Dependency property not updating ui
gets placed into View Model classes, and all visual widgets/controls get placed into XAML views.Typically we would have one View per View Model, but that’s not a requirement at all (more like a generalized observation), and in fact there are some situations where we might want to have multiple Views for the same View Model (or break a complex View Model into multiple parts while still connecting to a single View).Building upon the previous example, let’s suppose that we now want to add a “Full Name” property.We might first naively define it as such: But we would quickly see that this isn’t a wise implementation.And then what happens when something sets Full Name directly? We still need to keep track of which properties affect which other properties, and then we need to make sure that we have the right series of Raise Property Changed() calls in each property setter.If we forget just one, or misspell one, then our View Model will not work correctly.but what if your View Models need to be a lot more complicated than that?
there are many frameworks and examples out there, but I’ve not yet seen anyone else using this exact technique before…This is where my solution comes in – centralized management of the relationships between properties.My solution to this problem is to abstract away the concept of what it means for one property to be dependent upon another property – and then take care of cascading the update notifications automatically.It should update the private field first, and then raise one or more change notifications.In Observable Object, I have provided a function named Set Property Value() that performs all of these steps.
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It returns a boolean (indicating whether the value was actually modified), but you will almost never care about that.