C# 从cdn URL下载图像文件

我正在尝试从Asp.net中的以下url下载文件 在img标签中将这个url作为src应用很好，但是我需要将这个图像保存在我的下载文件夹中

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我尝试了WebClient.Download方法、Downloaddata方法和webrequest方法，但它们返回了403个禁止的错误 （我想您必须相应地指定下载文件夹和链接）

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我设法这样下载了它。

让我知道我的答案是否有效。：）

string lnk = @"https://scontent-sit4-1.xx.fbcdn.net/v/t1.0-9/14333603_1289676231065862_2460190844802989442_n.jpg?oh=f6ccebc305e599e6dcc0bb7c994d8ac4&oe=586F4DD8";
WebRequest request = HttpWebRequest.Create(lnk);
((HttpWebRequest)request).AllowAutoRedirect = true;
((HttpWebRequest)request).UserAgent = @"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";
int dataLength;
int bytesRead;
int wroteSoFar = 0;
var response = request.GetResponse();
Stream responseStream = response.GetResponseStream();

byte[] buffer = new byte[1024];
using (FileStream oFile = new FileStream(Path.Combine(Environment.CurrentDirectory, @"img.jpg"), FileMode.Append, FileAccess.Write))
{
    dataLength = (int)response.ContentLength;
    do
    {
        bytesRead = responseStream.Read(buffer, 0, buffer.Length);
        oFile.Write(buffer, 0, bytesRead);
        wroteSoFar += bytesRead;
        //Console.WriteLine($"{(wroteSoFar / 1000).ToString("N0")} KB / {(dataLength / 1000).ToString("N0")} KB");
    }
    while (bytesRead != 0);
}