支持 aot 构建减少反射代码实现

Author: lindexi

Workbench/Wmf/SkiaWmfRenderer/samples/sample/Sample.csproj

@@ -5,6 +5,7 @@
     <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
   </PropertyGroup>
 
   <ItemGroup>

Workbench/Wmf/SkiaWmfRenderer/src/wieslawsoltes-wmf/src/library/Library.csproj

@@ -24,6 +24,10 @@
 
   <ItemGroup>
     <PackageReference Include="dotnetCampus.LatestCSharpFeatures" Version="12.0.1" />
+    <PackageReference Include="dotnetCampus.Telescope.SourceGeneratorAnalyzers" Version="0.10.7-alpha21">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
 </Project>

Workbench/Wmf/SkiaWmfRenderer/src/wieslawsoltes-wmf/src/library/WmfHelper.cs

@@ -1,41 +1,55 @@
-using System;
+#nullable enable
+using Oxage.Wmf.Primitive;
+using Oxage.Wmf.Records;
+
+using System;
+using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Text;
-using Oxage.Wmf.Records;
 
 using Color = Oxage.Wmf.Primitive.WmfColor;
 using Point = Oxage.Wmf.Primitive.WmfPoint;
-using Oxage.Wmf.Primitive;
 
 namespace Oxage.Wmf
 {
-	public class WmfHelper
+	public partial class WmfHelper
 	{
-#if NET9_0_OR_GREATER
-        [RequiresDynamicCode("")]
-        [RequiresUnreferencedCode("xxx")]
-#endif
-		public static IBinaryRecord GetRecordByType(RecordType rt)
+		public static IBinaryRecord? GetRecordByType(RecordType rt)
 		{
-			var types = typeof(WmfHelper).Assembly.GetTypes();
-
-			foreach (var type in types)
-			{
-				if (typeof(IBinaryRecord).IsAssignableFrom(type))
-				{
-					var attribute = Attribute.GetCustomAttribute(type, typeof(WmfRecordAttribute)) as WmfRecordAttribute;
-					if (attribute != null && attribute.Type == rt)
-					{
-						var record = Activator.CreateInstance(type) as IBinaryRecord;
-						return record;
-					}
-				}
-			}
+            if (RecordCreatorDictionary.TryGetValue(rt,out var creator))
+            {
+                return creator.Creator();
+            }
 
 			return null;
 		}
 
-		public static Encoding GetAnsiEncoding()
+        private static Dictionary<RecordType, RecordCreator> RecordCreatorDictionary
+        {
+            get
+            {
+                if (_recordCreatorDictionary is null)
+                {
+                    var dictionary = new Dictionary<RecordType, RecordCreator>();
+                    foreach (var (type, attribute, creator) in ExportBinaryRecordEnumerable())
+                    {
+                        dictionary.Add(attribute.Type, new RecordCreator(type, attribute, creator));
+                    }
+                    _recordCreatorDictionary = dictionary;
+                }
+
+                return _recordCreatorDictionary;
+            }
+        }
+        
+        private static Dictionary<RecordType, RecordCreator>? _recordCreatorDictionary;
+
+        readonly record struct RecordCreator(Type Type, WmfRecordAttribute Attribute, Func<IBinaryRecord> Creator);
+
+        [dotnetCampus.Telescope.TelescopeExportAttribute()]
+        private static partial IEnumerable<(Type type, WmfRecordAttribute attribute, Func<IBinaryRecord> creator)> ExportBinaryRecordEnumerable();
+
+        public static Encoding GetAnsiEncoding()
 		{
 			//ANSI Encoding: http://weblogs.asp.net/ahoffman/archive/2004/01/19/60094.aspx
 			//Not sure, should be Encoding.Default? Documentation says "ANSI Character Set" but not specifically which code page