Sending values as parameters to .net core web api

In my api application, I send parameters via "controller" as follows.

For example; I am sending fields like "companyId", "userName" as parameters. But I don't always send "userName" field or "companyId" field full. So it can happen when I send it empty. I want it to fetch with "like" when I send it blank. can i do this?

 public async Task<List<Inventory>> GetInventoryList(int companyId, string userName, int page, int pageSize)
    {
        IQueryable<Inventory> query;
        query = _context.Inventories
               .Where(x => x.CompanyId == companyId)
               .OrderByDescending(x => x.CreatedDate);

        int totalCount = query.Count();

        var response = await query.Skip((pageSize * (page - 1)))
            .Take(pageSize)
            .Select(x => new Inventory()
            {
                CompanyId = x.CompanyId,


                CreatedDate = x.CreatedDate,
                Barcode = x.Barcode,
                BrandId = x.BrandId,
                BusinessCode = x.BusinessCode,
                CategoryId = x.CategoryId,
                CategorySubId = x.CategorySubId,
                Id = x.Id,
                Imei = x.Imei,
                InventoryDate = x.InventoryDate,
                InvoiceDate = x.InvoiceDate,
                Mac = x.Mac,
                ModelId = x.ModelId,
                Name = x.Name,
                SerialNumber = x.SerialNumber,
                Status = x.Status,
                Responsible = x.Responsible,
                TotalCount = totalCount,
                UpdatedDate = x.UpdatedDate
            }).ToListAsync();
        return response;
    }