C#下載網絡文件的方法

使用C#下載一個Internet上的文件主要是依靠HttpWebRequest/HttpWebResonse和WebClient。具體處理起來還有同步和異步兩種方式，所以我們其實有四種組合。

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/p_w_picpaths/feature-back-cnet.png";
WebClient myWebClient = new WebClient();
myWebClient.DownloadFile(url,"C:\\temp\\feature-back-cnet.png");

3、異步調用

異步調用可參見：http://wenku.baidu.com/view/f47cc781e53a580216fcfe64.html