System.UnauthorizedAccessException的同时创建文件 [英] System.UnauthorizedAccessException while creating a file

问题描述

我试图写一个代码，这样我就可以记录错误消息。我想用命名的日期文件，并希望每一天创建新的日志文件。通过稍微留意一下周围发生后，我带着下面的代码...

I was trying to write a code so that I could log the error messages. I am trying to name the file with the date and would like to create a new log file for each day. After going through a little look around, I came with the following code...

class ErrorLog
{
    public void WriteErrorToFile(string error)
    {
        //http://msdn.microsoft.com/en-us/library/aa326721.aspx refer for more info
        string fileName = DateTime.Now.ToString("dd-MM-yy", DateTimeFormatInfo.InvariantInfo);

        //@ symbol helps to ignore that escape sequence thing
        string filePath = @"c:\users\MyName\mydocuments\visual studio 2012\projects\training\" +
                            @"discussionboard\ErrorLog\" + fileName + ".txt";

        if (File.Exists(filePath))
        {
           // File.SetAttributes(filePath, FileAttributes.Normal);
            File.WriteAllText(filePath, error);
        }
        else
        {
            Directory.CreateDirectory(filePath);
           // File.SetAttributes(filePath, FileAttributes.Normal)
           //Throws unauthorized access exception
            RemoveReadOnlyAccess(filePath);
            File.WriteAllText(filePath, error);
        }
    }

    public static void RemoveReadOnlyAccess(string pathToFile)
    {
        FileInfo myFileInfo = new FileInfo(pathToFile);
        myFileInfo.IsReadOnly = false;
        myFileInfo.Refresh();
    }

    /*Exception thrown:
     * UnAuthorizedAccessException was unhandled.
     * Access to the path 'c:\users\anish\mydocuments\visual studio 2012\
     * projects\training\discussionboard\ErrorLog\04\12\2013.txt' is denied.
     */
}

我发现，大约有一个类似的讨论论坛问题，但使用
File.SetAttrributes（文件路径，FileAttributes.Normal）并没有帮助也没有了RemoveReadOnlyAccess（包括在上面的代码）。当我检查了文件夹的属性，它只读标记，但即使我剔掉这回又来了。我检查了文件夹的权限和除特别许可，这点我是不能够改变，一切都被允许。
任何建议，我应该如何进行将不胜感激。
为什么拒绝访问的路径？的链接讨论了类似的问题，但我不能让我的事与上市有建议的工作。

I found a forum that has discussed about a similar problem but using File.SetAttrributes(filePath, FileAttributes.Normal) did not help neither did the RemoveReadOnlyAccess (included in the code above). When I check the properties of the folder, it has read only marked but even when I tick that off it comes back again. I checked the permissions on the folder and except for the special permission, which I was not able to change, everything is allowed. Any suggestion on how I should proceed would be appreciated. Why is access to the path denied? the link discusses about a similar problem, but I wasn't able to get my thing working with suggestions listed there.

感谢您抽出时间来看看这个。

Thanks for taking time to look at this.

推荐答案

您路径是奇怪的：我的文档目录必须是C：\Users\MyName\Documents\

Your path is strange : "My documents" directory must be "C:\Users\MyName\Documents\"

您可以以使用环境中轻松地纠正：

You can use Environment in order to correct it easily :

String myDocumentPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

请注意，它会查看在我的文档的运行你的EXE用户的文件夹中。

Note that it will acces to "My documents" folder of the user that running your exe.

二错误，CreateDirectory必须在参数的路径，而不是文件。使用像你这样会创建一个子目录的文件名。 ！所以你不能创建这个名称的文件

Second error, CreateDirectory must have a path in argument, not a file. using like you do will create a sub-directory with the file name. So you can't create a file with this name !

试试这个：

String fileName = DateTime.Now.ToString("d", DateTimeFormatInfo.InvariantInfo);

String filePath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
    + @"\visual studio 2012\projects\training\discussionboard\ErrorLog\";
String fileFullName = filePath + fileName + ".txt";

    if (File.Exists(fileFullName ))
    {
        File.WriteAllText(fileFullName , error);
    }
    else
    {
        Directory.CreateDirectory(filePath);

[...]
    }
}

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