Question

Currently I am performing join on two tables, the result could be multiple rows.

The return type is IList<string> currently but I am getting an error

Error:

Cannot implicitly convert type System.Collections.Generic.List<AnonymousType#1> to System.Collections.Generic.IList<string>

Here is my expression

public IList<string> GetPendingSubGroups()
{
    using (var db = new DataClasses1DataContext())
    {
        var pendingSubGroup =
            db.sys_Log_Account_SubGroups.Where(subGroup => subGroup.cAuthorizedStatus.Equals("Pending")).Join(
                db.sys_Account_Primary_Groups, subGroup => subGroup.nGroupCode, group => group.nGroupCode,
                (subGroup, group) => new
                                         {
                                             cSubGroupName = subGroup.cSubGroupName,
                                             cAddedBy = subGroup.cAddedBy,
                                             dAddedOn = subGroup.dAddedOn
                                         }).ToList();
        return pendingSubGroup;
    }
}

Can anyone help me out with this?

Answer 1

Create a class to represent your result

public class SubGroup
{
    public string Name {get; set;}
    public string AddedBy {get; set;}        
    public DateTime AddedOn {get; set;}
}

And return a list of that class

public IList<SubGroup> GetPendingSubGroups()
    {
        using(var db=new DataClasses1DataContext())
        {
            var pendingSubGroup = db.sys_Log_Account_SubGroups.Where(subGroup => subGroup.cAuthorizedStatus.Equals("Pending")).Join(db.sys_Account_Primary_Groups, subGroup => subGroup.nGroupCode, group => group.nGroupCode,(subGroup, group) => new SubGroup
            {
                Name = subGroup.cSubGroupName,
                AddedBy = subGroup.cAddedBy,
                AddedOn = subGroup.dAddedOn 
            }).ToList();  
            return pendingSubGroup; 
        }
    }

note this change buried in the linq

(subGroup, group) => new *SubGroup*
            {
                Name = subGroup.cSubGroupName,
                AddedBy = subGroup.cAddedBy,
                AddedOn = subGroup.dAddedOn 
            }).ToList();