PushStreamContent与StreamContent的区别
本文探讨了PushStreamContent与StreamContent在WebAPI场景下的使用区别。PushStreamContent适用于实时推送数据到流的情况，例如流媒体视频；而StreamContent则更适合于允许用户下载文件的场景。当内容长度未知且数据接收同时进行时，如流媒体视频场景，使用PushStreamContent并通过分块传输编码发送响应。
PushStreamContent is for scenarios where you need to 'push' data to the stream, where as StreamContent 'pulls' data from the stream.
example：
if I want to "stream" content in the "streaming video" sense of the word use PushStreamContent but if I want to let someone "download a file" then use StreamContent
The "streaming video" scenario is one, where you do not know the total content length upfront and you are writing to the destination stream as you are receiving the video feed from somewhere. This is the reason when using PushStreamContent response is sent in chunked transfer encoding as we do not know the content length upfront.
http://stackoverflow.com/questions/16168683/webapi-streamcontent-vs-pushstreamcontent
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