C# 解锁从互联网下载的需要右键属性“解除锁定”的文件

using System; using System.IO; using System.Linq; using System.Runtime.InteropServices; using System.Text;  namespace FileUnlockOnNtfsTool.Common {     /// <summary>     /// NTFS文件系统，文件替代流操作方法类     /// </summary>     internal static class AlternateDataStream     {         public const int _MaxPath = 256;         private const string _LongPathPrefix = @"\?";         public const char _StreamSeparator = ':';          private static readonly char[] InvalidStreamNameChars = Path.GetInvalidFileNameChars().Where(c => c < 1 || c > 31).ToArray();          [DllImport("kernel32.dll", CharSet = CharSet.Auto, BestFitMapping = false, ThrowOnUnmappableChar = true)]         private static extern int FormatMessage(             int dwFlags,             IntPtr lpSource,             int dwMessageId,             int dwLanguageId,             StringBuilder lpBuffer,             int nSize,             IntPtr vaListArguments);          [DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]         private static extern int GetFileAttributes(string fileName);          [DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]         [return: MarshalAs(UnmanagedType.Bool)]         private static extern bool DeleteFile(string name);          /// <summary>         /// 建立流路径         /// </summary>         /// <param name="filePath">文件全名</param>         /// <param name="streamName">流名称</param>         /// <returns></returns>         public static string BuildStreamPath(string filePath, string streamName)         {             if (string.IsNullOrEmpty(filePath))                 return string.Empty;              string result = filePath;             int length = result.Length;             while (0 < length && '\' == result[length - 1])             {                 length--;             }              if (length != result.Length)             {                 result = 0 == length ? "." : result.Substring(0, length);             }              result += _StreamSeparator + streamName + _StreamSeparator + "$DATA";              if (_MaxPath <= result.Length && !result.StartsWith(_LongPathPrefix))             {                 result = _LongPathPrefix + result;             }              return result;         }          /// <summary>         /// 校验是否有效流名称         /// </summary>         /// <param name="streamName"></param>         public static bool ValidateStreamName(string streamName)         {             if (!string.IsNullOrEmpty(streamName) && -1 != streamName.IndexOfAny(InvalidStreamNameChars))                 return false;              return true;         }          public static bool FileExists(string name)         {             return -1 != SafeGetFileAttributes(name);         }          private static int SafeGetFileAttributes(string name)         {             if (string.IsNullOrEmpty(name))                 throw new ArgumentNullException("流路径不能为空");              return GetFileAttributes(name);         }          public static bool SafeDeleteFile(string name)         {             if (string.IsNullOrEmpty(name))                 throw new ArgumentNullException("流路径不能为空");              return DeleteFile(name);         }     } }

using System; using System.IO;  namespace FileUnlockOnNtfsTool.Common {     /// <summary>     /// FileInfo扩展方法     /// </summary>     public static class FileSystem     {         /// <summary>         /// 指定替代流在文件中是否存在         /// </summary>         /// <param name="file"></param>         /// <param name="sStreamName"></param>         /// <returns></returns>         public static bool AlternateDataStreamExists(this FileSystemInfo file, string sStreamName, out string sStreamPath)         {             if (null == file)                 throw new ArgumentNullException("文件不能为空");              if (!AlternateDataStream.ValidateStreamName(sStreamName))                 throw new ArgumentException("流名称存在无效字符");              sStreamPath = AlternateDataStream.BuildStreamPath(file.FullName, sStreamName);             if (string.IsNullOrWhiteSpace(sStreamPath))                 throw new ArgumentException("建立流路径失败，值不能为空");              return AlternateDataStream.FileExists(sStreamPath);         }          /// <summary>         /// 删除指定替代流         /// </summary>         /// <param name="file"></param>         /// <param name="sStreamName"></param>         /// <returns></returns>         public static bool DeleteAlternateDataStream(this FileSystemInfo file, string sStreamName)         {             string sStreamPath = "";             if (!AlternateDataStreamExists(file, sStreamName, out sStreamPath))                 throw new ArgumentException("指定流不存在");              return AlternateDataStream.SafeDeleteFile(sStreamPath);         }     } }

private void btnCheck_Click(object sender, EventArgs e)         {             FileInfo file = new FileInfo(txtFile.Text);             try             {                 if (!file.Exists)                 {                     MessageBox.Show("文件不存在");                     return;                 }                  string sStreamPath = "";                 if (!file.AlternateDataStreamExists(_sZoneId, out sStreamPath))                 {                     MessageBox.Show("文件未锁定");                     return;                 }             }             catch (Exception ex)             {                 MessageBox.Show("文件安全锁验证异常：" + ex.Message);             }              try             {                 if (DialogResult.Yes != MessageBox.Show("文件有安全锁！n是否解除锁定？", "消息", MessageBoxButtons.YesNo, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2))                     return;                  if (file.DeleteAlternateDataStream(_sZoneId))                     MessageBox.Show("解锁成功！");                 else                     MessageBox.Show("解锁失败");             }             catch (Exception ex)             {                 MessageBox.Show("解锁异常：" + ex.Message);             }         }