C# 7.0 features.

Algo/Export/Database/DbProviders/BaseDbProvider.cs

@@ -77,9 +77,9 @@ public void CreateIfNotExists(Table table)
 								return;
 						}
 
-						if (result is int)
+						if (result is int i)
 						{
-							if ((int)result != 0)
+							if (i != 0)
 								return;
 						}
 
@@ -206,8 +206,9 @@ protected virtual string GetDbType(Type type, object restriction)
 
 			if (type == typeof(decimal))
 			{
-				var drest = restriction as DecimalRestriction;
-				return drest != null ? $"decimal({drest.Precision},{drest.Scale})": "decimal";
+				return restriction is DecimalRestriction drest
+					? $"decimal({drest.Precision},{drest.Scale})"
+					: "decimal";
 			}
 
 			if (type == typeof(Enum))

Algo/Import/CsvImporter.cs

@@ -73,9 +73,7 @@ public void Import(string fileName, Action<int> updateProgress, Func<bool> isCan
 
 				foreach (var instance in Parse(fileName, isCancelled))
 				{
-					var secMsg = instance as SecurityMessage;
-
-					if (secMsg == null)
+					if (!(instance is SecurityMessage secMsg))
 					{
 						buffer.Add(instance);
 

Algo/Import/CsvParser.cs

@@ -165,9 +165,7 @@ public IEnumerable<dynamic> Parse(string fileName, Func<bool> isCancelled = null
 						}
 					}
 
-					var secMsg = instance as SecurityMessage;
-
-					if (secMsg == null)
+					if (!(instance is SecurityMessage secMsg))
 					{
 						if (instance is ExecutionMessage execMsg)
 							execMsg.ExecutionType = (ExecutionTypes)DataType.Arg;

Algo/MarketRuleHelper.cs

@@ -876,9 +876,7 @@ private void OnNewTrade(Trade trade)
 
 			private bool CheckTrades(Security security, Trade trade)
 			{
-				var basket = security as BasketSecurity;
-
-				return basket != null
+				return security is BasketSecurity basket
 					? basket.Contains(SecurityProvider, trade.Security) && _condition(trade.Security)
 					: trade.Security == security && _condition(trade.Security);
 			}

Algo/Storages/IExchangeInfoProvider.cs

@@ -267,8 +267,8 @@ public StorageExchangeInfoProvider(IEntityRegistry entityRegistry)
 
 			var boardCodes = new HashSet<string>();
 
-			var boardList = _entityRegistry.ExchangeBoards as ExchangeBoardList;
-			boardCodes.AddRange(boardList != null ? boardList.GetIds() : _entityRegistry.ExchangeBoards.Select(b => b.Code));
+			boardCodes.AddRange(_entityRegistry.ExchangeBoards is ExchangeBoardList boardList
+				? boardList.GetIds() : _entityRegistry.ExchangeBoards.Select(b => b.Code));
 
 			var boards = Boards.Where(b => !boardCodes.Contains(b.Code)).ToArray();
 

Algo/Storages/SecurityList.cs

@@ -59,9 +59,7 @@ public SecurityList(IEntityRegistry registry)
 		{
 			_registry = registry;
 
-			var database = Storage as Database;
-
-			if (database == null)
+			if (!(Storage is Database database))
 				return;
 
 			var readAllByCodeAndType = database.CommandType == CommandType.StoredProcedure

Algo/Strategies/StrategyHelper.cs

@@ -926,9 +926,7 @@ private static Strategy GetRuleStrategy(IMarketRule rule)
 			if (rule == null)
 				throw new ArgumentNullException(nameof(rule));
 
-			var strategy = rule.Container as Strategy;
-
-			if (strategy == null)
+			if (!(rule.Container is Strategy strategy))
 				throw new ArgumentException(LocalizedStrings.Str1263Params.Put(rule.Name), nameof(rule));
 
 			return strategy;

Algo/Testing/EmulationMessageAdapter.cs

@@ -118,8 +118,7 @@ protected override void OnSendInMessage(Message message)
 				case MessageTypes.Reset:
 					ProcessedMessageCount = 0;
 
-					var incGen = TransactionIdGenerator as IncrementalIdGenerator;
-					if (incGen != null)
+					if (TransactionIdGenerator is IncrementalIdGenerator incGen)
 						incGen.Current = Emulator.Settings.InitialTransactionId;
 
 					_currentTime = default(DateTimeOffset);

Algo/TraderHelper.cs

@@ -1354,9 +1354,7 @@ public static IEnumerable<MyTrade> GetTheoreticalTrades(this MarketDepth depth,
 
 				emulator.NewOutMessage += msg =>
 				{
-					var execMsg = msg as ExecutionMessage;
-
-					if (execMsg == null)
+					if (!(msg is ExecutionMessage execMsg))
 						return;
 
 					if (execMsg.Error != null)
@@ -1509,13 +1507,11 @@ public static void CancelOrders(this IConnector connector, IEnumerable<Order> or
 		public static bool Contains(this BasketSecurity basketSecurity, ISecurityProvider securityProvider, Security security)
 		{
 			return basketSecurity.GetInnerSecurities(securityProvider).Any(innerSecurity =>
-			{
-				var basket = innerSecurity as BasketSecurity;
-
-				if (basket == null)
-					return innerSecurity == security;
-
-				return basket.Contains(securityProvider, security);
+			{
+				if (innerSecurity is BasketSecurity basket)
+					return basket.Contains(securityProvider, security);
+
+				return innerSecurity == security;
 			});
 		}
 

BusinessEntities/MarketDepth.cs

@@ -669,9 +669,7 @@ private void SetQuote(Quote quote, bool isAggregate)
 
 						if (UseAggregatedQuotes)
 						{
-							var aggQuote = existedQuote as AggregatedQuote;
-
-							if (aggQuote == null)
+							if (!(existedQuote is AggregatedQuote aggQuote))
 							{
 								aggQuote = new AggregatedQuote
 								{

Documentation/DocViewer/XMLCommToHTM/GenerateHtml_Member.cs

@@ -117,8 +117,7 @@ static string GetMethodKindName(MemberDom m)
 
 		static XElement BuildReturns(MemberDom m)
 		{
-			var meth= m as MethodDom;
-			if (meth == null)
+			if (!(m is MethodDom meth))
 				return BuildMemberType(m);
 			if (meth.MemberType==null || meth.MemberType == typeof(void))
 				return null;

Messages/SecurityId.cs

@@ -196,8 +196,7 @@ private int EnsureGetHashCode()
 		/// <returns><see langword="true" />, if the specified object is equal to the current object, otherwise, <see langword="false" />.</returns>
 		public override bool Equals(object other)
 		{
-			var secId = other as SecurityId?;
-			return secId != null && Equals(secId.Value);
+			return other is SecurityId secId && Equals(secId);
 		}
 
 		/// <summary>

Samples/Chart/SampleChartActiveOrders/MainWindow.xaml.cs

@@ -248,8 +248,7 @@ private void Error(string msg)
 
 		private void Fill_Click(object sender, RoutedEventArgs e)
 		{
-			var order = _ordersListBox.SelectedItem as Order;
-			if (order == null)
+			if (!(_ordersListBox.SelectedItem is Order order))
 				return;
 
 			if (IsInFinalState(order))
@@ -272,8 +271,7 @@ private void Fill_Click(object sender, RoutedEventArgs e)
 
 		private void Remove_Click(object sender, RoutedEventArgs e)
 		{
-			var order = _ordersListBox.SelectedItem as Order;
-			if (order == null)
+			if (!(_ordersListBox.SelectedItem is Order order))
 				return;
 
 			Log($"Remove order: {order}");