From e8931b32fc666a4ae822ca5a98cf1ccdc01f582a Mon Sep 17 00:00:00 2001
From: leisurelyclouds <leisurelyclouds@outlook.com>
Date: Sun, 5 May 2019 16:50:38 +0800
Subject: [PATCH] fix NullReferenceException (#335)

---
 src/DotNetCore.CAP/Diagnostics/TracingHeaders.cs | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/DotNetCore.CAP/Diagnostics/TracingHeaders.cs b/src/DotNetCore.CAP/Diagnostics/TracingHeaders.cs
index 11093d4..8fb7e21 100644
--- a/src/DotNetCore.CAP/Diagnostics/TracingHeaders.cs
+++ b/src/DotNetCore.CAP/Diagnostics/TracingHeaders.cs
@@ -9,7 +9,7 @@ namespace DotNetCore.CAP.Diagnostics
 {
     public class TracingHeaders : IEnumerable<KeyValuePair<string, string>>
     {
-        private List<KeyValuePair<string, string>> _dataStore;
+        private List<KeyValuePair<string, string>> _dataStore = new List<KeyValuePair<string, string>>();
 
         public IEnumerator<KeyValuePair<string, string>> GetEnumerator()
         {
@@ -23,11 +23,6 @@ namespace DotNetCore.CAP.Diagnostics
 
         public void Add(string name, string value)
         {
-            if (_dataStore == null)
-            {
-                _dataStore = new List<KeyValuePair<string, string>>();
-            }
-
             _dataStore.Add(new KeyValuePair<string, string>(name, value));
         }
 
@@ -46,4 +41,4 @@ namespace DotNetCore.CAP.Diagnostics
             _dataStore?.Clear();
         }
     }
-}
\ No newline at end of file
+}