When

The When method allows conditional mapping: a destination property is mapped only if the condition returns true.

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✅ Example 1: Map only if status is active

.When(dest => dest.IsActive, src => src.Status == "ACTIVE")

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✅ Example 2: Skip if value is null or empty

.When(dest => dest.Description, src => !string.IsNullOrEmpty(src.Description))

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✅ Example 3: Apply condition on numeric fields

.When(dest => dest.Discount, src => src.Discount > 0)