Converting ArrayOfStrings to string array

Question

I have searched for a long time and tried different ways to solve this problem without any success.

My current program is as follows:

• Web service: DAL, Controller and WebService(with web methods)
• Windows form: Controller(receives the web service) and Form

I receive a string array in the DAL that I try to send through the web service to my Controller in the windows form program. But receive the error:

Cannot implicity convert type 'WindowsFormApplication.ServiceReference1.ArrayOfString' to 'System.Collections.Generic.List<string[]>'

Controller in form:

 public List<string[]> GetAllEmployee()
 {
     return client.GetAllEmployee();
 }

Webservice:

public List<string[]> GetAllEmployee()
{
    return cont.GetAllEmployee();
}

DAL:

 public List<string[]> GetAllEmployee()
 {
     GetConnection();
     con.Open();
     stmt = con.CreateCommand();
     stmt.CommandText = "SELECT [No_],[First Name],[Last Name],[Initials],[Job Title],[E-Mail] FROM [CRONUS Sverige AB$Employee]";
     OdbcDataReader reader = stmt.ExecuteReader();

     List<string[]> allEmployee = new List<string[]>();

     String[] cols = new string[5];
     for (int i = 0; i < cols.Length; ++i)
     {
         cols[i] = reader.GetName(i);
     }
     allEmployee.Add(cols);
     while (reader.Read())
     {
         string[] s = new string[cols.Length]; 
         for (int i = 0; i < s.Length; ++i) 
         {
             s[i] = reader.GetValue(i).ToString(); 
         }

         allEmployee.Add(s);
     }
     con.Close();
     return allEmployee;
 }

Controller:

public List<string[]> GetAllEmployee()
{
    return dal.GetAllEmployee();
}

client:

ServiceReference1.WebService1SoapClient client = new ServiceReference1.WebService1SoapClient();

Answer 1

您的服务返回WindowsFormApplication.ServiceReference1.ArrayOfString类型，需要使用ToList方法将其显式转换为List<string> ：

return dal.GetAllEmployee().ToList();