Directory.GetLogicalDrives Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Recupera i nomi delle unità logiche in questo computer.
public:
static cli::array <System::String ^> ^ GetLogicalDrives();public static string[] GetLogicalDrives();static member GetLogicalDrives : unit -> string[]Public Shared Function GetLogicalDrives () As String()Valori restituiti
String[]
Matrice di stringhe che rappresentano i nomi delle unità logiche.
Eccezioni
Si è verificato un errore di I/O, ad esempio un errore del disco.
Il chiamante non dispone dell'autorizzazione richiesta.
Esempio
Nell'esempio seguente viene utilizzato il GetLogicalDrives metodo per assegnare il nome di ogni unità nel computer chiamante a una matrice di stringhe. Ogni membro di questa matrice di stringhe viene quindi stampato nella console. L'esempio è configurato per rilevare tutti gli errori comuni a questo metodo.
using System;
namespace GetFileSystemEntries
{
class Class1
{
static void Main(string[] args)
{
Class1 snippets = new Class1();
string path = System.IO.Directory.GetCurrentDirectory();
string filter = "*.exe";
snippets.PrintFileSystemEntries(path);
snippets.PrintFileSystemEntries(path, filter);
snippets.GetLogicalDrives();
snippets.GetParent(path);
snippets.Move("C:\\proof", "C:\\Temp");
}
void PrintFileSystemEntries(string path)
{
try
{
// Obtain the file system entries in the directory path.
string[] directoryEntries =
System.IO.Directory.GetFileSystemEntries(path);
foreach (string str in directoryEntries)
{
System.Console.WriteLine(str);
}
}
catch (ArgumentNullException)
{
System.Console.WriteLine("Path is a null reference.");
}
catch (System.Security.SecurityException)
{
System.Console.WriteLine("The caller does not have the " +
"required permission.");
}
catch (ArgumentException)
{
System.Console.WriteLine("Path is an empty string, " +
"contains only white spaces, " +
"or contains invalid characters.");
}
catch (System.IO.DirectoryNotFoundException)
{
System.Console.WriteLine("The path encapsulated in the " +
"Directory object does not exist.");
}
}
void PrintFileSystemEntries(string path, string pattern)
{
try
{
// Obtain the file system entries in the directory
// path that match the pattern.
string[] directoryEntries =
System.IO.Directory.GetFileSystemEntries(path, pattern);
foreach (string str in directoryEntries)
{
System.Console.WriteLine(str);
}
}
catch (ArgumentNullException)
{
System.Console.WriteLine("Path is a null reference.");
}
catch (System.Security.SecurityException)
{
System.Console.WriteLine("The caller does not have the " +
"required permission.");
}
catch (ArgumentException)
{
System.Console.WriteLine("Path is an empty string, " +
"contains only white spaces, " +
"or contains invalid characters.");
}
catch (System.IO.DirectoryNotFoundException)
{
System.Console.WriteLine("The path encapsulated in the " +
"Directory object does not exist.");
}
}
// Print out all logical drives on the system.
void GetLogicalDrives()
{
try
{
string[] drives = System.IO.Directory.GetLogicalDrives();
foreach (string str in drives)
{
System.Console.WriteLine(str);
}
}
catch (System.IO.IOException)
{
System.Console.WriteLine("An I/O error occurs.");
}
catch (System.Security.SecurityException)
{
System.Console.WriteLine("The caller does not have the " +
"required permission.");
}
}
void GetParent(string path)
{
try
{
System.IO.DirectoryInfo directoryInfo =
System.IO.Directory.GetParent(path);
System.Console.WriteLine(directoryInfo.FullName);
}
catch (ArgumentNullException)
{
System.Console.WriteLine("Path is a null reference.");
}
catch (ArgumentException)
{
System.Console.WriteLine("Path is an empty string, " +
"contains only white spaces, or " +
"contains invalid characters.");
}
}
void Move(string sourcePath, string destinationPath)
{
try
{
System.IO.Directory.Move(sourcePath, destinationPath);
System.Console.WriteLine("The directory move is complete.");
}
catch (ArgumentNullException)
{
System.Console.WriteLine("Path is a null reference.");
}
catch (System.Security.SecurityException)
{
System.Console.WriteLine("The caller does not have the " +
"required permission.");
}
catch (ArgumentException)
{
System.Console.WriteLine("Path is an empty string, " +
"contains only white spaces, " +
"or contains invalid characters.");
}
catch (System.IO.IOException)
{
System.Console.WriteLine("An attempt was made to move a " +
"directory to a different " +
"volume, or destDirName " +
"already exists.");
}
}
}
}
open System
open System.IO
open System.Security
let printFileSystemEntries path =
try
// Obtain the file system entries in the directory path.
let directoryEntries = Directory.GetFileSystemEntries path
for str in directoryEntries do
printfn $"{str}"
with
| :? ArgumentNullException ->
printfn "Path is a null reference."
| :? SecurityException ->
printfn $"The caller does not have the required permission."
| :? ArgumentException ->
printfn $"Path is an empty string, contains only white spaces, or contains invalid characters."
| :? DirectoryNotFoundException ->
printfn $"The path encapsulated in the Directory object does not exist."
let printFileSystemEntriesPattern path pattern =
try
// Obtain the file system entries in the directory
// path that match the pattern.
let directoryEntries = Directory.GetFileSystemEntries(path, pattern)
for str in directoryEntries do
printfn $"{str}"
with
| :? ArgumentNullException -> printfn "Path is a null reference."
| :? SecurityException -> printfn "The caller does not have the required permission."
| :? ArgumentException -> printfn "Path is an empty string, contains only white spaces, or contains invalid characters."
| :? DirectoryNotFoundException -> printfn "The path encapsulated in the Directory object does not exist."
// Print out all logical drives on the system.
let getLogicalDrives () =
try
let drives = Directory.GetLogicalDrives()
for str in drives do
printfn $"{str}"
with
| :? IOException -> printfn "An I/O error occurs."
| :? SecurityException -> printfn "The caller does not have the required permission."
let getParent path =
try
let directoryInfo = Directory.GetParent path
printfn $"{directoryInfo.FullName}"
with
| :? ArgumentNullException -> printfn "Path is a null reference."
| :? ArgumentException -> printfn "Path is an empty string, contains only white spaces, or contains invalid characters."
let move sourcePath destinationPath =
try
Directory.Move(sourcePath, destinationPath)
printfn "The directory move is complete."
with
| :? ArgumentNullException -> printfn "Path is a null reference."
| :? SecurityException -> printfn "The caller does not have the required permission."
| :? ArgumentException -> printfn "Path is an empty string, contains only white spaces, or contains invalid characters."
| :? IOException -> printfn "An attempt was made to move a directory to a different volume, or destDirName already exists."
let path = Directory.GetCurrentDirectory()
let filter = "*.exe"
printFileSystemEntries path
printFileSystemEntriesPattern path filter
getLogicalDrives ()
getParent path
move "C:\\proof" "C:\\Temp"
Option Explicit On
Option Strict On
Namespace GetFileSystemEntries
Class Class1
Overloads Shared Sub Main(ByVal args() As String)
Dim snippets As New Class1()
Dim path As String = System.IO.Directory.GetCurrentDirectory()
Dim filter As String = "*.exe"
snippets.PrintFileSystemEntries(path)
snippets.PrintFileSystemEntries(path, filter)
snippets.GetLogicalDrives()
snippets.GetParent(path)
snippets.Move("C:\proof", "C:\Temp")
End Sub
Sub PrintFileSystemEntries(ByVal path As String)
Try
' Obtain the file system entries in the directory path.
Dim directoryEntries As String()
directoryEntries = System.IO.Directory.GetFileSystemEntries(path)
Dim str As String
For Each str In directoryEntries
System.Console.WriteLine(str)
Next str
Catch exp As ArgumentNullException
System.Console.WriteLine("Path is a null reference.")
Catch exp As System.Security.SecurityException
System.Console.WriteLine("The caller does not have the " + _
"required permission.")
Catch exp As ArgumentException
System.Console.WriteLine("Path is an empty string, " + _
"contains only white spaces, " + _
"or contains invalid characters.")
Catch exp As System.IO.DirectoryNotFoundException
System.Console.WriteLine("The path encapsulated in the " + _
"Directory object does not exist.")
End Try
End Sub
Sub PrintFileSystemEntries(ByVal path As String, _
ByVal pattern As String)
Try
' Obtain the file system entries in the directory
' path that match the pattern.
Dim directoryEntries As String()
directoryEntries = _
System.IO.Directory.GetFileSystemEntries(path, pattern)
Dim str As String
For Each str In directoryEntries
System.Console.WriteLine(str)
Next str
Catch exp As ArgumentNullException
System.Console.WriteLine("Path is a null reference.")
Catch exp As System.Security.SecurityException
System.Console.WriteLine("The caller does not have the " + _
"required permission.")
Catch exp As ArgumentException
System.Console.WriteLine("Path is an empty string, " + _
"contains only white spaces, " + _
"or contains invalid characters.")
Catch exp As System.IO.DirectoryNotFoundException
System.Console.WriteLine("The path encapsulated in the " + _
"Directory object does not exist.")
End Try
End Sub
' Print out all logical drives on the system.
Sub GetLogicalDrives()
Try
Dim drives As String()
drives = System.IO.Directory.GetLogicalDrives()
Dim str As String
For Each str In drives
System.Console.WriteLine(str)
Next str
Catch exp As System.IO.IOException
System.Console.WriteLine("An I/O error occurs.")
Catch exp As System.Security.SecurityException
System.Console.WriteLine("The caller does not have the " + _
"required permission.")
End Try
End Sub
Sub GetParent(ByVal path As String)
Try
Dim directoryInfo As System.IO.DirectoryInfo
directoryInfo = System.IO.Directory.GetParent(path)
System.Console.WriteLine(directoryInfo.FullName)
Catch exp As ArgumentNullException
System.Console.WriteLine("Path is a null reference.")
Catch exp As ArgumentException
System.Console.WriteLine("Path is an empty string, " + _
"contains only white spaces, or " + _
"contains invalid characters.")
End Try
End Sub
Sub Move(ByVal sourcePath As String, ByVal destinationPath As String)
Try
System.IO.Directory.Move(sourcePath, destinationPath)
System.Console.WriteLine("The directory move is complete.")
Catch exp As ArgumentNullException
System.Console.WriteLine("Path is a null reference.")
Catch exp As System.Security.SecurityException
System.Console.WriteLine("The caller does not have the " + _
"required permission.")
Catch exp As ArgumentException
System.Console.WriteLine("Path is an empty string, " + _
"contains only white spaces, " + _
"or contains invalid characters.")
Catch exp As System.IO.IOException
System.Console.WriteLine("An attempt was made to move a " + _
"directory to a different " + _
"volume, or destDirName " + _
"already exists.")
End Try
End Sub
End Class
End Namespace
Commenti
In Windows, GetLogicalDrives restituisce i nomi di tutte le unità accessibili in un determinato computer, incluse le unità o i dispositivi multimediali rimovibili, sotto forma di lettera "<drive>:\" (ad esempio, "C:\"). In Unix restituisce i percorsi di tutti i punti di montaggio del file system montati in un determinato computer (ad esempio, "/home/user", "/media/usb").
Per un elenco delle attività di I/O comuni, vedere Attività di I/O comuni.
