修复线程bug

AppStart/TestHelper.cs

@@ -32,9 +32,9 @@ namespace MySystem
             thread3.Start();
 
             
-            Thread thread3 = new Thread(ImportVirtualCard);
-            thread3.IsBackground = true;
-            thread3.Start();            
+            Thread thread4 = new Thread(ImportVirtualCard);
+            thread4.IsBackground = true;
+            thread4.Start();            
         }
 
         public void ImportPostDo()