C#_设置文件夹访问权限

C# 设置文件夹访问权限

Applying permissions on folders/directories in Windows is one ofthe things developers want to control with their applications. Today we aregoing to look at how can we create such an application in C# which can defineany kind of permission to any user account in Windows environment.

Start Visual Studio and create a new C# Windows application. Nameit DirectoryPermission and Create an interface whichlooks similar to the one below:

1. Change the text of your window to Folder Permission or any other you like.  

2. Drag two labels, two buttons, 1 textbox and 1 combo box on theform. Name the buttons as SelectDirectorybtn andPermissionbtn andleave the names of others as default. 

3. Now we need to add two references, for that right-click yourproject root and select Addreference.

 

4. From the Add Reference Menu, add following two highlightedreferences.

Both of these references actually help us interact with OperatingSystem’s account management and queries.

5. Right click on your Windows Form and Select View Code. 

6. First of all we will define the references that we added inStep 4. We’ll also add System.IO andSystem.Security.AccessControl

   1:  using System.IO;

   2:  using System.Security.AccessControl;

   3:  using System.Management;

   4:  using System.Management.Instrumentation;

 

7. Now we are going to define a method which will fill ourcombobox with names of all user account.

   1:  public void GetUsers()

   2:  {

   3:          // This query will query for all user account names in our current Domain

   4:          SelectQuery sQuery = new SelectQuery("Win32_UserAccount", "Domain='"  + System.Environment.UserDomainName.ToString() + "'");

   5:   

   6:           try

   7:           {

   8:                     // Searching for available Users

   9:                      ManagementObjectSearcher mSearcher = new ManagementObjectSearcher(sQuery);

  10:   

  11:                      foreach (ManagementObject mObject in mSearcher.Get())

  12:                      {

  13:                              // Adding all user names in our combobox

  14:                              comboBox1.Items.Add(mObject["Name"]);

  15:                      }

  16:           }

  17:           catch (Exception ex)

  18:           {

  19:                      MessageBox.Show(ex.ToString());

  20:           }

  21:  }

Note: System.Environment.UserDomainName is going to deliverus our current domain.

 

8. In order to make the above method effective, we need to modifyour form constructor.

   1:  public Form1()

   2:  {

   3:              InitializeComponent();

   4:              GetUsers();

   5:  }

 

9. Now we’ll go back to our design window and double click SelectDirectory button to define its clicking event. Change the definition tofollowing;

   1:  private void SelectDirectorybtn_Click(object sender, EventArgs e)

   2:  {

   3:             // creating a new instance fot FolderBrowsingDialog 

                                    to provide user capability to select target Folder

   4:             FolderBrowserDialog myFolderBrowserDialog = new FolderBrowserDialog();

   5:   

   6:             // showing dialog

   7:             myFolderBrowserDialog.ShowDialog();

   8:   

   9:             // Show the path of selected directory in our text Box 

  10:             textBox1.Text myFolderBrowserDialog.SelectedPath.ToString();

  11:  }

 

10. Move back to your design view and add a Click event to thesecond button i.e. MakeUnreadable, double click it to modify the event.

   1:  private void Permissionbtn_Click(object sender, EventArgs e)

   2:  {

   3:             // retrieving the directory information

   4:             DirectoryInfo myDirectoryInfo = new DirectoryInfo(textBox1.Text);

   5:   

   6:             // Get a DirectorySecurity object that represents the 

   7:             // current security settings.

   8:             DirectorySecurity myDirectorySecurity = myDirectoryInfo.GetAccessControl();

   9:             string User = System.Environment.UserDomainName + "\\" + comboBox1.SelectedItem.ToString(); 

  10:   

  11:             // Add the FileSystemAccessRule to the security settings. 

                 // FileSystemRights is a big list we are current using Read property but you 

                 // can alter any other or many sme of which are:

  12:            // Create Directories: for sub directories Authority

  13:            // Create Files: for files creation access in a particular folder

  14:            // Delete: for deletion athority on folder

  15:            // Delete Subdirectories and files: for authority of deletion over 

                  //subdirectories and files

  16:            // Execute file: For execution accessibility in folder

  17:            // Modify: For folder modification

  18:            // Read: For directory opening

  19:            // Write: to add things in directory

  20:            // Full Control: For administration rights etc etc

  21:   

  22:            // Also AccessControlType which are of two kinds either “Allow” or “Deny”

  23:            myDirectorySecurity.AddAccessRule(new FileSystemAccessRule(User, 

                                              FileSystemRights.Read, AccessControlType.Deny));

  24:   

  25:            // Set the new access settings.

  26:            myDirectoryInfo.SetAccessControl(myDirectorySecurity);

  27:   

  28:           // Showing a Succesfully Done Message

  29:           MessageBox.Show("Permissions Altered Successfully");

  30:  }

That’s it. Compile and execute the application to test results. Ifyou have any queries feel free to ask… Cheers!