Added an unit test.

src/VS 2010/KingAOP.Tests/KingAOP.Tests.csproj

@@ -49,6 +49,7 @@
     <Compile Include="MethodBoundaryTests\OnEntry\Aspects.cs" />
     <Compile Include="MethodBoundaryTests\OnEntry\MyTestClass.cs" />
     <Compile Include="MethodBoundaryTests\OnEntry\OnEntryTests.cs" />
+    <Compile Include="MethodBoundaryTests\OnSuccess\Aspects.cs" />
     <Compile Include="MethodBoundaryTests\OnSuccess\IncrementArgumentValueAspect.cs" />
     <Compile Include="MethodBoundaryTests\OnSuccess\IncrementReturnValueAspect.cs" />
     <Compile Include="MethodBoundaryTests\OnSuccess\InitTestEntityAspect.cs" />

src/VS 2010/KingAOP.Tests/MethodBoundaryTests/OnEntry/MyTestClass.cs

@@ -1,6 +1,5 @@
 using System.Dynamic;
 using System.Linq.Expressions;
-using KingAOP.Tests.MethodInterceptionTests.OnInvoke;
 
 namespace KingAOP.Tests.MethodBoundaryTests.OnEntry
 {

src/VS 2010/KingAOP.Tests/MethodBoundaryTests/OnSuccess/Aspects.cs

@@ -0,0 +1,17 @@
+using KingAOP.Aspects;
+
+namespace KingAOP.Tests.MethodBoundaryTests.OnSuccess
+{
+    class ChangeArgumentAspect : OnMethodBoundaryAspect
+    {
+        public override void OnSuccess(MethodExecutionArgs args)
+        {
+            for (int i = 0; i < args.Arguments.Count; i++)
+            {
+                if (args.Arguments[i] is int) args.Arguments[i] = -1;
+
+                else if (args.Arguments[i] is string) args.Arguments[i] = "I changed your value";
+            }
+        }
+    }
+}

src/VS 2010/KingAOP.Tests/MethodBoundaryTests/OnSuccess/MyTestClass.cs

@@ -1,13 +1,14 @@
 using System;
 using System.Dynamic;
 using System.Linq.Expressions;
-using KingAOP.Core;
 using KingAOP.Tests.TestData;
 
 namespace KingAOP.Tests.MethodBoundaryTests.OnSuccess
 {
     internal class MyTestClass : IDynamicMetaObjectProvider
     {
+        public bool OriginalMethodCalled { get; private set; }
+
         [IncrementReturnValueAspect]
         public int ReturnArgumentValue(int number)
         {
@@ -33,6 +34,12 @@ public void InitTestEntity(TestEntity testEntity)
             testEntity.Number = 0;
         }
 
+        [ChangeArgumentAspect]
+        public void MethodWithRefArgs(ref int value)
+        {
+            OriginalMethodCalled = true;
+        }
+
         public DynamicMetaObject GetMetaObject(Expression parameter)
         {
             return new AspectWeaver(parameter, this);

src/VS 2010/KingAOP.Tests/MethodBoundaryTests/OnSuccess/OnSuccessTests.cs

@@ -38,5 +38,16 @@ public void OnSuccess_AfterCall_InitTestEntity_ShouldBeApplied_IncrementArgument
             Assert.AreEqual(entity.Name, "KingAOP_OnSuccess");
             Assert.AreEqual(entity.Number, 100);
         }
+
+        [TestMethod]
+        public void IntByRefArgumentShouldBeUpdatedByAspect()
+        {
+            dynamic test = new MyTestClass();
+
+            int value = 5;
+            test.MethodWithRefArgs(ref value);
+
+            Assert.IsTrue(value == -1);
+        }
     }
 }