检查 ac# 列表中的某些项目是否相同

Question

I want to check if some items are same in a list based on a item present in the list.

List<ProductDetailDTO> productDTOs;

The ProductDetailDTO is -

public class ProductDetailDTO
{
    public int ProductId { get; set; }
    public string Name { get; set; }
    public string Category { get; set; }
    public byte[] Image { get; set; }
    public string Description { get; set; }
    public string Brand { get; set; }
    public string GUID { get; set; }
    public string VariantName { get; set; }
    public string VariantValue { get; set; }
    public decimal Price { get; set; }
}

Now, I want to display all VariantName and VariantValue with the same GUIDs together.

How can I achieve this?

Answer 1

try with this

productDTOs.GroupBy(x => x.GUID,(key,item) => new
            {
                VariantName= item.Select(y=>y.VariantName),
                VariantValue = item.Select(y => y.VariantValue),

            }).ToList()