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c# - 控制器从表单 ASP.NET MVC5 接收空值

问题描述

我有两个来自市场及其分支机构的下拉菜单，所以我在选择市场时做了它，它将其分支机构加载到分支机构下拉菜单中

html设计

<div style="width : 50%">
        <div class="form-group" style="display:inline-block">
            @Html.LabelFor(m => m.Market)
            @Html.DropDownListFor(m => m.Market, new SelectList(Model.Markets, "Id", "Name"), "Select Market", new { @class = "form-control" })
        </div>
        <div class="form-group" style="float:right">
            @Html.LabelFor(m => m.Branch)
            @Html.DropDownListFor(m => m.Branch, new SelectList("", "Id", "Name"), "Select Branch", new { @class = "form-control" })
        </div>
    </div>

以及加载分支的ajax

 $(function () {
    $("#Market").on("change", function () {
        $.get("/Home/GetBranches", { id: $("#Market").val() }, function (data) {
            $("#Branch").empty();
            console.log(data);
            $.each(data, function (index, row) {
                $("#Branch").append("<option value='" + row.Id + "'>" + row.Name + "</option>")
            });
        });
    });

一切正常，但是当我发布整个表格时

   @using (Html.BeginForm("Index", "Home", FormMethod.Post))
{

    <div style="width : 50%">
        <div class="form-group" style="display:inline-block">
            @Html.LabelFor(m => m.Market)
            @Html.DropDownListFor(m => m.Market, new SelectList(Model.Markets, "Id", "Name"), "Select Market", new { @class = "form-control" })
        </div>
        <div class="form-group" style="float:right">
            @Html.LabelFor(m => m.Branch)
            @Html.DropDownListFor(m => m.Branch, new SelectList("", "Id", "Name"), "Select Branch", new { @class = "form-control" })
        </div>
    </div>

    <input class='datepicker' />

    <div style="width: 50%">
        <div class="form-group" style="display:inline-block">
            @Html.LabelFor(m => m.Date)
            @Html.TextBoxFor((m => m.Date), new { @class = "form-control form-inline datepicker", placeholder = "eg 1 Jan 2018" })
            @Html.ValidationMessageFor(m => m.Date)
        </div>
        <div class="form-group" style="float:right">
            @Html.LabelFor(m => m.Time)
            @Html.TextBoxFor(m => m.Time, new { @class = "form-control form-inline", placeholder = "hh:mm" })
            @Html.ValidationMessageFor(m => m.Time)
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(m => m.CustName)
        @Html.TextBoxFor(m => m.CustName, new { @class = "form-control fouc" })
        @Html.ValidationMessageFor(m => m.CustName)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.OrderNumber)
        @Html.TextBoxFor(m => m.OrderNumber, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.OrderNumber)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Total)
        @Html.EditorFor(m => m.Total, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(m => m.Total)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.CouponValue)
        @Html.EditorFor(m => m.CouponValue, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(m => m.CouponValue)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Notes)
        @Html.TextBoxFor(m => m.Notes, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.Notes)
    </div>
    <button type="submit" class="btn btn-primary btn-lg">Save</button>

我收到分支空值 在此处输入图像描述

当我在浏览器中打开网络时，我可以看到传递的值 在此处输入图像描述

和模型类

    using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using Takers.Models;

namespace Takers.ViewModel
{
    public class OrderView
    {
        [Required]
        public string OrderNumber { get; set; }

        [Required]
        public string CustName { get; set; }

        [Required]
        public decimal CouponValue { get; set; }

        [Required]
        public string Notes { get; set; }

        [Required]
        public string UserName { get; set; }

        [Required]
        public decimal Total { get; set; }

        public string Time { get; set; }

        public string Date { get; set; }

        public Market Market { get; set; }

        public Branch Branch { get; set; }

        public ICollection<Market> Markets { get; set; }

        public ICollection<Branch> Branches { get; set; }

        public DateTime GetDateTime()
        {
            return DateTime.Parse($"{Date} {Time}");
        }
    }
}

在调试时我可以看到指向模型类的点并将分支设置为空值我很困惑谢谢

标签： c#asp.net-mvc-5

解决方案

Branch 是一个内置模型绑定器一无所知的类，您将不得不编写一个自定义模型绑定器，将 Branch 发布的值转换为Branch实例或将模型中的 Branch 转换为stringor int：

public string Branch { get; set; }

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