[英]Batch upload using HttpClient.PutAsync()
I am trying to use HttpClient.PutAsync() to upload several images to Windows Azure storage at the same time. 我正在尝试使用HttpClient.PutAsync()同时将多个图像上传到Windows Azure存储。 The code snippet looks like:
该代码段如下所示:
Task<HttpResponseMessage> putThumbnail = httpclient.PutAsync(new Uri(ThumbnailSas), thumbcontent);
Task<HttpResponseMessage> putImage = httpclient.PutAsync(new Uri(ImageSas), imagecontent);
Task.WaitAll(new Task<HttpResponseMessage>[] {putThumbnail, putImage});
Strangely in this way the server does not return at all so Task.WaitAll will wait forever. 奇怪的是,服务器根本不返回,因此Task.WaitAll将永远等待。
if I change the code using await, the server returns and I can get the result correctly. 如果我使用await更改代码,服务器将返回并且我可以正确获得结果。
HttpResponseMessage result = await httpclient.PutAsync(new Uri(ThumbnailSas), thumbcontent);
How can I batch upload images using HttpClient.PutAsync? 如何使用HttpClient.PutAsync批量上传图像?
You shouldn't block on async
code, as I describe on my blog . 如我在博客中所述 ,您不应阻止
async
代码。
In this case, you can use Task.WhenAll
: 在这种情况下,您可以使用
Task.WhenAll
:
Task<HttpResponseMessage> putThumbnail = ...;
Task<HttpResponseMessage> putImage = ...;
await Task.WhenAll(putThumbnail, putImage);
Also see Figure 5 in my MSDN article on async
best practices or the end of my async
intro blog post . 另请参阅我的MSDN文章中有关
async
最佳实践的图5或async
介绍博客文章的结尾。
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