Update guid

Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.1.4.203-preview08</version>
+    <version>5.1.4.203-preview15</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>

Src/Asp.NetCore2/SqlSugar/Utilities/UtilMethods.cs

@@ -2018,10 +2018,18 @@ namespace SqlSugar
 
         public static object NewGuid()
         {
-            if (StaticConfig.CustomGuidByValueFunc == null)
-                return Guid.NewGuid();
-            else
+            if (StaticConfig.CustomGuidFunc != null)
+            {
+                return StaticConfig.CustomGuidFunc();
+            }
+            else if (StaticConfig.CustomGuidByValueFunc != null)
+            {
                 return StaticConfig.CustomGuidByValueFunc(Guid.NewGuid());
+            }
+            else
+            {
+                return Guid.NewGuid();
+            }
         }
     }
 }