> For the complete documentation index, see [llms.txt](https://docs.zongsoft.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zongsoft.com/framework/core/common/randomizer.md).

# 随机器

以 Discussions 的正文文件名说明随机字符串的真实用途。

Randomizer 提供随机字节、整数和字符串。Discussions 使用随机字符串作为文件名的一部分，避免新建内容尚未取得数据库编号时共用同一个文件名。

来源：[src/Services/PostService.cs](https://github.com/Zongsoft/Zongsoft.Discussions/blob/main/src/Services/PostService.cs#L222)（节选；上下文见源文件）。

{% code title="PostService.cs" %}

```csharp
protected virtual string GetContentFilePath(ulong postId, string contentType)
{
	return Utility.GetFilePath(string.Format("posts/post-{0}-{1}.txt", postId.ToString(), Zongsoft.Common.Randomizer.GenerateString()));
}
```

{% endcode %}

PostId 提供业务线索，随机后缀降低同一编号或未分配编号产生路径冲突的机会。路径还会经过 Utility.GetFilePath 加上配置和用户范围。随机文件名不能代替访问控制，也不构成绝对唯一性保证。

## 方法选择

| 方法                                           | 作用            |
| -------------------------------------------- | ------------- |
| Generate                                     | 指定长度的随机字节     |
| GenerateInt16、GenerateInt32、GenerateInt64    | 有符号整数         |
| GenerateUInt16、GenerateUInt32、GenerateUInt64 | 无符号整数         |
| GenerateSecret                               | 密钥风格字符串       |
| GenerateString                               | 普通随机字符串，可限定数字 |

本业务没有直接使用 GenerateSecret 作为凭证，因此不能把文件命名做法直接推广为认证令牌方案。字符串长度和字符范围的框架用例见 [RandomizerTest](https://github.com/Zongsoft/framework/blob/main/Zongsoft.Core/test/Common/RandomizerTest.cs)。

关联阅读：[文件系统](/framework/core/io.md)、[写入操作](/framework/data/writing.md)。


---

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