fix ResolveConfigPath with Env bug

Author: Ahoo-Wang

build/version.props

@@ -2,7 +2,7 @@
 	<PropertyGroup>
 		<VersionMajor>4</VersionMajor>
 		<VersionMinor>0</VersionMinor>
-		<VersionPatch>80</VersionPatch>
+		<VersionPatch>81</VersionPatch>
 		<VersionPrefix>$(VersionMajor).$(VersionMinor).$(VersionPatch)</VersionPrefix>
 	</PropertyGroup>
 </Project>

src/SmartSql.DIExtension/SmartSqlDIExtensions.cs

@@ -7,6 +7,7 @@
 using SmartSql.Configuration;
 using SmartSql.DbSession;
 using SmartSql.DIExtension;
+using SmartSql.Utils;
 
 namespace Microsoft.Extensions.DependencyInjection
 {
@@ -59,7 +60,7 @@ private static string ResolveConfigPath(IServiceProvider sp)
                 configPath = $"SmartSqlMapConfig.{envStr}.xml";
             }
 
-            if (!File.Exists(configPath))
+            if (!ResourceUtil.FileExists(configPath))
             {
                 configPath = SmartSqlBuilder.DEFAULT_SMARTSQL_CONFIG_PATH;
             }

src/SmartSql/Utils/ResourceUtil.cs

@@ -37,6 +37,16 @@ public static XmlDocument LoadAsXml(ResourceType resourceType, string resourcePa
                     }
             }
         }
+        
+        public static bool FileExists(string filePath)
+        {
+            if (!File.Exists(filePath))
+            {
+                filePath = Path.Combine(BaseDirectory, filePath);
+            }
+
+            return File.Exists(filePath);
+        }
 
         public static XmlDocument LoadFileAsXml(string filePath)
         {