导出数据文件功能，上线一段时间，发现无法导出文件，调试发现文件名称含有产品名称，但是产品名称有非法字符，导致导出文件失败。直接开发个工具类过滤下即可。
直接上代码：
1. 高性能文件名非法字符清理工具
FileNameSanitizer
/// <summary> /// 高性能文件名非法字符清理工具 /// 支持Windows/Linux/Mac平台的非法字符检测和清理 /// </summary> public static class FileNameSanitizer { // Windows系统非法字符 (不包括路径分隔符，因为这里只处理文件名) private static readonly char[] WindowsInvalidChars = new char[] { '"', '<', '>', '|', '*', '?', ':', '\\', '/' }; // 预编译正则表达式用于高性能匹配 private static readonly Regex InvalidCharRegex = new Regex( @"[""<>|*?:""\\/]", RegexOptions.Compiled | RegexOptions.CultureInvariant ); /// <summary> /// 清理文件名中的非法字符 /// </summary> /// <param name="fileName">原始文件名</param> /// <returns>清理后的文件名</returns> public static string SanitizeFileName(string fileName) { if (string.IsNullOrEmpty(fileName)) return fileName; // 使用StringBuilder提高性能 var sb = new StringBuilder(fileName.Length); foreach (char c in fileName) { // 检查是否为非法字符 if (Array.IndexOf(WindowsInvalidChars, c) == -1) { sb.Append(c); } // 跳过非法字符，不添加到结果中 } string sanitized = sb.ToString(); // 确保文件名不为空（如果所有字符都被移除） if (string.IsNullOrEmpty(sanitized)) sanitized = "_"; // 移除首尾空白字符 sanitized = sanitized.Trim(); // 确保文件名不以 . 结尾（这在某些系统上可能导致问题） if (sanitized.EndsWith(".")) sanitized = sanitized.TrimEnd('.'); return sanitized; } /// <summary> /// 使用正则表达式的快速清理方法 /// </summary> /// <param name="fileName">原始文件名</param> /// <returns>清理后的文件名</returns> public static string SanitizeFileNameRegex(string fileName) { if (string.IsNullOrEmpty(fileName)) return fileName; // 使用预编译的正则表达式替换非法字符 string sanitized = InvalidCharRegex.Replace(fileName, ""); // 确保文件名不为空 if (string.IsNullOrEmpty(sanitized)) sanitized = "_"; // 移除首尾空白字符 sanitized = sanitized.Trim(); // 确保文件名不以 . 结尾 if (sanitized.EndsWith(".")) sanitized = sanitized.TrimEnd('.'); return sanitized; } /// <summary> /// 检查文件名是否包含非法字符 /// </summary> /// <param name="fileName">待检查的文件名</param> /// <returns>是否包含非法字符</returns> public static bool ContainsInvalidChars(string fileName) { if (string.IsNullOrEmpty(fileName)) return false; foreach (char c in fileName) { if (Array.IndexOf(WindowsInvalidChars, c) != -1) return true; } return false; } }2.数据导出工具类
DataExporter
/// <summary> /// 数据导出工具类 /// 提供高性能的数据导出和文件名清理功能 /// </summary> public class DataExporter { /// <summary> /// 导出数据到文件，并自动清理文件名中的非法字符 /// </summary> /// <param name="data">要导出的数据</param> /// <param name="fileName">原始文件名</param> /// <param name="directory">目标目录</param> /// <returns>实际保存的完整路径</returns> public static string ExportData(byte[] data, string fileName, string directory = "") { // 清理文件名 string cleanFileName = FileNameSanitizer.SanitizeFileName(fileName); // 构建完整路径 string fullPath = Path.Combine(directory, cleanFileName); // 确保目录存在 string dirPath = Path.GetDirectoryName(fullPath); if (!string.IsNullOrEmpty(dirPath) && !Directory.Exists(dirPath)) { Directory.CreateDirectory(dirPath); } // 写入文件 File.WriteAllBytes(fullPath, data); return fullPath; } /// <summary> /// 导出文本数据到文件 /// </summary> /// <param name="text">要导出的文本</param> /// <param name="fileName">原始文件名</param> /// <param name="encoding">文本编码</param> /// <param name="directory">目标目录</param> /// <returns>实际保存的完整路径</returns> public static string ExportText(string text, string fileName, Encoding encoding = null, string directory = "") { if (encoding == null) encoding = Encoding.UTF8; // 清理文件名 string cleanFileName = FileNameSanitizer.SanitizeFileName(fileName); // 构建完整路径 string fullPath = Path.Combine(directory, cleanFileName); // 确保目录存在 string dirPath = Path.GetDirectoryName(fullPath); if (!string.IsNullOrEmpty(dirPath) && !Directory.Exists(dirPath)) { Directory.CreateDirectory(dirPath); } // 写入文件 File.WriteAllText(fullPath, text, encoding); return fullPath; } }3.测试
static void Main() { // 测试文件名清理 string[] testFileNames = { "test\"file.txt", "data<info>.csv", "report|summary.pdf", "my?document.docx", "file*name.exe", "normal_file.txt", "<>:\"\"\\|?* illegal chars", " spaced file ", ".hidden.", "" }; Console.WriteLine("文件名清理测试:"); foreach (string originalName in testFileNames) { string cleaned = FileNameSanitizer.SanitizeFileName(originalName); bool hasInvalid = FileNameSanitizer.ContainsInvalidChars(originalName); Console.WriteLine($"原文件名: '{originalName}' -> 清理后: '{cleaned}' (含非法字符: {hasInvalid})"); } Console.WriteLine("\n性能对比测试:"); // 性能测试 string testFileName = "performance_test_<>:\"\"|?*.txt"; int iterations = 100000; // 测试逐字符清理方法 var sw = System.Diagnostics.Stopwatch.StartNew(); for (int i = 0; i < iterations; i++) { FileNameSanitizer.SanitizeFileName(testFileName); } sw.Stop(); Console.WriteLine($"逐字符清理方法 ({iterations} 次): {sw.ElapsedMilliseconds} ms"); // 测试正则表达式清理方法 sw.Restart(); for (int i = 0; i < iterations; i++) { FileNameSanitizer.SanitizeFileNameRegex(testFileName); } sw.Stop(); Console.WriteLine($"正则表达式清理方法 ({iterations} 次): {sw.ElapsedMilliseconds} ms"); // 实际导出示例 Console.WriteLine("\n导出示例:"); try { string exportedPath = DataExporter.ExportText( "这是测试数据", "export<data>.csv", Encoding.UTF8, "output" ); Console.WriteLine($"成功导出到: {exportedPath}"); } catch (Exception ex) { Console.WriteLine($"导出失败: {ex.Message}"); } }
