119 lines
3.9 KiB
C#
119 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace SWS.CAD.Helper
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{
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public static class FileHelper
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{
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/// <summary>
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/// dwg等文件名是否合法。不带后缀
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/// </summary>
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/// <param name="fileName"></param>
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/// <returns></returns>
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public static bool IsValidFileName(string fileName)
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{
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if (string.IsNullOrEmpty(fileName))
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{
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return false;
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}
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// 获取 Windows 文件系统中不允许出现在文件名中的字符数组
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char[] invalidChars = Path.GetInvalidFileNameChars();
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// 检查文件名中是否包含非法字符
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foreach (char c in invalidChars)
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{
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if (fileName.IndexOf(c) >= 0)
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{
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return false;
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}
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}
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// 检查是否为保留文件名
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string[] reservedNames = { "CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9" };
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string trimmedFileName = Path.GetFileNameWithoutExtension(fileName).Trim().ToUpper();
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foreach (string reservedName in reservedNames)
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{
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if (trimmedFileName == reservedName)
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{
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return false;
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}
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}
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// 检查文件名是否以空格或句点结尾
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if (fileName.TrimEnd().Length != fileName.Length || fileName.TrimEnd('.').Length != fileName.Length)
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{
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return false;
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}
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return true;
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}
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public static string GetFileMD5(string filePath)
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{
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if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
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{
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throw new ArgumentException("文件路径无效或文件不存在", nameof(filePath));
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}
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using (var md5 = MD5.Create()) // 创建 MD5 哈希算法实例
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using (var stream = File.OpenRead(filePath)) // 打开文件流
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{
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// 计算文件的 MD5 值
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byte[] hashBytes = md5.ComputeHash(stream);
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// 将字节数组转换为十六进制字符串
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StringBuilder sb = new StringBuilder();
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foreach (var b in hashBytes)
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{
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sb.Append(b.ToString("x2")); // x2 格式化为两位小写十六进制数
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}
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return sb.ToString(); // 返回 MD5 值的字符串
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}
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}
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#region 检查文件是否被其他进程占用
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/// <summary>
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/// 检查文件是否被其他进程占用
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/// </summary>
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public static bool IsFileLocked(string filePath)
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{
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try
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{
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// 尝试以独占模式打开文件
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using (FileStream fs = File.Open(
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filePath,
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FileMode.Open,
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FileAccess.ReadWrite,
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FileShare.None)) // FileShare.None 表示禁止共享
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{
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return false; // 成功打开则未被占用
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}
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}
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catch (IOException ex)
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{
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// 检查特定错误码
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int errorCode = Marshal.GetHRForException(ex) & 0xFFFF;
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return errorCode == 32 || errorCode == 33; // 32: 共享冲突, 33: 进程锁定
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}
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catch (UnauthorizedAccessException)
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{
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return true; // 无权限访问（可能被占用）
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}
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catch
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{
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return false; // 其他异常视为未被占用
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}
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}
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#endregion
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}
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}
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