c# Turning a linq database record into a class instance
I'm not sure if this is the correct way to do things, it seems quite long winded and I want to check that this is a good way of turning a linq result into a class:
/// <summary>
/// A job header
/// </summary>
public class JobHeader
{
public int ID { get; set; }
public int? UserID { get; set; }
public int? ClientID { get; set; }
public string JobName { get; set; }
public string Code { get; set; }
public DateTime? DateAdded { get; set; }
public int? StatusID { get; set; }
public bool UniversalQuantity { get; set; }
public bool UniversalDelivery { get; set; }
public bool UniversalDeliveryDates { get; set; }
public bool BuyerHidden { get; set; }
public bool FullfillmentDone { get; set; }
public string TNTCode { get; set; }
public int? ContactUserID { get; set; }
public string ContactDepartment { get; set; }
public string ConactName { get; set; }
public DateTime? DateSubmitted { get; set; }
public bool CampaignJob { get; set; }
public bool UniversalBusinessUnits { get; set; }
public bool TenderJob { get; set; }
public Jobs.JobLine[] JobLines { get; set; }
/// <summary>
/// Create instance on db record ID
/// </summary>
public JobHeader(int? RecordID)
{
if (RecordID != null)
{
using (MainContext db = new MainContext())
{
var q = (from h in db.tblJobHeaders where h.id == Rec开发者_开发技巧ordID select h).SingleOrDefault();
if (q != null)
LoadByRec(q);
}
}
}
public JobHeader(tblJobHeader Rec)
{
LoadByRec(Rec);
}
/// <summary>
/// Sets properties to match database record
/// </summary>
private void LoadByRec(tblJobHeader Rec)
{
this.ID = Rec.id;
this.UserID = Rec.userID;
this.ClientID = Rec.ClientID;
this.JobName = Rec.JobName;
this.Code = Rec.JobCode;
this.DateAdded = Rec.dateAdded;
this.StatusID = Rec.statusID;
this.UniversalQuantity = Rec.uniQty == 1;
this.UniversalDelivery = Rec.uniDelivery == 1;
this.UniversalDeliveryDates = Rec.uniDeliveryDates == 1;
this.BuyerHidden = Rec.buyerHidden == 1;
this.FullfillmentDone = Rec.fulfilmentDone == 1;
this.TNTCode = Rec.jobTntCode;
this.ContactUserID = Rec.JobClientContactID;
this.ContactDepartment = Rec.JobClient;
this.ConactName = Rec.JobAccountHandler;
this.DateSubmitted = Rec.dateSubmitted;
this.CampaignJob = Rec.isCampaignJob == 1;
this.UniversalBusinessUnits = Rec.uniBusUnits == 1;
this.TenderJob = Rec.isTenderJob == 1;
}
}
Firstly I'm aware that the data source is not well formed (please ignore incorrect types etc etc), there's not much I can do about that at the moment. My query in specifically in regards to is this the best way to create an instance of a class from a Linq result? It becomes very long winded with a lot of properties.
Your approach is totally valid, if a little manual. I have worked on numerous projects that use this approach for creating C# objects from database queries. There are however a few technologies that can be used to generate types from queries:
- Typed DataSets - a slightly dated approach
- Linq to SQL
- Entity Framework
All of the above can be used to generate types based on database schema.
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