support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Controls/Attach/InfoElement.cs

@@ -0,0 +1,48 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls
+{
+    public class InfoElement : TitleElement
+    {
+        /// <summary>
+        ///     占位符
+        /// </summary>
+        public static readonly DependencyProperty PlaceholderProperty = DependencyProperty.RegisterAttached(
+            "Placeholder", typeof(string), typeof(InfoElement), new FrameworkPropertyMetadata(default(string), FrameworkPropertyMetadataOptions.Inherits));
+
+        public static void SetPlaceholder(DependencyObject element, string value) => element.SetValue(PlaceholderProperty, value);
+
+        public static string GetPlaceholder(DependencyObject element) => (string)element.GetValue(PlaceholderProperty);
+
+        /// <summary>
+        ///     是否必填
+        /// </summary>
+        public static readonly DependencyProperty NecessaryProperty = DependencyProperty.RegisterAttached(
+            "Necessary", typeof(bool), typeof(InfoElement), new FrameworkPropertyMetadata(ValueBoxes.FalseBox, FrameworkPropertyMetadataOptions.Inherits));
+
+        public static void SetNecessary(DependencyObject element, bool value) => element.SetValue(NecessaryProperty, value);
+
+        public static bool GetNecessary(DependencyObject element) => (bool)element.GetValue(NecessaryProperty);
+
+        /// <summary>
+        ///     标记
+        /// </summary>
+        public static readonly DependencyProperty SymbolProperty = DependencyProperty.RegisterAttached(
+            "Symbol", typeof(string), typeof(InfoElement), new FrameworkPropertyMetadata(default(string), FrameworkPropertyMetadataOptions.Inherits));
+
+        public static void SetSymbol(DependencyObject element, string value) => element.SetValue(SymbolProperty, value);
+
+        public static string GetSymbol(DependencyObject element) => (string)element.GetValue(SymbolProperty);
+
+        /// <summary>
+        ///     内容高度
+        /// </summary>
+        public static readonly DependencyProperty ContentHeightProperty = DependencyProperty.RegisterAttached(
+            "ContentHeight", typeof(double), typeof(InfoElement), new FrameworkPropertyMetadata(30.0, FrameworkPropertyMetadataOptions.Inherits));
+
+        public static void SetContentHeight(DependencyObject element, double value) => element.SetValue(ContentHeightProperty, value);
+
+        public static double GetContentHeight(DependencyObject element) => (double)element.GetValue(ContentHeightProperty);
+    }
+}