正在获取json数组,空指针引用异常
我需要把这个拿出来,并在列表中显示出来。我正在做的是正在获取json数组,空指针引用异常,json,windows-phone-7,nullreferenceexception,Json,Windows Phone 7,Nullreferenceexception,我需要把这个拿出来,并在列表中显示出来。我正在做的是 {"names":["name1","name2","name3","name4"]} 这是我在读了博客文章后做的。我得到了NullReferenceException。 请告诉我哪里做错了,或者用其他方法做同样的事情。首先学习如何解析JSON数据。将其视为JSON字符串。 public partial class MainPage : PhoneApplicationPage { // Constructor public
{"names":["name1","name2","name3","name4"]}
这是我在读了博客文章后做的。我得到了NullReferenceException
。
请告诉我哪里做错了,或者用其他方法做同样的事情。首先学习如何解析JSON数据。将其视为JSON字符串。
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
getdata();
}
private void getdata()
{
string uri = "URL";
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(new Uri(uri));
req.BeginGetResponse(new AsyncCallback(show), req);
}
private void show(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
StreamReader stream1 = new StreamReader(response.GetResponseStream());
string s1 = stream1.ReadToEnd();
var ser = new DataContractJsonSerializer(typeof(brands));
var stream = new MemoryStream(Encoding.Unicode.GetBytes(s1));
var bb = (brands)ser.ReadObject(stream);
foreach (var ev in bb.Names)
{
textBlock1.Text = ev.Name.ToString();
}
}
String jsonData=@“{”name“:[“name1”、“name2”、“name3”、“name4”]}”;
var brands=JsonConvert.DeserializeObject(jsonData);
foreach(品牌名称中的var项目)
{
控制台写入线(项目);
}
你的品牌课是这样的
String jsonData = @"{""names"":[""name1"",""name2"",""name3"",""name4""]}";
var brands = JsonConvert.DeserializeObject<Brands>(jsonData);
foreach (var item in brands.names)
{
Console.WriteLine(item);
}
大众品牌
{
公共列表名称{get;set;}
}
上面的代码解释了如何解析json数据。现在,从web服务获取json数据,因为您的请求不是POST请求(它似乎是从您的代码中获取的),所以您可以使用一个简单的WebClaint
public class Brands
{
public List<string> names { get; set; }
}
void getData()
{
WebClient WebClient=新的WebClient();
webClient.DownloadStringCompleted+=新的DownloadStringCompletedEventHandler(webClient\u DownloadStringCompleted);
下载StringAsync(新Uri(“url”));
}
void wc_DownloadStringCompleted(对象发送方,DownloadStringCompletedEventArgs e)
{
var brands=JsonConvert.DeserializeObject(如Result);
foreach(品牌名称中的var项目)
{
控制台写入线(项目);
}
}
查看此博客,了解任何其他疑问:
public class Brands
{
public List<string> names { get; set; }
}
void getData()
{
WebClient webClient = new WebClient();
webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
webClient.DownloadStringAsync(new Uri("url"));
}
void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
var brands = JsonConvert.DeserializeObject<Brands>(e.Result);
foreach (var item in brands.names)
{
Console.WriteLine(item);
}
}