metro metro - 2 months ago 20
C# Question

How to get dynamic type property?

I have a project that I should place some code in other layer and because of this I should transfer a linq query to method.
This code:

var HRPersonnelContactInfoTelService = App.Api.HRPersonnelContactInfoTelService.Instance().Data();
var SMSGroupMemberService = App.Api.SMSGroupMemberService.Instance().Data();
return (from x in SMSGroupMemberService
where Recivers.Contains(x.GroupID)
join v in HRPersonnelContactInfoTelService on x.Pers_Code equals v.Pers_Code
select new { Pers_Code = (int)x.Pers_Code, Tel = v.Tel }).ToList();


I converted up code to:

public dynamic HRPersonnelContactInfoTelMethod(List<int> Recivers)
{
var HRPersonnelContactInfoTelService = App.Api.HRPersonnelContactInfoTelService.Instance().Data();
var SMSGroupMemberService = App.Api.SMSGroupMemberService.Instance().Data();
return (from x in SMSGroupMemberService
where Recivers.Contains(x.GroupID)
join v in HRPersonnelContactInfoTelService on x.Pers_Code equals v.Pers_Code
select new { Pers_Code = (int)x.Pers_Code, Tel = v.Tel }).ToList();
}


but when I use it in foreach


An exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in System.Core.dll but was not handled in user code

Additional information: 'object' does not contain a definition for 'Pers_Code'


Use it like this:

var q = App.Api.HRPersonnelContactInfoTelService.Instance().HRPersonnelContactInfoTelMethod(Recivers);
foreach (var item in Recivers)
{
var res = App.Api.SMSMessageGroupService.Instance().AddOrUpdate(null, MessageId, item);
}
foreach (var z in q)
{
string SendNumber = Number[1].Trim().Substring(0, 3) == "+98" ? Number[1].Trim() : "+98" + Number[1].Trim();
var res = App.Api.SMSMessageLogService.Instance().AddOrUpdate(null, MessageId, (int)z.Pers_Code, z.Tel.ToString(),
0, int.Parse(ddlSMSWorkingGroups.SelectedValue.ToString()), (int)z.Pers_Code, SendNumber, 0);
send.SendSMS("nazmaran", "qwerty", SendNumber, "09122596898", txtPredefinedRemarks.Text);
}

Answer

I would never use dynamic to return the result of a linq query that uses anonymous types to project the results. Instead, I would create a class that holds the results:

public class SomeName
{
   public int Pers_Code { set; get; }
   public string /* Change to Correct Type */ Tel { set; get;}
}

Usage:

public List<SomeName> HRPersonnelContactInfoTelMethod(List<int> Recivers)
{
   var HRPersonnelContactInfoTelService = App.Api.HRPersonnelContactInfoTelService.Instance().Data();
   var SMSGroupMemberService = App.Api.SMSGroupMemberService.Instance().Data();
   return (from x in SMSGroupMemberService
           where Recivers.Contains(x.GroupID)
           join v in HRPersonnelContactInfoTelService on x.Pers_Code equals v.Pers_Code
           select new SomeName() { Pers_Code = (int)x.Pers_Code, Tel = v.Tel }).ToList();
}

Creating a type to hold the results is nothing compared to the complexity of used dynamic.

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