在c# wpf中从Memorystream获取Imagesource

Question

如何使用 C# 从 WPF 中的 MemoryStream 获取 ImageSource ？或将 MemoryStream 转换为 ImageSource 以将其显示为 wpf 中的图像？

Answer 1

using (MemoryStream memoryStream = ...)
{
    var imageSource = new BitmapImage();
    imageSource.BeginInit();
    imageSource.StreamSource = memoryStream;
    imageSource.EndInit();

    // Assign the Source property of your image
    image.Source = imageSource;
}

Answer 2

Additional to @Darin Dimitrov answer if you disposed the stream before assigning to Image.Source nothing will show, so be careful

例如，Next 方法将不起作用，来自我使用 LiteDB 的一个项目，

public async Task<BitmapImage> DownloadImage(string id)
{
    using (var stream = new MemoryStream())
    {
        var f = _appDbManager.DataStorage.FindById(id);
        f.CopyTo(stream);
        var imageSource = new BitmapImage {CacheOption = BitmapCacheOption.OnLoad};
        imageSource.BeginInit();
        imageSource.StreamSource = stream;
        imageSource.EndInit();
        return imageSource;
    }
}

您不能使用上一个函数返回的 imageSource

但此实现将起作用

public async Task<BitmapImage> DownloadImage(string id)
{
    // TODO: [Note] Bug due to memory leaks, if we used Using( var stream = new MemoryStream()), we will lost the stream, and nothing will shown
    var stream = new MemoryStream();
    var f = _appDbManager.DataStorage.FindById(id);
    f.CopyTo(stream);
    var imageSource = new BitmapImage {CacheOption = BitmapCacheOption.OnLoad};
    imageSource.BeginInit();
    imageSource.StreamSource = stream;
    imageSource.EndInit();
    return imageSource;
}