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2017/09/18 22:32

投稿

Tak1wa

スコア4791

answer CHANGED Viewed

@@ -2,6 +2,8 @@
 DataContextを毎回入れ替えるのではなく、DataContext内の各プロパティを変更時に、変更通知を行うことでバインドしたUIは更新されます。
+INotifyPropertyChangedを実装したインスタンスをDataContextとすることで、どのプロパティが変更したかをUIへ通知できます。
 ```csharp
 public partial class MainWindow : Window
 {
@@ -9,7 +11,7 @@
     {
         InitializeComponent();
         //this.DataContext = new { labelA = "A", labelB = "B" };
-        _viewModel = new MainWindowViewModel { LabelA = "A", LabelB = "B" };
+        _viewModel = new MainWindowViewModel { labelA = "A", labelB = "B" };
         this.DataContext = _viewModel;
     }
@@ -18,37 +20,37 @@
     private void btn1_Click(object sender, RoutedEventArgs e)
     {
         //this.DataContext = new { labelA = "A+", labelB = "B+" };
-        _viewModel.LabelA = "A+";
+        _viewModel.labelA = "A+";
-        _viewModel.LabelB = "B+";
+        _viewModel.labelB = "B+";
     }
     private void btn2_Click(object sender, RoutedEventArgs e)
     {
         //this.DataContext = new { labelA = "A++" };
-        _viewModel.LabelA = "A++";
+        _viewModel.labelA = "A++";
     }
 }
 public class MainWindowViewModel : INotifyPropertyChanged
 {
     private string _labelA;
-    public string LabelA
+    public string labelA
     {
         get { return _labelA; }
         set {
             _labelA = value;
-            OnPropertyChanged("LabelA");
+            OnPropertyChanged("labelA");
         }
     }
     private string _labelB;
-    public string LabelB
+    public string labelB
     {
         get { return _labelB; }
         set {
             _labelB = value;
-            OnPropertyChanged("LabelB");
+            OnPropertyChanged("labelB");
         }
     }
@@ -58,4 +60,4 @@
         this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
     }
 }
-```
+```