Článek
11/18/2011

DirectoryInfo Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Exposes instance methods for creating, moving, and enumerating through directories and subdirectories. This class cannot be inherited.

Inheritance Hierarchy

System.Object
System.IO.FileSystemInfo
System.IO.DirectoryInfo

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public NotInheritable Class DirectoryInfo _
    Inherits FileSystemInfo

[ComVisibleAttribute(true)]
public sealed class DirectoryInfo : FileSystemInfo

The DirectoryInfo type exposes the following members.

Constructors

	Name	Description
	DirectoryInfo	When it is called by trusted applications, initializes a new instance of the DirectoryInfo class. .

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Properties

	Name	Description
	Attributes	When called by trusted applications, gets or sets the FileAttributes of the current FileSystemInfo. (Inherited from FileSystemInfo.)
	CreationTime	When called by trusted applications, gets or sets the creation time of the current FileSystemInfo object. (Inherited from FileSystemInfo.)
	Exists	Gets a value indicating whether the directory exists. (Overrides FileSystemInfo.Exists.)
	Extension	Gets the string representing the extension part of the file. (Inherited from FileSystemInfo.)
	FullName	When called by trusted applications, gets the full path of the directory or file. (Inherited from FileSystemInfo.)
	LastAccessTime	When called by trusted applications, gets or sets the time the current file or directory was last accessed. (Inherited from FileSystemInfo.)
	LastWriteTime	When called by trusted applications, gets or sets the time when the current file or directory was last written to. (Inherited from FileSystemInfo.)
	Name	Gets the name of this DirectoryInfo instance. (Overrides FileSystemInfo.Name.)
	Parent	When it is called by trusted applications, gets the parent directory of a specified subdirectory.
	Root	When it is called by trusted applications, gets the root portion of a path.

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Methods

	Name	Description
	Create	When it is called by trusted applications, creates a directory.
	CreateSubdirectory	When it is called by trusted applications, creates a subdirectory or subdirectories on the specified path.
	Delete()	When it is called by trusted applications, deletes this DirectoryInfo if it is empty. (Overrides FileSystemInfo.Delete().)
	Delete(Boolean)	When it is called by trusted applications, deletes this instance of a DirectoryInfo, specifying whether to delete subdirectories and files.
	EnumerateDirectories()	When it is called by trusted applications, returns an enumerable collection of directory information in the current directory.
	EnumerateDirectories(String)	When it is called by trusted applications, returns an enumerable collection of directory information that matches a specified search pattern.
	EnumerateDirectories(String, SearchOption)	When it is called by trusted applications, returns an enumerable collection of directory information that matches a specified search pattern and search subdirectory option.
	EnumerateFiles()	When it is called by trusted applications, returns an enumerable collection of file information in the current directory.
	EnumerateFiles(String)	When it is called by trusted applications, returns an enumerable collection of file information that matches a search pattern.
	EnumerateFiles(String, SearchOption)	When it is called by trusted applications, returns an enumerable collection of file information that matches a specified search pattern and search subdirectory option.
	EnumerateFileSystemInfos()	When it is called by trusted applications, returns an enumerable collection of file system information in the current directory.
	EnumerateFileSystemInfos(String)	When it is called by trusted applications, returns an enumerable collection of file system information that matches a specified search pattern.
	EnumerateFileSystemInfos(String, SearchOption)	When it is called by trusted applications, returns an enumerable collection of file system information that matches a specified search pattern and search subdirectory option.
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetDirectories()	Security Critical. Returns the subdirectories of the current directory.
	GetDirectories(String)	Security Critical. Returns an array of directories in the current DirectoryInfo matching the given search criteria.
	GetFiles()	Security Critical. Returns a file list from the current directory.
	GetFiles(String)	Security Critical. Returns a file list from the current directory matching the given searchPattern.
	GetFileSystemInfos()	Security Critical. Returns an array of strongly typed FileSystemInfo entries representing all the files and subdirectories in a directory.
	GetFileSystemInfos(String)	Security Critical. Retrieves an array of strongly typed FileSystemInfo objects representing the files and subdirectories matching the specified search criteria.
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	MoveTo	When it is called by trusted applications, moves a DirectoryInfo instance and its contents to a new path.
	Refresh	Refreshes the state of the object. (Inherited from FileSystemInfo.)
	ToString	Returns the original path that was passed by the user. (Overrides Object.ToString().)

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Fields

	Name	Description
	FullPath	Infrastructure. Represents the fully qualified path of the directory or file. (Inherited from FileSystemInfo.)
	OriginalPath	Infrastructure. The path originally specified by the user, whether relative or absolute. (Inherited from FileSystemInfo.)

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Remarks

Platform Notes

Silverlight for Windows Phone

This type is present to support the .NET Compact Framework infrastructure in Silverlight for Windows Phone, and it is not intended to be used in your application code.

Examples

The following example displays an image picked at random from the user's My Pictures folder. It uses the DirectoryInfo class to obtain an enumerable collection of FileInfo objects that represent files that have a .jpg or .png extension. That collection is used to construct a List<T> collection so that its index can be used to select a file that corresponds to the random number.

The example then creates a bitmap image by using the FileStream class and sets it as the source for an Image control (named MyImage).

For example code and information about how to create an application that runs outside the browser, see Out-of-Browser Support.

Private Sub LoadImage()

    If Application.Current.HasElevatedPermissions Then
        Dim di As New DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures))

        Dim files = From f In di.EnumerateFiles() _
            Where f.Extension.ToLower() = ".jpg" OrElse f.Extension = ".png" _
            Select f

        Dim max As Integer = files.Count() + 1

        Dim rnd As New Random()
        Dim r As Integer = rnd.[Next](0, max)

        Dim pics As New List(Of FileInfo)(files)

        Dim randpic As String = pics(r).FullName

        Dim img As New BitmapImage()
        img.SetSource(New FileStream(randpic, FileMode.Open))


        MyImage.Source = img
    End If
End Sub

private void LoadImage()
{

    if (Application.Current.HasElevatedPermissions)
    {
        DirectoryInfo di = new DirectoryInfo(Environment.GetFolderPath(
           Environment.SpecialFolder.MyPictures));

        var files = from f in di.EnumerateFiles()
                    where f.Extension.ToLower() == ".jpg" || 
                        f.Extension == ".png"
                    select f;

        int max = files.Count() + 1;

        Random rnd = new Random();
        int r = rnd.Next(0, max);

        List<FileInfo> pics = new List<FileInfo>(files);

        string randpic = pics[r].FullName;

        BitmapImage img = new BitmapImage();
        img.SetSource(new FileStream(randpic, FileMode.Open));

        MyImage.Source = img;

    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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