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我在使用他们提供的诺基亚成像 SDK 示例之一中使用的一些示例代码时遇到问题。本质上，我正在尝试将图像保存到独立存储。我正在重用的代码已在解决方案的其他地方成功使用，但是当我尝试使用它时没有错误，但它不会继续执行以下语句。本质上，在该StorePhoto方法中，一旦IBuffer buffer = await App.PhotoModel.RenderFullBufferAsync();调用就不会发生错误，但不会运行低于实际执行保存到隔离存储操作的代码，因此不会保存图像。

SavePage.xaml.cs

private static string _photoModelPath = @"\Lockscreen\v1\PhotoModel";
private static string _photoModelBufferFilename = @"buffer.data";

public async static void StorePhoto()
    {
        string _photoModelPath = @"\Lockscreen\v1\LockScreen";
        string _photoModelBufferFilename = @"buffer.data";

        using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (!storage.DirectoryExists(_photoModelPath))
            {
                storage.CreateDirectory(_photoModelPath);
            }

            if (storage.FileExists(_photoModelPath + @"\" + _photoModelBufferFilename))
            {
                storage.DeleteFile(_photoModelPath + @"\" + _photoModelBufferFilename);
            }

            IBuffer buffer = await App.PhotoModel.RenderFullBufferAsync();  //code exiting method with no error

            if (buffer != null)
            {
                IsolatedStorageFileStream originalFile = storage.CreateFile(_photoModelPath + @"\" + _photoModelBufferFilename);

                Stream bufferStream = buffer.AsStream();

                bufferStream.CopyTo(originalFile);
                bufferStream.Flush();
                bufferStream.Close();
                bufferStream.Dispose();

                originalFile.Flush();
                originalFile.Close();
                originalFile.Dispose();
            }                  
        }
    }

MainPage.xaml.cs

private async void _saveItem_Click(object sender, EventArgs e)
    {
         Helpers.SaveHelper.StorePhoto(); //calling the StorePhoto method here
    }

PhotoModel.cs（来自诺基亚成像 SDK 示例）

/// <summary>
    /// Renders current image with applied filters to a buffer and returns it.
    /// Meant to be used where the filtered image is for example going to be
    /// saved to a file.
    /// </summary>
    /// <returns>Buffer containing the filtered image data</returns>
    public async Task<IBuffer> RenderFullBufferAsync()
    {
        using (BufferImageSource source = new BufferImageSource(_buffer))
        using (FilterEffect effect = new FilterEffect(source) { Filters = _components })
        using (JpegRenderer renderer = new JpegRenderer(effect))
        {
            return await renderer.RenderAsync();
        }
    }
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1 回答 1

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原来要解决这个问题，我必须将保存图像的代码放入我最初调用该方法的同一页面中，并且它还需要是 Task 类型，以便 async/await 能够正常工作。

于 2014-01-31T03:02:22.107 回答