我有一个 WP7 应用程序,我正在尝试重建一个 HTTPWebRequest,我已使用同步方法(最后粘贴)在其他地方成功编写但它在 WP7 中不起作用,我认为是因为我做错了异步这些方法的版本。
我相信这个问题源于 Compact Framework 上的非工作代码只能发送一个 bytearray[] - 我没有发送 json 字符串的选项。如果我在有效的代码中发送一个字节数组,我也会在那里得到一个错误。有不同的选择吗?
这是我的代码 - 这不起作用。在最后一个方法的第 2 行抛出异常 - “Using(var respons ...)”:
public void CreateUser()
{
var request = (HttpWebRequest)WebRequest.Create("http://staging.cloudapp.net:8080/api/users/");
request.Method = "POST";
request.ContentType = "text/json; charset=utf-8";
request.BeginGetRequestStream(new AsyncCallback(RequestCallback), request);
}
private static void RequestCallback(IAsyncResult result)
{
HttpWebRequest request = (HttpWebRequest)result.AsyncState;
using (Stream postStream = request.EndGetRequestStream(result))
{
User user = new User("Windows", "Phone", "USCA");
Formatting formatting = new Formatting();
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
string json = JsonConvert.SerializeObject(user, formatting, settings);
byte[] byteArray = Encoding.UTF8.GetBytes(json);
postStream.Write(byteArray, 0, json.Length);
}
request.BeginGetResponse(new AsyncCallback(ResponseCallback), request);
}
private static void ResponseCallback(IAsyncResult result)
{
var request = (HttpWebRequest)result.AsyncState;
using (var response = (HttpWebResponse)request.EndGetResponse(result))
{
using (Stream streamResponse = response.GetResponseStream())
{
StreamReader reader = new StreamReader(streamResponse);
string responseString = reader.ReadToEnd();
reader.Close();
}
}
}
此代码有效(同一请求的非紧凑框架版本):
HttpWebRequest request = HttpWebRequest.Create("http://staging.cloudapp.net/api/users/") as HttpWebRequest;
request.Method = "POST";
request.ContentType = "text/json";
using (var writer = new StreamWriter(request.GetRequestStream()))
{
User user = new user("Other", "Guy", "USWC");
Formatting formatting = new Formatting();
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
string json = JsonConvert.SerializeObject(user, formatting, settings);
writer.Write(json);
}
var response = request.GetResponse() as HttpWebResponse;
using (var reader = new StreamReader(response.GetResponseStream()))
{
var responseText = reader.ReadToEnd();
return responseText;
}
谢谢你的帮助!