Portable Class Libraries & WebRequest.ContentLength
I have a Portable Class Library that targets ".NET for Windows Store apps" and "Windows Phone 7.5 or higher". I make HTTP POST requests and as of last week, the admins in charge of the back-end decided that I need to send a ContentLength of 0 as opposed to -1 that is defaulted by .NET. I use the WebRequest class but i'm flexible enough to use HttpWebRequest if needed.
Normally I would just use WebRequest.Create and set the ContentLength property. In the PCL library, the ContentLength property is not available. If I try to add a Header with a key of "Content-Length" the framework complains that I should just use the ContentLength property.
Any ideas on how I can set the ContentLength in a PCL?
如果你不能设置ContentLength属性，但它必须设置为0，你可以尝试调用GetRequestStream （或BeginGetRequestStram后面跟着EndGetRequestStream ）而不向Stream本身写任何东西，这应该将ContentLength属性更新为其实际值（0，因为没有写任何东西）。
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