CODEWITHSUNDEEP
c#genericstypes
Prakash
Prakash

Reputation: 23

How to convert T to particular object

I want to retrieve BalanceAmount from particular Class. How do i do

public class SettlePendingAmount<T> : Form
{
        public T Activity { private get; set; }
        private void Initialize()
        {
            var bal = 0
            if (Activity is Invoice)
            {
                bal = ((Invoice)Activity).BalanceAmount;
            }
            if (Activity is Purchase)
            {
                bal = ((Purchase)Activity).BalanceAmount;
            }
      }
}

Upvotes: 0

Views: 100

Answers (1)

ProgrammingLlama
ProgrammingLlama

Reputation: 38737

I expect you want to use an interface:

public interface IBalance
{
    // I inferred int from your var bal = 0;
    // if that's incorrect, feel free to change it
    int BalanceAmount { get; }
}

Now we'll add a generic constraint on T:

public class SettlePendingAmount<T> : Form
    where T: IBalance

We'll also need to add this interface to Invoice and Purchase:

public class Invoice : IBalance
{
    public int BalanceAmount { get; } // or get; set; (whatever you currently have)
}

public class Purchase : IBalance
{
    public int BalanceAmount { get; } // or get; set; (whatever you currently have)
}

Then we can freely access BalanceAmount:

public class SettlePendingAmount<T> : Form
    where T : IBalance
{
    public T Activity { private get; set; }
    
    private void Initialize()
    {
        var bal = Activity.BalanceAmount;
    }
}

The downside here is that your SettlePendingAmount class can only be constructed for types that implement this interface. From the brief outline of what you're doing, I suspect this is OK.

Upvotes: 1

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