C# 为什么形式不是';是否在asp.net mvc中保存select中的值?
我有一个asp.NETMVC4项目,在razor视图中我有订单列表,每个订单都是带有值和选择输入的表单。当我尝试保存实体时,我的值输入已成功保存,但select不发送所选值,仅为null 查看C# 为什么形式不是';是否在asp.net mvc中保存select中的值?,c#,asp.net,asp.net-mvc,asp.net-mvc-4,razor,C#,Asp.net,Asp.net Mvc,Asp.net Mvc 4,Razor,我有一个asp.NETMVC4项目,在razor视图中我有订单列表,每个订单都是带有值和选择输入的表单。当我尝试保存实体时,我的值输入已成功保存,但select不发送所选值,仅为null 查看 @{ ViewBag.Title = ""; Layout = "~/Views/Shared/_Layout.cshtml"; var cityRepo = new Repository<City>(); var listItemsCities = cityR
@{
ViewBag.Title = "";
Layout = "~/Views/Shared/_Layout.cshtml";
var cityRepo = new Repository<City>();
var listItemsCities = cityRepo.GetAll().Select(city => new ListItem() {
Value = city.Id.ToString(),
Text = city.Value
}).ToList();
}
@foreach (var order in Model) {
<tr>
@using (Html.BeginForm("UpdateDispatcherFromForm", "Home", FormMethod.Post)) {
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<td>
@Html.HiddenFor(x => order.Id)
</td>
<td>
@Html.DropDownList("CityId", new SelectList(listItemsCities, "Value", "Text", order.CityId), "")
@*@if (order.City != null) {
@order.City.Value
}*@
</td>
<td>
@Html.EditorFor(x => order.Address)
@*@order.Address*@
</td>
<td>
<input type="submit" value="Save" />
</td>
}
</tr>
}
请改用DropDownListFor方法: 根据评论中的问题进行编辑 以下是为您修改的代码:
ViewBag.Title = "";
Layout = "~/Views/Shared/_Layout.cshtml";
var cityRepo = new Repository<City>();
var listItemsCities = cityRepo.GetAll().Select(city => new ListItem() {
Value = city.Id.ToString(),
Text = city.Value
}).ToList();
}
@foreach (var order in Model) {
<tr>
@using (Html.BeginForm("UpdateDispatcherFromForm", "Home", FormMethod.Post)) {
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<td>
@Html.HiddenFor(x => order.Id)
</td>
<td>
@Html.DropDownListFor(m=>m.CityId, new SelectList(listItemsCities, "Value", "Text", order.CityId), "")
@*@if (order.City != null) {
@order.City.Value
}*@
</td>
<td>
@Html.EditorFor(x => order.Address)
@*@order.Address*@
</td>
<td>
<input type="submit" value="Save" />
</td>
}
</tr>
}
ViewBag.Title=”“;
Layout=“~/Views/Shared/_Layout.cshtml”;
var cityRepo=new Repository();
var listItemsCities=cityRepo.GetAll().Select(city=>newlistItem()){
Value=city.Id.ToString(),
Text=city.Value
}).ToList();
}
@foreach(模型中的var顺序){
@使用(Html.BeginForm(“UpdateDispatcherFromForm”,“Home”,FormMethod.Post)){
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
@Html.HiddenFor(x=>order.Id)
@DropDownListFor(m=>m.CityId,新的选择列表(listItemsCities,“Value”,“Text”,order.CityId),“”)
@*@如果(order.City!=null){
@秩序、城市、价值
}*@
@EditorFor(x=>order.Address)
@*@订单,地址*@
}
}
您要做的是将所选内容绑定到您的模型。因此,您应该改用DropDownListFor方法
要做到这一点,你应该改变路线
@Html.DropDownList("CityId", new SelectList(listItemsCities, "Value", "Text", order.CityId), "")
对此
@Html.DropDownListFor(m=>m.CityId, new SelectList(listItemsCities, "Value", "Text", order.CityId), "")
看到这一点,这也是解决方案的一个很好的实现
@Html.DropDownListFor(m=>m.CityId, new SelectList(listItemsCities, "Value", "Text", order.CityId), "")