c# - Why can't I use my data contracts form my IService? -

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i have following data contracts defined in iservice:

[datacontract] public class pumpclass {     [datamember]     public int id { get; set; }     [datamember]     public double litrespumped { get; set; }     [datamember]     public double price { get; set; }     [datamember]     public string fueltype { get; set; }     [datamember]     public datetime date { get; set; }     [datamember]     public bool requestuse { get; set; }     [datamember]     public bool requestaccepted { get; set; }     [datamember]     public bool finished { get; set; } }  [datacontract] public class dieseltank {     [datamember]     public double maximumlevel { get; set; }     [datamember]     public double warninglevel { get; set; }     [datamember]     public double currentlevel { get; set; }     [datamember]     public bool orderfuel { get; set; } }  [datacontract] public class unleadedtank {     [datamember]     public double maximumlevel { get; set; }     [datamember]     public double warninglevel { get; set; }     [datamember]     public double currentlevel { get; set; }     [datamember]     public bool orderfuel { get; set; } }  [datacontract] public class costoffuel {     [datamember]     public double dieselsupplierprice { get; set; }     [datamember]     public double dieselprice { get; set; }     [datamember]     public double unleadedsupplierprice { get; set; }     [datamember]     public double unleadedprice { get; set; } }  [datacontract] public class sale {     [datamember]     public double value { get; set; }     [datamember]     public double volumesold { get; set; }     [datamember]     public datetime datesold { get; set; } }  [datacontract] public class ordered {     [datamember]     public double volume { get; set; }     [datamember]     public double cost { get; set; } }

but pumpclass, dieseltank , unleadedtank can seen service uses interface , don't know why. these 3 show in data sources visual studio well.


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