HttpWebRequest使用如下：
第一种：使用Using 释放资源
/// <summary>
/// Http Get请求返回数据
/// </summary>
/// <param name="url">Http请求URL</param>
/// <returns>返回Http请求的结果</returns>
public string HttpGetMethod(string url, int timeOut = 10)
{
string strResult = null;
try
{
if (string.IsNullOrEmpty(url))
{
return null;
}
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Timeout = timeOut * 1000;
using (HttpWebResponse wb = (HttpWebResponse)request.GetResponse())
{
using (Stream stream = wb.GetResponseStream())
{
using (StreamReader streamReader = new StreamReader(stream, Encoding.UTF8))
{
strResult = streamReader.ReadToEnd();
}
}
}
}
catch (Exception ex)
{
throw;//LoggerService.Log.Error($"Http Get请求{url}返回数据失败，原因：{ex.ToString()}");
}
return strResult;
}
第二种：使用close 释放资源
/// <summary>
/// Http Get请求返回数据
/// </summary>
/// <param name="url">Http请求URL</param>
/// <returns>返回Http请求的结果</returns>
public string HttpGetMethod2(string url, int timeOut = 10)
{
if (string.IsNullOrEmpty(url))
{
return null;
}
HttpWebRequest request = null;
HttpWebResponse response = null;
Stream streamReceive = null;
StreamReader streamReader = null;
string strResult = null;
try
{
request = (HttpWebRequest)WebRequest.Create(url);
request.Timeout = timeOut * 1000;
ServicePointManager.DefaultConnectionLimit = 200;
response = (HttpWebResponse)request.GetResponse();
streamReceive = response.GetResponseStream();
streamReader = new StreamReader(streamReceive, Encoding.UTF8);
strResult = streamReader.ReadToEnd();
streamReader.Close();
streamReader.Dispose();
streamReceive.Close();
streamReceive.Dispose();
response.Close();
request.Abort();
}
catch (Exception ex)
{
throw;// LoggerService.Log.Error($"Http Get请求{url}返回数据失败，原因：{ex.ToString()}");
}
finally
{
if (streamReader != null)
{
streamReader.Close();
streamReader.Dispose();
}
if (streamReceive != null)
{
streamReceive.Close();
streamReceive.Dispose();
}
if (response != null)
{
response.Close();
}
}
return strResult;
}
HttpWebRequest使用的2种基本写法，各种response，streamReceive ，streamReader 资源都释放了，看似没有什问题，其实只要写个while死循环，每次都去请求，你会发现，运行不了几次就阻塞了，原因很简单就是还有个HttpWebRequest对象没有释放，其实很多时候释放了Stream和Response还远远不够，客户端的Request还是在保持着，无法及时释放占有的资源，而是需要Net的GC.Collect()系统垃圾回收器来回收，因此无法保证资源的及时释放，所以一般很容易阻塞，就会出现上次的请求在处理，导致本次请求发送不出去。HttpWebRequest及时释放就是让HttpWebRequest在不需要的时候及时释放资源，这样可以重复使用而不会阻塞。
在程序的finally中添加下面这句就ok了。
if (request != null)
{
request.Abort();
}
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