从 c# wpf 中的 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以在 wpf 中将其显示为图像？

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

如果您在分配给Image.Source之前处置了 stream ，则除了@Darin Dimitrov 答案之外，什么都不会显示，所以要小心

例如，Next 方法将不起作用， From one of my projects using LiteDB

 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; } }

你不能使用从最后一个 function 返回的imageSource

但是这个实现会起作用

 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; }