的Windows Phone 8 - 负载byte []数组与绑定XAML图像

问题描述

我将图像存储为字节[]数组，因为我不能将它们存储为BitmapImage的。该ShotItem类将被存储在IsolatedStorage在一个ObservableCollection。

I am storing images as byte[] arrays because I can't store them as BitmapImage. The ShotItem class will be stored in IsolatedStorage in an observableCollection.

namespace MyProject.Model
{
    public class ShotItem : INotifyPropertyChanged, INotifyPropertyChanging
    {
        private byte[] _shotImageSource;
        public byte[] ShotImageSource
        {
            get
            {
                return _shotImageSource;
            }
            set
            {
                NotifyPropertyChanging("ShotImageSource");

                _shotImageSource = value;
                NotifyPropertyChanged("ShotImageSource");
            }
        }
        ...
    }
}

在我的XAML文件我有以下几点：

In my xaml file I have the following:

<Image Source="{Binding ShotImageSource}" Width="210" Height="158" Margin="12,0,235,0" VerticalAlignment="Top" />

可惜我不能图像作为字节加载直入在XAML图像容器。不知何故，我需要将ShotImageSource的byte []转化为BitmapImage的。我加载了不少图像，以便将这个必须也可以异步完成。

Unfortunately I can't load the image as a byte straight into the Image container in the xaml. I somehow need to convert the ShotImageSource byte[] to BitmapImage. I am loading quite a few images so would this have to also be done asynchronously.

我试图用一个转换器约束力，但我不知道如何获取它的工作。任何帮助将不胜感激。）

I tried to use a converter binding, but I wasn't sure on how to get it to work. Any help would be greatly appreciated :).

推荐答案

下面是一个转换代码将转换您的字节[] 到的BitmapImage ：

Here is the code for a Converter that will convert your byte[] into a BitmapImage:

public class BytesToImageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value != null && value is byte[])
        {
            byte[] bytes = value as byte[];
            MemoryStream stream = new MemoryStream(bytes);
            BitmapImage image = new BitmapImage();

            image.SetSource(stream);

            return image;
        }

        return null;

    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

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