public async Task <IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return(Page());
            }

            var 往来单位 = _mapper.Map <tb_往来表>(供应商);

            _context.Attach(往来单位).State = EntityState.Modified;

            _context.funcEditRecord <vm_供应商, tb_往来表>(供应商, updating => {
                updating.类型 = "供应商";
            });

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!sys往来表Exists(供应商.RecordId))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(RedirectToPage("./Index"));
        }