如何验证视图中的项目列表（类对象） [英] How To Validate list of items(class objects) in a view

问题描述

我的视图看起来像

My View looks like

@model List<MusicBusinessLayer.Music>
@using (Html.BeginForm("Create", "Home", FormMethod.Post, new { }))
{
    @Html.ValidationSummary(true)
 
    <fieldset>
        <legend>Music</legend>
 
 
 @for (int i = 0; i < Model.Count();i++ )
        {
        
        <div style="float:left;">
         <div class="editor-label">
        @Html.LabelFor(model => Model[i].Music_Id)
      </div>
      <div class="editor-field">
        @Html.EditorFor(model => Model[i].Music_Id)
       @Html.ValidationMessageFor(model => Model[i].Music_Id)
       </div>
 
        <pre><div class="editor-label">
        @Html.LabelFor(model => Model[i].Song_Name)
          </div>
         <div class="editor-field">
           @Html.EditorFor(model => Model[i].Song_Name)
         @Html.ValidationMessageFor(model => Model[i].Song_Name)
         </div>
 
            <div class="editor-label">
         @Html.LabelFor(model => Model[i].Music_Director)
         </div>
          <div class="editor-field">
          @Html.EditorFor(model => Model[i].Music_Director)
          @Html.ValidationMessageFor(model => Model[i].Music_Director)
           </div>
 }
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
            
}

我的Music.Class如下所示

And My Music.Class is show below

public class Music
    {
        [Required]
        public int Music_Id{ get; set; }
        [Required]
        public string  Song_Name { get; set; }
        [Required]
        public string Music_Director { get; set; }

}

如何验证此音乐文件列表controller.Thanks提前阅读问题

How to validate this list of music files in controller.Thanks in advance for reading the question

推荐答案

检查以下内容是否在控制器中提供了足够的信息？

Does checking for the following provide enough information in your controller?

if (ModelState.IsValid)
{
    // Continue process
}
else
{
    // Handle errors
}

跟进以前的帖子，可能值得考虑拆分视图并创建操作。



查看您的原始帖子，很难看到您可能想要一次添加多个项目的场景（应用程序将如何知道您想要的项目数量）添加？）。



从模型类开始..

Following up on the previous posts, it might be worth thinking about splitting the view and create actions up.

Looking at your original post, it's difficult to see a scenario where you might want to add many items at once (how would the application know how many items you wanted to add?).

So starting with your model class..

namespace Sample.Models
{
    using System.ComponentModel.DataAnnotations;

    /// <summary>
    /// The Music class.
    /// </summary>
    public class Music
    {
        [Required]
        public int Music_Id { get; set; }

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

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

..添加两个视图;索引（显示存储在数据源中的当前音乐文件列表）：

..add in two views; Index (to display the current list of music files stored in your data source):

@model List<sample.models.music>

<h1>Music</h1>

<table>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @item.Music_Id
            </td>
            <td>
                @item.Song_Name
            </td>
            <td>
                @item.Music_Director
            </td>
        </tr>
    }
</table>

@Html.ActionLink("Add", "Create")

。 .and Create（允许定义新的音乐文件）：

..and Create (to allow a new music file to be defined):

@model Sample.Models.Music

@using (Html.BeginForm("Create", "Home", FormMethod.Post, new { }))
{
    @Html.ValidationSummary(true)
 
    <fieldset>
        <legend>Music</legend>
        <div class="editor-label">
            @Html.LabelFor(model => Model.Music_Id)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => Model.Music_Id)
            @Html.ValidationMessageFor(model => Model.Music_Id)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => Model.Song_Name)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => Model.Song_Name)
            @Html.ValidationMessageFor(model => Model.Song_Name)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => Model.Music_Director)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => Model.Music_Director)
            @Html.ValidationMessageFor(model => Model.Music_Director)
        </div>
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

然后最后更新您的控制器以处理相应的操作：

Then finally update your controller to handle the appropriate actions:

namespace Sample.Controllers
{
    using System.Collections.Generic;
    using System.Web.Mvc;
    using Sample.Models;

    /// <summary>
    /// The HomeController class.
    /// </summary>
    public class HomeController : Controller
    {
        /// <summary>
        /// Performs the Index action.
        /// </summary>
        /// <returns>The Index view with data.</returns>
        public ActionResult Index()
        {
            return View(GetData());
        }

        /// <summary>
        /// Performs the Create (GET) action.
        /// </summary>
        /// <returns>The Create view with initial data.</returns>
        [HttpGet]
        public ActionResult Create()
        {
            return View(new Music());
        }

        /// <summary>
        /// Performs the Create (POST) action.
        /// </summary>
        /// <returns>The Create view with validation information, or a redirect back to the Index view.</returns>
        [HttpPost]
        public ActionResult Create(Music model)
        {
            if (ModelState.IsValid)
            {
                AddItem(model);
                return RedirectToAction("Index");
            }

            return View(model);
        }

        /// <summary>
        /// Gets the simulated data source items.
        /// </summary>
        /// <returns>The simulated data source items.</returns>
        private List<music> GetData()
        {
            if (Session["data"] == null)
            {
                Session["data"] = new List<music>();
            }

            return (List<music>)Session["data"];
        }

        /// <summary>
        /// Adds a new item to the simulated data source.
        /// </summary>
        /// <param name="item">The item to add.</param>
        private void AddItem(Music item)
        {
            var data = GetData();
            data.Add(item);
            Session["data"] = data;
        }
    }
}

请注意，在我给出的示例中，我只是创建一个模拟数据源一个会话变量。



如果你真的想一次添加多个项目，你可以修改创建操作，只需在数据源中添加一个空白项目并更改添加POST索引操作，用于执行数据更新。如果您正在寻找，请告诉我，我会在此处发布该解决方案。

Note that in the example I've given, I'm just creating a simulated data source as a Session variable.

If you really wanted to add multiple items at once, you could modify the Create action to just add a blank item to your data source and change add a POST Index action to perform an Update on the data instead. Let me know if that's what you're looking for and I'll post that solution here.

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