Wie FsXaml der CommandDependecy/(n)

Question

hier zu verwenden ist, was ich

getan mit FsXaml

type MainViewModel() as self = 
inherit ViewModelBase() 

    let listOfData = self.Factory.Backing(<@self.ListOfData@>, 0 :> obj) 
    let selectedId = self.Factory.Backing(<@self.SelectedId@>, 0) 

    member x.SelectedId with get() = selectedId.Value 
         and set value = selectedId.Value <- value; 
             x.ListOfData <- returnPrice(value) :> obj   
    member x.StockList with get() = stockList 
    member x.ListOfData with get() = listOfData.Value and set value = listOfData.Value <- value 

und in XAML

<ComboBox Grid.Row="1" ItemsSource="{Binding StockList}" 
       DisplayMemberPath="Code" 
       SelectedValuePath="Id" SelectedValue="{Binding SelectedId}"/> 
<DataGrid Grid.Row="2" ItemsSource="{Binding ListOfData}"/> 

Wie kann ich Befehl dependecy von ViewModule verwenden x.ListOfData zu setzen statt Rufen returnPrice(value) in Setter von x.SelectedId?

Answer 1

Sie haben es richtig @ Foggy Finder angenommen. Ich habe den Code ersetzt -

let selectedId = self.Factory.Backing(<@self.SelectedId@>, 0) 

do 
    self.DependencyTracker.AddPropertyDependency(<@self.ListOfData@>,<@self.SelectedId@>) 

member x.SelectedId with get() = selectedId.Value and set value = selectedId.Value <- value; 
member x.StockList with get() = stockList 
member x.ListOfData with get() = returnPrice(self.SelectedId) 

und es funktioniert!

Was ist der Zweck von selb.DependencyTracker.AddCommandDependency() und wie man es benutzt?