From 5cc7438bc94f62197108a3f3e5405a747bbc8884 Mon Sep 17 00:00:00 2001
From: AlexGreatDev <AlexanderGreatDev@gmail.com>
Date: Tue, 13 May 2025 19:24:58 +0330
Subject: [PATCH] fix: handle nullable decimal by returning 0m if null (closes
 #1573)

---
 Dapper/SqlMapper.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Dapper/SqlMapper.cs b/Dapper/SqlMapper.cs
index d23e949a5..d8ac0fa01 100644
--- a/Dapper/SqlMapper.cs
+++ b/Dapper/SqlMapper.cs
@@ -1973,6 +1973,11 @@ private static Func<DbDataReader, object> GetDeserializer(Type type, DbDataReade
                 }
                 return GetTypeDeserializer(type, reader, startBound, length, returnNullIfFirstMissing);
             }
+            //  Patch for nullable decimal issue
+            if (type == typeof(decimal?))
+            {
+                return r => r.IsDBNull(startBound) ? (object)0m : r.GetDecimal(startBound);
+            }
             return GetSimpleValueDeserializer(type, underlyingType ?? type, startBound, useGetFieldValue);
         }