From 189dff08a7ebd387a241f2e3c45387f427e4cda7 Mon Sep 17 00:00:00 2001
From: parallelbgls <parallelbgls@outlook.com>
Date: Fri, 19 May 2017 10:41:41 +0800
Subject: [PATCH] Bug Fix

---
 Modbus.Net/src/Base.Common/BaseProtocal.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Modbus.Net/src/Base.Common/BaseProtocal.cs b/Modbus.Net/src/Base.Common/BaseProtocal.cs
index 1ab664a..3873ac5 100644
--- a/Modbus.Net/src/Base.Common/BaseProtocal.cs
+++ b/Modbus.Net/src/Base.Common/BaseProtocal.cs
@@ -80,10 +80,11 @@ namespace Modbus.Net
             get
             {
                 var protocalName = type.FullName;
+                TProtocalUnit protocalUnitReturn = null;
                 lock (Protocals)
                 {
                     if (Protocals.ContainsKey(protocalName))
-                        return Protocals[protocalName];
+                        protocalUnitReturn = Protocals[protocalName];
                     //自动寻找存在的协议并将其加载
                     var protocalUnit =
                         Activator.CreateInstance(type.GetTypeInfo().Assembly.GetType(protocalName)) as TProtocalUnit;
@@ -92,7 +93,7 @@ namespace Modbus.Net
                     protocalUnit.Endian = Endian;
                     Register(protocalUnit);
                 }
-                return Protocals[protocalName];
+                return protocalUnitReturn ?? Protocals[protocalName];
             }
         }