以编程方式向 C# 中的文件添加安全权限答案

【问题标题】：Programmatically adding security permissions to files in C#以编程方式向 C# 中的文件添加安全权限
【发布时间】：2010-11-05 09:55:20
【问题描述】：

在一个 asp.net 应用程序中，我有一个任务是将一些 xml 文件传输到我计算机上的本地文件夹中。然后我想读取这些文件，但是当它们被复制到我的本地文件夹时，它们没有设置网络服务用户帐户。所以，我的问题是，在 .Net C# 中，您如何以编程方式将具有完全控制权的“网络服务”帐户添加到我的 xml 文件中。

【问题讨论】：

标签： c# asp.net windows file permissions

【解决方案1】：

见FileSecurity class in MSDN

以下代码示例使用 FileSecurity 类在文件中添加和删除访问控制列表 (ACL) 条目。您必须提供有效的用户或组帐户才能运行此示例。

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.FullControl, AccessControlType.Allow);

                Console.WriteLine("Removing access control entry from "
                    + fileName);

                // Remove the access control entry from the file.
                RemoveFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.FullControl, 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);

            // Remove the FileSystemAccessRule from the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);

        }
    }
}

【讨论】：

【解决方案2】：

如果有帮助，试试这个代码

    public static bool CheckReadWriteAccces(string filePath, System.Security.AccessControl.FileSystemRights fileSystemRights)
    {
        FileInfo fileInfo = new FileInfo(filePath);

        string str = System.Security.Principal.WindowsIdentity.GetCurrent().Name.ToUpper();
        foreach (System.Security.AccessControl.FileSystemAccessRule rule in fileInfo.GetAccessControl().GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)))
        {
            if (str == rule.IdentityReference.Value.ToUpper())
                return ((rule.AccessControlType == System.Security.AccessControl.AccessControlType.Allow) && (fileSystemRights == (rule.FileSystemRights & fileSystemRights)));
        }

        return false;
    }


    /// <summary>
    /// Make a file writteble
    /// </summary>
    /// <param name="path">File name to change</param>
    public static void MakeWritable(string path)
    {
        if (!File.Exists(path))
            return;
        File.SetAttributes(path, File.GetAttributes(path) & ~FileAttributes.ReadOnly);
    }

【讨论】：

【解决方案3】：

答案在于 FileSecurity 类。

http://msdn.microsoft.com/en-us/library/system.security.accesscontrol.filesecurity.aspx

【讨论】：