Cannot implictly convert values

I am having some difficulty with creating a class and passing decimal, date, boolean and even some integer values to the class from my Domain Service in a Visual Studio 2010 C# Silverlight application. There are several articles on this subject on the net but they are currently above my knowledge of C# and WCF and I cannot find a single example that passes anything other than a string or an integer. For the most part I have that working but some of my integer values require a suffix of .Value and some do not. I am not sure why.

The class I am trying to create and use is defined as:

Class to be populated

  public class pmEmployee
    {
        [Key]
        public int id { get; set; }
        [DataMember]
        public string member_num { get; set; }
        public string last_name { get; set; }
        public string first_name { get; set; }
        public string middle_name_or_initial { get; set; }
        public string address1  {get; set; }
        public string address2 { get; set; }
        public string city { get; set; }
        public string state { get; set; }
        public string zip { get; set; }
        public DateTime birth_date { get; set; }
        public DateTime hire_date { get; set; }
        public string home_phone { get; set; }
        public string cell_phone { get; set; }
        public string work_phone_and_extension { get; set; }
        public string work_phone_extension { get; set; }
        public string SSN { get; set; }
        public string clock_num { get; set; }
        public int local_id { get; set; }
        public int site_id { get; set; }        
        public string email_address { get; set; }
        public int member_status_id { get; set; }
        public int member_type_id { get; set; }
        public int member_job_title_id { get; set; }      
        public string Marital  { get; set; }
        public string sex { get; set; }
        public string notes { get; set; }
        public int race_type_id  { get; set; }
        public string urnumber { get; set; }
        public string bad_address_ind { get; set; }
        public int dues_rate_id { get; set; }
        public decimal cope_contribution { get; set; }
        public bool grievance_exists_ind { get; set; }
        public decimal overage_amt {get; set; }
    }


The Domain Service Iqueryable I am hacking away at is:

public IQueryable<pmEmployee> GetEmployee(int EMPID)
        {
            return from emp in ObjectContext.tblEmployees
                   where emp.id == EMPID
                   select new pmEmployee()
                   {
                      id = emp.id,
                       member_num = emp.member_num == null ? null :  emp.member_num,
                       last_name = emp.last_name == null ? null : emp.last_name,
                       first_name = emp.first_name == null ? null : emp.first_name,
                       middle_name_or_initial  = emp.middle_name_or_initial == null ? null : emp.middle_name_or_initial,
                       address1 = emp.address1 == null ? null : emp.address1,
                       address2 = emp.address2 == null ? null : emp.address2,
                       city = emp.city == null ? null : emp.city,
                       state = emp.state == null ? null : emp.state,
                       zip = emp.zip == null ? null : emp.zip,
                       cell_phone = emp.cell_phone == null ? null : emp.cell_phone,
                       local_id = emp.local_id.Value,
                       home_phone = emp.home_phone == null ? null : emp.home_phone,
                       work_phone_and_extension = emp.work_phone_and_extension == null ? null : emp.work_phone_and_extension,
                       work_phone_extension = emp.work_phone_extension  == null ? null : emp.work_phone_extension,
                       SSN = emp.SSN == null ? null :  emp.SSN,
                       clock_num = emp.clock_num == null ? null : emp.clock_num,                      
                       site_id = emp.site_id.Value,
                       email_address = emp.email_address == null ? null : emp.email_address,                      
                       member_status_id = emp.member_status_id.Value,
                       member_type_id = emp.member_type_id.Value,
                     //  member_job_title_id =  emp.member_job_title_id.Value,  
                       Marital = emp.Marital  == null ? null : emp.Marital,
                       sex = emp.sex  == null ? null : emp.sex,
                       notes = emp.notes == null ? null : emp.notes,
                 //Bad      race_type_id  = emp.race_type_id.Value,
                       urnumber = emp.urnumber  == null ? null : emp.urnumber,
                       bad_address_ind = emp.bad_address_ind  == null ? null : emp.bad_address_ind,
                   //    birth_date = (DateTime) emp.birth_date.Value,
                   //   overage_amt = emp.overage_amt
                       
                 //      dues_rate_id = emp.dues_rate_id.Value,
                     
                       
                   };
                   }
                //        overage = double.Parse(emp.overage_amt), CultureInfo.InvariantCulture.NumberFormat)
                //  

I am not sure why some of the integers which are commented out cause problems but when I add them bound to a grid the system goes off to never never land. The date, decimal and booleans. For instance if I hold the mouse over birthdate when it is not commented out it says:

DateTime? tblEmployee.birth_date
No metadata documentation available.


for overage_amt which is a decimal value in the original table I get the message:

Cannot implicitly convert type 'decimal?' to decimal. An explicit conversion exists (are you missing a cast)?

Please don't point me to microsoft articles on WCF I have read them all and do not understand them I am looking for help with my variables.

Thanks,

Larry
fhcdaverpresidentAsked:
Who is Participating?
 
HeiniHogCommented:
This is because the values are stored in the database as "nullable types" - value types that can have the value null. You need to explicitly cast them to the datatype you want:

member_job_title_id =  (int)emp.member_job_title_id.Value,  
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rati_geCommented:
What I see from your code is that you declare variables and then those variables get null value which is why ou get exceptions. You can avoide this by setting variables in this way

 public string? member_num { get; set; }
public? string last_name { get; set; }
public? string  first_name { get; set; }
public? string middle_name_or_initial  { get; set; }

Each instance of a nullable type has two public read-only properties:

HasValue  

HasValue is of type bool. It is set to true when the variable  contains a non-null value.

Value

Value is of the  same type as the underlying type. If HasValue is true, Value contains a  meaningful value. If HasValue is false, accessing Value will throw a  InvalidOperationException.

Please do not forget to mark this post as helpful.
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rati_geCommented:
there is a little mistyping in my code so do not get confused question mark must go after type declaration as I have it in first field

public string? member_num { get; set; }
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fhcdaverpresidentAuthor Commented:
Hi
Sorry for the inactivity on this question.  Our testing got a little sidetracked with some other fires.  We will follow up on this shortly.
0
 
fhcdaverpresidentAuthor Commented:
Hi,
We ran into enough other formatting issues that we bought ComponentOne's Silverlight Studio, which has a number of these formattting tools available.  
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