diff --git a/C#/source/Yitter.IdGenerator/Contract/ISnowWorker.cs b/C#/source/Yitter.IdGenerator/Contract/ISnowWorker.cs
index 93d1b19..7de1ae0 100644
--- a/C#/source/Yitter.IdGenerator/Contract/ISnowWorker.cs
+++ b/C#/source/Yitter.IdGenerator/Contract/ISnowWorker.cs
@@ -13,7 +13,7 @@
 
 namespace Yitter.IdGenerator
 {
-    internal interface ISnowWorker
+    public interface ISnowWorker
     {
         //Action<OverCostActionArg> GenAction { get; set; }
 
diff --git a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
index 07a0040..1c52a62 100644
--- a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
+++ b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
@@ -16,7 +16,7 @@ namespace Yitter.IdGenerator
     /// <summary>
     /// 雪花漂移算法
     /// </summary> 
-    internal class SnowWorkerM1 : ISnowWorker
+    public class SnowWorkerM1 : ISnowWorker
     {
         /// <summary>
         /// 基础时间
diff --git a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM2.cs b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM2.cs
index 14a12f9..e7e32dd 100644
--- a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM2.cs
+++ b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM2.cs
@@ -16,7 +16,7 @@ namespace Yitter.IdGenerator
     /// <summary>
     /// 常规雪花算法
     /// </summary>
-    internal class SnowWorkerM2 : SnowWorkerM1
+    public class SnowWorkerM2 : SnowWorkerM1
     {
         public SnowWorkerM2(IdGeneratorOptions options) : base(options)
         {
diff --git a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM3.cs b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM3.cs
index 4ad78a7..a2e4efe 100644
--- a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM3.cs
+++ b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM3.cs
@@ -16,7 +16,7 @@ namespace Yitter.IdGenerator
     /// <summary>
     /// 雪花漂移算法（支持数据中心ID和秒级时间戳）
     /// </summary> 
-    internal class SnowWorkerM3 : SnowWorkerM1
+    public class SnowWorkerM3 : SnowWorkerM1
     {
         /// <summary>
         /// 数据中心ID（默认0）
diff --git a/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs b/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
index ea4e2a9..89b3af5 100644
--- a/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
+++ b/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
@@ -19,7 +19,7 @@ namespace Yitter.IdGenerator
     /// </summary>
     public class DefaultIdGenerator : IIdGenerator
     {
-        private ISnowWorker _SnowWorker { get; set; }
+        protected virtual ISnowWorker _SnowWorker { get; set; }
 
         //public Action<OverCostActionArg> GenIdActionAsync
         //{
@@ -122,7 +122,7 @@ public DefaultIdGenerator(IdGeneratorOptions options)
         }
 
 
-        public long NewLong()
+        public virtual long NewLong()
         {
             return _SnowWorker.NextId();
         }