编辑“︁C Sharp 文件路径操作”︁（章节）

== 实际应用案例 ==

=== 案例1：日志文件轮转 ===
每天创建带日期后缀的日志文件：

<syntaxhighlight lang="csharp">
string logDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Logs");
string today = DateTime.Now.ToString("yyyyMMdd");
string logFile = Path.Combine(logDir, $"app_{today}.log");

if (!Directory.Exists(logDir))
{
    Directory.CreateDirectory(logDir);
}

File.AppendAllText(logFile, "New log entry...");
</syntaxhighlight>

=== 案例2：安全保存用户上传 ===
防止路径遍历攻击：

<syntaxhighlight lang="csharp">
string userUpload = "../../secret.txt";
string safeUploadDir = @"C:\App\Uploads";

// 获取规范化的绝对路径
string resolvedPath = Path.GetFullPath(Path.Combine(safeUploadDir, userUpload));

// 验证是否仍在允许的目录内
if (!resolvedPath.StartsWith(safeUploadDir, StringComparison.OrdinalIgnoreCase))
{
    throw new SecurityException("非法路径访问尝试！");
}
</syntaxhighlight>