在「Deedy.Testing」中添加TypeConverter示例

DeedyDesigner/Deedy.Activity/Helpers/VisualHelper.cs

@@ -157,7 +157,7 @@ namespace Deedy.Activity.Helpers
         /// </summary>
         /// <param name="geometryString">矢量图形的字符串表示形式</param>
         /// <returns>如果解析成功则返回「Geometry」对象</returns>
-        public static Geometry? Help_ParseAsGeometry(this string geometryString) => TypeDescriptor.GetConverter(typeof(Geometry)).ConvertFromString(geometryString) as Geometry;
+        public static PathGeometry? Help_ParseAsPathGeometry(this string geometryString) => TypeDescriptor.GetConverter(typeof(PathGeometry)).ConvertFromString(geometryString) as PathGeometry;
         /// <summary>
         /// 以图形中心点为中心沿顺时针旋转指定角度；再对一个矢量图形进行连续的「缩放」、「平移」到一个「Rectangle」
         /// </summary>

DeedyDesigner/Deedy.Testing/CustomTypeConverter.cs

@@ -0,0 +1,41 @@
+
+using System;
+using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+
+[TypeConverter(typeof(PointConverter))]
+public struct Point
+{
+    public double X { get; set; }
+    public double Y { get; set; }
+}
+
+public class PointConverter : TypeConverter
+{
+    public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType)
+        => sourceType == typeof(string);
+
+    public override object? ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object value)
+    {
+        var str = value as string;
+        if (string.IsNullOrEmpty(str)) return null;
+
+        var parts = str.Split(',');
+        return new Point
+        {
+            X = double.Parse(parts[0]),
+            Y = double.Parse(parts[1])
+        };
+    }
+
+    public override bool CanConvertTo(ITypeDescriptorContext? context, [NotNullWhen(true)] Type? destinationType)
+        => destinationType == typeof(string);
+
+    public override object? ConvertTo(ITypeDescriptorContext? context, CultureInfo? culture, object? value, Type destinationType)
+    {
+        if (value == null) return "";
+        var point = (Point)value;
+        return $"{point.X},{point.Y}";
+    }
+}