发送 JSON 流读取 XML 响应

Question

我有一个独特的请求，我需要发送 JSON POST 请求但读取 XML GET。我在下面试过这个，但是我得到了

的错误

You must write ContentLength bytes to the request stream before calling [Begin]GetResponse.

为了使我的 XML GET 能够成功读取响应，我需要进行哪些更改？

public bool PerformPost(Dictionary<string, string> dictFormValues, string strPageTitle, string strPageURL, ref string strMessage)
{
    string strEndpointURL = string.Format("websitegoeshere");
    System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();
    string strPostData = "";
    foreach (var d in dictFormValues) { strPostData += d.Key + "=" + Server.UrlEncode(d.Value) + "&"; }
    strPostData += "hs_context=";
    HttpWebRequest r = (System.Net.HttpWebRequest)WebRequest.Create(strEndpointURL);
    r.Method = "POST";
    r.Accept = "application/json";
    r.ContentType = "application/x-www-form-urlencoded";
    r.ContentLength = strPostData.Length;
    r.KeepAlive = false;
    Stream datastream = r.GetRequestStream();
    WebResponse response = r.GetResponse();
    datastream = response.GetResponseStream();
    StreamReader reader = new StreamReader(datastream);
    string responsefromserver = reader.ReadToEnd();
    var xml = System.Xml.Linq.XElement.Parse(responsefromserver);
    if (xml.Elements("sid").FirstOrDefault().Value == "1") { return true; }
    else
    {
        var errors = xml.Elements("fail");
        foreach (var error in errors.Elements("fail"))
        {
            strMessage = error.Value;
            return false;
        }
    }
    reader.Close();
    datastream.Close();
    response.Close();
    return true;
}

Answer 1

您还没有将 post 数据写入请求流。在调用 GetResponse 之前，您需要先调用 datastream.Write。

例如：

var buffer = Encoding.UTF8.GetBytes(strPostData);
r.ContentLength = buffer.Length;
datastream.Write(buffer, 0, buffer.Length);
datastream.Close();

发送 JSON 流读取 XML 响应

Send JSON Stream Read XML Response

c#

xml

asp.net

json

webforms