OpenFileDialog.Multiselect Eigenschap

public:
 property bool Multiselect { bool get(); void set(bool value); };

public bool Multiselect { get; set; }

member this.Multiselect : bool with get, set

Public Property Multiselect As Boolean

Waarde van eigenschap

true als in het dialoogvenster meerdere bestanden samen of gelijktijdig kunnen worden geselecteerd; anders, false. De standaardwaarde is false.

Voorbeelden

In het volgende codevoorbeeld kan de gebruiker een aantal afbeeldingen selecteren en weergeven in PictureBox besturingselementen op een formulier. Het toont het initialiseren van een OpenFileDialog, het instellen van de Title en Filter eigenschappen en het toestaan van de gebruiker om meerdere bestanden te selecteren door de Multiselect eigenschap in te stellen op true. In dit codevoorbeeld wordt ervan uitgegaan dat uw formulier al een OpenFileDialog besturingselement met de naam openFileDialog1, een Button benoemde SelectFileButtonen een benoemde FlowLayoutPanelflowLayoutPanel1heeft.

private void Form1_Load(object sender, EventArgs e)
{
    InitializeOpenFileDialog();
}

private void InitializeOpenFileDialog()
{
    // Set the file dialog to filter for graphics files.
    this.openFileDialog1.Filter =
        "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" +
        "All files (*.*)|*.*";

    // Allow the user to select multiple images.
    this.openFileDialog1.Multiselect = true;
    this.openFileDialog1.Title = "My Image Browser";
}

private void selectFilesButton_Click(object sender, EventArgs e)
{
    DialogResult dr = this.openFileDialog1.ShowDialog();
    if (dr == System.Windows.Forms.DialogResult.OK)
    {
        // Read the files
        foreach (String file in openFileDialog1.FileNames) 
        {
            // Create a PictureBox.
            try
            {
                PictureBox pb = new PictureBox();
                Image loadedImage = Image.FromFile(file);
                pb.Height = loadedImage.Height;
                pb.Width = loadedImage.Width;
                pb.Image = loadedImage;
                flowLayoutPanel1.Controls.Add(pb);
            }
            catch (SecurityException ex)
            {
                // The user lacks appropriate permissions to read files, discover paths, etc.
                MessageBox.Show("Security error. Please contact your administrator for details.\n\n" +
                    "Error message: " + ex.Message + "\n\n" +
                    "Details (send to Support):\n\n" + ex.StackTrace
                );
            }
            catch (Exception ex)
            {
                // Could not load the image - probably related to Windows file system permissions.
                MessageBox.Show("Cannot display the image: " + file.Substring(file.LastIndexOf('\\'))
                    + ". You may not have permission to read the file, or " +
                    "it may be corrupt.\n\nReported error: " + ex.Message);
            }
        }
    }

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    InitializeOpenFileDialog()
End Sub

Private Sub SelectFileButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SelectFileButton.Click
    Dim dr As DialogResult = OpenFileDialog1.ShowDialog()
    If (dr = System.Windows.Forms.DialogResult.OK) Then
        ' Read the files
        Dim file As String
        For Each file In OpenFileDialog1.FileNames
            ' Create a PictureBox for each file, and add that file to the FlowLayoutPanel.
            Try
                Dim pb As New PictureBox()
                Dim loadedImage As Image = Image.FromFile(file)
                pb.Height = loadedImage.Height
                pb.Width = loadedImage.Width
                pb.Image = loadedImage
                FlowLayoutPanel1.Controls.Add(pb)
            Catch SecEx As SecurityException
                ' The user lacks appropriate permissions to read files, discover paths, etc.
                MessageBox.Show("Security error. Please contact your administrator for details.\n\n" &
                    "Error message: " & SecEx.Message & "\n\n" &
                    "Details (send to Support):\n\n" & SecEx.StackTrace)
            Catch ex As Exception
                ' Could not load the image - probably permissions-related.
                MessageBox.Show(("Cannot display the image: " & file.Substring(file.LastIndexOf("\"c)) &
                ". You may not have permission to read the file, or " + "it may be corrupt." _
                & ControlChars.Lf & ControlChars.Lf & "Reported error: " & ex.Message))
            End Try
        Next file
    End If
End Sub

Public Sub InitializeOpenFileDialog()
    ' Set the file dialog to filter for graphics files.
    OpenFileDialog1.Filter =
            "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" +
            "All files (*.*)|*.*"

    ' Allow the user to select multiple images.
    OpenFileDialog1.Multiselect = True
    OpenFileDialog1.Title = "My Image Browser"
End Sub

Opmerkingen

Gebruik de FileNames eigenschap voor toegang tot de volledige lijst met geselecteerde bestandsnamen.

Zie ook

• FileNames
• Filter