support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Controls/Base/RegularItemsControl.cs

@@ -0,0 +1,41 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls
+{
+    /// <summary>
+    ///     规则ItemsControl
+    /// </summary>
+    /// <remarks>
+    ///     该类的每一项都具有相同的大小和外边距
+    /// </remarks>
+    public class RegularItemsControl : SimpleItemsControl
+    {
+        public static readonly DependencyProperty ItemWidthProperty = DependencyProperty.Register(
+            "ItemWidth", typeof(double), typeof(RegularItemsControl), new PropertyMetadata(ValueBoxes.Double200Box));
+
+        public double ItemWidth
+        {
+            get => (double) GetValue(ItemWidthProperty);
+            set => SetValue(ItemWidthProperty, value);
+        }
+
+        public static readonly DependencyProperty ItemHeightProperty = DependencyProperty.Register(
+            "ItemHeight", typeof(double), typeof(RegularItemsControl), new PropertyMetadata(ValueBoxes.Double200Box));
+
+        public double ItemHeight
+        {
+            get => (double) GetValue(ItemHeightProperty);
+            set => SetValue(ItemHeightProperty, value);
+        }
+
+        public static readonly DependencyProperty ItemMarginProperty = DependencyProperty.Register(
+            "ItemMargin", typeof(Thickness), typeof(RegularItemsControl), new PropertyMetadata(default(Thickness)));
+
+        public Thickness ItemMargin
+        {
+            get => (Thickness) GetValue(ItemMarginProperty);
+            set => SetValue(ItemMarginProperty, value);
+        }
+    }
+}