How to add List<int> to a DataContract of a web service -

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i want create datacontract class 2 different list members. when try start web service, error method, sendemail, not supported test wcf client. data contract:

 [datacontract] [knowntype(typeof(int[]))] public class emailinfo {     private string strfromuserid = string.empty;     private string strfromaddress = string.empty;     private string strfromname = string.empty;     private object lstindividualids = null;     private object lstgroupids = null;     private string strsubject = string.empty;     private string strmessage = string.empty;      [datamember]     public string fromuserid     {         { return strfromuserid; }         set { strfromuserid = value; }     }      [datamember]     public string fromaddress     {         { return strfromaddress; }         set { strfromaddress = value; }     }      [datamember]     public string fromname     {         { return strfromname; }         set { strfromname = value; }     }      [datamember]     public object individualids     {         { return lstindividualids; }         set { lstindividualids = value; }     }      [datamember]     public object groupids     {         { return lstgroupids; }         set { lstgroupids = value; }     }      [datamember]     public string subject     {         { return strsubject; }         set { strsubject = value; }     }      [datamember]     public string message     {         { return strmessage; }         set { strmessage = value; }     } }

this method uses datacontract:

 public string sendemail(emailinfo emailinfo)     {         string tstrerrormsg = string.empty;         sqlconnection sqlconn = null;         try         {             return tstrerrormsg;         }         catch (exception ex)         {             return null;         }                 {             if (sqlconn != null)             {                 sqlconn.close();             }         }     }

i have datamember in datacontract of type list. how add type datacontract?

i got web service run changing lstindividualids , listgroupids list. thought had use objects. in case else has problem...

object lstindividualids -> list listindividualids same groupids. allowed test client run service..


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