如何使用FsXaml的CommandDependecy/(ies)

Question

下面是我使用FsXaml完成的工作

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 

和在xaml中

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

如何使用ViewModule的命令依赖性来设置x.ListOfData，而不是在x.SelectedId的setter中调用returnPrice(value)

Answer 1

你猜对了，@Foggy Finder。我把代码换成了-

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)

而且它起作用了！

self.DependencyTracker.AddCommandDependency()的用途是什么?如何使用它？