用字典綁定ComboBoxes itemssource

Question

爲什麼第一個示例不更新comboBoxes itemsSource，但第二個示例會如何？據我所知，如果我明確地調用OnPropertyChanged（），那麼它會通知GUI並從我的虛擬機中獲取新值。

例如1 - 在GUI不更新（在CBO沒有任何項目）

 // this is the property it's bound to 
     this.AvailableSleepTimes = new Dictionary<string, int>(); 

     // gets a dictionary with values 
     Dictionary<string, int> allTimes = ReminderTimesManager.GetReminderTimes(); 

     foreach(KeyValuePair<string,int> pair in allTimes) 
     { 
      // logic for adding to the dictionary 
      this.AvailableSleepTimes.Add(pair.Key, pair.Value); 

     } 
     OnPropertyChanged(() => this.AvailableSleepTimes); 

例如2 - 更新的圖形用戶界面（CBO充滿）

 // this is the property it's bound to 
     this.AvailableSleepTimes = new Dictionary<string, int>(); 

     // gets a dictionary with values 
     Dictionary<string, int> allTimes = ReminderTimesManager.GetReminderTimes(); 

     Dictionary<string, int> newList = new Dictionary<string, int>(); 

     foreach(KeyValuePair<string,int> pair in allTimes) 
     { 
      // logic for adding to the dictionary 
      newList.Add(pair.Key, pair.Value); 

     } 
     this.AvailableSleepTimes = newList; 
     OnPropertyChanged(() => this.AvailableSleepTimes); 

Answer 1

沒有改變性質創建的通知當你添加/刪除一個項目到字典。但是，當您重新分配屬性時，它會觸發OnPropertyChanged並更新GUI。

爲了使GUI集合時被添加到更新，您需要使用的ObservableCollection類 https://msdn.microsoft.com/en-us/library/ms668604(v=vs.110).aspx

http://www.c-sharpcorner.com/UploadFile/e06010/observablecollection-in-wpf/