消费wcf服务Windows窗体应用程序

Question

我正在使用Windows窗体应用程序中的wcf服务。我正在尝试从sql数据库创建基于用户emu类型的用户登录系统。当我将值1输入到文本框中时，它应该返回全职雇员方法，否则将值2写入文本框中它应该返回兼职雇员方法，但它不工作期待..

这里是Employee类代码....

[KnownType(typeof(FullTimeEmployee))] 
    [KnownType(typeof(PartTimeEmployee))] 
    [DataContract(Namespace = "http://pragimtech.com/Employee")] 
    public class Employee 
    { 
     private int _id; 
     private string _name; 
     private string _gender; 
     private DateTime _dateOfBirth; 

     [DataMember(Order = 1)] 
     public int Id 
     { 
      get { return _id; } 
      set { _id = value; } 
     } 

     [DataMember(Order = 2)] 
     public string Name 
     { 
      get { return _name; } 
      set { _name = value; } 
     } 

     [DataMember(Order = 3)] 
     public string Gender 
     { 
      get { return _gender; } 
      set { _gender = value; } 
     } 

     [DataMember(Order = 4)] 
     public DateTime DateOfBirth 
     { 
      get { return _dateOfBirth; } 
      set { _dateOfBirth = value; } 
     } 

     [DataMember(Order = 5)] 
     public EmployeeType Type { get; set; } 
    } 
    [DataContract(Name = "EmployeeType")] 
    public enum EmployeeType 
    { 
     [EnumMember] 
     FullTimeEmployee = 1, 
     [EnumMember] 
     PartTimeEmployee = 2 
    } 
} 

这里是我的全部时间和Employee类兼职员工的类继承...

 public class FullTimeEmployee : Employee 
     { 
      public int AnnualSalary { get; set; } 
     } 
     public class PartTimeEmployee : Employee 
     { 
      public int HourlyPay { get; set; } 
      public int HoursWorked { get; set; } 
     } 

这里是方法获取Employee方法来访问emp基于员工类型loyee ...

public Employee GetEmployee(int Id) 
     { 
      Employee employee = null; 
      string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString; 
      using (SqlConnection con = new SqlConnection(cs)) 
      { 
       SqlCommand cmd = new SqlCommand("spGetEmployee1", con); 
       cmd.CommandType = CommandType.StoredProcedure; 
       SqlParameter parameterId = new SqlParameter(); 
       parameterId.ParameterName = "@EmployeeType"; 
       parameterId.Value = Id; 
       cmd.Parameters.Add(parameterId); 
       con.Open(); 
       SqlDataReader reader = cmd.ExecuteReader(); 
       while (reader.Read()) 
       { 
        if ((EmployeeType)reader["EmployeeType"] == EmployeeType.FullTimeEmployee) 
        { 
         return employee; 
         }     } 
        else if ((EmployeeType)reader["EmployeeType"] == EmployeeType.PartTimeEmployee) 
        { 

         return employee; 
         } 
       } 
      } 
      return employee; 
     } 

这里是我的Windows窗体应用程序......

private void button1_Click(object sender, EventArgs e) 
     { 
      MyService.HalifaxServiceClient myservice = new MyService.HalifaxServiceClient("NetTcpBinding_IHalifaxService"); 
      MyService.Employee employee = myservice.GetEmployee(Convert.ToInt32(txt1.Text)); 
      MyService.FullTimeEmployee ft = new MyService.FullTimeEmployee(); 

      if (employee == myservice.GetEmployee(Convert.ToInt32(txt1.Text).CompareTo(employee.Type))) 
      { 
       FulltimeEmployeeLinkActivites(); 
      } 
      else if (employee == myservice.GetEmployee(Convert.ToInt32(txt1.Text).CompareTo(employee.Type))) 
      { 

       PartTimeEmployeeActivities(); 
      } 
      else 
      { 
       label4.Text = "No infomation found"; 
      } 


     } 

下面是截图，当我运行应用程序...

Answer 1

我在if/else中看到的问题是条件语句完全相同。您可以根据对象的类型分支的一种方法是使用is关键字。

if (employee is FullTimeEmployee) 
{ 
    FulltimeEmployeeLinkActivites(); 
} 
else if (employee is PartTimeEmployee) 
{ 
    PartTimeEmployeeActivities(); 
} 
else 
{ 
    label4.Text = "No information found"; 
} 

我还想补充一点，这未必是最好的做法，但它应该让你你所要求的东西。

除此之外，返回雇员实例的方法永远不会返回有效类型的雇员。看起来GetEmployee方法曾经实例化一个员工实例。它看起来总是返回null。尝试返回适当类型的实例。您还需要使用所需的数据填充实例。

if ((EmployeeType)reader["EmployeeType"] == EmployeeType.FullTimeEmployee) 
{ 
    return new FullTimeEmployee(); 
} 
else if ((EmployeeType)reader["EmployeeType"] == EmployeeType.PartTimeEmployee) 
{ 
    return new PartTimeEmployee(); 
} 

Answer 2

您的元素中有一个令人困惑的名称，而“employee”类似乎没有填充到数据读取器中。

“FullTimeEmployee”是您的类之一，也是您的一个枚举的名称。所以，是不是安全设置你的病情

(EmployeeType)reader["EmployeeType"] == EmployeeType.FullTimeEmployee 

我不能肯定没有你spGetEmployee的代码，但如果从表中与相同名称的返回值也可能是更安全的声明

while(reader.Read()) 
{ 
    employee= new employee(); 
    employee.Id= reader.GetInt32(0); 
    employee.Name= reader.GetString(1); 
    ... 
    employee.EmployeeType=(EmployeeType)reader.GetInt32(4); 

    if(employee.EmployeeType== EmployeeType.FullTimeEmployee) 
    { 
     //Do extra work for this type of employee 
     ... 
     return employee; 
    } 

}