Style定义实例

给Textbox定义一个阴影效果。

 

UpdateSourceTrigger

 

默认UpdateSourceTrigger为LostFoucs，有时需要及时CommitValue，则需要设置为PropertyChanged。这样当Text属性的值发生变化时，我们的值就能及时更新到Datasource中。

更多参考

NumberTextbox

1. 使用NubmberTextboxBehavior
2. 将TextBox的binding属性中Delay设置为1000

//NumericTextBoxBehavior/// 
    /// This forces a TextBoxBase control to be numeric-entry only    /// 
    /// 
     
          ///   ]]>    /// 
         public static class NumericTextBoxBehavior    {        #region IsEnabled DP        /// 
        /// Dependency Property for turning on numeric behavior in a TextBox.        /// 
        public static readonly DependencyProperty IsEnabledProperty =            DependencyProperty.RegisterAttached("IsEnabled",                typeof(bool), typeof(NumericTextBoxBehavior),                    new UIPropertyMetadata(false, OnEnabledStateChanged));        /// 
        /// Attached Property getter for the IsEnabled property.        /// 
        /// Dependency Object        /// 
     
      Current property value
             public static bool GetIsEnabled(DependencyObject source)        {            return (bool)source.GetValue(IsEnabledProperty);        }        /// 
        /// Attached Property setter for the IsEnabled property.        /// 
        /// Dependency Object        /// Value to set on the object        public static void SetIsEnabled(DependencyObject source, bool value)        {            source.SetValue(IsEnabledProperty, value);        }        /// 
        /// This is the property changed handler for the IsEnabled property.        /// 
        ///         ///         private static void OnEnabledStateChanged(DependencyObject sender,            DependencyPropertyChangedEventArgs e)        {            TextBox tb = sender as TextBox;            if (tb == null)                return;            tb.PreviewTextInput -= tbb_PreviewTextInput;            DataObject.RemovePastingHandler(tb, OnClipboardPaste);            bool b = ((e.NewValue != null && e.NewValue.GetType() == typeof(bool))) ?                (bool)e.NewValue : false;            if (b)            {                tb.PreviewTextInput += tbb_PreviewTextInput;                DataObject.AddPastingHandler(tb, OnClipboardPaste);            }        }        #endregion        #region Private Methods        /// 
        /// This method handles paste and drag/drop events        /// onto the TextBox. It restricts the character        /// set to numerics and ensures we have consistent behavior.        /// 
        /// TextBox sender        /// EventArgs        private static void OnClipboardPaste(object sender, DataObjectPastingEventArgs e)        {            TextBox tb = sender as TextBox;            string text = e.SourceDataObject.GetData(e.FormatToApply) as string;            if (tb != null && !string.IsNullOrEmpty(text) && !Validate(tb, text))                e.CancelCommand();        }        /// 
        /// This checks if the resulting string will match the regex expression        /// 
        static void tbb_PreviewTextInput(object sender, TextCompositionEventArgs e)        {            TextBox tb = sender as TextBox;            if (tb != null && !Validate(tb, e.Text))                e.Handled = true;        }        #endregion        private static bool Validate(TextBox tb, string newContent)        {            string testString = string.Empty;            // replace selection with new text.            if (!string.IsNullOrEmpty(tb.SelectedText))            {                string pre = tb.Text.Substring(0, tb.SelectionStart);                string after = tb.Text.Substring(tb.SelectionStart + tb.SelectionLength,                               tb.Text.Length - (tb.SelectionStart + tb.SelectionLength));                testString = pre + newContent + after;            }            else            {                string pre = tb.Text.Substring(0, tb.CaretIndex);                string after = tb.Text.Substring(tb.CaretIndex,                                       tb.Text.Length - tb.CaretIndex);                testString = pre + newContent + after;            }            Regex regExpr = new Regex(@"^([-+]?)(\d*)([,.]?)(\d*)$");            if (regExpr.IsMatch(testString))                return true;            return false;        }    }

WaterMark/HintText/PlaceHoder

1. 通过Style
2. 通过AttachBehavior
3. 通过自定义控件

1.给TextBox添加水印效果（提示文字）

2.通过AttachBehavior

 

3.通过自定义控件

 

 

参考