OpenFileDialog Class
Displays a standard dialog box that prompts the user to open a file. This class cannot be inherited.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.CommonDialog
System.Windows.Forms.FileDialog
System.Windows.Forms.OpenFileDialog
| Name | Description | |
|---|---|---|
![]() | OpenFileDialog() | Initializes an instance of the OpenFileDialog class. |
| Name | Description | |
|---|---|---|
![]() | AddExtension | Gets or sets a value indicating whether the dialog box automatically adds an extension to a file name if the user omits the extension.(Inherited from FileDialog.) |
![]() | AutoUpgradeEnabled | Gets or sets a value indicating whether this FileDialog instance should automatically upgrade appearance and behavior when running on Windows Vista.(Inherited from FileDialog.) |
![]() | CheckFileExists | Gets or sets a value indicating whether the dialog box displays a warning if the user specifies a file name that does not exist. (Overrides FileDialog.CheckFileExists.) |
![]() | CheckPathExists | Gets or sets a value indicating whether the dialog box displays a warning if the user specifies a path that does not exist.(Inherited from FileDialog.) |
![]() | Container | Gets the IContainer that contains the Component.(Inherited from Component.) |
![]() | CustomPlaces | Gets the custom places collection for this FileDialog instance.(Inherited from FileDialog.) |
![]() | DefaultExt | Gets or sets the default file name extension.(Inherited from FileDialog.) |
![]() | DereferenceLinks | Gets or sets a value indicating whether the dialog box returns the location of the file referenced by the shortcut or whether it returns the location of the shortcut (.lnk).(Inherited from FileDialog.) |
![]() | FileName | Gets or sets a string containing the file name selected in the file dialog box.(Inherited from FileDialog.) |
![]() | FileNames | Gets the file names of all selected files in the dialog box.(Inherited from FileDialog.) |
![]() | Filter | Gets or sets the current file name filter string, which determines the choices that appear in the "Save as file type" or "Files of type" box in the dialog box.(Inherited from FileDialog.) |
![]() | FilterIndex | Gets or sets the index of the filter currently selected in the file dialog box.(Inherited from FileDialog.) |
![]() | InitialDirectory | Gets or sets the initial directory displayed by the file dialog box.(Inherited from FileDialog.) |
![]() | Multiselect | Gets or sets a value indicating whether the dialog box allows multiple files to be selected. |
![]() | ReadOnlyChecked | Gets or sets a value indicating whether the read-only check box is selected. |
![]() | RestoreDirectory | Gets or sets a value indicating whether the dialog box restores the directory to the previously selected directory before closing.(Inherited from FileDialog.) |
![]() | SafeFileName | Gets the file name and extension for the file selected in the dialog box. The file name does not include the path. |
![]() | SafeFileNames | Gets an array of file names and extensions for all the selected files in the dialog box. The file names do not include the path. |
![]() | ShowHelp | Gets or sets a value indicating whether the Help button is displayed in the file dialog box.(Inherited from FileDialog.) |
![]() | ShowReadOnly | Gets or sets a value indicating whether the dialog box contains a read-only check box. |
![]() | Site | |
![]() | SupportMultiDottedExtensions | Gets or sets whether the dialog box supports displaying and saving files that have multiple file name extensions.(Inherited from FileDialog.) |
![]() | Tag | Gets or sets an object that contains data about the control. (Inherited from CommonDialog.) |
![]() | Title | Gets or sets the file dialog box title.(Inherited from FileDialog.) |
![]() | ValidateNames | Gets or sets a value indicating whether the dialog box accepts only valid Win32 file names.(Inherited from FileDialog.) |
| Name | Description | |
|---|---|---|
![]() | CreateObjRef(Type) | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.(Inherited from MarshalByRefObject.) |
![]() | Dispose() | |
![]() | Equals(Object) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetLifetimeService() | Retrieves the current lifetime service object that controls the lifetime policy for this instance.(Inherited from MarshalByRefObject.) |
![]() | GetType() | |
![]() | InitializeLifetimeService() | Obtains a lifetime service object to control the lifetime policy for this instance.(Inherited from MarshalByRefObject.) |
![]() | OpenFile() | Opens the file selected by the user, with read-only permission. The file is specified by the FileName property. |
![]() | Reset() | Resets all properties to their default values. (Overrides FileDialog.Reset().) |
![]() | ShowDialog() | Runs a common dialog box with a default owner.(Inherited from CommonDialog.) |
![]() | ShowDialog(IWin32Window) | Runs a common dialog box with the specified owner.(Inherited from CommonDialog.) |
![]() | ToString() | This API supports the product infrastructure and is not intended to be used directly from your code. Provides a string version of this object.(Inherited from FileDialog.) |
| Name | Description | |
|---|---|---|
![]() | Disposed | |
![]() | FileOk | Occurs when the user clicks on the Open or Save button on a file dialog box.(Inherited from FileDialog.) |
![]() | HelpRequest | Occurs when the user clicks the Help button on a common dialog box.(Inherited from CommonDialog.) |
This class allows you to check whether a file exists and to open it. The ShowReadOnly property determines whether a read-only check box appears in the dialog box. The ReadOnlyChecked property indicates whether the read-only check box is checked.
Most of the core functionality for this class is found in the FileDialog class.
If you want to give the user the ability to select a folder instead of a file, use FolderBrowserDialog instead.
The following code example creates an OpenFileDialog, sets several properties to define the file extension filter and dialog behavior, and displays the dialog box using the CommonDialog.ShowDialog method. The example requires a form with a Button placed on it and a reference to the System.IO namespace added to it.
private void button1_Click(object sender, System.EventArgs e) { Stream myStream = null; OpenFileDialog openFileDialog1 = new OpenFileDialog(); openFileDialog1.InitialDirectory = "c:\\" ; openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*" ; openFileDialog1.FilterIndex = 2 ; openFileDialog1.RestoreDirectory = true ; if(openFileDialog1.ShowDialog() == DialogResult.OK) { try { if ((myStream = openFileDialog1.OpenFile()) != null) { using (myStream) { // Insert code to read the stream here. } } } catch (Exception ex) { MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message); } } }
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


