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?
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;
}
我也遇到了同样的问题:如何验证我是否可以在特定目录中读/写。我最终得到了一个简单的解决办法……实际测试一下。
以下是我简单而有效的解决方法。
class Program
{
/// <summary>
/// Tests if can read files and if any are present
/// </summary>
/// <param name="dirPath"></param>
/// <returns></returns>
private genericResponse check_canRead(string dirPath)
{
try
{
IEnumerable<string> files = Directory.EnumerateFiles(dirPath);
if (files.Count().Equals(0))
return new genericResponse() { status = true, idMsg = genericResponseType.NothingToRead };
return new genericResponse() { status = true, idMsg = genericResponseType.OK };
}
catch (DirectoryNotFoundException ex)
{
return new genericResponse() { status = false, idMsg = genericResponseType.ItemNotFound };
}
catch (UnauthorizedAccessException ex)
{
return new genericResponse() { status = false, idMsg = genericResponseType.CannotRead };
}
}
/// <summary>
/// Tests if can wirte both files or Directory
/// </summary>
/// <param name="dirPath"></param>
/// <returns></returns>
private genericResponse check_canWrite(string dirPath)
{
try
{
string testDir = "__TESTDIR__";
Directory.CreateDirectory(string.Join("/", dirPath, testDir));
Directory.Delete(string.Join("/", dirPath, testDir));
string testFile = "__TESTFILE__.txt";
try
{
TextWriter tw = new StreamWriter(string.Join("/", dirPath, testFile), false);
tw.WriteLine(testFile);
tw.Close();
File.Delete(string.Join("/", dirPath, testFile));
return new genericResponse() { status = true, idMsg = genericResponseType.OK };
}
catch (UnauthorizedAccessException ex)
{
return new genericResponse() { status = false, idMsg = genericResponseType.CannotWriteFile };
}
}
catch (UnauthorizedAccessException ex)
{
return new genericResponse() { status = false, idMsg = genericResponseType.CannotWriteDir };
}
}
}
public class genericResponse
{
public bool status { get; set; }
public genericResponseType idMsg { get; set; }
public string msg { get; set; }
}
public enum genericResponseType
{
NothingToRead = 1,
OK = 0,
CannotRead = -1,
CannotWriteDir = -2,
CannotWriteFile = -3,
ItemNotFound = -4
}
希望能有所帮助!
