add StringBuilder, sample

NwNsgProject/classes.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Globalization;
+using System.Text;
 using System.Text.RegularExpressions;
 using Newtonsoft.Json;
 
@@ -41,10 +42,13 @@ class NSGFlowLogTuple
         if (version >= 2.0)
         {
             flowState = parts[8];
-            packetsStoD = parts[9];
-            bytesStoD = parts[10];
-            packetsDtoS = parts[11];
-            bytesDtoS = parts[12];
+            if (flowState != "B")
+            {
+                packetsStoD = parts[9];
+                bytesStoD = parts[10];
+                packetsDtoS = parts[11];
+                bytesDtoS = parts[12];
+            }
         }
     }
 
@@ -55,38 +59,43 @@ class NSGFlowLogTuple
 
     public override string ToString()
     {
-        string temp = "";
-        temp += "rt=" + (Convert.ToUInt64(startTime) * 1000).ToString();
-        temp += " src=" + sourceAddress;
-        temp += " dst=" + destinationAddress;
-        temp += " spt=" + sourcePort;
-        temp += " dpt=" + destinationPort;
-        temp += " proto=" + (transportProtocol == "U" ? "UDP" : "TCP");
-        temp += " deviceDirection=" + (deviceDirection == "I" ? "0" : "1");
-        temp += " act=" + deviceAction;
+        var temp = new StringBuilder();
+        temp.Append("rt=").Append((Convert.ToUInt64(startTime) * 1000).ToString());
+        temp.Append(" src=").Append(sourceAddress);
+        temp.Append(" dst=").Append(destinationAddress);
+        temp.Append(" spt=").Append(sourcePort);
+        temp.Append(" dpt=").Append(destinationPort);
+        temp.Append(" proto=").Append((transportProtocol == "U" ? "UDP" : "TCP"));
+        temp.Append(" deviceDirection=").Append((deviceDirection == "I" ? "0" : "1"));
+        temp.Append(" act=").Append(deviceAction);
 
         if (schemaVersion >= 2.0)
         {
             // add fields from version 2 schema
-            temp += String.Format(" cs2={0}", flowState);
-            temp += String.Format(" cs2Label=FlowState");
-            temp += String.Format(" cn1={0}", packetsStoD);
-            temp += String.Format(" cn1Label=PacketsStoD");
-            temp += String.Format(" cn2={0}", packetsDtoS);
-            temp += String.Format(" cn2Label=PacketsDtoS");
+            temp.Append(" cs2=").Append(flowState);
+            temp.Append(" cs2Label=FlowState");
 
-            if (deviceDirection == "I")
+            if (flowState != "B")
             {
-                temp += String.Format(" bytesIn={0}", bytesStoD);
-                temp += String.Format(" bytesOut={0}", bytesDtoS);
-            } else
-            {
-                temp += String.Format(" bytesIn={0}", bytesDtoS);
-                temp += String.Format(" bytesOut={0}", bytesStoD);
+                temp.Append(" cn1=").Append(packetsStoD);
+                temp.Append(" cn1Label=PacketsStoD");
+                temp.Append(" cn2=").Append(packetsDtoS);
+                temp.Append(" cn2Label=PacketsDtoS");
+
+                if (deviceDirection == "I")
+                {
+                    temp.Append(" bytesIn={0}").Append(bytesStoD);
+                    temp.Append(" bytesOut={0}").Append(bytesDtoS);
+                }
+                else
+                {
+                    temp.Append(" bytesIn={0}").Append(bytesDtoS);
+                    temp.Append(" bytesOut={0}").Append(bytesStoD);
+                }
             }
         }
 
-        return temp;
+        return temp.ToString();
     }
 }
 
@@ -97,15 +106,15 @@ class NSGFlowLogsInnerFlows
 
     public string MakeMAC()
     {
-        string temp = "";
-        temp += mac.Substring(0, 2) + ":";
-        temp += mac.Substring(2, 2) + ":";
-        temp += mac.Substring(4, 2) + ":";
-        temp += mac.Substring(6, 2) + ":";
-        temp += mac.Substring(8, 2) + ":";
-        temp += mac.Substring(10, 2);
+        var temp = new StringBuilder();
+        temp.Append(mac.Substring(0, 2)).Append(":");
+        temp.Append(mac.Substring(2, 2)).Append(":");
+        temp.Append(mac.Substring(4, 2)).Append(":");
+        temp.Append(mac.Substring(6, 2)).Append(":");
+        temp.Append(mac.Substring(8, 2)).Append(":");
+        temp.Append(mac.Substring(10, 2));
 
-        return temp;
+        return temp.ToString();
     }
 }