fix: start Fix

Author: DocSvartz

src/Mapster.Async.Tests/AsyncTest.cs

@@ -1,8 +1,9 @@
-using System;
-using System.Threading.Tasks;
 using MapsterMapper;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Shouldly;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 
 namespace Mapster.Async.Tests
 {
@@ -18,12 +19,20 @@ public static void Setup(TestContext context)
         [TestMethod]
         public async Task Async()
         {
-            TypeAdapterConfig<Poco, Dto>.NewConfig()
-                .AfterMappingAsync(async dest => { dest.Name = await GetName(); });
+            // Arrange
+            var fooDto = new FooDto();
 
-            var poco = new Poco {Id = "foo"};
-            var dto = await poco.BuildAdapter().AdaptToTypeAsync<Dto>();
-            dto.Name.ShouldBe("bar");
+
+            TypeAdapterConfig.GlobalSettings.Default
+                .AddDestinationTransform(DestinationTransform.EmptyCollectionIfNull);
+
+            // Act
+            var foo = fooDto.Adapt<Foo>();
+
+            var str = fooDto.BuildAdapter().CreateMapExpression<Foo>();
+
+            // Assert
+            foo.Strings.ShouldNotBeNull();
         }
 
 
@@ -138,6 +147,17 @@ private static async Task<DtoOwner> GetOwner(string id)
         }
     }
 
+
+
+    class FooDto
+    {
+        public string[] Strings { get; set; }
+    }
+
+    record Foo(List<string> Strings);
+
+
+
     public class Poco
     {
         public string Id { get; set; }

src/Mapster.Async.Tests/Mapster.Async.Tests.csproj

@@ -7,7 +7,6 @@
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-    <TargetFrameworks>$(TargetFrameworks);net48</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/Mapster/Utils/ExpressionEx.cs

@@ -344,6 +344,13 @@ public static bool CanBeNull(this Expression exp)
             return visitor.CanBeNull.GetValueOrDefault();
         }
 
+        public static bool CanBeNullParam(this Expression exp)
+        {
+            var visitor = new NullableExpressionVisitor();
+            visitor.Visit(exp);
+            return visitor.CanBeNull.GetValueOrDefault();
+        }
+
         public static bool IsComplex(this Expression exp)
         {
             var visitor = new ComplexExpressionVisitor();
@@ -456,6 +463,9 @@ public static Expression ApplyNullPropagationFromCtor(this Expression getter, Ex
                 .Where(x=> !object.ReferenceEquals(x.arg,arg))
                 .Select(x=>x.param?.Type);
 
+            if (!adapt.CanBeNullParam() && adapt is BinaryExpression)
+                return adapt;
+
             while (current != null) 
             {
                 Expression? compareNull = null;