add encodedpayloadsize

src/ndefpclib/record/NDEFRecord.cs

@@ -20,6 +20,10 @@ namespace ndefpclib.records
         /// <summary> Type of the message. </summary>
         private MsgType msgType;
 
+
+        /// <summary> Size of the encoded payload. </summary>
+        private int encodedPayloadSize = -1;
+
         #endregion
 
         #region  Constructors
@@ -35,7 +39,7 @@ namespace ndefpclib.records
         /// <param name="array">      The array. </param>
         /// <param name="headerSize"> The size of the header. </param>
         /// <param name="index">      (Optional) zero-based index of the. </param>
-        public NDEFRecord(byte[] array, int headerSize,int index = 0)
+        public NDEFRecord(byte[] array, int headerSize, int index = 0)
         {
             this.msgType = MsgType.GetType(array, index);
             this.HeaderSize = headerSize;
@@ -145,7 +149,29 @@ namespace ndefpclib.records
         {
             get
             {
-                return this.HeaderSize + this.Payload.Length + this.PayloadPraefix.Length;
+                return this.HeaderSize + this.EncodedPayloadSize + this.PayloadPraefix.Length;
+            }
+        }
+
+        /// <summary> Gets the size of the encoded payload. </summary>
+        /// <value> The size of the encoded payload. </value>
+        public int EncodedPayloadSize
+        {
+            get
+            {
+                if (this.encodedPayloadSize >= 0)
+                {
+                    return this.encodedPayloadSize;
+                }
+                else if (this.msgType != null && this.encodedPayloadSize < 0)
+                {
+                    this.encodedPayloadSize = this.msgType.Encoder.GetByteCount(this.Payload);
+                    return this.encodedPayloadSize;
+                }
+                else
+                {
+                    return this.Payload.Length;
+                }
             }
         }
 

src/ndefpclib/record/NDEFShortRecord.cs

@@ -56,7 +56,7 @@ namespace ndefpclib.records
 
             array[0] = this.FormatFlags;
             array[1] = NDEFRecord.TypeSize;
-            array[2] = (byte)(Payload.Length + this.PayloadPraefix.Length);
+            array[2] = (byte)(this.EncodedPayloadSize + this.PayloadPraefix.Length);
             array[3] = (byte)this.Type;
 
             int i = this.HeaderSize;