在开发中，我们经常会使用IO操作，例如创建，删除文件等操作。在项目中这样的需求也较多，我们也会经常对这些操作进行编码，但是对文件的权限进行设置，这样的操作可能会手动操作，现在介绍一种采用代码动态对文件设置权限的操作。

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   在对文件进行权限设置在DOtNet中，会采用FileSystemAccessRule类进行文件的权限操作。

1.现在看一下FileSystemAccessRule的实现代码：

 public FileSystemAccessRule(
      IdentityReference identity,
      FileSystemRights fileSystemRights,
      AccessControlType type )
      : this(
        identity,
        AccessMaskFromRights( fileSystemRights, type ),
        false,
        InheritanceFlags.None,
        PropagationFlags.None,
        type )
    {
    }

    public FileSystemAccessRule(
      String identity,
      FileSystemRights fileSystemRights,
      AccessControlType type )
      : this(
        new NTAccount(identity),
        AccessMaskFromRights( fileSystemRights, type ),
        false,
        InheritanceFlags.None,
        PropagationFlags.None,
        type )
    {
    }

    //
    // Constructor for creating access rules for folder objects
    //

    public FileSystemAccessRule(
      IdentityReference identity,
      FileSystemRights fileSystemRights,
      InheritanceFlags inheritanceFlags,
      PropagationFlags propagationFlags,
      AccessControlType type )
      : this(
        identity,
        AccessMaskFromRights( fileSystemRights, type ),
        false,
        inheritanceFlags,
        propagationFlags,
        type )
    {
    }

    public FileSystemAccessRule(
      String identity,
      FileSystemRights fileSystemRights,
      InheritanceFlags inheritanceFlags,
      PropagationFlags propagationFlags,
      AccessControlType type )
      : this(
        new NTAccount(identity),
        AccessMaskFromRights( fileSystemRights, type ),
        false,
        inheritanceFlags,
        propagationFlags,
        type )
    {
    }
    internal FileSystemAccessRule(
      IdentityReference identity,
      int accessMask,
      bool isInherited,
      InheritanceFlags inheritanceFlags,
      PropagationFlags propagationFlags,
      AccessControlType type )
      : base(
        identity,
        accessMask,
        isInherited,
        inheritanceFlags,
        propagationFlags,
        type )
    {
    }

    #endregion

    #region Public properties

    public FileSystemRights FileSystemRights
    {
      get { return RightsFromAccessMask( base.AccessMask ); }
    }

 
    internal static int AccessMaskFromRights( FileSystemRights fileSystemRights, AccessControlType controlType )
    {
      if (fileSystemRights < (FileSystemRights) 0 || fileSystemRights > FileSystemRights.FullControl)
        throw new ArgumentOutOfRangeException("fileSystemRights", Environment.GetResourceString("Argument_InvalidEnumValue", fileSystemRights, "FileSystemRights"));
      Contract.EndContractBlock();

      if (controlType == AccessControlType.Allow) {
        fileSystemRights |= FileSystemRights.Synchronize;
      }
      else if (controlType == AccessControlType.Deny) {
        if (fileSystemRights != FileSystemRights.FullControl &&
          fileSystemRights != (FileSystemRights.FullControl & ~FileSystemRights.DeleteSubdirectoriesAndFiles))
          fileSystemRights &= ~FileSystemRights.Synchronize;
      }

      return ( int )fileSystemRights;
    }

    internal static FileSystemRights RightsFromAccessMask( int accessMask )
    {
      return ( FileSystemRights )accessMask;
    }

  }

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