Access Variables set in Common Project From Server Project in Lightswitch

问题

So I have redone some of the code to the previous question, however the same underlying issue remains. What i am trying to do is this: When my lightswitch application launch through Application.cs i am using a method Application_LoggedIn() to call a function in my Common Project to get all the location a user has access to (this data is stored in a table).

Client Project - Application.cs

  partial void Application_LoggedIn()
    {
        Secure.Membership aa = new Membership();
        aa.membership();
    }

Common Project - After calling the method, i then run my queries in the membership() function to get all the location a user has access to. They are stored in three list: estateList, deptList, groupList;

public void membership() {

    List<int> estateList = new List<int>();
    List<int> deptList = new List<int>();
    List<int> groupList = new List<int>();

    var dws = Application.Current.CreateDataWorkspace().sspData;
    String uName = Application.Current.User.Identity.Name;
    try
    {
        var qryUser = (from a in dws.aspnet_Users
                       where a.UserName == uName
                       select a).Execute().Single();

        int membershipId = qryUser.Payroll_MembershipGroup.Id;
        var qryOrgMember = (from a in dws.PayrollOrg_MembershipGroups
                            where a.Payroll_MembershipGroup.Id == membershipId
                            select a).Execute().ToList();

        foreach (var x in qryOrgMember)
        {

            if (!estateList.Contains(x.Payroll_Organisation.Estate1.ID))
            {
                estateList.Add(x.Payroll_Organisation.Estate1.ID);
            }
            if (!deptList.Contains(x.Payroll_Organisation.Estate1.ID))
            {
                deptList.Add(x.Payroll_Organisation.Department1.ID);
            }
            if (!groupList.Contains(x.Payroll_Organisation.Estate1.ID))
            {
                groupList.Add(x.Payroll_Organisation.Payroll_Group1.ID);
            }
        }
    }
    catch (Exception e)
    {

        Debug.WriteLine("***************" + e.InnerException);
    }

}

What i would like after doing this is to be able to access the 3 lists (estate,dept,group) from inside my server project so i can use the list to perform filters on my entities as shown below.

partial void Employee_Employs_Filter(ref Expression<Func<Employee_Employ, bool>> filter)
{ 
   filter = e => estateList.Contains(e.Estate1.ID) && deptList.Contains(e.Substantive_Department) && groupList.Contains(e.Payroll_Group1.ID);
}

This is what i want to do and i am having problem. Any suggestion would be welcomed. What i tried to do is to create a static class in my Common Project and set the values however as one user rightly pointed out, i cannot do that as it will be null when i try to call it from inside my Server Project. Please help me out here, this is a big issue i am having with this application and is the only remaining part. Thanks in advance.

************ Filter code on server side* @Duran this is what i had on the server side.

public List<User> membership() {

    List<User> aList = new List<User>();
    User aUser = new aUser();


    var dws = Application.Current.CreateDataWorkspace().sspData;
    String uName = Application.Current.User.Identity.Name;
    try
    {
        var qryUser = (from a in dws.aspnet_Users
                       where a.UserName == uName
                       select a).Execute().Single();

        int membershipId = qryUser.Payroll_MembershipGroup.Id;
        var qryOrgMember = (from a in dws.PayrollOrg_MembershipGroups
                            where a.Payroll_MembershipGroup.Id == membershipId
                            select a).Execute().ToList();

        foreach (var x in qryOrgMember)
        {

            aUser.estateId = x.estateId
            auser.deptId = x.deptId;
            aUser.groupId = x.groupId;

            aList.add(aUser);
        }
    }
    catch (Exception e)
    {

        Debug.WriteLine("***************" + e.InnerException);
    }

    return aList;

}

public class User{

    public estateId{set;get:}
    public deptId{set;get:}
    public groupId{set;get:}

}

Now in my filter i would call the method membership() that returns a list<User>

partial void Employee_Employs_Filter(ref Expression<Func<Employee_Employ, bool>> filter)
{ 
    var x = membership();
    estId[int] = new [x.count()];
    deptId[int] = new [x.count()];
    groupId[int] = new [x.count()];

    for (int i=0; i<x.count();i++){
         estId[i] = x.elementAt(i).estateId;
         deptId[i] = x.elementAt(i).deptId;
         groupId[i] = x.elementAt(i).groupId;

    }

   filter = e => estId.Contains(e.Estate1.ID) && deptId.Contains(e.Substantive_Department) && groupId.Contains(e.Payroll_Group1.ID);
}

I have to put a filter similar to the one above on ALL my tables, thats when i get the stackoverflow error. It works when its on ONE table alone but not when it is on all the tables. What am i doing wrong?

回答1:

Even though the code in the Common project is "shared" between the Client & Server projects, any variables created there have their own separate instances, one in the Client project, & one in the Server project.

So you're not really accessing a single shared variable at all, which is why when you set a value on one tier, the value on the other tier doesn't reflect that change in value, because they're actually two distinct instances of the variable.

来源：https://stackoverflow.com/questions/21170173/access-variables-set-in-common-project-from-server-project-in-lightswitch