From de969823f5d0300161cce48046656d17eb85e999 Mon Sep 17 00:00:00 2001
From: bettybao1209 <1062108372@qq.com>
Date: Fri, 13 Mar 2020 15:18:48 +0800
Subject: [PATCH 1/2] no deletion for empty value

---
 src/neo/SmartContract/InteropService.Storage.cs | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/src/neo/SmartContract/InteropService.Storage.cs b/src/neo/SmartContract/InteropService.Storage.cs
index 3355a5f83c..7cb7032229 100644
--- a/src/neo/SmartContract/InteropService.Storage.cs
+++ b/src/neo/SmartContract/InteropService.Storage.cs
@@ -4,6 +4,7 @@
 using Neo.VM.Types;
 using System;
 using System.Linq;
+using System.Numerics;
 
 namespace Neo.SmartContract
 {
@@ -43,17 +44,10 @@ private static bool PutExInternal(ApplicationEngine engine, StorageContext conte
 
                 if (engine.Snapshot.Storages.TryGet(skey)?.IsConstant == true) return false;
 
-                if (value.Length == 0 && !flags.HasFlag(StorageFlags.Constant))
-                {
-                    // If put 'value' is empty (and non-const), we remove it (implicit `Storage.Delete`)
-                    engine.Snapshot.Storages.Delete(skey);
-                }
-                else
-                {
-                    StorageItem item = engine.Snapshot.Storages.GetAndChange(skey, () => new StorageItem());
-                    item.Value = value;
-                    item.IsConstant = flags.HasFlag(StorageFlags.Constant);
-                }
+                StorageItem item = engine.Snapshot.Storages.GetAndChange(skey, () => new StorageItem());
+                item.Value = value;
+                item.IsConstant = flags.HasFlag(StorageFlags.Constant);
+
                 return true;
             }
 

From b7e68ff6739899eb1c4e2af8ca9e596f9b5b40d0 Mon Sep 17 00:00:00 2001
From: bettybao1209 <1062108372@qq.com>
Date: Fri, 13 Mar 2020 15:21:33 +0800
Subject: [PATCH 2/2] remove unused namespace

---
 src/neo/SmartContract/InteropService.Storage.cs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/neo/SmartContract/InteropService.Storage.cs b/src/neo/SmartContract/InteropService.Storage.cs
index 7cb7032229..c527ee99f8 100644
--- a/src/neo/SmartContract/InteropService.Storage.cs
+++ b/src/neo/SmartContract/InteropService.Storage.cs
@@ -4,7 +4,6 @@
 using Neo.VM.Types;
 using System;
 using System.Linq;
-using System.Numerics;
 
 namespace Neo.SmartContract
 {