fix(extensions): 修复 NullObject.CompareTo 潜在空引用问题

AlianBlank · AlianBlank · commit 34ca00afc842 · 2026-03-14T14:32:19.000+08:00
- 使用空条件运算符 ?. 避免ToString() 返回 null 时的异常
diff --git a/GameFrameX.Foundation.Extensions/NullObject.cs b/GameFrameX.Foundation.Extensions/NullObject.cs
@@ -72,7 +72,7 @@ public int CompareTo(object value)
                 return comparable.CompareTo(nullObject.Item);
             }
 
-            return string.Compare(Item.ToString(), nullObject.Item.ToString(), StringComparison.Ordinal);
+            return string.Compare(Item?.ToString(), nullObject.Item?.ToString(), StringComparison.Ordinal);
         }
 
         if (value is T directValue)

Original file line number	Diff line number	Diff line change
`@@ -72,7 +72,7 @@ public int CompareTo(object value)`
`72`	`72`	`return comparable.CompareTo(nullObject.Item);`
`73`	`73`	`}`
`74`	`74`
`75`		`- return string.Compare(Item.ToString(), nullObject.Item.ToString(), StringComparison.Ordinal);`
	`75`	`+ return string.Compare(Item?.ToString(), nullObject.Item?.ToString(), StringComparison.Ordinal);`
`76`	`76`	`}`
`77`	`77`
`78`	`78`	`if (value is T directValue)`