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。
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;
}
}
