共用方式為

WebView.CapturePreviewToStreamAsync(IRandomAccessStream) 方法

  • 參考

定義

命名空間:
Windows.UI.Xaml.Controls
編輯

建立目前 WebView 內容的影像，並將它寫入指定的資料流程。

public:
 virtual IAsyncAction ^ CapturePreviewToStreamAsync(IRandomAccessStream ^ stream) = CapturePreviewToStreamAsync;
/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncAction CapturePreviewToStreamAsync(IRandomAccessStream const& stream);
[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncAction CapturePreviewToStreamAsync(IRandomAccessStream stream);
function capturePreviewToStreamAsync(stream)
Public Function CapturePreviewToStreamAsync (stream As IRandomAccessStream) As IAsyncAction

參數

stream
IRandomAccessStream

要寫入映射的資料流程。

傳回

IAsyncAction

等候擷取作業的非同步動作。

屬性
RemoteAsyncAttribute

範例

此範例示範如何使用這個方法來建立目前內容的縮圖影像。 如需完整的範例，請參閱 WebView 控制項範例。

private async void bookmarkBtn_Click(object sender, RoutedEventArgs e)
{
    InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream();
    await webView8.CapturePreviewToStreamAsync(ms);

    // Create a small thumbnail.
    int longlength = 180, width = 0, height = 0;
    double srcwidth = webView8.ActualWidth, srcheight = webView8.ActualHeight;
    double factor = srcwidth / srcheight;
    if (factor < 1)
    {
        height = longlength;
        width = (int)(longlength * factor);
    }
    else
    {
        width = longlength;
        height = (int)(longlength / factor);
    }
    BitmapSource small = await resize(width, height, ms);

    BookmarkItem item = new BookmarkItem();
    item.Title = webView8.DocumentTitle;
    item.PageUrl = webView8.Source;
    item.Preview = small;

    bookmarks.Add(item);
}

適用於

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