IServiceProviderprovider=(IServiceProvider)HttpContext.Current;

HttpWorkerRequestwr=(HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));

byte[]bs=wr.GetPreloadedEntityBody();

if(!wr.IsEntireEntityBodyIsPreloaded())
{
Int  n=1024;
byte[]  bs2=newbyte[n];

while(wr.ReadEntityBody(bs2,n)>0)
    {
    
    }

}

string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1);
        string uriString = @"D:\" + DateTime.Now.ToShortDateString();
        string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);//文件名称+后缀
        if (uriString.EndsWith(@"\") == false)
        {
            uriString = uriString + @"\";
        }
        uriString = uriString + fileName;
        // 创建WebClient实例
        WebClient myWebClient = new WebClient();
        myWebClient.Credentials = CredentialCache.DefaultCredentials;
        // 要上传的文件
        FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
        BinaryReader r = new BinaryReader(fs);
        try
        {
            //使用UploadFile方法可以用下面的格式
            //myWebClient.UploadFile(uriString,"PUT",fileNamePath);
            byte[] postArray = r.ReadBytes((int)fs.Length);
            Stream postStream = myWebClient.OpenWrite(uriString, "PUT");
            if (postStream.CanWrite)
            {
                postStream.Write(postArray, 0, postArray.Length);
            }
            else
            {
                return "No Write.";
            }
            postStream.Close();
            return "Succefull";
        }
        catch (Exception ex)
        {
            return "Error:" + ex.Message;
        }