Oli Sturm
34 lines
1.1 KiB
C#
34 lines
1.1 KiB
C#
namespace CsharpFp1.Domain;
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/// Value object used to represent money and enforce simple invariants.
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/// Note that this implementation uses immutable patterns for the data
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/// by returning a new instance for each modification. This is an early
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/// recommendation for DDD with OO, but not necessarily the common practice
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/// in many real-world implementations.
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public sealed class Money
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{
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// Potentially with a setter - see note above
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public decimal Amount { get; }
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public Money(decimal amount)
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{
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Amount = amount;
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}
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// In many existing DDD/OO codebases you may actually see the use
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// of mutable value types.
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//
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// public void Add(Money other)
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// {
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// this.Amount += other.Amount;
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// }
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// On the other hand, sometimes these helpers may be left out
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// and operations encoded directly "from the outside":
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// newBalance = new Money(oldBalance.Amount - charge.Amount)
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//
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public Money Add(Money other) => new(Amount + other.Amount);
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public Money Subtract(Money other) => new(Amount - other.Amount);
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}
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