我一直在研究这个问题，我试图从Json获取公司ID和名称，但我得到：NullExceptionReference（来自：DataContractJsonSerializer）。
这是我的代码：
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
myButton.Click += new RoutedEventHandler(myButton_Click);
}
void myButton_Click(object sender, RoutedEventArgs e)
{
try
{
WebClient webClient = new WebClient();
Uri uri = new Uri("http://sherutnetphpapi.cloudapp.net/?method=Company");
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
try
{
webClient.OpenReadAsync(uri);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
MessageBox.Show("OpenRead Handler");
// OpenWriteCompletedEventArgs temp = (OpenWriteCompletedEventArgs)e;
DataContractJsonSerializer serializer = null;
try
{
serializer = new DataContractJsonSerializer(typeof(ObservableCollection<Brand>));
ObservableCollection<Brand> Brands = serializer.ReadObject(e.Result) as ObservableCollection<Brand>;
foreach (Brand b in Brands)
{
int id = b.CompanyID;
string name = b.Name;
listBrands.Items.Add(id + " " + name);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
这是Brand类（代表公司）：
public class Brand
{/*
public string BrandName { get; set; }
public int BrandId { get; set; }
*/
public string CompanyGUID { get; set; }
public int CompanyID { get; set; }
public int CategoryID { get; set; }
public string Name { get; set; }
public string NameEn { get; set; }
public string Description { get; set; }
public string WebSite { get; set; }
public string Num { get; set; }
public string Num2 { get; set; }
public string FaxNum { get; set; }
public string Email { get; set; }
public string Address { get; set; }
public string Twitter { get; set; }
public string Facebook { get; set; }
public string GooglePlus { get; set; }
public string App_iOS{ get; set; }
public string App_Android { get; set; }
public string App_WinPhone { get; set; }
public string App_BlackBerry { get; set; }
public string Blog { get; set; }
public string Chat { get; set; }
public string Icon { get; set; }
public string SearchTags { get; set; }
public int Rating { get; set; }
public int Public { get; set; }
public int ToShow { get; set; }
public int Revision { get; set; }
}
} 这是我试图阅读的Json：
{"schema":{"CompanyGUID":"TEXT","CompanyID":"INTEGER","CategoryID":"INTEGER","Name":"TEXT","NameEn":"TEXT","Description":"TEXT","WebSite":"TEXT","Num":"TEXT","Num2":"TEXT","FaxNum":"TEXT","Email":"TEXT","Address":"TEXT","Twitter":"TEXT","Facebook":"TEXT","GooglePlus":"TEXT","App_iOS":"TEXT","App_Android":"TEXT","App_WinPhone":"TEXT","App_BlackBerry":"TEXT","Blog":"TEXT","Chat":"TEXT","Icon":"TEXT","SearchTags":"TEXT","Rating":"REAL","Public":"INTEGER","ToShow":"INTEGER","Revision":"INTEGER"},"data":[{"CompanyGUID":"E6D72217-B58E-4618-B8C9-003CD7835AAE","CompanyID":104,"CategoryID":2,"Name":"orange","NameEn":"Orange","Description":"\u05e4\u05e8\u05d8\u05e0\u05e8 \u05ea\u05e7\u05e9\u05d5\u05e8\u05ea","WebSite":"www.orange.co.il","Num":"*054","Num2":"03-9054054","FaxNum":"074-7077858","Email":"forum@orange.co.il","Address":"\u05e8\u05d7\u05d5\u05d1 \u05e2\u05de\u05dc 8, \u05e4\u05d0\u05e8\u05e7 \u05ea\u05e2\u05e9\u05d9\u05d5\u05ea \u05d0\u05e4\u05e7, \u05ea\"\u05d3 435, \u05e8\u05d0\u05e9 \u05d4\u05e2\u05d9\u05df 48103","Twitter":"orangeIL","Facebook":"facebook.com\/ILorange","GooglePlus":"","App_iOS":"http:\/\/itunes.apple.com\/il\/app\/my-orange\/id405509584","App_Android":"https:\/\/play.google.com\/store\/apps\/details?id=il.co.orange.app.myorange","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Orange.png","SearchTags":null,"Rating":3,"Public":1,"ToShow":1,"Revision":7},{"CompanyGUID":"BB00F6EF-3F83-4C5A-BEF4-0A6EDF69E02F","CompanyID":186,"CategoryID":7,"Name":"\u05e9\u05dc\u05de\u05d4 sixt","NameEn":"Shlomo","Description":"","WebSite":"www.shlomo.co.il","Num":"*6880","Num2":"1700-501-502","FaxNum":"","Email":"","Address":"\u05e8\u05d7\u05d5\u05d1 \u05d4\u05d9\u05e6\u05d9\u05e8\u05d4 22, \u05e7\u05e8\u05d9\u05ea \u05d0\u05e8\u05d9\u05d4 \u05e4\u05ea\u05d7 \u05ea\u05e7\u05d5\u05d5\u05d4 49512","Twitter":"","Facebook":"","GooglePlus":"","App_iOS":"http:\/\/itunes.apple.com\/il\/app\/shlomo-sixt-slmh\/id364917805","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Shlomo.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":5},{"CompanyGUID":"8137BAEE-A40E-49BA-AD67-0C460C0B3D91","CompanyID":194,"CategoryID":14,"Name":"\u05e2\u05d9\u05e8\u05d9\u05d9\u05ea \u05d2\u05d1\u05e2\u05ea\u05d9\u05d9\u05dd","NameEn":"Givataym","Description":"\u05e2\u05d9\u05e8\u05d9\u05d9\u05d4","WebSite":"www.givatayim.muni.il","Num":"03-5717222","Num2":"","FaxNum":"03-7313962","Email":"PniyotG@givatayim.muni.il","Address":"\u05e9\u05d9\u05e0\u05e7\u05d9\u05df ,6 \u05d2\u05d1\u05e2\u05ea\u05d9\u05d9\u05dd, \u05de\u05d9\u05e7\u05d5\u05d3 53299","Twitter":"","Facebook":"","GooglePlus":"","App_iOS":"","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Givataym.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":5},{"CompanyGUID":"4F4184AE-9DF3-43B1-AA04-0DC6014D8DF4","CompanyID":193,"CategoryID":14,"Name":"\u05e2\u05d9\u05e8\u05d9\u05d9\u05ea \u05e0\u05ea\u05e0\u05d9\u05d4","NameEn":"Netanya","Description":"","WebSite":"www.netanya.muni.il","Num":"09-8603126","Num2":"","FaxNum":"09-8608855","Email":"orna_p@netanya.muni.il","Address":"\u05d4\u05e6\u05d5\u05e8\u05df 6 \u05e0\u05ea\u05e0\u05d9\u05d4, \u05e7\u05e8\u05d9\u05d9\u05ea \u05e1\u05e4\u05d9\u05e8, \u05de\u05d9\u05e7\u05d5\u05d3 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75363","Twitter":"","Facebook":"facebook.com\/shufersal","GooglePlus":"","App_iOS":"http:\/\/itunes.apple.com\/il\/app\/swprsl\/id411873937","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Shufersal.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":5},{"CompanyGUID":"6E2F633A-BD18-44F9-8D84-14A136FC3C63","CompanyID":153,"CategoryID":10,"Name":"\u05d0\u05e1\u05dd","NameEn":"Osem","Description":"","WebSite":"www.osem.co.il","Num":"1-700-70-76-76","Num2":"","FaxNum":"","Email":"","Address":"\u05e7\u05e8\u05d9\u05ea \u05d0\u05e1\u05dd, \u05ea.\u05d3. 934 \u05e9\u05d5\u05d4\u05dd 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71336","Twitter":"YashirLeumi","Facebook":"","GooglePlus":"","App_iOS":"","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"help1.bankleumi.co.il\/rl\/yashir_tech.html","Icon":"LeumiY.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":6},{"CompanyGUID":"7985AAF2-12FE-40D4-98D5-3E09BEC1C348","CompanyID":127,"CategoryID":6,"Name":"\u05e8\u05db\u05d1\u05ea \u05d9\u05e9\u05e8\u05d0\u05dc","NameEn":"Rail","Description":"","WebSite":"www.rail.co.il","Num":"*5770","Num2":"03-6117000","FaxNum":"03-6104337","Email":"pniyot@rail.co.il","Address":"\u05ea\u05d7\u05e0\u05ea \u05e8\u05db\u05d1\u05ea \u05ea\"\u05d0 \u05e1\u05d1\u05d9\u05d3\u05d5\u05e8 \u05de\u05e8\u05db\u05d6 \u05ea.\u05d3 18085 \u05de\u05d9\u05e7\u05d5\u05d3 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\u05d0\u05d1\u05d9\u05d1","Twitter":"","Facebook":"facebook.com\/mekorrishon","GooglePlus":"","App_iOS":"","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Makor1.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":5},{"CompanyGUID":"4C17E487-240F-4998-B427-49BAC1299D29","CompanyID":133,"CategoryID":9,"Name":"\u05d3\u05d5\u05d0\u05e8 \u05d9\u05e9\u05e8\u05d0\u05dc","NameEn":"Post","Description":"","WebSite":"www.israelpost.co.il","Num":"171","Num2":"1-599-500-171","FaxNum":"","Email":"","Address":"\u05e8\u05d7\u05d5\u05d1 \u05d9\u05e4\u05d5 30, \u05d9\u05e8\u05d5\u05e9\u05dc\u05d9\u05dd 91999","Twitter":"Doar_Israel","Facebook":"facebook.com\/PostIsrael","GooglePlus":"","App_iOS":"http:\/\/itunes.apple.com\/il\/app\/hdw-r-sl-ysr-l\/id495504465","App_Android":"","App_WinPhone":"","App_BlackBerry":"","Blog":"","Chat":"","Icon":"Post.png","SearchTags":null,"Rating":null,"Public":1,"ToShow":1,"Revision":7},...]}
提前致谢！
答案 0 :(得分：1)
尝试以下方法：
[DataContract]
public class Brands
{
[DataMember]
public ObservableCollection<Brand> data;
}
[DataContract(Name = "data")]
public class Brand
{/*
public string BrandName;
public int BrandId;
*/
[DataMember]
public string CompanyGUID;
[DataMember]
public int CompanyID;
[DataMember]
public int CategoryID;
[DataMember]
public string Name;
[DataMember]
public string NameEn;
[DataMember]
public string Description;
[DataMember]
public string WebSite;
[DataMember]
public string Num;
[DataMember]
public string Num2;
[DataMember]
public string FaxNum;
[DataMember]
public string Email;
[DataMember]
public string Address;
[DataMember]
public string Twitter;
[DataMember]
public string Facebook;
[DataMember]
public string GooglePlus;
[DataMember]
public string App_iOS;
[DataMember]
public string App_Android;
[DataMember]
public string App_WinPhone;
[DataMember]
public string App_BlackBerry;
[DataMember]
public string Blog;
[DataMember]
public string Chat;
[DataMember]
public string Icon;
[DataMember]
public string SearchTags;
[DataMember]
public double Rating;
[DataMember]
public int Public;
[DataMember]
public int ToShow;
[DataMember]
public int Revision;
}
然后改为：
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
DataContractJsonSerializer serializer = null;
try
{
serializer = new DataContractJsonSerializer(typeof(Brands));
var Brands = (Brands)serializer.ReadObject(e.Result);
foreach (Brand b in Brands.data)
{
int id = b.CompanyID;
string name = b.Name;
//listBrands.Items.Add(id + " " + name);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
在webClient_OpenReadCompleted方法中。
...欢呼声
它应该有用，
欢呼声，