diff --git a/Npoi.Mapper/src/Npoi.Mapper/Attributes/ColumnAttribute.cs b/Npoi.Mapper/src/Npoi.Mapper/Attributes/ColumnAttribute.cs
index 92a52a8..39115d2 100644
--- a/Npoi.Mapper/src/Npoi.Mapper/Attributes/ColumnAttribute.cs
+++ b/Npoi.Mapper/src/Npoi.Mapper/Attributes/ColumnAttribute.cs
@@ -4,6 +4,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Reflection;
+using LogicExtensions;
 
 namespace Npoi.Mapper.Attributes;
 
@@ -138,7 +139,7 @@ public ColumnAttribute(string name)
             return null;
         }
 
-        Getter ??= MapHelper.CreateConditionalGetter(host, PropertyFullPath);
+        Getter ??= PropertyFullPath.CreateConditionalGetter<T, object>(host, pathStartsWithHostType: true);
         return (Func<T, object>)Getter;
     }
 
@@ -149,7 +150,7 @@ public ColumnAttribute(string name)
             return null;
         }
 
-        Setter ??= MapHelper.CreateConditionalSetter(host, PropertyFullPath);
+        Setter ??= PropertyFullPath.CreateConditionalSetter<T, object>(host, pathStartsWithHostType: true);
         return (Action<T, object>)Setter;
     }
 
diff --git a/Npoi.Mapper/src/Npoi.Mapper/MapHelper.cs b/Npoi.Mapper/src/Npoi.Mapper/MapHelper.cs
index 645859d..5e4cc3f 100644
--- a/Npoi.Mapper/src/Npoi.Mapper/MapHelper.cs
+++ b/Npoi.Mapper/src/Npoi.Mapper/MapHelper.cs
@@ -485,123 +485,6 @@ public static (PropertyInfo propertyInfo, string fullPath) GetPropertyInfo<T>(st
         return (pi, fullPath);
     }
 
-    public static Expression<Func<T, object>> CreateSelectorExpression<T>(T host, string propertyFullPath)
-    {
-        if (host is null)
-        {
-            throw new ArgumentNullException(nameof(host));
-        }
-
-        var parts = propertyFullPath?.Split('.');
-        if (parts is null || parts.Length == 0)
-        {
-            throw new ArgumentException($"Property path is invalid: {propertyFullPath}", nameof(propertyFullPath));
-        }
-
-        if (parts.Length <= 1)
-        {
-            throw new ArgumentException($"Property full path should include the host type: {propertyFullPath}", nameof(propertyFullPath));
-        }
-
-        var hostType = host.GetType();
-        var param = Expression.Parameter(typeof(T), "x"); // T will be 'object' for dynamic
-        Expression body = Expression.Convert(param, hostType); // force convert to underlying type for dynamic
-
-        // Skip the first part, which is the host object type.
-        for (var i = 1; i < parts.Length; i++)
-        {
-            var member = parts[i];
-            body = Expression.PropertyOrField(body, member);
-        }
-
-        var selector = Expression.Lambda<Func<T, object>>(Expression.Convert(body, ObjectType), param);
-
-        return selector;
-    }
-
-    public static Func<T, object> CreateConditionalGetter<T>(T host, string propertyFullPath)
-    {
-        var selector = CreateSelectorExpression(host, propertyFullPath);
-        return CreateConditionalGetter(selector);
-    }
-
-    public static Func<T, object> CreateConditionalGetter<T>(Expression<Func<T, object>> propertySelector)
-    {
-        if (propertySelector is not LambdaExpression lambdaExpression)
-        {
-            throw new ArgumentException($"Unsupported property selector: {propertySelector}", nameof(propertySelector));
-        }
-
-        var body = lambdaExpression.Body;
-        var newBody = body;
-        while (body is MemberExpression or UnaryExpression{ Operand: MemberExpression })
-        {
-            var memberAccess = body as MemberExpression ?? (MemberExpression)((UnaryExpression)body).Operand;
-
-            if (!memberAccess.Expression.Type.IsValueType)
-            {
-                newBody = Expression.Condition(
-                    Expression.Equal(memberAccess.Expression, Expression.Constant(null)),
-                    Expression.Convert(Expression.Constant(null), ObjectType),
-                    newBody);
-            }
-
-            body = memberAccess.Expression;
-        }
-
-        newBody = Expression.Convert(newBody, ObjectType);
-        return Expression.Lambda<Func<T, object>>(newBody, propertySelector.Parameters.First()).Compile();
-    }
-
-    public static Action<T, object> CreateConditionalSetter<T>(T host, string propertyFullPath)
-    {
-        var selector = CreateSelectorExpression(host, propertyFullPath);
-        return CreateConditionalSetter(selector);
-    }
-
-    public static Action<T, object> CreateConditionalSetter<T>(Expression<Func<T, object>> propertySelector)
-    {
-        if (propertySelector is not LambdaExpression lambdaExpression)
-        {
-            throw new ArgumentException($"Unsupported property selector: {propertySelector}", nameof(propertySelector));
-        }
-
-        var writeableBody = lambdaExpression.Body is UnaryExpression { Operand: MemberExpression writeableMember }
-            ? writeableMember
-            : (MemberExpression)lambdaExpression.Body;
-        var newValueParam = Expression.Parameter(ObjectType, "v");
-
-        var rightExpression = Expression.Condition(// Write default value if the new value is null.
-            Expression.Equal(newValueParam, Expression.Constant(null)),
-            Expression.Default(writeableBody.Type),
-            Expression.Convert(newValueParam, writeableBody.Type));
-        var assignExpression = Expression.Assign(writeableBody, rightExpression);
-        var statements = new List<Expression> { assignExpression };
-
-        var innerBody = writeableBody.Expression;
-
-        while (innerBody is MemberExpression or UnaryExpression{ Operand: MemberExpression })
-        {
-            var memberAccess = innerBody as MemberExpression ?? (MemberExpression)((UnaryExpression)innerBody).Operand;
-
-            if (!memberAccess.Type.IsValueType)
-            {
-                var ifNullAssignNew = Expression.IfThen(
-                    Expression.Equal(memberAccess, Expression.Constant(null)),
-                    Expression.Assign(memberAccess, Expression.New(memberAccess.Type)));
-
-                statements.Add(ifNullAssignNew);
-            }
-
-            innerBody = memberAccess.Expression;
-        }
-
-        statements.Reverse();
-        var newBody = Expression.Block(statements);
-
-        return Expression.Lambda<Action<T, object>>(newBody, propertySelector.Parameters[0], newValueParam).Compile();
-    }
-
     /// <summary>
     /// Get refined name by removing specified chars and truncating by specified chars.
     /// </summary>
diff --git a/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj b/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
index aa5ffa5..7cc3c1e 100644
--- a/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
+++ b/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
@@ -30,10 +30,12 @@
   </PropertyGroup>
   
   <ItemGroup>
+    <PackageReference Include="LogicExtensions" Version="0.0.3" />
     <PackageReference Include="NPOI" Version="2.6.2" />
   </ItemGroup>
 
   <ItemGroup Label="SourceLink">
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
   </ItemGroup>
+  
 </Project>