c# - 下载文件并同时读取

Question

我用这种方法下载了一个文件:

WebClient WC = new WebClient();
WC.DownloadFile(url, filePath);

我希望同时读取文件:

var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None);

但我总是:

The process cannot access the file 'filePath' because it is being used by another process.

可以同时下载和阅读吗？

编辑

我现在下载文件:

var req = (HttpWebRequest)HttpWebRequest.Create(url);
                var fileStream = new FileStream(filePath,
                    FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);

                using (var resp = req.GetResponse())
                {
                    using (var stream = resp.GetResponseStream())
                    {
                        byte[] buffer = new byte[0x10000];
                        int len;
                        while ((len = stream.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            fileStream.Write(buffer, 0, len);
                        }
                    }
                }

仍然出现错误....

Answer 1

var req = (HttpWebRequest)HttpWebRequest.Create(url);
using (var resp = req.GetResponse())
{
    using (var stream = resp.GetResponseStream())
    {
        byte[] buffer = new byte[0x10000];
        int len;
        while ((len = stream.Read(buffer, 0, buffer.Length))>0)
        {
            //Do with the content whatever you want
            // ***YOUR CODE*** 
            fileStream.Write(buffer, 0, len);
        }
    }
}