这就是我最终提出的。 关于Windows.Web.Http.HttpClient文档并不多，并且很多在线示例都使用了旧的机制，如ReadAllBytesAsync，这些机制不适用于此HttpClient。

我应该注意到来自MSDN的这个问题帮了我很多，所以感谢那个人。 正如那里的评论所说，这个人必须是世界上唯一知道Windows.Web.Http ！

 using System; using System.Diagnostics; using System.IO; using System.Net; using System.Threading.Tasks; using System.Windows.Media.Imaging; using Windows.Storage.Streams; using Windows.Web.Http; public class ImageLoader { public async static Task LoadImage(Uri uri) { BitmapImage bitmapImage = new BitmapImage(); try { using (HttpClient client = new HttpClient()) { using (var response = await client.GetAsync(uri)) { response.EnsureSuccessStatusCode(); using (IInputStream inputStream = await response.Content.ReadAsInputStreamAsync()) { bitmapImage.SetSource(inputStream.AsStreamForRead()); } } } return bitmapImage; } catch (Exception ex) { Debug.WriteLine("Failed to load the image: {0}", ex.Message); } return null; } } 

 public async void downLoadImage(string url) { using (var client = new HttpClient()) { var response = client.GetAsync(url).Result; BitmapImage bitmap = new BitmapImage(); if (response != null && response.StatusCode == HttpStatusCode.OK) { using (var stream = await response.Content.ReadAsStreamAsync()) { using (var memStream = new MemoryStream()) { await stream.CopyToAsync(memStream); memStream.Position = 0; bitmap.SetSource(memStream.AsRandomAccessStream()); } } HardcodedValues.profilePic = bitmap; } } } 

在.net core web api中，您可以使用以下代码

 [Route("getProductImage/v1")] [HttpGet] public async Task getProductImage(GetProductImageQueryParam parammodel) { using (HttpClient client = new HttpClient()) { MNimg_URL = MNimg_URL + parammodel.modelname; HttpResponseMessage response = await client.GetAsync(MNimg_URL); byte[] content = await response.Content.ReadAsByteArrayAsync(); //return "data:image/png;base64," + Convert.ToBase64String(content); return File(content, "image/png", parammodel.modelname); } } 

这里GetProductImageQueryParam是一个带输入参数的类

更新为8.1 – 10。

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  public async static Task LoadImage(Uri uri) { BitmapImage bitmapImage = new BitmapImage(); try { using (Windows.Web.Http.HttpClient client = new Windows.Web.Http.HttpClient()) { using (var response = await client.GetAsync(uri)) { response.EnsureSuccessStatusCode(); using (MemoryStream inputStream = new MemoryStream()) { await inputStream.CopyToAsync(inputStream); bitmapImage.SetSource(inputStream.AsRandomAccessStream()); } } } return bitmapImage; } catch (Exception ex) { Debug.WriteLine("Failed to load the image: {0}", ex.Message); } return null; }