WebView.BuildLocalStreamUri(String, String) Metodo

Definizione

Spazio dei nomi:

Windows.UI.Xaml.Controls

Crea un URI che è possibile passare a NavigateToLocalStreamUri.

public:
 virtual Uri ^ BuildLocalStreamUri(Platform::String ^ contentIdentifier, Platform::String ^ relativePath) = BuildLocalStreamUri;

Uri BuildLocalStreamUri(winrt::hstring const& contentIdentifier, winrt::hstring const& relativePath);

public System.Uri BuildLocalStreamUri(string contentIdentifier, string relativePath);

function buildLocalStreamUri(contentIdentifier, relativePath)

Public Function BuildLocalStreamUri (contentIdentifier As String, relativePath As String) As Uri

Parametri

contentIdentifier

String

Platform::String

winrt::hstring

Un identificatore univoco per il contenuto che fa riferimento all'URI. In questo modo viene definita la radice dell'URI.

relativePath

String

Platform::String

winrt::hstring

Percorso della risorsa, rispetto alla radice.

Restituisce

Uri Uri

L'URI creato combinando e normalizzando il contentIdentifier e il relativoPath.

Esempio

Nell'esempio di codice seguente viene illustrato come usare questo metodo con un resolver che serve un file dal pacchetto dell'app. Per un esempio completo, vedere l'esempio di controllo WebView XAML.

public sealed partial class TestPage : Page
{
    // ... other code ...

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        // The 'Host' part of the URI for the ms-local-stream protocol needs to be a combination of the package name
        // and an application-defined key, which identifies the specific resolver, in this case 'MyTag'.

        Uri url = webView4.BuildLocalStreamUri("MyTag","/Minesweeper/default.html");
        StreamUriWinRTResolver myResolver = new StreamUriWinRTResolver();

        // Pass the resolver object to the navigate call.
        webView4.NavigateToLocalStreamUri(url, myResolver);
    }
}

public sealed class StreamUriWinRTResolver : IUriToStreamResolver
{
    public IAsyncOperation<IInputStream> UriToStreamAsync(Uri uri)
    {
        if (uri == null)
        {
            throw new Exception();
        }
        string path = uri.AbsolutePath;

        // Because of the signature of the this method, it can't use await, so we 
        // call into a separate helper method that can use the C# await pattern.
        return GetContent(path).AsAsyncOperation();
    }

    private async Task<IInputStream> GetContent(string path)
    {
        // We use a package folder as the source, but the same principle should apply
        // when supplying content from other locations
        try
        {
            Uri localUri= new Uri("ms-appx:///html" + path);
            StorageFile f = await StorageFile.GetFileFromApplicationUriAsync(localUri);
            IRandomAccessStream stream = await f.OpenAsync(FileAccessMode.Read);
            return stream.GetInputStreamAt(0);
        }
        catch (Exception) { throw new Exception("Invalid path"); }
    }
}

Vedi anche

• NavigateToLocalStreamUri(Uri, IUriToStreamResolver)
• Esempio di controllo WebView XAML