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try
{
//正常业务代码
}
catch (WebException ex)
{
//需判断response是否==null
WebResponse exResponse = ex.Response;
if (exResponse == null)
{
throw;
}
else
{
receiveStreamOut = exResponse.GetResponseStream();
srOut = new StreamReader(receiveStreamOut, Encoding.UTF8);
string result = srOut.ReadToEnd();
exResponse.Close();
//抛出内部错误
throw new Exception(result, ex);
}
}