Fix AbstractDynamicLinqCustomTypeProvider.ResolveTypeBySimpleName to use AdditionalTypes

src/System.Linq.Dynamic.Core/CustomTypeProviders/AbstractDynamicLinqCustomTypeProvider.cs

@@ -66,16 +66,11 @@ protected Type[] FindTypesMarkedWithDynamicLinqTypeAttribute(IEnumerable<Assembl
         Check.NotNull(assemblies);
         Check.NotEmpty(simpleTypeName);
 
-        var types = FindTypesMarkedWithDynamicLinqTypeAttribute(assemblies);
+        var types = FindTypesMarkedWithDynamicLinqTypeAttribute(assemblies).Union(AdditionalTypes);
         var fullNames = types.Select(t => t.FullName!).Distinct().ToArray();
         var firstMatchingFullname = fullNames.FirstOrDefault(fn => fn.EndsWith($".{simpleTypeName}"));
 
-        if (firstMatchingFullname == null)
-        {
-            return null;
-        }
-
-        return types.FirstOrDefault(t => t.FullName == firstMatchingFullname);
+        return firstMatchingFullname == null ? null : types.FirstOrDefault(t => t.FullName == firstMatchingFullname);
     }
 
 #if (UAP10_0 || NETSTANDARD)

test/System.Linq.Dynamic.Core.Tests/CustomTypeProviders/DefaultDynamicLinqCustomTypeProviderTests.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq.Dynamic.Core.CustomTypeProviders;
+using System.Linq.Dynamic.Core.Tests.TestClasses;
 using FluentAssertions;
 using NFluent;
 using Xunit;
@@ -61,4 +62,34 @@ public void DefaultDynamicLinqCustomTypeProvider_ResolveType_DefinedReturnsType(
         // Assert
         Check.That(result).IsNotNull();
     }
+
+    [Fact]
+    public void DefaultDynamicLinqCustomTypeProvider_ResolveTypeBySimpleName_UsesAdditionalTypes()
+    {
+        // Act
+        var result = _sut.ResolveTypeBySimpleName(nameof(TestClassWithDynamicLinqAttribute));
+
+        // Assert
+        Check.That(result).IsNotNull();
+    }
+
+    [Fact]
+    public void DefaultDynamicLinqCustomTypeProvider_ResolveTypeBySimpleName_UsesTypesMarkedWithDynamicLinqTypeAttribute()
+    {
+        // Act
+        var result = _sut.ResolveTypeBySimpleName(nameof(DirectoryInfo));
+
+        // Assert
+        Check.That(result).IsNotNull();
+    }
+
+    [Fact]
+    public void DefaultDynamicLinqCustomTypeProvider_ResolveTypeBySimpleName_UnknownReturnsNull()
+    {
+        // Act
+        var result = _sut.ResolveTypeBySimpleName("Dummy123");
+
+        // Assert
+        Check.That(result).IsNull();
+    }
 }

test/System.Linq.Dynamic.Core.Tests/TestClasses/TestClassWithDynamicLinqAttribute.cs

@@ -0,0 +1,8 @@
+using System.Linq.Dynamic.Core.CustomTypeProviders;
+
+namespace System.Linq.Dynamic.Core.Tests.TestClasses;
+
+[DynamicLinqType]
+internal class TestClassWithDynamicLinqAttribute
+{
+}