Asp.net mvc 如何保存对数据库所做的更改

我有以下编辑操作

在视图中，我有以下代码

<form asp-action="Edit" class="form-horizontal">
   <input type="text" asp-for="Code" value="@Model.Code" class="form-control" />
   <button class="btn btn-success Product-edit-button" role="button">Save</button>
</form>

如何在单击按钮时保存对数据库的更改

这是我试过的，编辑模型的样子

public async Task<IActionResult> editModel(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var ProductList = (await ProductService.GetProducts()).ToList();

            var Product = ProductList.FirstOrDefault(a => a.ID == id);

            if (Product == null)
            {
                return NotFound();
            }

            return View(Product);
        }

编辑操作如下所示

        public async Task<IActionResult> Edit(ProductEditModel editModel)
        {
            if (id == null)
            {
                return NotFound();
            }
            var ProductList = (await ProductService.GetProducts()).ToList();
            var Product = ProductList.FirstOrDefault(a => a.ID == id);
            if (Product == null)
            {
                return NotFound();
            }
            Product.Code = editModel.Code;
            ProductService.EditProduct(Product);

            return View(Product);
        }

---

您需要另一个接受POST请求并向其发送编辑数据的操作

public async Task<IActionResult> Edit(ProductEditModel editModel)
        {
            if (id == null)
            {
                return NotFound();
            }    
            var ProductList = (await ProductService.GetProducts()).ToList();    
            var Product = ProductList.FirstOrDefault(a => a.ID ==editModel.Id);    
            if (Product == null)
            {
                return NotFound();
            }  
          Product.Code=editModel.Code;
          ProductService.EditProduct(Product);

            return View(Product);
        }

观点：

拯救

---

下面是一个工作演示，如下所示：

1.型号：

public class ProductEditModel
{
    public int ID { get; set; }
    public string Code { get; set; }
}

2.ViewEdit.cshtml：

@model ProductEditModel
<h4>ProductEditModel</h4>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Edit">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="ID" />
            <div class="form-group">
                <label asp-for="Code" class="control-label"></label>
                <input asp-for="Code" class="form-control" />
                <span asp-validation-for="Code" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Save" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

3.控制员：

public class ProductEditModelsController : Controller
{
    private readonly YourContext _context;

    public ProductEditModelsController(YourContext context)
    {
        _context = context;
    }
    // GET: ProductEditModels/Edit/5
    //display edit view
    public async Task<IActionResult> Edit(int? id)
    {
        if (id == null)
        {
            return NotFound();
        }

        var productEditModel = await _context.ProductEditModel.FindAsync(id);
        if (productEditModel == null)
        {
            return NotFound();
        }
        return View(productEditModel);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(ProductEditModel productEditModel)
    {
        if (ModelState.IsValid)
        {
            _context.Update(productEditModel);//update model
            await _context.SaveChangesAsync();//save to database
            return RedirectToAction(nameof(Index));
        }
        return View(productEditModel);
    }
}

public async Task<IActionResult> Index()
{
    return View(await _context.ProductEditModel.ToListAsync());
}

4.1背景：

public class YourContext: DbContext
{
    public YourContext(DbContextOptions<YourContext> options)
        : base(options)
    {
    }
    public DbSet<ProductEditModel> ProductEditModel { get; set; }
}

5.Startup.cs：

public void ConfigureServices(IServiceCollection services)
{     
    //...  
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    services.AddDbContext<YourContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("YourConnnection"))); //connect to sql server
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
   //...      
    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Privacy}/{id?}");
    });
}

结果: 更新：

1.Index.cshtml：

@model IEnumerable<ProductEditModel>

@{
    ViewData["Title"] = "Index";
}

<h1>Index</h1>

<p>
    <a asp-action="Create">Create New</a>
</p>
<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.Code)
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
@foreach (var item in Model) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Code)
            </td>
            <td>
                <a asp-action="Edit" asp-route-id="@item.ID">Edit</a> |
                <a asp-action="Details" asp-route-id="@item.ID">Details</a> |
                <a asp-action="Delete" asp-route-id="@item.ID">Delete</a>
            </td>
        </tr>
}
    </tbody>
</table>

2.控制器中的索引操作：

public class ProductEditModelsController : Controller
{
    private readonly YourContext _context;

    public ProductEditModelsController(YourContext context)
    {
        _context = context;
    }
    // GET: ProductEditModels/Edit/5
    //display edit view
    public async Task<IActionResult> Edit(int? id)
    {
        if (id == null)
        {
            return NotFound();
        }

        var productEditModel = await _context.ProductEditModel.FindAsync(id);
        if (productEditModel == null)
        {
            return NotFound();
        }
        return View(productEditModel);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(ProductEditModel productEditModel)
    {
        if (ModelState.IsValid)
        {
            _context.Update(productEditModel);//update model
            await _context.SaveChangesAsync();//save to database
            return RedirectToAction(nameof(Index));
        }
        return View(productEditModel);
    }
}

public async Task<IActionResult> Index()
{
    return View(await _context.ProductEditModel.ToListAsync());
}

如果您未能成功理解，请先学习下面的mvc教程

参考：

---

谢谢，我如何传递id，这一行给我的错误id在当前上下文中不存在var Project=ProjectList.FirstOrDefaulta=>a.id==id；？什么是ProductService.EditProductProduct；还有ProjectEditModelMike你能告诉我ProjectEditModel动作是什么样子吗？抱歉，我有点困惑ProjectEditModel是一个类。我认为令人困惑的是在控制器中创建一个新动作。我将在几分钟内更新代码。谢谢迈克，我想看看其他操作的效果。我想看到你更新问题。这是正确的。只需将editModel操作重命名为Edit。实际上，我共享了代码。您的意思是您想要CRUD的全部代码吗？您好，请检查我的答案。如果仍然存在问题，请先学习mvc教程：