How Can realize a one-to-many relationship via RIA service in lightswitch

Question

I have to query a large data and the normal query in lightswitch is so slow that I decided to use RIA service to improve the query.However I am not very good at RIA service. I follow
this tutorial and set up a very simple RIA service. In my project, I have a one-to-many relationship but I don't know how to
realize it . here is the Relationship:
public class CombinedStadium
private EcoStatus _ecoStatus;
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Category { get; set; }
public string Owner { get; set; }
public string Street { get; set; }
public string OrgCode { get; set; }
public string Place { get; set; }
public int? FoundYear { get; set; }
public double? LandArea { get; set; }
public double? BuildingArea { get; set; }
public double? SiteArea { get; set; }
public double? Investment { get; set; }
public double? Fiscal { get; set; }
public double? CommonWeal { get; set; }
public double? SelfRaised { get; set; }
public double? SocialDonate { get; set; }
public double? Other { get; set; }
public double? Longitude { get; set; }
public double? Latitude { get; set; }
public string Note { get; set; }
public byte[] Photo { get; set; }
[Include]
[Association("Stadium_EcoStatus", "Id", "EcoId", IsForeignKey = false)]
public virtual EcoStatus EcoStatus
get { return this._ecoStatus; }
set
this._ecoStatus = value;
if (value == null)
this.Id = value.Id;
I am not sure whether it is right or not. But I want "one CombinedStadium Entity may contains
more than one(many)EcoStatus Entities.
I tried the code above and update my datasource, I got the error "the entity
LightSwitchApplication.Implementation.EcoStatus's property doesn't supported by the type of StadiumEcoReference".
How Can I realize a one-to-many relationship via RIA and use it in my lightswitch program?
thx !!!

Answer 1

namespace WCF_RIA_Project
public class CombinedStadium
[Key]
public int SiteId { get; set; }
public string Name { get; set; }
public string Category { get; set; }
public string Owner { get; set; }
public string Street { get; set; }
public string OrgCode { get; set; }
public string Place { get; set; }
public int? FoundYear { get; set; }
public double? LandArea { get; set; }
public double? BuildingArea { get; set; }
public double? SiteArea { get; set; }
public double? Investment { get; set; }
public double? Fiscal { get; set; }
public double? CommonWeal { get; set; }
public double? SelfRaised { get; set; }
public double? SocialDonate { get; set; }
public double? Other { get; set; }
public double? Longitude { get; set; }
public double? Latitude { get; set; }
public string Note { get; set; }
public byte[] Photo { get; set; }
[Include]
[Association("Stadium_EcoStatus", "SiteId", "StadiumId")]
public IQueryable<CombindeEcoStatus> EcoStatus { get; set; }
public class CombindeEcoStatus
[Key]
public int EcoId { get; set; }
public string StatdiumName { get; set; }
public int? StadiumId { get; set; }
public int? Year { get; set; }
public int? EmployeeNum { get; set; }
public string OperateMode { get; set; }
public string OpenStatus { get; set; }
public double? OpeningDays { get; set; }
public string ClientCount { get; set; }
public double? Income { get; set; }
public double? Expend { get; set; }
[Include]
[Association("Stadium_EcoStatus", "StadiumId", "SiteId", IsForeignKey = true)]
public CombinedStadium Stadium
get;
set;
public class WCF_RIA_Service : DomainService
private ApplicationData m_context;
public ApplicationData Context
get
if (this.m_context == null)
string connString =
System.Web.Configuration.WebConfigurationManager
.ConnectionStrings["_IntrinsicData"].ConnectionString;
EntityConnectionStringBuilder builder = new EntityConnectionStringBuilder();
builder.Metadata =
"res://*/ApplicationData.csdl|res://*/ApplicationData.ssdl|res://*/ApplicationData.msl";
builder.Provider =
"System.Data.SqlClient";
builder.ProviderConnectionString = connString;
this.m_context = new ApplicationData(builder.ConnectionString);
return this.m_context;
[Query(IsDefault = true)]
public IQueryable<CombinedStadium> GetAllStadiums()
var stadiumsQuery = from stadium in this.Context.StadiumSet
select new
ID = stadium.Id,
Name = stadium.Name,
Category = stadium.Category.Name,
OwnerParts = stadium.Owner2StadiumMediatorCollection.Select(x => x.Owner.Name),
Street = stadium.Street.Name,
OrgCode = stadium.StadiumBase.OrgCode,
Place = stadium.StadiumBase.Place,
FoundYear = stadium.StadiumBase.FoundYear,
LandArea = stadium.StadiumBase.LandArea,
BuildingArea = stadium.StadiumBase.BuildingArea,
SiteArea = stadium.StadiumBase.SiteArea,
Investment = stadium.StadiumBase.Investment,
Fiscal = stadium.StadiumBase.Fiscal,
CommonWeal = stadium.StadiumBase.CommonWeal,
SelfRaised = stadium.StadiumBase.SelfRaised,
SocialDonate = stadium.StadiumBase.SocialDonate,
Other = stadium.StadiumBase.Other,
Longitude = stadium.StadiumBase.Longitude,
Latitude = stadium.StadiumBase.Latitude,
Note = stadium.StadiumBase.Note,
Photo = stadium.StadiumBase.Photo,
var result = stadiumsQuery.AsEnumerable().Select(x => new CombinedStadium()
SiteId = x.ID,
Name = x.Name,
Category = x.Category,
Owner = string.Join("/", x.OwnerParts),
Street = x.Street,
OrgCode = x.OrgCode,
Place = x.Place,
FoundYear = x.FoundYear,
LandArea = x.LandArea,
BuildingArea = x.BuildingArea,
SiteArea = x.SiteArea,
Investment = x.Investment,
Fiscal = x.Fiscal,
CommonWeal = x.CommonWeal,
SelfRaised = x.SelfRaised,
Other = x.Other,
Longitude = x.Longitude,
Latitude = x.Latitude,
Note = x.Note,
Photo = x.Photo,
}).AsQueryable();
return result;
[Query(IsDefault = true)]
public IQueryable<CombindeEcoStatus> GetAllEcoStatuses()
var stadiumEco = from eco in this.Context.EcoStatusSet
select new CombindeEcoStatus()
EcoId = eco.Id,
StatdiumName = eco.StadiumEco.Name,
StadiumId = eco.StadiumEco.Id,
Year = eco.Year,
EmployeeNum = eco.Employee,
OperateMode = eco.OperateMode,
OpenStatus = eco.OpenStatus,
OpeningDays = eco.OpeningDays,
ClientCount = eco.ClientCount,
Income = eco.Income,
Expend = eco.Expend
return stadiumEco;
protected override int Count<T>(IQueryable<T> queryable)
return queryable.Count();
now I have solved my problem, but when I query the data in Lihgtswitch HTMLClient . I can't get the related entities "CombindeEcoStatus" . How can I write the return value of
GetAllStadiums function to get the related CombindeEcoStatus of each
CombinedStadium?
thanks!