c#测试用户是否有对文件夹的写权限

我需要测试用户是否可以在实际尝试这样做之前写入文件夹。

我已经实现了以下方法(在c# 2.0中)，它尝试使用Directory.GetAccessControl()方法检索文件夹的安全权限。

private bool hasWriteAccessToFolder(string folderPath)
{
    try
    {
        // Attempt to get a list of security permissions from the folder. 
        // This will raise an exception if the path is read only or do not have access to view the permissions. 
        System.Security.AccessControl.DirectorySecurity ds = Directory.GetAccessControl(folderPath);
        return true;
    }
    catch (UnauthorizedAccessException)
    {
        return false;
    }
}

当我在谷歌上搜索如何测试写访问权限时，没有这样的结果，而且在Windows中测试权限看起来非常复杂。我担心我过于简化了事情，这个方法并不健壮，尽管它似乎确实有效。

我测试当前用户是否具有写访问权限的方法是否正确?

当前回答

您的代码获得给定目录的DirectorySecurity，并正确处理异常(由于您无法访问安全性信息)。然而，在您的示例中，您实际上并没有询问返回的对象以查看允许哪些访问—我认为您需要添加这一点。

2009-09-11 10:23:27

其他回答

您可以尝试以下代码块来检查目录是否具有写访问权限。它检查FileSystemAccessRule。

string directoryPath = "C:\\XYZ"; //folderBrowserDialog.SelectedPath;
bool isWriteAccess = false;
try
{
    AuthorizationRuleCollection collection =
        Directory.GetAccessControl(directoryPath)
            .GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount));
    foreach (FileSystemAccessRule rule in collection)
    {
        if (rule.AccessControlType == AccessControlType.Allow)
        {
            isWriteAccess = true;
            break;
        }
    }
}
catch (UnauthorizedAccessException ex)
{
    isWriteAccess = false;
}
catch (Exception ex)
{
    isWriteAccess = false;
}
if (!isWriteAccess)
{
    //handle notifications 
}

2009-11-26 07:35:24

我同意阿什的看法，应该没问题。或者，您也可以使用声明性CAS，如果它们没有访问权限，则实际上从一开始就阻止程序运行。

据我所知，我相信一些CAS特性在c# 4.0中可能不存在，不确定这是否是一个问题。

2009-09-11 10:21:55

试试这个:

try
{
    DirectoryInfo di = new DirectoryInfo(path);
    DirectorySecurity acl = di.GetAccessControl();
    AuthorizationRuleCollection rules = acl.GetAccessRules(true, true, typeof(NTAccount));

    WindowsIdentity currentUser = WindowsIdentity.GetCurrent();
    WindowsPrincipal principal = new WindowsPrincipal(currentUser);
    foreach (AuthorizationRule rule in rules)
    {
        FileSystemAccessRule fsAccessRule = rule as FileSystemAccessRule;
        if (fsAccessRule == null)
            continue;

        if ((fsAccessRule.FileSystemRights & FileSystemRights.WriteData) > 0)
        {
            NTAccount ntAccount = rule.IdentityReference as NTAccount;
            if (ntAccount == null)
            {
                continue;
            }

            if (principal.IsInRole(ntAccount.Value))
            {
                Console.WriteLine("Current user is in role of {0}, has write access", ntAccount.Value);
                continue;
            }
            Console.WriteLine("Current user is not in role of {0}, does not have write access", ntAccount.Value);                        
        }
    }
}
catch (UnauthorizedAccessException)
{
    Console.WriteLine("does not have write access");
}

2012-10-19 13:01:49

http://www.codeproject.com/KB/files/UserFileAccessRights.aspx

非常有用的类，检查以下消息的改进版本。

2009-10-09 10:10:03

我试过大多数方法，但都是假阳性，都是出于同样的原因。仅仅测试目录是否有可用权限是不够的，您必须检查登录用户是否是具有该权限的组的成员。为此，您需要获取用户标识，并检查它是否是包含FileSystemAccessRule IdentityReference的组的成员。我已经测试过了，工作完美无缺..

    /// <summary>
    /// Test a directory for create file access permissions
    /// </summary>
    /// <param name="DirectoryPath">Full path to directory </param>
    /// <param name="AccessRight">File System right tested</param>
    /// <returns>State [bool]</returns>
    public static bool DirectoryHasPermission(string DirectoryPath, FileSystemRights AccessRight)
    {
        if (string.IsNullOrEmpty(DirectoryPath)) return false;

        try
        {
            AuthorizationRuleCollection rules = Directory.GetAccessControl(DirectoryPath).GetAccessRules(true, true, typeof(System.Security.Principal.SecurityIdentifier));
            WindowsIdentity identity = WindowsIdentity.GetCurrent();

            foreach (FileSystemAccessRule rule in rules)
            {
                if (identity.Groups.Contains(rule.IdentityReference))
                {
                    if ((AccessRight & rule.FileSystemRights) == AccessRight)
                    {
                        if (rule.AccessControlType == AccessControlType.Allow)
                            return true;
                    }
                }
            }
        }
        catch { }
        return false;
    }

2014-02-24 18:48:36

c#测试用户是否有对文件夹的写权限

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