从Windows Phone 8中的URL检索JSON字符串-Java 学习之路

我想从一个网址JSON字符串中的Windows Phone 8应用程序（页面需要验证，我想这是我的代码失败），我使用下面的代码：

public WebClient client = new WebClient();
    public string result;

    public void DoStuff()
    {
        string username = "username";
        string password = "password";
        string url = "myurl";
        client.Credentials = new NetworkCredential(username, password);
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
        client.DownloadStringAsync(new Uri(url));
    }
    void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        result = e.Result;
    }

但是，当运行应用程序时，我得到 System.Reflection.TargetInvocationException at e.result

进入 InnerException 我看到了这个：

[System.Net.WebException] {System.Net.WebException：WebClient请求期间发生异常 . ---> System.Net.ProtocolViolationException：使用此方法的请求不能有请求正文 . 在System.Net.Browser.AsyncHelper.BeginOnUI（SendOrPostCallback beginMethod，对象状态）在System.Net.Browser.ClientHttpWebRequest.EndGetResponse（IAsyncResult的asyncResult）在System.Net.WebClient.GetWebResponse（WebRequest的请求，IAsyncResult的结果）在System.Net .WebClient.DownloadBitsResponseCallback（IAsyncResult result）---内部异常堆栈跟踪结束---} System.Net.WebException

我尝试过使用HttpClient，但我遇到了同样的问题 . 我想知道是否有人知道如何解决这个问题 .

谢谢！

UPDATE: 我've tried navigating to the page on my phone using IE, and then the IE Mobile says: 2602987 . That'为什么应用程序也崩溃了？

1 回答

GET Method (with/without Credentials)

private string username = "user";
private string password = "passkey";
private string myUrl = "http://some_url.com/id?=20";
private WebClient client = new WebClient();

private void retrieveJson()
{
        client.Credentials = new NetworkCredential(username, password);
        client.Encoding = Encoding.UTF8;
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
        client.DownloadStringAsync(new Uri(myUrl), UriKind.Relative);
}
//WebClient String (json content) Download
private void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
        // You will get you Json Data here..
        var myJSONData = e.Result;
        JObject JsonData = JObject.Parse(myJSONData);
        //Do something with json 
        //Ex: JsonData["Array1"][5]
}

POST Method (with/without Credentials)

private string username = "user";
private string password = "passkey";
private string myUrl = "http://some_url.com/id?=20";
private WebClient client = new WebClient();
private string parameters = "{\"I_NAME\":\"0000"\"}"; //Example

private void postMethod()
{
        client.Credentials = new NetworkCredential(username, password);
        client.Encoding = Encoding.UTF8;
        client.Headers["Content-Length"] = parameters.Length.ToString();
        client.UploadStringCompleted += new UploadStringCompletedEventHandler(client_UploadStringCompleted);

        client.UploadStringAsync(new Uri(myUrl), "POST", parameters);
}

private void client_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
{
        if (e.Error == null)
        {
            var myJSONData = e.Result;
            JObject JsonData = JObject.Parse(myJSONData);
        }
}

回复于 2024-04-30T04:57:46+08:00

从Windows Phone 8中的URL检索JSON字符串

1 回答

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