Question

I have nested classes ie

Order

ID, (GUID = 8e6e48f7-9047-4e2a-95e7-ec4318641fbb)
Date
Orders -> List<OrderItem>

OrderItem

ID, (GUID= = 4582234b-d8b5-4665-b00f-e4f09ff3e2c6)
ProductId
Qty
Unit
Price
ID, (GUID= = b0d12322-e92c-42c6-b2b7-520db1d3a818)
ProductId
Qty
Unit
Price

Because I have nesting and I am using GUIDs as IDs for my objects, I am wondering whether there is a generic method to find an object given a GUID. One I have this object I could then remove it from it parent list.

By the way, I do realise that I could used specific lambda expression to get at the specific objects, but this would result in many expressions for many different scenarios, hence many interest in one generic approach.

Thanks,

Answer 1

I would probably create an interface that all of my classes (or base classes) would implement called IGuidSearchable or something like that. It would need to set two properties, the ID and a Children collection of List<ISearchable>. The implementing classes could either use this or would be responsible for setting this property to be equal to the property they use (like Orders -> List<OrderItem> in your example).

public static IGuidSearchable FindObjectByGuid(this IGuidSearchable source, System.Guid guid) 
{
    if (source.ID.Equals(guid)) 
    {
        return source;
    }
    foreach (ISearchable child in source.Children)
    {
        if (child.FindObjectByGuid(guid) != null)
            return child;            
    }   

    return null; // Fall through    
}