Question

我正在ASP.NET Core MVC中创建一个基本的CRUD应用程序，允许用户与许多电视频道进行交互。当用户点击＆＃34;编辑＆＃34;按钮用于特定频道，此代码运行：

<a asp-action="Edit" asp-route-id="@Html.Raw(channel.ID)">Edit</a>

接下来，用户将被带到＆＃34;编辑＆＃34;视图。此视图包含具有每个可编辑属性的表单。以下是＆＃34;描述＆＃34;的示例。字段：

<div class="form-group">
    <label asp-for="Desc" class="col-md-2 control-label"></label>
    <div class="col-md-10">
        <input asp-for="Desc" class="form-control"/>
        <span asp-validation-for="Desc" class="text-danger"></span>
    </div>
</div>

此字段应包含现有描述，以便用户不必记住它是什么。如何从＆＃34;索引＆＃34;中传递此信息？查看这个？

修改

根据请求，这是我的完整控制器：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.IO;
using Newtonsoft.Json;
using TV_Channel_Manager.Models;
using System.Text.RegularExpressions;

namespace TV_Channel_Manager.Controllers
{
    public class ChannelController : Controller
    {
        // GET: Channel
        public async Task<ActionResult> Index()
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri("http://localhost:57412/");
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes("Administrator:")));

                HttpResponseMessage response = await client.GetAsync("config/v1/project/channels");
                if (response.IsSuccessStatusCode)
                {
                    string responseStr = await response.Content.ReadAsStringAsync();
                    // change keys so that they match props, and convert to object
                    List<Channel> channels = JsonConvert.DeserializeObject<List<Channel>>(responseStr.Replace("PROJECT_ID", "ProjID").Replace("common.ALLTYPES_DESCRIPTION", "Desc").Replace("common.ALLTYPES_NAME", "Name").Replace("servermain.CHANNEL_DIAGNOSTICS_CAPTURE", "CaptureDiag").Replace("servermain.CHANNEL_NON_NORMALIZED_FLOATING_POINT_HANDLING", "NonNormalizedFloatHandling").Replace("servermain.CHANNEL_UNIQUE_ID", "ID").Replace("servermain.CHANNEL_WRITE_OPTIMIZATIONS_DUTY_CYCLE", "WriteOptimDutyCycle").Replace("servermain.CHANNEL_WRITE_OPTIMIZATIONS_METHOD", "WriteOptimMethod").Replace("servermain.MULTIPLE_TYPES_DEVICE_DRIVER", "Driver").Replace("simulator.CHANNEL_ITEM_PERSISTENCE", "ItemPersistence").Replace("simulator.CHANNEL_ITEM_PERSISTENCE_DATA_FILE", "ItemPersistenceFile"));
                ViewData["channels"] = channels; // pass object list to view
            }
        }

        return View();
    }

    // GET: Channel/Details/5
    public ActionResult Details(int id)
    {
        return View();
    }

    // GET: Channel/Create
    public ActionResult Create()
    {
        return View();
    }

    // POST: Channel/Create
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create(IFormCollection collection)
    {
        try
        {
            // TODO: Add insert logic here

            return RedirectToAction("Index");
        }
        catch
        {
            return View();
        }
    }

    // GET: Channel/Edit/5
    public ActionResult Edit(int id)
    {
        return View();
    }

    // POST: Channel/Edit/5
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Edit(long projID, string desc, string name, bool captureDiag, int nonNormalizedFloatHandling, long ID, int writeOptimDutyCycle, int writeOptimMethod, string driver, bool itemPersistence, string itemPersistenceFile)
    {
        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("http://localhost:57412/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes("Administrator:")));

            Channel newChannelObj = new Channel(projID, desc, name, captureDiag, nonNormalizedFloatHandling, ID, writeOptimDutyCycle, writeOptimMethod, driver, itemPersistence, itemPersistenceFile);
            // replace prop names with actual names
            string serialized = JsonConvert.SerializeObject(newChannelObj).Replace("\"ProjID\"", "\"PROJECT_ID\"").Replace("\"ID\"", "\"servermain.CHANNEL_UNIQUE_ID\"").Replace("Desc", "common.ALLTYPES_DESCRIPTION").Replace("Name", "common.ALLTYPES_NAME").Replace("CaptureDiag", "servermain.CHANNEL_DIAGNOSTICS_CAPTURE").Replace("NonNormalizedFloatHandling", "servermain.CHANNEL_NON_NORMALIZED_FLOATING_POINT_HANDLING").Replace("WriteOptimDutyCycle", "servermain.CHANNEL_WRITE_OPTIMIZATIONS_DUTY_CYCLE").Replace("WriteOptimMethod", "servermain.CHANNEL_WRITE_OPTIMIZATIONS_METHOD").Replace("Driver", "servermain.MULTIPLE_TYPES_DEVICE_DRIVER").Replace("\"ItemPersistence\"", "\"simulator.CHANNEL_ITEM_PERSISTENCE\"").Replace("\"ItemPersistenceFile\"", "\"simulator.CHANNEL_ITEM_PERSISTENCE_DATA_FILE\"");
            StringContent newChannel = new StringContent(serialized, Encoding.UTF8, "application/json");

            HttpResponseMessage response = await client.PutAsync("config/v1/project/channels/" + name, newChannel);

            if (response.IsSuccessStatusCode)
                return View();
        }

        return NotFound();
    }

    // GET: Channel/Delete/5
    public ActionResult Delete(int id)
    {
        return View();
    }

    // POST: Channel/Delete/5
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Delete(int id, IFormCollection collection)
    {
        try
        {
            // TODO: Add delete logic here

            return RedirectToAction("Index");
        }
        catch
        {
            return View();
        }
    }
}

}

Answer 1

要做到这一点，我必须改变两件事。

首先，我必须将每个参数添加到我的GET Edit方法中，并将这些参数存储在ViewData数组中：

// GET: Channel/Edit/5
    public ActionResult Edit(long projID, string desc, string name, bool captureDiag, int nonNormalizedFloatHandling, long id, int writeOptimDutyCycle, int writeOptimMethod, string driver, bool itemPersistence, string itemPersistenceFile)
    {
        ViewData["projID"] = projID;
        ViewData["desc"] = desc;
        ViewData["name"] = name;
        ViewData["captureDiag"] = captureDiag;
        ViewData["nonNormalizedFloatHandling"] = nonNormalizedFloatHandling;
        ViewData["id"] = id;
        ViewData["writeOptimDutyCycle"] = writeOptimDutyCycle;
        ViewData["writeOptimMethod"] = writeOptimMethod;
        ViewData["driver"] = driver;
        ViewData["itemPersistence"] = itemPersistence;
        ViewData["itemPersistenceFile"] = itemPersistenceFile;

        return View();
    }

接下来，我必须在“索引”视图的“编辑”链接中添加其他asp-route-*属性：

<a asp-action="Edit" asp-controller="Channel" asp-route-projid="@Html.Raw(channel.ProjID)" asp-route-desc="@Html.Raw(channel.Desc)" asp-route-name="@Html.Raw(channel.Name)" asp-route-capturediag="@Html.Raw(channel.CaptureDiag)" asp-route-nonnormalizedfloathandling="@Html.Raw(channel.NonNormalizedFloatHandling)" asp-route-id="@Html.Raw(channel.ID)" asp-route-writeoptimdutycycle="@Html.Raw(channel.WriteOptimDutyCycle)" asp-route-writeoptimmethod="@Html.Raw(channel.WriteOptimMethod)" asp-route-driver="@Html.Raw(channel.Driver)" asp-route-itempersistence="@Html.Raw(channel.ItemPersistence)" asp-route-itempersistencefile="@Html.Raw(channel.ItemPersistenceFile)">Edit</a> |

通过调用@ViewData["<PROP>"]以及将asp-for="PROP"标记添加到HTML元素，我可以通过执行这两项操作来正常访问每个媒体资源。

Answer 2

您可以将模型传递给视图，而不是使用ViewData字典。

return View(model);

在您的视图中，设置模型：

@model YourModelType

在您看来，您现在可以使用@Model.Property

访问媒体资源

在ASP.NET Core MVC视图中，如何访问当前模型的属性？

2 个答案: