Issue #94: Added event handler OnBookEvent (MT5).

MtApi5/Events/Mt5EventTypes.cs

@@ -2,6 +2,7 @@
 {
     internal enum Mt5EventTypes
     {
-        OnTradeTransaction = 1
+        OnTradeTransaction = 1,
+        OnBookEvent        = 2
     }
 }

MtApi5/Events/OnBookEvent.cs

@@ -0,0 +1,7 @@
+namespace MtApi5.Events
+{
+    internal class OnBookEvent
+    {
+        public string Symbol { get; set; }
+    }
+}

MtApi5/Mt5BookEventArgs.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace MtApi5
+{
+    public class Mt5BookEventArgs : EventArgs
+    {
+        public int ExpertHandle { get; set; }
+        public string Symbol { get; set; }      //Symbol of OnBookEvent event.
+    }
+}

MtApi5/MtApi5.csproj

@@ -48,6 +48,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CopyTicksFlag.cs" />
+    <Compile Include="Events\OnBookEvent.cs" />
     <Compile Include="Events\OnTradeTransactionEvent.cs" />
     <Compile Include="MqlBookInfo.cs" />
     <Compile Include="MqlParam.cs" />
@@ -55,6 +56,7 @@
     <Compile Include="MqlTick.cs" />
     <Compile Include="MqlTradeCheckResult.cs" />
     <Compile Include="MqlTradeTransaction.cs" />
+    <Compile Include="Mt5BookEventArgs.cs" />
     <Compile Include="Mt5TimeConverter.cs" />
     <Compile Include="Mt5Enums.cs" />
     <Compile Include="Mt5ConnectionEventArgs.cs" />

MtApi5/MtApi5Client.cs

@@ -2387,6 +2387,7 @@ namespace MtApi5
         public event EventHandler<Mt5QuoteEventArgs> QuoteRemoved;
         public event EventHandler<Mt5ConnectionEventArgs> ConnectionStateChanged;
         public event EventHandler<Mt5TradeTransactionEventArgs> OnTradeTransaction;
+        public event EventHandler<Mt5BookEventArgs> OnBookEvent;
         #endregion
 
         #region Private Methods
@@ -2464,6 +2465,9 @@ namespace MtApi5
                 case Mt5EventTypes.OnTradeTransaction:
                     ReceivedOnTradeTransaction(e.ExpertHandle, e.Payload);
                     break;
+                case Mt5EventTypes.OnBookEvent:
+                    ReceivedOnBookEvent(e.ExpertHandle, e.Payload);
+                    break;
                 default:
                     throw new ArgumentOutOfRangeException();
             }
@@ -2481,6 +2485,16 @@ namespace MtApi5
             });
         }
 
+        private void ReceivedOnBookEvent(int expertHandler, string payload)
+        {
+            var e = JsonConvert.DeserializeObject<OnBookEvent>(payload);
+            OnBookEvent?.Invoke(this, new Mt5BookEventArgs
+            {
+                ExpertHandle = expertHandler,
+                Symbol = e.Symbol
+            });
+        }
+
         private void Connect(string host, int port)
         {
             var client = new MtClient(host, port);