C# Http地址下载文件到指定目录。

private void button_Click(object sender, EventArgs e)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://1.cn/2.rar");
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
Stream responseStream = response.GetResponseStream();
Stream stream = new FileStream(@"d:\文件夹\2.rar", FileMode.Create);
byte[] bArr = new byte[1024];
int size = responseStream.Read(bArr, 0, bArr.Length);
while (size > 0)
{
stream.Write(bArr, 0, size);
size = responseStream.Read(bArr, 0, bArr.Length);
}
stream.Close();
responseStream.Close();
}