Question

我正在尝试模拟错误但我无法完成此操作。我的源代码应该查看每个驱动器，并找到一个文件夹或文件与您作为参数传入。然后它在日志文件（.log）中将它找到的内容写入驱动器（％SystemDrive％）。代码在我的本地计算机上运行，但是当其他人尝试运行它时，它们会收到UnauthorizedAccessException：访问路径＆c; \：ARAGORN.log＆＃39;被拒绝。由于一些奇怪的原因，该人无法将结果写入该日志文件，我不明白为什么。有人可以看看是否可以模拟此异常。请从命令行或powershell运行它。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Management;
using System.Security.Permissions;
using System.Collections;

/***
 *                                                                                          
 *  Written by:                                                                                          
 *                                                                                          
 *  Description: Look through every single drive to find files with the name <the file that you are look of> (Specify name in the string theString).
 *               All files are then stored in an ArrayList called fileList.
 *  
 *  Notes: If a file does note have the exact name, it will be ignored.
 *         This only finds files with the name you are looking for. Directories will be ignored.
 *                                                                                          
 * 
 * */
namespace FileFinder
{
    class Program
    {
        static ArrayList fileList = new ArrayList();
        static ArrayList folderList = new ArrayList();

        static void Main(string[] args)
        {
            //Console.WriteLine("There are this many args: " + args.Length);
            if(args.Length < 1)
            {
                Console.WriteLine("Too few arguments");
                System.Environment.Exit(1);
            }
            else if(args.Length > 1)
            {
                Console.WriteLine("Too many arguments");
                System.Environment.Exit(1);
            }
            //change the name you search for a specific file name
            //Console.WriteLine("Enter the file name");
            string hostName = System.Net.Dns.GetHostName();
            string theString = args[0];
            foreach (DriveInfo d in DriveInfo.GetDrives())
            {
                string drive = d.Name;
                try
                {
                    Console.WriteLine("Looking in " + drive + " for " + theString);
                    LookForFileInDir(drive, theString);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                }


            }
            //Console.WriteLine("The Host Name is: " + hostName);
            Console.WriteLine("There are " + fileList.Count + " files that were found with the name " + theString);
            Console.WriteLine("There are " + folderList.Count + " folders that were found with the name " + theString);



            var actualPath = Environment.ExpandEnvironmentVariables(@"%SystemDrive%\"+hostName+".log");
            using (System.IO.StreamWriter file = new System.IO.StreamWriter(actualPath ))
            {
                file.WriteLine("bytes\t" + "file");
                foreach (string f in fileList)
                {
                    file.WriteLine(f);
                }
                file.WriteLine();
                file.WriteLine("\t" + "folder");
                foreach (string folder in folderList)
                {
                    file.WriteLine(folder);
                }
            }
            Console.WriteLine("Press enter to close...");
            Console.ReadLine();
        }

        /**
         * 
         * Looks for files in directories
         * 
         * */
        static void LookForFileInDir(string folder, string theString)
        {
            string output = "";
            //Console.WriteLine("I am not losing my mind");
            foreach (string file in Directory.GetFiles(folder, "*" + theString + "*.*"))
            {
                //Console.WriteLine("I am not losing my mind");
                if (!IsLink(file))
                {
                    FileInfo info = new FileInfo(file);
                    Console.WriteLine(info.Length + "\t" + file);
                    fileList.Add(info.Length + "\t" + file);
                    output += file;
                }
            }

            foreach (string subDir in Directory.GetDirectories(folder, theString))
            {
                try
                {
                    Console.WriteLine("\t" + subDir);
                    folderList.Add("\t" + subDir);
                }
                //Ignores all shortcuts in a drive
                catch (UnauthorizedAccessException e)
                {

                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                    output += e.Message;
                }
            }


            foreach (string subDir in Directory.GetDirectories(folder))
            {
                try
                {
                    LookForFileInDir(subDir, theString);

                }
                //Ignores all shortcuts in a drive
                catch (UnauthorizedAccessException e)
                {

                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                    output += e.Message;
                }
            }

        }
        /// <summary>
        /// Returns whether the given path/file is a link
        /// </summary>
        /// <param name="shortcutFilename"></param>
        /// <returns></returns>
        public static bool IsLink(string shortcutFilename)
        {
            string pathOnly = System.IO.Path.GetDirectoryName(shortcutFilename);
            string filenameOnly = System.IO.Path.GetFileName(shortcutFilename);

            Shell32.Shell shell = new Shell32.Shell();
            Shell32.Folder folder = shell.NameSpace(pathOnly);
            Shell32.FolderItem folderItem = folder.ParseName(filenameOnly);
            if (folderItem != null)
            {
                return folderItem.IsLink;
            }
            return false; // not found
        }

    }
}

Answer 1

默认情况下，命令提示符不会以管理员权限运行。在Windows Vista或更高版本上，C驱动器被锁定而无需管理员权限（或者不禁用UAC和某些安全性）。

我建议您更改日志文件的位置。桌面将是一个好地方，您可以使用特殊文件夹将其放置给任何用户。

Environment.GetFolderPath(Environment.SpecialFolder.Desktop)

其他文件夹选项为available from MSDN，如果您的经理需要系统文件夹但最终用户无法使用提升的权限，则可能需要提供一些回复。如果可以，请确保他们以管理员身份运行。

我们还可以告诉异常是文件夹访问权限，因为：

不是扩大环境变量。如果此失败，则会抛出ArgumentNullException。
UAC的例外情况。 MSDN涵盖了此例外的原因：

UnauthorizedAccessException异常通常由一个方法抛出包装Windows API调用。要找到异常的原因，检查异常对象的Message属性的文本。 UnauthorizedAccessException使用HRESULT COR_E_UNAUTHORIZEDACCESS，其值为0x80070005。

Answer 2

要模拟异常，只需拒绝调试用户对C：\

的写入权限

Answer 3

实际上root C：不是转储文件的好地方 - 标准的Windows访问限制是有道理的。在你的位置，我会考虑移动日志文件我。即到Temp文件夹（如我的第一条评论中所述）。这应该可以解决问题。

但是如果你坚持保持文件不变，我会确保用管理员权限执行程序。这也应该解决问题。

需要帮助在C＃中模拟异常吗？

3 个答案: