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How do I create properties in a model class that are derived from other values in that class?

Posted on 2015-02-20
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Last Modified: 2015-02-20
I have a ViewModel that contains two entities as shown below:

public class ClientMaxActivityViewModel
    {
        public Client clientData { get; set; }
        public Activity activityData { get; set; }

    }

I want to create a property in this model that is dependent on the values of properties in both the Client and Activity entities.   It would be a string with a value of either 'Compliant' or 'Non-compliant'. Here is some pseudo-code for the logic (I  know the syntax is all wrong, but hopefully the principal is evident):

public string Compliant
{
      if(Client.VisitFrequency == "Monthly" && DateDiff(Activity.ActivityDate - Date(Now)) > 31)
           { return "Non-compliant"
             else
          return "Compliant"}
}

Thanks.
0
Comment
Question by:MinirvaTwo
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2 Comments
 
LVL 34

Accepted Solution

by:
it_saige earned 2000 total points
ID: 40621791
If you will be using this property in any decision logic, may I recommend using a boolean property instead:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EE_Q28621250
{
	class Program
	{
		static void Main(string[] args)
		{
			ClientMaxActivityViewModel model = new ClientMaxActivityViewModel() { clientData = new Client() { VisitFrequency = VisitFrequency.Monthly }, activityData = new Activity() { ActivityDate = DateTime.Now.AddMonths(1) } };
			Console.WriteLine("Is model compliant for Activity Date of {0} - {1}", model.activityData.ActivityDate.ToString("MM/dd/yyyy"), model.IsCompliant);
			model.activityData.ActivityDate = DateTime.Now.AddMonths(-1);
			Console.WriteLine("Is model compliant for Activity Date of {0} - {1}", model.activityData.ActivityDate.ToString("MM/dd/yyyy"), model.IsCompliant);
			Console.ReadLine();
		}
	}

	class ClientMaxActivityViewModel
	{
		public Client clientData { get; set; }
		public Activity activityData { get; set; }
		public bool IsCompliant
		{
			get 
			{
				if (clientData != null && activityData != null)
				{
					switch (clientData.VisitFrequency)
					{
						case VisitFrequency.Daily:
							return activityData.ActivityDate.AddDays(1) > DateTime.Now;
						case VisitFrequency.Weekly:
							return activityData.ActivityDate.AddDays(7) > DateTime.Now;
						case VisitFrequency.Monthly:
							return activityData.ActivityDate.AddMonths(1) > DateTime.Now;
						case VisitFrequency.Annually:
							return activityData.ActivityDate.AddYears(1) > DateTime.Now;
						case VisitFrequency.None:
						default:
							return false;
					}
				}
				return false;
			}
		}
	}

	class Client
	{
		public VisitFrequency VisitFrequency { get; set; }
	}

	class Activity
	{
		public DateTime ActivityDate { get; set; }
	}

	enum VisitFrequency
	{
		None = 0,
		Daily = 1,
		Weekly = 2,
		Monthly = 3,
		Annually = 4
	}
}

Open in new window

-saige-
0
 

Author Closing Comment

by:MinirvaTwo
ID: 40622001
Thanks it_saige!  You rock!  Worked perfectly.  I used text values in my switch/case statements instead of the enums, but it all worked great.  I could reference all of the properties of the ViewModel in the View, as shown below:

<td>
            @Html.DisplayFor(modelItem => item.clientData.Status)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.activityData.ActivityDate)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.IsCompliant)
        </td>

Thanks!
0

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