Radcombobox selectedvalue not updating

Hopefully, this clears up the mystery around why Selected Item doesn't work as expected with ORM layers like NHibernate. This property indicates the zero-based index of the currently selected item in the combo box list.Creating a Combo Box that displays the list is quite simple.Let's tackle the second issue (changing the Category Parent value of the selected Product) first.This post will go through the differences, and how they are used, and also do a little review on databinding in WPF.To set this up, let's define Category objects and Product objects like this: Category--ID--Category Name--Products (An IList)Product--ID--Product Name--Category Parent (A Category Object)In the detail form for the Product, you want to have a Combo Box that has as its Items Source the list of Categories.The Selected Value Path defines the property of the List Object to match.

If you want the trigger to fire as soon as the contents are changed, you need to set the property value to "Property Changed".)Now for the meat of this post - the Combo Box for the Category List.

Debugger Inside Drop Down Selected Index Changed Event " data-medium-file="https://taditdash.files.wordpress.com/2014/05/debugger-inside-dropdown-selectedindexchanged-event.jpg?

w=300" data-large-file="https://taditdash.files.wordpress.com/2014/05/debugger-inside-dropdown-selectedindexchanged-event.jpg? w=800" src="https://taditdash.files.wordpress.com/2014/05/debugger-inside-dropdown-selectedindexchanged-event.jpg? w=800&h=103" alt="Debugger Inside Drop Down Selected Index Changed Event" width="800" height="103" class="size-full wp-image-294" srcset="https://taditdash.files.wordpress.com/2014/05/debugger-inside-dropdown-selectedindexchanged-event.jpg?

Setting a new index raises the Selected Index Changed event.

The problem is simple: By default WPF compares Selected Item to each item in the Items Source by reference, meaning that unless the Selected Item points to the same item in memory as the Items Source item, it will decide that the item doesn’t exist in the Items Source and so no item gets selected.

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The unckecked keyword makes sure that ID*397 will get truncated if it exceeds Int32. Certainly not the best algorithm for Get Hash Code, but it suffices for this post.

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