DeviceInformationCollection Class

Reference

Definition

Namespace:: Windows.Devices.Enumeration

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Edit

Represents a collection of DeviceInformation objects.

public ref class DeviceInformationCollection sealed : IIterable<DeviceInformation ^>, IVectorView<DeviceInformation ^>

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class DeviceInformationCollection final : IIterable<DeviceInformation>, IVectorView<DeviceInformation>

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public sealed class DeviceInformationCollection : IEnumerable<DeviceInformation>, IReadOnlyList<DeviceInformation>

Public NotInheritable Class DeviceInformationCollection
Implements IEnumerable(Of DeviceInformation), IReadOnlyList(Of DeviceInformation)

Inheritance: Object Platform::Object IInspectable DeviceInformationCollection

Attributes: ContractVersionAttribute MarshalingBehaviorAttribute

Implements: IIterable<T> IEnumerable<T> IIterable<DeviceInformation> IEnumerable<DeviceInformation> IVectorView<DeviceInformation> IReadOnlyList<DeviceInformation>

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

var DeviceInformation = Enumeration.DeviceInformation;
DeviceInformation.findAllAsync(deviceClass).then(
    successCallback, 
    errorCallback
);

// Handles successful completion of the findAllAsync method.
function successCallback(deviceInformationCollection) {
    var numDevices = deviceInformationCollection.length;
    document.getElementById("statusMessage").innerHTML = 
        numDevices + " device interface(s) found";
    if (numDevices) {
        for (var i = 0; i < numDevices; i++) {
            printFriendlyNameAndID(deviceInformationCollection[i], 
                document.getElementById("Output"));
        }
    } else {
        document.getElementById("statusMessage").innerHTML = "No devices found";
    }
}

// Handles an error completion of the findAllAsync method.
function errorCallback(e) {
    document.getElementById("statusMessage").innerHTML = 
        "Failed to find devices, error: " + e.message;
}

Remarks

Successful completion of FindAllAsync results in a DeviceInformationCollection containing DeviceInformation objects.

Collection member lists

For JavaScript, DeviceInformationCollection has the members shown in the member lists. In addition, DeviceInformationCollection supports a length property, members of Array.prototype, and using an index to access items.

Enumerating the collection in C# or Microsoft Visual Basic

DeviceInformationCollection is enumerable, so you can use language-specific syntax such as foreach in C# to enumerate the items in the collection. The compiler does the type-casting for you and you won't need to cast to IEnumerable<DeviceInformation> explicitly. If you do need to cast explicitly, for example if you want to call GetEnumerator, cast to IEnumerable<T> with a DeviceInformation constraint.

Properties

Size	The number of DeviceInformation objects in the collection.

Methods

First()	Gets an object that can iterate through the enumerated DeviceInformation objects, starting with the first.
GetAt(UInt32)	Gets the DeviceInformation object at the specified index.
GetMany(UInt32, DeviceInformation[])	Gets a range of DeviceInformation objects.
IndexOf(DeviceInformation, UInt32)	Returns the index of the specified DeviceInformation object in the collection.

Applies to

Delen via