cshtml頁面：

1 <wt:combobox field="Entity.ServicenameCodeID" items="AllServicenameCodes" link-field="@Model.AllshippingmethodsID" trigger-url="/ChannelApiInfor/GetServicenameIDByshippingmethod" />
2         <wt:combobox field="@Model.AllshippingmethodsID" items="Allshippingmethods" multi-select="true"
 
 />

控制器方法：

1 [ActionDescription("級聯")]
2         public IActionResult GetServicenameIDByshippingmethod(Guid id)
3         {
4            var vm= DC.Set<ShippingMethod>().Where(c => c.ServicenameCodeID == id).Select(m=> new { Text=m.cnname,Value=m.ID}).ToList();
5             
6             return
 
 Json(vm);
7         }

另外可以參照一下圖片：

WTM_LayUI 二級聯動