我正在编写一个 MVC Web API 来进行异步 HttpWebRequest 调用。我得到了 2 个不同的例外。下面是我正在使用的方法。
第一个例外是：“此流不支持查找操作。” 它发生在 responseStream 上。
第二个例外是：“此流不支持超时”，这发生在 MemoryStream 内容上。
我究竟做错了什么？我一直在谷歌搜索，但没有真正找到任何解决方案。
谢谢，
朗达
private async Task GetHtmlContentAsync(string requestUri, string userAgent, string referrer, bool keepAlive, TimeSpan timeout, bool forceTimeoutWhileReading, string proxy, string requestMethod, string type) { //string to hold Response string output = null;
//create request object
var request = (HttpWebRequest)WebRequest.Create(requestUri);
var content = new MemoryStream();
request.Method = requestMethod;
request.KeepAlive = keepAlive;
request.Headers.Set("Pragma", "no-cache");
request.Timeout = (Int32)timeout.TotalMilliseconds;
request.ReadWriteTimeout = (Int32)timeout.TotalMilliseconds;
request.Referer = referrer;
request.Proxy = new WebProxy(proxy);
request.UserAgent = userAgent;
try
{
using (WebResponse response = await request.GetResponseAsync().ConfigureAwait(false))
{
using (Stream responseStream = response.GetResponseStream())
{
if (responseStream != null)
{
await responseStream.CopyToAsync(content);
}
}
var sr = new StreamReader(content);
output = sr.ReadToEnd();
sr.Close();
}
}
catch (Exception ex)
{
output = string.Empty;
var message = ("The API caused an exception in the " + type + ".\r\n " + requestUri + "\r\n" + ex);
Logger.Write(message);
}
return output;
}