For the Selected Item and Selected Value bindings, I do not set a mode – this is because “Mode=Two Way” is the default.Two Way means that we want to update the property on the View Model when the selection changes, and if the property on the View Model changes we want to update the Selected Item/Selected Value on the Combo Box. I've been intrigued by computers since I was 12, staying in at recess to code QBASIC on the old Apple II. NET Access Denied Active MQ Active MQ-Camel Attribute Behavior C# Camel Cassandra Combo Box Connecting Cross-Field Data Binding Data Context Display Member Path Double Click Enumerate Event Example Framework Element GAC IData Error Info INotify Property Changed Instances Items Source Karaf Lucandra Lucandra. The reason for this is that the Category Parent property holds an instance of a category object wrapped in a proxy (I use lazy initialization), and the Category List holds a set of instances of Category objects.These end up not being the same in terms of the default object Equals method. Either overload the Equals method in your objects (also remembering to overload Get Hash Code), or use Selected Value and Selected Value Path.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. No matter what I do, I cannot get the UI to change when I set the Selected Item property via the View Model.Now that we’ve got a decent understanding of the common binding properties of a Selector control (I hope! Given the following classes (only class signatures; the full sample project including source code is attached to this post): Note the use of “Mode=One Way” in my Items Source bindings.This indicates to the binding that we’re only going to be updating the binding target (the Combo Box’s Items collection in this case).
This post will go through the differences, and how they are used, and also do a little review on databinding in WPF.In this post I’ll just cover what I learned about basic data binding, so here is what I needed to do, without all of the Data Template/Grid View bloat Note that in my case, the View Model which the Combo Box needed to get its items from was the Data Context of the page and the Data Context of the Combo Box was the View Model which I needed to bind values to.Now, all of that aside, let’s go over the more common properties used in Data Binding to a Selector control.The Selected Value property defines which property of the bound data object will be used to get the value.The Selected Value Path defines the property of the List Object to match.