如何从HttpResponseMessage获取特定的标头值 [英] How to get an specific header value from the HttpResponseMessage

问题描述

我正在进行HTTP呼叫.我的响应在HttpResponseMessage对象的标头部分中包含会话代码X-BB-SESSION.如何获取特定的标头值?

I'm making an HTTP call. My response contains a session code X-BB-SESSION in the header section of the HttpResponseMessage object. How do I get that specific header value?

我正在使用foreach语句来遍历所有标头(

I am using a foreach statement to iterate through all the headers (MSDN link). However the compiler keeps saying that it cannot be done:

foreach statement cannot operate on variables of type
  System.net.http.headers.cachecontrolheadervalue because
  'System.net.http.headers.cachecontrolheadervalue' doesn't contain
  a public definition for 'GetEnumerator'

这是我正在尝试的代码:

This is the code I'm trying:

//Connection code to BaasBox

HttpResponseMessage response = await client.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead);
if (response.IsSuccessStatusCode)
{
    //get the headers
    HttpResponseHeaders responseHeadersCollection = response.Headers;
    foreach (var value in responseHeadersCollection.CacheControl)  --> HERE
    {
        string sTemp = String.Format("CacheControl {0}={1}", value.Name, value.Value);
    } else
{
    Console.WriteLine("X-BB-SESSION: NOT Found");
}

我试图从中获取值(X-BB-SESSION值)的标头内容类似于:

The header content from where I'm trying to get the value (X-BB-SESSION value) is something like:

Access-Control-Allow-Origin: *    
Access-Control-Allow-Headers: X-Requested-With    
X-BB-SESSION: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

推荐答案

您应该能够使用

You should be able to use the TryGetValues method.

HttpHeaders headers = response.Headers;
IEnumerable<string> values;
if (headers.TryGetValues("X-BB-SESSION", out values))
{
  string session = values.First();
}

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