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DirectoryInfo.GetFileSystemInfos Method (String)

Retrieves an array of strongly typed FileSystemInfo objects representing the files and subdirectories that match the specified search criteria.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

public FileSystemInfo[] GetFileSystemInfos(
	string searchPattern
)

Parameters

searchPattern
Type: System.String

The search string to match against the names of directories and files. This parameter can contain a combination of valid literal path and wildcard (* and ?) characters (see Remarks), but doesn't support regular expressions. The default pattern is "*", which returns all files.

Return Value

Type: System.IO.FileSystemInfo[]
An array of strongly typed FileSystemInfo objects matching the search criteria.

ExceptionCondition
ArgumentException

searchPattern contains one or more invalid characters defined by the GetInvalidPathChars method.

ArgumentNullException

searchPattern is null.

DirectoryNotFoundException

The specified path is invalid (for example, it is on an unmapped drive).

SecurityException

The caller does not have the required permission.

searchPattern can be a combination of literal and wildcard characters, but doesn't support regular expressions. The following wildcard specifiers are permitted in searchPattern.

Wildcard specifier

Matches

* (asterisk)

Zero or more characters in that position.

? (question mark)

Zero or one character in that position.

Characters other than the wildcard are literal characters. For example, the string "*t" searches for all names in ending with the letter "t". ". The searchPattern string "s*" searches for all names in path beginning with the letter "s".

This method is not recursive.

For subdirectories, the FileSystemInfo objects returned by this method can be cast to the derived class DirectoryInfo. Use the FileAttributes value returned by the FileSystemInfo.Attributes property to determine whether the FileSystemInfo represents a file or a directory.

Wild cards are permitted. For example, the searchPattern string "*t" searches for all directory names in path ending with the letter "t". The searchPattern string "s*" searches for all directory names in path beginning with the letter "s".

The string ".." can only be used in searchPattern if it is specified as a part of a valid directory name, such as in the directory name "a..b". It cannot be used to move up the directory hierarchy. If there are no files or directories, or no files or directories that match the searchPattern string in the DirectoryInfo, this method returns an empty array.

This method pre-populates the values of the following FileSystemInfo properties:

The following example counts the files and directories that match the specified search pattern.

using System;
using System.IO;

class DirectoryFileCount
{

    static long files = 0;
    static long directories = 0;


    static void Main()
    {
        try
        {
            Console.WriteLine("Enter the path to a directory:");

            string directory = Console.ReadLine();

            Console.WriteLine("Enter a search string (for example *p*):");

            string searchString = Console.ReadLine();

            // Create a new DirectoryInfo object.
            DirectoryInfo dir = new DirectoryInfo(directory);

            if (!dir.Exists)
            {
                throw new DirectoryNotFoundException("The directory does not exist.");
            }

            // Call the GetFileSystemInfos method.
            FileSystemInfo[] infos = dir.GetFileSystemInfos(searchString);

            Console.WriteLine("Working...");

            // Pass the result to the ListDirectoriesAndFiles 
            // method defined below.
            ListDirectoriesAndFiles(infos, searchString);

            // Display the results to the console. 
            Console.WriteLine("Directories: {0}", directories);
            Console.WriteLine("Files: {0}", files);

        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {

            Console.ReadLine();
        }
    }

    static void ListDirectoriesAndFiles(FileSystemInfo[] FSInfo, string SearchString)
    {
        // Check the parameters. 
        if (FSInfo == null)
        {
            throw new ArgumentNullException("FSInfo");
        }
        if (SearchString == null || SearchString.Length == 0)
        {
            throw new ArgumentNullException("SearchString");
        }

        // Iterate through each item. 
        foreach (FileSystemInfo i in FSInfo)
        {
            // Check to see if this is a DirectoryInfo object. 
            if (i is DirectoryInfo)
            {
                // Add one to the directory count.
                directories++;

                // Cast the object to a DirectoryInfo object.
                DirectoryInfo dInfo = (DirectoryInfo)i;

                // Iterate through all sub-directories.
                ListDirectoriesAndFiles(dInfo.GetFileSystemInfos(SearchString), SearchString);
            }
            // Check to see if this is a FileInfo object. 
            else if (i is FileInfo)
            {
                // Add one to the file count.
                files++;

            }

        }
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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