通过HTTP Post下载文件,我哪里出错了？

Question

我试图通过HTTP帖子从Datacash下载报告,使用此页面作为参考,我无法弄清楚我哪里出错了.

我的方法如下:

private static void DownloadDatacashData(int howManyDays)
{
    string post, url, group, user, password, startDate, endDate, type, csvFile;

    url = "https://reporting.datacash.com/reporting2/csvlist?";

    group = "123456";
    user = "autoreport";
    password = "foobar";
    startDate = DateTime.Now.AddDays(howManyDays).ToString("yyyy-MM-dd");
    endDate = DateTime.Now.ToString("yyyy-MM-dd");
    type = "stl";

    post = String.Format(@"group={0}&user={1}&password={2}&start_date={3}&end_date={4}&type={5}", group, user, password, startDate, endDate, type);

    var request = (HttpWebRequest)WebRequest.Create(url);
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version11;
    request.Method = "POST";
    request.ContentLength = 0;

    var postBytes = Encoding.ASCII.GetBytes(post);

    request.ContentType = "application/x-www-form-urlencoded";
    request.ContentLength = postBytes.Length;
    var requestStream = request.GetRequestStream();

    requestStream.Write(postBytes, 0, postBytes.Length);
    requestStream.Close();

    var response = (HttpWebResponse)request.GetResponse();

    var sr = new StreamReader(response.GetResponseStream());
    csvFile = sr.ReadToEnd();
    sr.Close();

    var sw = new StreamWriter("C:\\foo\\bar.csv", false);
    sw.Write(csvFile);
    sw.Flush();
    sw.Close();
}

首先,发布帖子.但我总是得到一个文件"Error:Report type not found".如果我更改了URL,则会收到错误,因此该URL肯定会响应HTTP帖子.我有没有试过这个？在初始URL中,有和没有？在帖子字符串的开头.

我已经尝试与Datacash的技术支持取得联系,他们无法帮助我.我给他们发了我正在使用的代码,我得到的所有代码都是他们没有任何错误.

凭证是正确的,密码是字母和数字的组合(没有特殊字符).

我知道你们中很少有人会使用datacash,但是看看我的代码和这里的信息,我正在做的事情有什么明显的错误吗？我绕圈子走了.

谢谢

Answer 1

对于像这样的事情,你的代码似乎太复杂了.尝试简化:

private static void DownloadDatacashData(int howManyDays)
{
    var url = "https://reporting.datacash.com/reporting2/csvlist";
    using (var client = new WebClient())
    {
        var values = new NameValueCollection
        {
            { "group", "123456" },
            { "user", "autoreport" },
            { "password", "foobar" },
            { "start_date", DateTime.Now.AddDays(howManyDays).ToString("yyyy-MM-dd") },
            { "end_date", DateTime.Now.ToString("yyyy-MM-dd") },
            { "type", "stl" },
        };
        byte[] result = client.UploadValues(url, values);
        File.WriteAllBytes("C:\\foo\\bar.csv", result);
    }
}