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Ticket Q471259
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Session.Evaluate problems

created 12 years ago

Hi all!!! I have department and contact classes! Every contact has appropriate department_number. I want to add number of my new contact from MAX + 1. And I try to do this:

C#
private Int32 _MaxRate;  
public Int32 MaxRate  
{  
  get  
  {  
      try  
      {  
          _MaxRate = (Int32)Session.Evaluate<Contact>(new AggregateOperand("", "Number", Aggregate.Max), CriteriaOperator.Parse("Department.NumberOfDepartment = 'this.NumberOfdepartment'"));  
      }  
      catch (Exception)  
      {  
      }  
    return _MaxRate;  
  }

}

I want to fined MAX number of my contact from current department! First it mast filter by department and then fined MAX from current! But my code working wrong! Where I have mistake?

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Answers approved by DevExpress Support

created 12 years ago (modified 12 years ago)

Hello Sergey,
The problem occurs because of the "'this.NumberOfdepartment'" parameter. The Evaluate method cannot process such parameters. Instead of this, pass the value of the NumberOfdepartment property to the criteria operator, as shown below:

C#
object result = Session.Evaluate<Contact>(new AggregateOperand("", "Number", Aggregate.Max), CriteriaOperator.Parse("Department.NumberOfDepartment = ?", this.NumberOfdepartment));  
if (result != null) {  
    return (Int32)result;  
} else {  
    return 0;  
}
    Comments (2)
    SA SA
    Sergey Aleksandrov 12 years ago

      Thanks!!!

      Anatol (DevExpress) 12 years ago

        You are welcome!

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