將JSON從GET請求轉換爲C＃Winforms應用程序中的文本框

Question

對於C＃我很新，我正在尋找對以下內容的幫助。

我已經編寫了一些利用公司房屋API獲取與公司有關的信息的代碼（如下）。信息以JSON格式返回。

我需要做些什麼來獲取某些信息，並將其放入表單中已有的文本框中。我編寫的代碼能夠在消息框中返回，但我無法解決如何將其填充到文本框中。

private void getFromCompaniesHouse(object sender, EventArgs e) 
    { 
     try 
     { 
      //Compile request url 
      string url = "https://api.companieshouse.gov.uk/company/" + txtCompanyNumber.Text; 

      // Encode API key to ASCII 
      string api_key = "yfhOb66cRn7ZL1VgdFjVur5cs8u6j__bcNnKj9Qs:"; 
      string encodedKey = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(api_key)); 

      // Make get request using url and encoded API key 
      HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
      request.Method = "GET"; 
      request.Headers.Add("Authorization", "Basic " + encodedKey); 
      request.ContentType = "application/json; charset=utf-8"; 

      var response = (HttpWebResponse)request.GetResponse(); 

      using (var streamReader = new StreamReader(response.GetResponseStream())) 
      { 
       MessageBox.Show(streamReader.ReadToEnd()); 
      } 
     } 
     catch 
     { 
      MessageBox.Show("Cannot Make Request", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 
    } 

的JSON返回這個樣子的：

{ 
"accounts":{ 
"accounting_reference_date":{ 
"month":"12", 
"day":"31" 
}, 
"last_accounts":{ 
"type":"group", 
"made_up_to":"2015-12-31" 
}, 
"next_made_up_to":"2016-12-31", 
"next_due":"2017-09-30", 
"overdue":false 
}, 
"company_number":"08867781", 
"annual_return":{ 
"last_made_up_to":"2016-06-20", 
"overdue":false 
}, 
"jurisdiction":"england-wales", 
"has_been_liquidated":false, 
"date_of_creation":"2014-01-29", 
"undeliverable_registered_office_address":false, 
"company_name":"VIRGIN ATLANTIC LIMITED", 
"registered_office_address":{ 
"address_line_2":"Fleming Way", 
"locality":"Crawley", 
"country":"United Kingdom", 
"region":"West Sussex", 
"address_line_1":"Company Secretariat - The VHQ", 
"postal_code":"RH10 9DF" 
}, 
"type":"ltd", 
"last_full_members_list_date":"2016-06-20", 
"sic_codes":[ 
"70100" 
], 
"has_insolvency_history":false, 
"etag":"cbab10bb8b9dc1db442cb585a63ae208c1265100", 
"company_status":"active", 
"has_charges":false, 
"previous_company_names":[ 
{ 
"name":"VIRGIN ATLANTIC (HOLDINGS) LIMITED", 
"effective_from":"2014-01-29", 
"ceased_on":"2014-05-30" 
} 
], 
"confirmation_statement":{ 
"next_made_up_to":"2017-06-20", 
"overdue":false, 
"next_due":"2017-07-04" 
}, 
"links":{ 
"self":"/company/08867781", 
"filing_history":"/company/08867781/filing-history", 
"officers":"/company/08867781/officers" 
}, 
"registered_office_is_in_dispute":false, 
"can_file":true 
} 

**更新**

我有我的代碼更新到以下幾點：

private void getFromCompaniesHouse(object sender, EventArgs e) 
    { 
     try 
     { 
      //Compile request url 
      string url = "https://api.companieshouse.gov.uk/company/" + txtCompanyNumber.Text; 

      // Encode API key to ASCII 
      string api_key = "yfhOb66cRn7ZL1VgdFjVur5cs8u6j__bcNnKj9Qs:"; 
      string encodedKey = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(api_key)); 

      // Make get request using url and encoded API key 
      HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
      request.Method = "GET"; 
      request.Headers.Add("Authorization", "Basic " + encodedKey); 
      request.ContentType = "application/json; charset=utf-8"; 

      var response = (HttpWebResponse)request.GetResponse(); 
      var rawJson = new StreamReader(response.GetResponseStream()).ReadToEnd(); 

      var json = JObject.Parse(rawJson); //Turns your raw string into a key value lookup 
      string company_name = json["company_name"].ToObject<string>(); 

      txtBusinessName.Text = company_name; 

     } 
     catch 
     { 
      MessageBox.Show("Cannot Make Request", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 
    } 

我可以拉東西從RootObject類，但不能訪問其他任何東西，例如在RegisteredOfficeAddress課。有任何想法嗎？

Answer 1

下面是一個示例的控制檯應用程序（使用JSON.NET）訪問您的公司信息：

using System; 
using System.Collections.Generic; 
using System.Net.Http; 
using System.Net.Http.Headers; 
using System.Text; 
using System.Threading.Tasks; 
using Newtonsoft.Json; 

namespace ConsoleApplication1 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      var task = GetFromCompaniesHouse(); 

      task.Wait(); 

      Console.WriteLine("Press any key to exit..."); 
      Console.ReadKey(); 
     } 

     private static async Task GetFromCompaniesHouse() 
     { 
      var url = "https://api.companieshouse.gov.uk/company/08867781"; 
      var apiKey = "yfhOb66cRn7ZL1VgdFjVur5cs8u6j__bcNnKj9Qs:"; 
      var encodedKey = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(apiKey)); 

      using (var client = new HttpClient()) 
      { 
       var request = new HttpRequestMessage(HttpMethod.Get, url); 

       request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); 
       request.Headers.Add("Authorization", $"Basic {encodedKey}"); 

       var response = await client.SendAsync(request); 
       var content = await response.Content.ReadAsStringAsync(); 
       var company = JsonConvert.DeserializeObject<Company>(content); 

       Console.WriteLine($"Company: {company.company_name}"); 
      } 
     } 
    } 

    public class LastAccounts 
    { 
     public string made_up_to { get; set; } 
     public string type { get; set; } 
    } 

    public class AccountingReferenceDate 
    { 
     public string month { get; set; } 
     public string day { get; set; } 
    } 

    public class Accounts 
    { 
     public LastAccounts last_accounts { get; set; } 
     public string next_due { get; set; } 
     public bool overdue { get; set; } 
     public string next_made_up_to { get; set; } 
     public AccountingReferenceDate accounting_reference_date { get; set; } 
    } 

    public class RegisteredOfficeAddress 
    { 
     public string region { get; set; } 
     public string locality { get; set; } 
     public string address_line_2 { get; set; } 
     public string postal_code { get; set; } 
     public string address_line_1 { get; set; } 
    } 

    public class PreviousCompanyName 
    { 
     public string effective_from { get; set; } 
     public string name { get; set; } 
     public string ceased_on { get; set; } 
    } 

    public class ConfirmationStatement 
    { 
     public string last_made_up_to { get; set; } 
     public string next_made_up_to { get; set; } 
     public string next_due { get; set; } 
     public bool overdue { get; set; } 
    } 

    public class Links 
    { 
     public string self { get; set; } 
     public string filing_history { get; set; } 
     public string officers { get; set; } 
     public string charges { get; set; } 
    } 

    public class Company 
    { 
     public Accounts accounts { get; set; } 
     public string company_name { get; set; } 
     public bool has_been_liquidated { get; set; } 
     public RegisteredOfficeAddress registered_office_address { get; set; } 
     public string status { get; set; } 
     public string last_full_members_list_date { get; set; } 
     public string date_of_creation { get; set; } 
     public List<string> sic_codes { get; set; } 
     public bool undeliverable_registered_office_address { get; set; } 
     public string type { get; set; } 
     public string company_number { get; set; } 
     public string jurisdiction { get; set; } 
     public bool has_insolvency_history { get; set; } 
     public string etag { get; set; } 
     public string company_status { get; set; } 
     public bool has_charges { get; set; } 
     public List<PreviousCompanyName> previous_company_names { get; set; } 
     public ConfirmationStatement confirmation_statement { get; set; } 
     public Links links { get; set; } 
     public bool registered_office_is_in_dispute { get; set; } 
     public bool can_file { get; set; } 
    } 
}