[英]Emulate XmlHttpRequest with a .NET WebClient
带有XmlHttpRequest
AFAIK我可以使用send
方法下载和上传数据。 但WebClient
有很多方法。 我不想要WebClient
所有功能。 我只是想创建一个模拟XmlHttpRequest
的对象,除了它没有XSS限制。 我也不关心将响应作为XML或甚至现在作为字符串。 如果我可以把它作为一个足够好的字节数组。
我认为我可以使用UploadData
作为我的通用方法,但是当尝试使用它下载数据时它会失败,即使它返回响应。 那么如何编写一个行为与XmlHttpRequest
的send
方法一样的方法呢?
编辑:我在这里找到了一个不完整的类,它正是一个XmlHttpRequest
模拟器。 太糟糕了,整个代码都丢失了。
您可以尝试使用此静态函数来执行相同操作
public static string XmlHttpRequest(string urlString, string xmlContent)
{
string response = null;
HttpWebRequest httpWebRequest = null;//Declare an HTTP-specific implementation of the WebRequest class.
HttpWebResponse httpWebResponse = null;//Declare an HTTP-specific implementation of the WebResponse class
//Creates an HttpWebRequest for the specified URL.
httpWebRequest = (HttpWebRequest)WebRequest.Create(urlString);
try
{
byte[] bytes;
bytes = System.Text.Encoding.ASCII.GetBytes(xmlContent);
//Set HttpWebRequest properties
httpWebRequest.Method = "POST";
httpWebRequest.ContentLength = bytes.Length;
httpWebRequest.ContentType = "text/xml; encoding='utf-8'";
using (Stream requestStream = httpWebRequest.GetRequestStream())
{
//Writes a sequence of bytes to the current stream
requestStream.Write(bytes, 0, bytes.Length);
requestStream.Close();//Close stream
}
//Sends the HttpWebRequest, and waits for a response.
httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
if (httpWebResponse.StatusCode == HttpStatusCode.OK)
{
//Get response stream into StreamReader
using (Stream responseStream = httpWebResponse.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream))
response = reader.ReadToEnd();
}
}
httpWebResponse.Close();//Close HttpWebResponse
}
catch (WebException we)
{ //TODO: Add custom exception handling
throw new Exception(we.Message);
}
catch (Exception ex) { throw new Exception(ex.Message); }
finally
{
httpWebResponse.Close();
//Release objects
httpWebResponse = null;
httpWebRequest = null;
}
return response;
}
h :)
您需要使用HttpWebRequest 。
HttpWebRequest rq = (HttpWebRequest)WebRequest.Create("http://thewebsite.com/thepage.html");
using(Stream s = rq.GetRequestStream()) {
// Write your data here
}
HttpWebResponse resp = (HttpWebResponse)rq.GetResponse();
using(Stream s = resp.GetResponseStream()) {
// Read the result here
}
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