Исправил AllowDrop

ProjectLiner/ProjectLiner/FormLinerConfig.Designer.cs

@@ -89,6 +89,7 @@
             // 
             // labelBodyColor
             // 
+            labelBodyColor.AllowDrop = true;
             labelBodyColor.BorderStyle = BorderStyle.FixedSingle;
             labelBodyColor.Font = new Font("Segoe UI", 9.818182F, FontStyle.Regular, GraphicsUnit.Point);
             labelBodyColor.Location = new Point(20, 14);
@@ -102,6 +103,7 @@
             // 
             // labelAdditionslColor
             // 
+            labelAdditionslColor.AllowDrop = true;
             labelAdditionslColor.BorderStyle = BorderStyle.FixedSingle;
             labelAdditionslColor.Location = new Point(146, 14);
             labelAdditionslColor.Name = "labelAdditionslColor";

ProjectLiner/ProjectLiner/FormLinerConfig.cs

@@ -1,6 +1,7 @@
 
 using ProjectLiner.Drawnings;
 using ProjectLiner.Entities;
+using static System.Windows.Forms.VisualStyles.VisualStyleElement.TrackBar;
 
 namespace ProjectLiner;
 
@@ -120,35 +121,69 @@ public partial class FormLinerConfig : Form
         }
     }
 
-    private void labelBodyColor_DragDrop(object sender, DragEventArgs e)
-    {
-        if (_commonLiner == null)
-            return;
-        _commonLiner.EntityCommonLiner?.SetBodyColor((Color)e.Data.GetData(typeof(Color)));
-        DrawObject();
-    }
 
+    /// <summary>
+    /// Передача основного цвета
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="e"></param>
     private void labelBodyColor_DragEnter(object sender, DragEventArgs e)
     {
         if (e.Data.GetDataPresent(typeof(Color)))
+        {
             e.Effect = DragDropEffects.Copy;
+        }
         else
+        {
             e.Effect = DragDropEffects.None;
+        }
     }
 
+    /// <summary>
+    /// Прорисовка основным цветом
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="e"></param>
+    private void labelBodyColor_DragDrop(object sender, DragEventArgs e)
+    {
+        if (_commonLiner != null)
+        {
+            _commonLiner.EntityCommonLiner?.SetBodyColor((Color)e.Data.GetData(typeof(Color)));
+            DrawObject();
+        }
+    }
+
+    /// <summary>
+    /// Прорисовка дополнительным цветом
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="e"></param>
     private void labelAdditionalColor_DragDrop(object sender, DragEventArgs e)
     {
         if (_commonLiner?.EntityCommonLiner is EntityLiner _liner)
-            _liner?.SetAdditionalColor((Color)e.Data.GetData(typeof(Color)));
+        {
+            _liner.SetAdditionalColor((Color)e.Data.GetData(typeof(Color)));
+        }
         DrawObject();
     }
 
+    /// <summary>
+    /// Передача дополнительного цвета
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="e"></param>
     private void labelAdditionalColor_DragEnter(object sender, DragEventArgs e)
     {
-        if (e.Data.GetDataPresent(typeof(Color)))
+        if (_commonLiner is DrawningLiner)
-            e.Effect = DragDropEffects.Copy;
+        {
-        else
+            if (e.Data.GetDataPresent(typeof(Color)))
-            e.Effect = DragDropEffects.None;
+            {
+                e.Effect = DragDropEffects.Copy;
+            }
+            else
+            {
+                e.Effect = DragDropEffects.None;
+            }
+        }
     }
-
 }