Generate the string that contains the version of this library instead…

… of using reflection.

src/Magick.NET/MagickNET.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Text;
 using ImageMagick.Configuration;
@@ -153,14 +152,7 @@ public static string ImageMagickVersion
     /// Gets the version of Magick.NET.
     /// </summary>
     public static string Version
-    {
-        get
-        {
-            var title = TypeHelper.GetCustomAttribute<AssemblyTitleAttribute>(typeof(MagickNET));
-            var version = TypeHelper.GetCustomAttribute<AssemblyFileVersionAttribute>(typeof(MagickNET));
-            return title.Title + " " + version.Version;
-        }
-    }
+        => MagickVersion.Version;
 
     /// <summary>
     /// Gets the ImageMagick delegate libraries.

src/Magick.NET/Properties/AssemblyInfo.cs

@@ -3,6 +3,8 @@
 
 using System;
 using System.Runtime.InteropServices;
+using ImageMagick.SourceGenerator;
 
+[assembly: MagickVersion]
 [assembly: ComVisible(false)]
 [assembly: CLSCompliant(false)]

src/Shared/TypeHelper.cs

@@ -8,10 +8,6 @@ namespace ImageMagick;
 
 internal static class TypeHelper
 {
-    public static T GetCustomAttribute<T>(Type type)
-        where T : Attribute
-        => (T)type.Assembly.GetCustomAttributes(typeof(T), false)[0];
-
     public static Stream GetManifestResourceStream(Type type, string resourcePath, string resourceName)
         => type.Assembly.GetManifestResourceStream(resourcePath + "." + resourceName)!;
 }

tools/Magick.NET.SourceGenerator/AssemblyInfo/MagickVersionAttribute.cs

@@ -0,0 +1,11 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+#nullable enable
+
+using System;
+
+namespace ImageMagick.SourceGenerator;
+
+[AttributeUsage(AttributeTargets.Assembly)]
+internal sealed class MagickVersionAttribute : Attribute;

tools/Magick.NET.SourceGenerator/AssemblyInfo/MagickVersionGenerator.cs

@@ -0,0 +1,58 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+#nullable enable
+
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+namespace ImageMagick.SourceGenerator;
+
+[Generator]
+internal class MagickVersionGenerator : IIncrementalGenerator
+{
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        context.RegisterPostInitializationOutput(context => context.AddAttributeSource<MagickVersionAttribute>());
+        context.RegisterAttributeCodeGenerator<MagickVersionAttribute, string>(GetVersion, GenerateCode);
+    }
+
+    private string GetVersion(GeneratorAttributeSyntaxContext context)
+    {
+        var assemblyAttributes = context.SemanticModel.Compilation.Assembly.GetAttributes();
+
+        var title = assemblyAttributes
+            .Single(attribute => attribute.AttributeClass?.ToDisplayString() == typeof(AssemblyTitleAttribute).FullName)
+            .ConstructorArguments.FirstOrDefault().Value?.ToString();
+
+        var version = assemblyAttributes
+            .Single(attribute => attribute.AttributeClass?.ToDisplayString() == typeof(AssemblyVersionAttribute).FullName)
+            .ConstructorArguments.FirstOrDefault().Value?.ToString();
+
+        if (title is null || version is null)
+            return "\"";
+
+        return $"{title} {version}";
+    }
+
+    private void GenerateCode(SourceProductionContext context, string version)
+    {
+        var codeBuilder = new CodeBuilder();
+        codeBuilder.AppendLine("#nullable enable");
+        codeBuilder.AppendLine();
+        codeBuilder.AppendLine("namespace ImageMagick;");
+        codeBuilder.AppendLine();
+
+        codeBuilder.AppendLine("internal static class MagickVersion");
+        codeBuilder.AppendOpenBrace();
+        codeBuilder.Append(@"public const string Version = """);
+        codeBuilder.Append(version);
+        codeBuilder.AppendLine(@""";");
+        codeBuilder.AppendCloseBrace();
+
+        context.AddSource("MagickVersion.g.cs", SourceText.From(codeBuilder.ToString(), Encoding.UTF8));
+    }
+}