.Products _ Into Max(prod.UnitsInStock)Simple!
While combining EF5 with WPF MVVM, I noticed that changes to individual properties within my bound DataContext weren’t updating the UI. This was of course because the the actual DataContext itself isn’t changing, but only the POCO Properties housed within in. However, each of the POCO Properties don’t individually raise an INotifyPropertyChanged event. In order [...]
If you ever need to retrieve data from EF using the name of a column, rather than the built in Intellisense, then the following vb.net code snippet may help. GetType(TypeOfEntity).GetProperty(NameOfColumn).GetValue(ActualEntity, Nothing)TypeOfEntity is the name of the Entity from which you wish to retrieve data. NameOfColumn is obviously the Name of the Column from which you [...]
I’ve come across a bug in the .Net Framework when developing a Windows Forms app, which has a Splash Screen. On some users machines, the application threw a “Invoke or BeginInvoke cannot be called on a control until the window handle has been created.” exception at startup. This is seemingly to do with code executing [...]