* UIGroupBox: 解决BackColor,FillColor设置为透明时，标题下面会出现横线

SunnyUI/Common/UGDI.cs

@@ -300,6 +300,83 @@ namespace Sunny.UI
             return path;
         }
 
+        /// <summary>
+        /// 创建圆角路径
+        /// </summary>
+        /// <param name="rect">区域</param>
+        /// <param name="radius">圆角大小</param>
+        /// <param name="radiusSides">圆角的方位</param>
+        /// <param name="lineSize">线宽</param>
+        /// <returns></returns>
+        internal static GraphicsPath CreateRoundedRectanglePathWithoutTop(this Rectangle rect, int radius, UICornerRadiusSides radiusSides, int lineSize = 1)
+        {
+            GraphicsPath path;
+
+            if (radiusSides == UICornerRadiusSides.None || radius == 0)
+            {
+                path = new GraphicsPath();
+                path.AddLine(new Point(rect.X, rect.Y), new Point(rect.X, rect.Y + rect.Height));
+                path.AddLine(new Point(rect.X, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height));
+                path.AddLine(new Point(rect.X + rect.Width, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y));
+            }
+            else
+            {
+                //IsRadius为True时，显示左上圆角
+                bool RadiusLeftTop = radiusSides.GetValue(UICornerRadiusSides.LeftTop);
+                //IsRadius为True时，显示左下圆角
+                bool RadiusLeftBottom = radiusSides.GetValue(UICornerRadiusSides.LeftBottom);
+                //IsRadius为True时，显示右上圆角
+                bool RadiusRightTop = radiusSides.GetValue(UICornerRadiusSides.RightTop);
+                //IsRadius为True时，显示右下圆角
+                bool RadiusRightBottom = radiusSides.GetValue(UICornerRadiusSides.RightBottom);
+                path = rect.CreateRoundedRectanglePathWithoutTop(radius, RadiusLeftTop, RadiusRightTop, RadiusRightBottom, RadiusLeftBottom, lineSize);
+            }
+
+            return path;
+        }
+
+        internal static GraphicsPath CreateRoundedRectanglePathWithoutTop(this Rectangle rect, int radius,
+    bool cornerLeftTop = true, bool cornerRightTop = true, bool cornerRightBottom = true, bool cornerLeftBottom = true,
+    int lineSize = 1)
+        {
+            GraphicsPath path = new GraphicsPath();
+
+            if ((!cornerLeftTop && !cornerRightTop && !cornerRightBottom && !cornerLeftBottom) || radius <= 0)
+            {
+                path.AddLine(new Point(rect.X, rect.Y), new Point(rect.X, rect.Y + rect.Height));
+                path.AddLine(new Point(rect.X, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height));
+                path.AddLine(new Point(rect.X + rect.Width, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y));
+            }
+            else
+            {
+                radius *= lineSize;
+
+                if (cornerRightTop)
+                    path.AddArc(rect.X + rect.Width - radius, rect.Y, radius, radius, 270, 90);
+                else
+                    path.AddLine(new Point(rect.X + rect.Width - 1, rect.Y), new Point(rect.X + rect.Width, rect.Y));
+
+                if (cornerRightBottom)
+                    path.AddArc(rect.X + rect.Width - radius, rect.Y + rect.Height - radius, radius, radius, 0, 90);
+                else
+                    path.AddLine(new Point(rect.X + rect.Width, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height));
+
+                if (cornerLeftBottom)
+                    path.AddArc(rect.X, rect.Bottom - radius, radius, radius, 90, 90);
+                else
+                    path.AddLine(new Point(rect.X + 1, rect.Y + rect.Height), new Point(rect.X, rect.Y + rect.Height));
+
+                if (cornerLeftTop)
+                    path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
+                else
+                    path.AddLine(new Point(rect.X, rect.Y + 1), new Point(rect.X, rect.Y));
+
+                //path.CloseFigure();
+            }
+
+            return path;
+        }
+
         /// <summary>
         /// 绘图路径
         /// </summary>

SunnyUI/Controls/UIDataGridView.cs

@@ -368,7 +368,29 @@ namespace Sunny.UI
             int idx = VBar.Value;
             if (idx < 0) idx = 0;
             if (idx >= RowCount) idx = RowCount - 1;
-            FirstDisplayedScrollingRowIndex = idx;
+
+            int lastFrozen = 0;
+            if (Rows[0].Frozen)
+            {
+                for (int i = 0; i < Rows.Count; i++)
+                {
+                    if (Rows[i].Frozen)
+                    {
+                        lastFrozen = i;
+                    }
+                    else
+                    {
+                        break;
+                    }
+                }
+            }
+
+            if (Rows[0].Frozen)
+            {
+
+            }
+
+            FirstDisplayedScrollingRowIndex = Math.Max(idx, lastFrozen);
         }
 
         private void HorizontalScrollBar_ValueChanged(object sender, EventArgs e)

SunnyUI/Controls/UIGroupBox.cs

@@ -20,6 +20,7 @@
  * 2020-04-25: V2.2.4 更新主题配置类
  * 2022-05-30: V3.1.9 修复Padding设置
  * 2023-05-13: V3.3.6 重构DrawString函数
+ * 2023-07-11: V3.4.0 解决BackColor,FillColor设置为透明时，标题下面会出现横线
 ******************************************************************************/
 
 using System;
@@ -56,8 +57,22 @@ namespace Sunny.UI
         /// <param name="path">绘图路径</param>
         protected override void OnPaintRect(Graphics g, GraphicsPath path)
         {
-            path = new Rectangle(0, TitleTop, Width - 1, Height - _titleTop - 1).CreateRoundedRectanglePath(Radius, RadiusSides);
+            if (RectSides == ToolStripStatusLabelBorderSides.None)
-            base.OnPaintRect(g, path);
+            {
+                return;
+            }
+
+            var rect = new Rectangle(0, TitleTop, Width - 1, Height - _titleTop - 1);
+            if (Text.IsValid())
+            {
+                path = rect.CreateRoundedRectanglePathWithoutTop(Radius, RadiusSides, RectSize);
+                g.DrawPath(GetRectColor(), path, true, RectSize);
+            }
+            else
+            {
+                path = rect.CreateRoundedRectanglePath(Radius, RadiusSides, RectSize);
+                g.DrawPath(GetRectColor(), path, true, RectSize);
+            }
         }
 
         /// <summary>
@@ -67,7 +82,29 @@ namespace Sunny.UI
         /// <param name="path">绘图路径</param>
         protected override void OnPaintFore(Graphics g, GraphicsPath path)
         {
+            Size size = TextRenderer.MeasureText(Text, Font);
             g.DrawString(Text, Font, ForeColor, FillColor, new Rectangle(TitleInterval, 0, Width - TitleInterval * 2, TitleTop * 2), TitleAlignment);
+
+            if (RectSides.GetValue(ToolStripStatusLabelBorderSides.Top))
+            {
+                if (RadiusSides.GetValue(UICornerRadiusSides.LeftTop))
+                {
+                    g.DrawLine(RectColor, Radius / 2 * RectSize, TitleTop, TitleInterval, TitleTop, true, RectSize);
+                }
+                else
+                {
+                    g.DrawLine(RectColor, 0, TitleTop, TitleInterval, TitleTop, true, RectSize);
+                }
+
+                if (RadiusSides.GetValue(UICornerRadiusSides.RightTop))
+                {
+                    g.DrawLine(RectColor, TitleInterval + size.Width, TitleTop, Width - Radius / 2 * RectSize, TitleTop, true, RectSize);
+                }
+                else
+                {
+                    g.DrawLine(RectColor, TitleInterval + size.Width, TitleTop, Width, TitleTop, true, RectSize);
+                }
+            }
         }
 
         private int _titleTop = 16;