WindowsRuntimeStreamExtensions.AsOutputStream(Stream) WindowsRuntimeStreamExtensions.AsOutputStream(Stream) WindowsRuntimeStreamExtensions.AsOutputStream(Stream) Method

Définition

Important

Cette API n’est pas conforme CLS.

Convertit un flux managé dans .NET pour les applications du Windows Store en un flux de sortie Windows Runtime.Converts a managed stream in the .NET for Windows Store apps to an output stream in the Windows Runtime.

public:
[System::Runtime::CompilerServices::Extension]
 static Windows::Storage::Streams::IOutputStream ^ AsOutputStream(System::IO::Stream ^ stream);
[System.CLSCompliant(false)]
public static Windows.Storage.Streams.IOutputStream AsOutputStream (this System.IO.Stream stream);
static member AsOutputStream : System.IO.Stream -> Windows.Storage.Streams.IOutputStream

Paramètres

stream
Stream Stream Stream

Flux à convertir.The stream to convert.

Retours

Objet IOutputStream Windows Runtime qui représente le flux converti.A Windows Runtime IOutputStream object that represents the converted stream.

Exceptions

stream a la valeur null.stream is null.

Le flux ne prend pas en charge la lecture.The stream does not support reading.

Exemples

L’exemple suivant montre comment utiliser les AsInputStream méthodes et AsOutputStream> pour convertir un flux managé vers et à partir d’un flux de Windows Runtime.The following example shows how to use the AsInputStream and AsOutputStream> methods to convert a managed stream to and from a stream in the Windows Runtime.

using System;
using System.IO;
using System.Text;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

namespace ExampleApplication
{
    public sealed partial class BlankPage : Page
    {
        System.Text.UnicodeEncoding ue;
        byte[] bytesToWrite;
        byte[] bytesToAdd;
        int totalBytes;

        public BlankPage()
        {
            this.InitializeComponent();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            ue = new System.Text.UnicodeEncoding();
            bytesToWrite = ue.GetBytes("example text to write to memory stream");
            bytesToAdd = ue.GetBytes("text added through datawriter");
            totalBytes = bytesToWrite.Length + bytesToAdd.Length;
        }

        private async void CreateButton_Click(object sender, RoutedEventArgs e)
        {
            byte[] bytesRead = new byte[totalBytes];
            using (MemoryStream memStream = new MemoryStream(totalBytes))
            {
                await memStream.WriteAsync(bytesToWrite, 0, bytesToWrite.Length);

                DataWriter writer = new DataWriter(memStream.AsOutputStream());
                writer.WriteBytes(bytesToAdd);
                await writer.StoreAsync();

                memStream.Seek(0, SeekOrigin.Begin);

                DataReader reader = new DataReader(memStream.AsInputStream());
                await reader.LoadAsync((uint)totalBytes);
                reader.ReadBytes(bytesRead);
                Results.Text = ue.GetString(bytesRead, 0, bytesRead.Length);
            }
        }
    }
}
Imports Windows.Storage.Streams

Public NotInheritable Class BlankPage
    Inherits Page

    Dim ue As System.Text.UnicodeEncoding
    Dim bytesToWrite() As Byte
    Dim bytesToAdd() As Byte
    Dim totalBytes As Integer


    Protected Overrides Sub OnNavigatedTo(e As Navigation.NavigationEventArgs)
        ue = New System.Text.UnicodeEncoding()
        bytesToWrite = ue.GetBytes("example text to write to memory stream")
        bytesToAdd = ue.GetBytes("text added through datawriter")
        totalBytes = bytesToWrite.Length + bytesToAdd.Length
    End Sub

    Private Async Sub CreateButton_Click(sender As Object, e As RoutedEventArgs)
        Dim bytesRead(totalBytes - 1) As Byte
        Using memStream As MemoryStream = New MemoryStream(totalBytes)
            Await memStream.WriteAsync(bytesToWrite, 0, bytesToWrite.Length)

            Dim writer As DataWriter = New DataWriter(memStream.AsOutputStream())
            writer.WriteBytes(bytesToAdd)
            Await writer.StoreAsync()

            memStream.Seek(0, SeekOrigin.Begin)

            Dim reader As DataReader = New DataReader(memStream.AsInputStream())
            Await reader.LoadAsync(CType(totalBytes, UInteger))
            reader.ReadBytes(bytesRead)
            Results.Text = ue.GetString(bytesRead, 0, bytesRead.Length)
        End Using
    End Sub
End Class

Voici le code XAML associé à l’exemple précédent.Here's the XAML code that is associated with the previous example.

<Page
    x:Class="ExampleApplication.BlankPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:ExampleApplication"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <StackPanel Background="{StaticResource ApplicationPageBackgroundBrush}" VerticalAlignment="Center" HorizontalAlignment="Center">
        <Button Name="CreateButton" Content="Write and read with stream" Click="CreateButton_Click"></Button>
        <TextBlock Name="Results"></TextBlock>
    </StackPanel>
</Page>

Remarques

Notes

Dans Visual Basic et C#, vous pouvez appeler cette méthode comme une méthode d’instance sur n’importe quel Streamobjet de type.In Visual Basic and C#, you can call this method as an instance method on any object of type Stream. Lorsque vous utilisez la syntaxe des méthodes d'instance pour appeler cette méthode, omettez le premier paramètre.When you use instance method syntax to call this method, omit the first parameter. Pour plus d’informations, consultez méthodes d’extension (Visual Basic) ou méthodesC# d’extension (Guide de programmation).For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

S’applique à