c# - How to map two class properties based on Customer

Solution:

Basically, this depends on the Customer's mind.

So if you don't have any way to mapping yet.

you can divide your customers into 3 or 4 groups or more.

then you can use a factory design pattern
or simply can use an "if" statement depending on a new field "CustomerGroupId" and this should come with the entity to your code

Then:

if (Customer.CustomerGroupId == 1)
{
 // do mapping like Order.Note = shopify.Note
}
else if (Customer.CustomerGroupId == 1)
{
 // do mapping like Order.Customer.Note = shopify.Note
}
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Solution:

A very simple option is to use the "mapping info" within theOrder class, and then modify theOrderNote property to use the mapping for getting/setting the note.

For example, create a method that provides the mapping:

private string _map = "note"; // default value when SetMap is not used

public void SetMap(string map)
    => _map = map;
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And thenOrderNote becomes:

private string _note;

public string OrderNote { 
    get => GetNote();
    set => SetNote(value);
}

private string GetNote()
{
    if(_map == "note") return _note;
        
    if(_map == "Customer.Note") return Customer.Note;
    
    throw new ArgumentOutOfRangeException("Invalid _map");
}

private void SetNote(string value)
{
    if(_map == "note") { _note = value; return; }
        
    if(_map == "Customer.Note") { Customer.Note = value; return; }
    
    throw new ArgumentOutOfRangeException("Invalid _map");
}
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Use the same pattern for each type of mapping.