尺寸测量功能界面

CanFly.Canvas/Model/Exception/InvalidShapeException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CanFly.Canvas.Model.Exception
+{
+    internal class InvalidShapeException : System.Exception
+    {
+    }
+}