我正在尝试启动下载网页内容的异步任务(在 .NET 4.5 上),但不知何故,这个任务永远不会完成。
我的PageDownloader
班级:
using System.Net;
using System.Text;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using System;
namespace ParserConsole.WebClient
{
public class PageDownloader
{
private System.Net.Http.HttpClient _client;
public PageDownloader()
: this(Encoding.UTF8) { }
private Encoding _encoding;
public PageDownloader(Encoding encoding)
{
_encoding = encoding;
_client = new HttpClient() { Timeout = TimeSpan.FromSeconds(10)};
}
private HttpRequestMessage _request;
private HttpResponseMessage _response;
private string _responseString;
public string GetPageData(string link)
{
_request = new HttpRequestMessage(HttpMethod.Get, link);
_request.Headers.Add("User-Agent", "Chrome/21.0.1180.89");
_request.Headers.Add("Accept", "text/html");
GetResponse().Wait();
GetStringFromResponse().Wait();
return _responseString;
}
private async Task<HttpResponseMessage> GetResponse() {
return _response = await _client.GetAsync(_request.RequestUri);
}
private async Task<string> GetStringFromResponse() {
return _responseString = await _response.Content.ReadAsStringAsync();
}
}
}
我通过调用开始下载页面
new PageDownloader().GetPageData(url);
当我尝试调试代码时,一切都很好,直到GetResponse().Wait()
. 但不知何故 GetResponse()
,任务永远不会完成 - 下一行的断点永远不会到达。我没有例外,应用程序继续运行。有什么建议么?