FileOpenPicker Klasse

Definition

public ref class FileOpenPicker sealed

/// [Windows.Foundation.Metadata.Activatable(65536, Windows.Foundation.UniversalApiContract)]
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
class FileOpenPicker final

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
class FileOpenPicker final

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class FileOpenPicker final

[Windows.Foundation.Metadata.Activatable(65536, typeof(Windows.Foundation.UniversalApiContract))]
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public sealed class FileOpenPicker

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
public sealed class FileOpenPicker

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class FileOpenPicker

function FileOpenPicker()

Public NotInheritable Class FileOpenPicker

Vererbung

Object Platform::Object IInspectable FileOpenPicker

Attribute

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows-Anforderungen

Beispiele

Das Beispiel für die Dateiauswahl zeigt, wie Sie überprüfen, ob die App angeknipst ist, wie Sie Dateiauswahleigenschaften festlegen und eine Dateiauswahl anzeigen, damit der Benutzer eine Datei auswählen kann.

FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");

StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
    // Application now has read/write access to the picked file
    OutputTextBlock.Text = "Picked photo: " + file.Name;
}
else
{
    OutputTextBlock.Text = "Operation cancelled.";
}

// Create the picker object and set options
var openPicker = new Windows.Storage.Pickers.FileOpenPicker();
openPicker.viewMode = Windows.Storage.Pickers.PickerViewMode.thumbnail;
openPicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.picturesLibrary;
// Users expect to have a filtered view of their folders depending on the scenario.
// For example, when choosing a documents folder, restrict the filetypes to documents for your application.
openPicker.fileTypeFilter.replaceAll([".png", ".jpg", ".jpeg"]);

// Open the picker for the user to pick a file
openPicker.pickSingleFileAsync().then(function (file) {
    if (file) {
        // Application now has read/write access to the picked file
        WinJS.log && WinJS.log("Picked photo: " + file.name, "sample", "status");
    } else {
        // The picker was dismissed with no selected file
        WinJS.log && WinJS.log("Operation cancelled.", "sample", "status");
    }
});

internal bool EnsureUnsnapped()
{
    // FilePicker APIs will not work if the application is in a snapped state.
    // If an app wants to show a FilePicker while snapped, it must attempt to unsnap first
    bool unsnapped = ((ApplicationView.Value != ApplicationViewState.Snapped) || ApplicationView.TryUnsnap());
    if (!unsnapped)
    {
        NotifyUser("Cannot unsnap the sample.", NotifyType.StatusMessage);
    }

    return unsnapped;
}

IReadOnlyList<StorageFile> files = await openPicker.PickMultipleFilesAsync();
if (files.Count > 0)
{
    StringBuilder output = new StringBuilder("Picked files:\n");
    // Application now has read/write access to the picked file(s)
    foreach (StorageFile file in files)
    {
        output.Append(file.Name + "\n");
    }
    OutputTextBlock.Text = output.ToString();
}
else
{
    OutputTextBlock.Text = "Operation cancelled.";
}

openPicker.pickMultipleFilesAsync().then(function (files) {
    if (files.size > 0) {
        // Application now has read/write access to the picked file(s)
        var outputString = "Picked files:\n";
        for (var i = 0; i < files.size; i++) {
            outputString = outputString + files[i].name + "\n";
        }
        WinJS.log && WinJS.log(outputString, "sample", "status");
    } else {
        // The picker was dismissed with no selected file
        WinJS.log && WinJS.log("Operation cancelled.", "sample", "status");
    }
});

Hinweise

Informationen zum Zugreifen auf Dateien und Ordner finden Sie unter Schnellstart: Zugreifen auf Dateien mit Dateiauswahl.

Informationen zur Verwendung dieser API außerhalb von UWP-Apps finden Sie unter Aufrufen von Interop-APIs aus einer .NET-App.

Versionsverlauf

Konstruktoren

Eigenschaften

Methoden

Gilt für:

Weitere Informationen

• Beispiel zur Dateiauswahl
• Schnellstart: Zugreifen auf Dateien mit Dateiauswahl
• Beispiel für Blobs
• Anzeigen von WinRT UI-Objekten, die von CoreWindow abhängig sind