从 Windows Phone 中的 URL 检索 JSON 字符串 8

Question

我正在尝试从 windows phone 8 应用程序中的 Url 获取 Json 字符串（该页面需要身份验证，我认为这就是我的代码失败了），我正在使用以下代码：

    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;
    }

然而，当运行应用程序时，我在 e.result 得到了一个 System.Reflection.TargetInvocationException

进入 InnerException 我看到了这个：

[System.Net.WebException] {System.Net.WebException: An exception occurred during a WebClient request. ---> System.Net.ProtocolViolationException: A request with this method cannot have a request body. at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result) at System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result) --- End of inner exception stack trace ---} System.Net.WebException

我试过使用 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！

更新： 我试过使用 IE 导航到 phone 上的页面，然后 IE Mobile 显示："Unsupported Address, IE Mobile doesn't support this type of address and can't display this page"。这就是应用程序也崩溃的原因？

Answer 1

GET 方法（with/without 凭据）

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 方法（with/without 凭据）

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);
        }
}

从 Windows Phone 中的 URL 检索 JSON 字符串 8

Retrieve JSON string from URL in Windows Phone 8

.net

c#

json

webclient

windows-phone-8