请教一个简单问题，送分。

Question

在C#中如何知道某一文件夹是否处于共享状态。在不处于的情况下如何设置其共享并分配权限。
谢谢，各位大大了。

Answer 1

using System;
using System.IO;
using System.Security.AccessControl;namespace FileSystemExample
{
    class FileExample
    {
        public static void Main()
        {
            try
            {
                string fileName = "test.xml";                Console.WriteLine("Adding access control entry for " 
                    + fileName);                // Add the access control entry to the file.
                AddFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);                Console.WriteLine("Removing access control entry from " 
                    + fileName);                // Remove the access control entry from the file.
                RemoveFileSecurity(fileName, @"DomainName\AccountName", 
                    FileSystemRights.ReadData, AccessControlType.Allow);                Console.WriteLine("Done.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }        // Adds an ACL entry on the specified file for the specified account.
        public static void AddFileSecurity(string fileName, string account, 
            FileSystemRights rights, AccessControlType controlType)
        {
                        // Get a FileSecurity object that represents the 
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);            // Add the FileSystemAccessRule to the security settings. 
            fSecurity.AddAccessRule(new FileSystemAccessRule(account,
                rights, controlType));            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);        }        // Removes an ACL entry on the specified file for the specified account.
        public static void RemoveFileSecurity(string fileName, string account, 
            FileSystemRights rights, AccessControlType controlType)
        {            // Get a FileSecurity object that represents the 
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);            // Add the FileSystemAccessRule to the security settings. 
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);        }
    }
}