I have the following classes:

public class EquipmentListFilter
{
    public string ColumnName { get; set; }
    public string Keyword { get; set; }
    public string Operand { get; set; }
    public string FilterType { get; set; }
}

public class EquipmentFilterPack
{
    public string[] ColumnNames { get; set; }
    public string[] keywords { get; set; }
    public string[] FilterTypes { get; set; }
    public string[] Operands { get; set; }
}

I get the EquipmentFilterPack object as input in my API. I have to map EquipmentFilterPack to a list of EquipmentListFilter. The final result should be List<EquipmentListFilter>.

For example:

[
    {
        ColumnName = "C1",
        Keyword = "kw1",
        Operand = "AND",
        FilterType = "ٍIS"
    },
    {
        ColumnName = "C2",
        Keyword = "kw2",
        Operand = "AND",
        FilterType = "ٍIS NOT"
    },
    ...
]

A similar thread is here.

How can I create the final list? Is there any LINQ solution?

CodePudding user response：

As clarified that those four properties arrays have the exact same length, the easiest way is you can use a for loop to iterate and get the element by an index that has been covered in the comment.

Another approach will be performing CROSS JOIN via LINQ:

Query expression

List<EquipmentListFilter> filters = (from a in pack.ColumnNames
                   from b in pack.keywords
                   from c in pack.FilterTypes
                   from d in pack.Operands
                   select new EquipmentListFilter
                    {
                        ColumnName = a,
                        Keyword = b,
                        FilterType = c,
                        Operand = d,
                    }).ToList();

Demo @ .NET Fiddle

CodePudding user response：

There are nuget packages that can help you like imapper and newtonsoft.

If you do it yourself, you would have to:

1. Build a for loop.
2. Get the biggest length from the array properties' of EquipmentFilterPack.
3. Use the 'Length' as the iteration count to iterate over the properties.
4. Guard yourself from indexoutofbound exception by not continuing iterating over arrays with smaller lengths than the current iterating index.
5. Create EquipmentListFilterList that will be outside the for loop, (List).
6. Create EquipmentListFilter object in every iteration and feed its properties from the EquipmentFilterPack properties.
7. Add every newly created EquipmentListFilter to EquipmentListFilterList.

A LINQ solution is also viable, although it would be more convoluted.