查看页面不会将我带回控制器

本文关键字：控制器 | 更新日期: 2023-09-27 18:19:36

我有如下代码。我希望当我点击"保存"按钮时，视图页面可以将我带回控制器[HttpPost]"ProductEdit"，但事实并非如此。任何能帮我的人都将不胜感激。请检查下面的视图和控制编码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Script.Serialization;
using MvcApplication1.Models;
using System.Data.Objects.SqlClient;
namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult ProductEdit(Int32 ProductId)
        {
            var northwind = new NorthwindEntities();
            var q = from p in northwind.Products
                    where p.ProductID == ProductId
                    select new ProductEditViewModel
                    {
                        ProductID = p.ProductID,
                        ProductName = p.ProductName,
                        UnitPrice = p.UnitPrice,
                        SupplierItems = from sup in northwind.Suppliers
                                        select new SelectListItem
                                            {
                                                Text = sup.CompanyName,
                                                Value = SqlFunctions.StringConvert((double)sup.SupplierID),
                                                Selected = sup.SupplierID == p.SupplierID
                                            },
                        CategorySelectedId = p.CategoryID,
                        CategorieItems = from cat in northwind.Categories select cat,
                        Discontinued = p.Discontinued
                    };
            return View(q.SingleOrDefault());
        }
        [HttpPost]
        public ActionResult ProductEdit()
        {
            var northwind = new NorthwindEntities();
            var vm = new ProductEditViewModel();
            UpdateModel<ProductEditViewModel>(vm);
            return View();
        }
    }
}

@model MvcApplication1.Models.ProductEditViewModel
@{
    Layout = null;
}
<script type="text/javascript">
</script>
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>ProductEdit</title>
</head>
<body>
    <script src="~/Scripts/jquery-1.10.2.min.js"></script>
    <script src="~/Scripts/jquery.validate.min.js"></script>
    <script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>

    @using (Html.BeginForm())
    {
        @Html.AntiForgeryToken()
        <div class="form-horizontal">
            <h4>Product</h4>
            <hr />
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })
            @Html.HiddenFor(model => model.ProductID)
            <div class="form-group">
                @Html.LabelFor(model => model.ProductName, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EditorFor(model => model.ProductName, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.ProductName, "", new { @class = "text-danger" })
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-offset-2 col-md-10">
                    <input type="submit" value="Save" class="btn btn-default" />
                </div>
            </div>
        </div>
    }
    <div>
        @Html.ActionLink("Back to List", "Index")
    </div>
</body>
</html>

查看页面不会将我带回控制器

正确使用Html.BeginForm可能会有所帮助：

Html.BeginForm（"ActionName"、"ControllerName"、方法）

示例：

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

问题（未从视图返回到[HttpPost]控制器）是由以下代码行引起的

Value = SqlFunctions.StringConvert((double)sup.SupplierID),

所以修正码是：

[HttpGet]
public ActionResult ProductEdit(Int32 ProductId)
{
    var northwind = new NorthwindEntities();
    var q = from p in northwind.Products.AsEnumerable()  //to enumerate all records in memory and then use ToString
            where p.ProductID == ProductId
            select new ProductEditViewModel
            {
                Product = p,
                SupplierItems = from sup in northwind.Suppliers.AsEnumerable()  //to enumerate all records in memory and then use ToString
                                select new SelectListItem
                                    {
                                        Text = sup.CompanyName,
                                        Value = sup.SupplierID.ToString(),  //to enumerate all records in memory and then use ToString
                                        Selected = sup.SupplierID == p.SupplierID
                                    },
                CategorySelectedId = p.CategoryID,
                CategorieItems = from cat in northwind.Categories.AsEnumerable() select cat,  //to enumerate all records in memory and then use ToString
            };
    return View(q.SingleOrDefault());
}
[HttpPost]
public ActionResult ProductEdit(ProductEditViewModel vm)
{
    return View();
}

public class ProductEditViewModel
{
    public Product Product;
    // For DropDownListFor need IEnumerable<SelectListItem>
    public IEnumerable<SelectListItem> SupplierItems { get; set; }
    // For RadioButtonFor need below
    public Int32? CategorySelectedId { get; set; }
    public IEnumerable<Category> CategorieItems { get; set; }
}

<div class="form-group">
    @Html.LabelFor(model => model.Product.SupplierID, "SupplierID", htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @*DropDownList is for deiplay purpose*@
        @*@Html.DropDownList("SupplierID", Model.SupplierItems, htmlAttributes: new { @class = "form-control" })*@
        @*DropDownListFor is for Edit purpose*@
        @Html.DropDownListFor(model => model.Product.SupplierID, Model.SupplierItems, htmlAttributes: new { @class = "form-control" })
    </div>
</div>
<div class="form-group">
    @Html.LabelFor(model => model.Product.CategoryID, "CategoryID", htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @*RadioButton is for Display purpose*@
        @*@foreach (var Categorie in Model.CategorieItems)
            {
                @Html.RadioButton("CategoryID", Categorie.CategoryID, Model.CategorySelectedId == Categorie.CategoryID) @Categorie.CategoryName; @:&nbsp;&nbsp;&nbsp;
            }*@
        @*RadioButtonFor is for Edit purpose*@
        @foreach (var Categorie in Model.CategorieItems)
        {
            @Html.RadioButtonFor(model => model.CategorySelectedId, Categorie.CategoryID) @Categorie.CategoryName; @:&nbsp;&nbsp;&nbsp;
        }
    </div>
</div>
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