From c1b2b62dbcf1d26467a6a3e909b76a0aa355c2ba Mon Sep 17 00:00:00 2001
From: JKorf <jankorf91@gmail.com>
Date: Sun, 2 Nov 2025 15:17:44 +0100
Subject: [PATCH] Added AliasType to specify only one way conversion for
 AssetAliases

---
 CryptoExchange.Net/Objects/AssetAlias.cs      | 22 ++++++++++++++++++-
 .../Objects/AssetAliasConfiguration.cs        | 14 ++++++++++--
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/CryptoExchange.Net/Objects/AssetAlias.cs b/CryptoExchange.Net/Objects/AssetAlias.cs
index 5829d09..5ef6bc7 100644
--- a/CryptoExchange.Net/Objects/AssetAlias.cs
+++ b/CryptoExchange.Net/Objects/AssetAlias.cs
@@ -9,6 +9,10 @@ namespace CryptoExchange.Net.Objects
     /// </summary>
     public class AssetAlias
     {
+        /// <summary>
+        /// Alias type
+        /// </summary>
+        public AliasType Type { get; set; }
         /// <summary>
         /// The name of the asset on the exchange
         /// </summary>
@@ -21,10 +25,26 @@ namespace CryptoExchange.Net.Objects
         /// <summary>
         /// ctor
         /// </summary>
-        public AssetAlias(string exchangeName, string commonName)
+        public AssetAlias(string exchangeName, string commonName, AliasType type = AliasType.BothWays)
         {
             ExchangeAssetName = exchangeName;
             CommonAssetName = commonName;
+            Type = type;
         }
     }
+
+    /// <summary>
+    /// Alias type
+    /// </summary>
+    public enum AliasType
+    {
+        /// <summary>
+        /// Translate both from and to exchange
+        /// </summary>
+        BothWays,
+        /// <summary>
+        /// Only translate when converting to exchange
+        /// </summary>
+        OnlyToExchange
+    }
 }
diff --git a/CryptoExchange.Net/Objects/AssetAliasConfiguration.cs b/CryptoExchange.Net/Objects/AssetAliasConfiguration.cs
index ab5622f..763b6ec 100644
--- a/CryptoExchange.Net/Objects/AssetAliasConfiguration.cs
+++ b/CryptoExchange.Net/Objects/AssetAliasConfiguration.cs
@@ -23,12 +23,22 @@ namespace CryptoExchange.Net.Objects
         /// <summary>
         /// Map the common name to an exchange name for an asset. If there is no alias the input name is returned
         /// </summary>
-        public string CommonToExchangeName(string commonName) => !AutoConvertEnabled ? commonName : Aliases.SingleOrDefault(x => x.CommonAssetName == commonName)?.ExchangeAssetName ?? commonName;
+        public string CommonToExchangeName(string commonName) => !AutoConvertEnabled ? commonName : Aliases.FirstOrDefault(x => x.CommonAssetName == commonName)?.ExchangeAssetName ?? commonName;
 
         /// <summary>
         /// Map the exchange name to a common name for an asset. If there is no alias the input name is returned
         /// </summary>
-        public string ExchangeToCommonName(string exchangeName) => !AutoConvertEnabled ? exchangeName : Aliases.SingleOrDefault(x => x.ExchangeAssetName == exchangeName)?.CommonAssetName ?? exchangeName;
+        public string ExchangeToCommonName(string exchangeName)
+        {
+            if (!AutoConvertEnabled)
+                return exchangeName;
+
+            var alias = Aliases.FirstOrDefault(x => x.ExchangeAssetName == exchangeName);
+            if (alias == null || alias.Type == AliasType.OnlyToExchange)
+                return exchangeName;
+
+            return alias.CommonAssetName;
+        }
 
     }
 }