C＃WPF XAML自動文本框失去焦點而打字

Question

我在XAML中有一個文本框（當然，一些文本框），這些行爲不當。當我將注意力集中到文本框（有或沒有輸入任何內容）時，經過一段時間後，特定文本框會自動失去焦點。對於某些文本框，它發生得很快，而對於一些文本框卻很慢，但總是發生。它在過去3天裏殺了我，但找不到任何東西。它只是一個普通的文本框。如果任何人有任何想法或背後的可能性，請提及它。

Answer 1

我面臨這個問題太時，我曾與複雜的GUI有很多表，主信息等坦率地說，我也沒搞清楚什麼是這個問題的原因，但有時只專注迷路了在打字過程中。 我解決了這個問題，此行爲：在XAML

public class TextBoxBehaviors 
{ 
    public static bool GetEnforceFocus(DependencyObject obj) 
    { 
     return (bool)obj.GetValue(EnforceFocusProperty); 
    } 

    public static void SetEnforceFocus(DependencyObject obj, bool value) 
    { 
     obj.SetValue(EnforceFocusProperty, value); 
    } 

    // Using a DependencyProperty as the backing store for EnforceFocus. This enables animation, styling, binding, etc... 
    public static readonly DependencyProperty EnforceFocusProperty = 
     DependencyProperty.RegisterAttached("EnforceFocus", typeof(bool), typeof(TextBoxBehaviors), new PropertyMetadata(false, 
      (o, e) => 
      { 
       bool newValue = (bool)e.NewValue; 
       if (!newValue) return; 

       TextBox tb = o as TextBox; 

       if (tb == null) 
       { 
        MessageBox.Show("Target object should be typeof TextBox only. Execution has been seased", "TextBoxBehaviors warning", 
         MessageBoxButton.OK, MessageBoxImage.Warning); 
       } 

       tb.TextChanged += OnTextChanged; 

      })); 

    private static void OnTextChanged(object o, TextChangedEventArgs e) 
    { 
     TextBox tb = o as TextBox; 
     tb.Focus(); 
     /* You have to place your caret at the end of your text manually, because each focus repalce your caret at the beging of text.*/ 
     tb.CaretIndex = tb.Text.Length; 
    } 

} 

用法：

<TextBox x:Name="txtPresenter" 
      behaviors:TextBoxBehaviors.EnforceFocus="True" 
      Text="{Binding Path=MyPath, UpdateSourceTrigger=PropertyChanged}" 
      VerticalAlignment="Center" />