使用C#下载一个Internet上的文件主要是依靠HttpWebRequest/HttpWebResonse和WebClient。具体处理起来还有同步和异步两种方式,所以我们其实有四种组合。
1、使用HttpWebRequest/HttpWebResonse和WebClient
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();if (!response.ContentType.ToLower().StartsWith("text/"))
{
//Value = SaveBinaryFile(response, FileName);
byte[] buffer = new byte[1024];
Stream outStream = System.IO.File.Create(FileName);
Stream inStream = response.GetResponseStream();int l;
do
{
l = inStream.Read(buffer, 0, buffer.Length);
if (l > 0)
outStream.Write(buffer, 0, l);
}
while (l > 0);outStream.Close();
inStream.Close();
}
2、使用WebClient
string url = "http://www.mozilla.org/images/feature-back-cnet.png";
WebClient myWebClient = new WebClient();
myWebClient.DownloadFile(url,"C:\\temp\\feature-back-cnet.png");
3、异步调用
异步调用可参见:http://wenku.baidu.com/view/f47cc781e53a580216fcfe64.html