WCF服務上下文。響應

Question

我想將ASMX web服務轉換爲WCF web服務，問題是它一直說上下文在當前上下文中不存在。 這裏是我的代碼：

using System; 
using System.Collections.Generic; 
using System.ServiceModel; 
using System.ServiceModel.Activation; 
using System.Data; 
using System.Data.SqlClient; 
using System.Web.Script.Serialization; 


[ServiceContract(Namespace = "")] 
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] 
public class PhBookService 
{ 

    [OperationContract] 
    public void GetAllCities() 
    { 
     List<Cities> listCity = new List<Cities>(); 

     SqlConnection connection = new SqlConnection("Data Source=BS-HP-PC-11\\SQLEXPRESS;Initial Catalog=PhoneBookData; Integrated Security=true; User ID=phonebook;Password=phone"); 
     using (connection) 
     { 
      SqlCommand command = new SqlCommand("select * from d_City", connection); 
      connection.Open(); 
      SqlDataReader reader = command.ExecuteReader(); 
      while (reader.Read()) 
      { 
       Cities City = new Cities(); 
       City.CityID = Convert.ToInt32(reader["CityID"]); 
       City.CityN = reader["CityN"].ToString(); 
       listCity.Add(City); 
      } 
     } 
     JavaScriptSerializer javascript = new JavaScriptSerializer(); 
     Context.Response.Write(javascript.Serialize(listCity)); -- this line here is where I get the error. 
    } 

} 

添加任何類型的使用系統的「東西」似乎並沒有爲我工作。我該怎麼辦？

P.S.這是我的ajax請求。

Answer 1

我不確定你是否包含了所有的代碼，但是WCF服務通常包含一些東西，比如代表你的合同的接口。在你的情況下，你應該返回一個城市列表。

話雖這麼說，我會組織你的代碼有點不同：

• DataContract爲你的城市型代表您的ServiceContract其中包括 OperationContract的

• 實現A類

• 接口ServiceContract（接口）

  [DataContract] 
  public class Cities 
  { 
      [DataMember] 
      public string CityN {get;set;} 
  
      [DataMember] 
      public int CityID {get;set;} 
  } 
  
  [ServiceContract] 
  public interface ICities 
  { 
      [OperationContract] 
      List<Cities> GetAllCities(); 
  } 
  
  public class PhBookService : ICities 
  { 
      public List<Cities> GetAllCities() 
      { 
       List<Cities> listCity = new List<Cities>(); 
  
       SqlConnection connection = new SqlConnection("Data Source=BS-HP-PC-11\\SQLEXPRESS;Initial Catalog=PhoneBookData; Integrated Security=true; User ID=phonebook;Password=phone"); 
       using (connection) 
       { 
        SqlCommand command = new SqlCommand("select * from d_City", connection); 
        connection.Open(); 
        SqlDataReader reader = command.ExecuteReader(); 
        while (reader.Read()) 
        { 
         Cities City = new Cities(); 
         City.CityID = Convert.ToInt32(reader["CityID"]); 
         City.CityN = reader["CityN"].ToString(); 
         listCity.Add(City); 
        } 
       } 
  
       return listCity; 
      } 
  }