检查文件/文件夹访问权限

Question

我得到一个UnautorizedAccessException运行此代码:

string[] fileList = Directory.GetFiles(strDir, strExt);

发生在异常c:\users\username\appdata 如何,我可以检查我是否有访问权限(列出和读取文件)？

Answer 1

首先,我会手动检查权限,看看是什么阻止了你,什么不阻止.我使用这样的东西来检查权限(对于复制文件):

AuthorizationRuleCollection acl = fileSecurity.GetAccessRules(true, true,typeof(System.Security.Principal.SecurityIdentifier));
bool denyEdit = false;
for (int x = 0; x < acl.Count; x++)
{
    FileSystemAccessRule currentRule = (FileSystemAccessRule)acl[x];
    AccessControlType accessType = currentRule.AccessControlType;
    //Copy file cannot be executed for "List Folder/Read Data" and "Read extended attributes" denied permission
    if (accessType == AccessControlType.Deny && (currentRule.FileSystemRights & FileSystemRights.ListDirectory) == FileSystemRights.ListDirectory)
    {
        //we have deny copy - we can't copy the file
        denyEdit = true;
        break;
    }
... more checks 
}

此外,还有一些奇怪的情况,文件夹上的某个权限会更改文件的权限,无论其个人权限如何(将查看我是否可以找到它的内容).