C# Http下载指定文件存储到特定目录

    C# Http下载指定文件存储到特定目录，下面是标准用法代码：

///
/// Http下载文件：下载指定文件存储到特定目录
///
public static string HttpDownloadFile(string remoteUrl)
{
    // 设置参数
    HttpWebRequest request = WebRequest.Create(remoteUrl) as HttpWebRequest;
    //发送请求并获取相应回应数据
    HttpWebResponse response = request.GetResponse() as HttpWebResponse;
    //直到request.GetResponse()程序才开始向目标网页发送Post请求
    Stream responseStream = response.GetResponseStream();

    string localPath = AppDomain.CurrentDomain.BaseDirectory + @"QRCode\MyQRCode.jpg";
    //创建本地文件写入流
    Stream stream = new FileStream(localPath, FileMode.Create);
    byte[] bArr = new byte[1024];
    int size = responseStream.Read(bArr, 0, (int)bArr.Length);
    while (size > 0)
    {
        stream.Write(bArr, 0, size);
        size = responseStream.Read(bArr, 0, (int)bArr.Length);
    }
    stream.Close();
    responseStream.Close();
    return localPath;
}

remoteUrl值说明：

remoteUrl的值举例

上面的URL值放到浏览器是可以直接打开文件的：

运行效果：

参考文献：