优化更新代码，添加界面功能并整合

WPFluent/Controls/TextBoxEx/TextBoxExl.cs

@@ -0,0 +1,59 @@
+using System.Windows.Controls;
+
+namespace WPFluent.Controls
+{
+    public class TextBoxEx : WPFluent.Controls.TextBox
+    {
+        public static readonly DependencyProperty HeaderPlacementProperty =
+            DependencyProperty.Register(
+            nameof(HeaderPlacement),
+            typeof(Dock),
+            typeof(TextBoxEx),
+            new PropertyMetadata(Dock.Top));
+
+        public static readonly DependencyProperty HeaderProperty =
+            DependencyProperty.Register(nameof(Header), typeof(string), typeof(TextBoxEx), new PropertyMetadata(null));
+
+        // Using a DependencyProperty as the backing store for Prefix.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty PrefixProperty =
+            DependencyProperty.Register(nameof(Prefix), typeof(string), typeof(TextBoxEx), new PropertyMetadata(null));
+
+        // Using a DependencyProperty as the backing store for Suffix.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty SuffixProperty =
+            DependencyProperty.Register(nameof(Suffix), typeof(string), typeof(TextBoxEx), new PropertyMetadata(null));
+
+        static TextBoxEx()
+        {
+            DefaultStyleKeyProperty.OverrideMetadata(
+                typeof(TextBoxEx),
+                new FrameworkPropertyMetadata(typeof(TextBoxEx)));
+        }
+
+
+        public string Header
+        {
+            get { return (string)GetValue(HeaderProperty); }
+            set { SetValue(HeaderProperty, value); }
+        }
+
+
+        public Dock HeaderPlacement
+        {
+            get { return (Dock)GetValue(HeaderPlacementProperty); }
+            set { SetValue(HeaderPlacementProperty, value); }
+        }
+
+        public string Prefix
+        {
+            get { return (string)GetValue(PrefixProperty); }
+            set { SetValue(PrefixProperty, value); }
+        }
+
+
+        public string Suffix
+        {
+            get { return (string)GetValue(SuffixProperty); }
+            set { SetValue(SuffixProperty, value); }
+        }
+    }
+}