我正在尝试通过编辑视图编辑元素。在调试时，我注意到我正在尝试更新数据库的对象具有null或zeroed字段。编辑视图似乎不会返回我正在输入的数据。 型号：
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Data.Entity;
using Microsoft.Data.Entity.Infrastructure;
namespace METALIMPEX.Models
{
public class Condition
{
[Key]
[Display(Name = "Condition ID")]
[Column("condition_id")]
[Required]
public int conditionID { get; set; }
[Display(Name = "Date and time")]
[Column("condition_date")]
[Timestamp]
[Required]
public DateTime dateTime { get; set; }
[Display(Name = "Component ID")]
[Column("component")]
[Required]
public int componentID { get; set; }
[Display(Name = "Operator ID")]
[Column("operator")]
[Required]
public int operatorID { get; set; }
[Display(Name = "Component status")]
[Column("condition")]
[Required]
public bool condition { get; set; }
[Display(Name = "Comments")]
[Column("remarks")]
[Required]
public string comments { get; set; }
}
public class ConditionDBContext : DbContext
{
public DbSet<Condition> Conditions { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer("Data Source=DELL-XPS\\SQLEXPRESS;Initial Catalog=METALIMPEX;Integrated Security=True");
}
}
}
控制器：
using System.Linq;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Rendering;
using Microsoft.Data.Entity;
using METALIMPEX.Models;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Web;
using System;
namespace METALIMPEX.Controllers
{
public class ConditionController : Controller
{
private ApplicationDbContext _context;
private ConditionDBContext db = new ConditionDBContext();
IList<Condition> conditionList = new List<Condition>();
public ConditionController(ApplicationDbContext context)
{
_context = context;
//DEPRECATED CODE, MANUAL QUERY, PROJECT NOW USES DBCONTEXT
/*string strConnection = "Data Source=DELL-XPS\\SQLEXPRESS;Initial Catalog=METALIMPEX;Integrated Security=True";
string sqlQuery = "SELECT REPLICATE('0',6-LEN(RTRIM(PartID))) + RTRIM(PartID) AS 'Part ID', REPLICATE('0', 6 - LEN(RTRIM(OperatorID))) + RTRIM(OperatorID) AS 'Operator ID', Date_Time AS 'Time', IsPartWorking AS 'Part Status', IsMachineWorking AS 'Machine Status' FROM Defect";
SqlConnection sqlConnection = new SqlConnection(strConnection);
SqlCommand command = new SqlCommand(sqlQuery, sqlConnection);
SqlDataReader Dr;
try {
sqlConnection.Open();
Dr = command.ExecuteReader();
while (Dr.Read())
{
conditionList.Add(new Defect()
{
conditionID = Dr["Part ID"].ToString(),
operatorID = Dr["Operator ID"].ToString(),
dateTime = Dr["Time"].ToString(),
partStatus = (bool)Dr["Part Status"],
machineStatus = (bool)Dr["Machine Status"]
});
};
Dr.Dispose();
}
catch (SqlException) {
throw new InvalidOperationException("An error has occured while connecting to the database");
//OR
//return View("Error");
}*/
}
// GET: Condition
public IActionResult Index()
{
//return View(conditionList);
return View(db.Conditions.ToList());
}
// GET: Condition/Details/5
public IActionResult Details()
{
return View(conditionList);
}
// GET: Condition/Create
public IActionResult Create()
{
return View();
}
// POST: Condition/Create
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Create(Condition condition)
{
if (ModelState.IsValid)
{
//_context.Condition.Add(condition);
//_context.SaveChanges();
return RedirectToAction("Index");
}
return View(condition);
}
// GET: Condition/Edit/5
public IActionResult Edit(int id)
{
if (conditionList == null)
{
return HttpNotFound();
}
Condition condition = db.Conditions.Single(m => m.conditionID == id);
return View(condition);
}
// POST: condition/Edit/5
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Edit(Condition condition)
{
if (ModelState.IsValid)
{
db.Update(condition);
db.Entry(condition).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(condition);
}
// GET: condition/Delete/5
[ActionName("Delete")]
public IActionResult Delete(string id)
{
return View(conditionList);
}
// POST: condition/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public IActionResult DeleteConfirmed(string id)
{
/*Movie movie = db.Movies.Find(id);
if (movie == null)
{
return HttpNotFound();
}
db.Movies.Remove(movie);
db.SaveChanges();
return RedirectToAction("Index");*/
return RedirectToAction("Index");
}
}
}
查看：
@model METALIMPEX.Models.Condition
@{
ViewData["Title"] = "Edit";
}
<h2>Edit</h2>
<form asp-action="Edit">
<div class="form-horizontal">
<h4>Condition</h4>
<hr />
<div asp-validation-summary="ValidationSummary.ModelOnly" class="text-danger"></div>
<input type="hidden" asp-for="conditionID" />
<div class="form-group">
<label asp-for="componentID" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="componentID" class="form-control" />
<span asp-validation-for="componentID" class="text-danger" />
</div>
</div>
<div class="form-group">
<label asp-for="operatorID" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="operatorID" class="form-control" />
<span asp-validation-for="operatorID" class="text-danger" />
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<div class="checkbox">
<input asp-for="condition" />
<label asp-for="condition"></label>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="dateTime" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="dateTime" class="form-control" />
<span asp-validation-for="dateTime" class="text-danger" />
</div>
</div>
<div class="form-group">
<label asp-for="comments" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="comments" class="form-control" />
<span asp-validation-for="comments" 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>
</form>
<div>
<a asp-action="Index">Back to List</a>
</div>
@section Scripts {
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
}
我是.NET的初学者，所以我不知道这里有什么问题。编辑视图是由框架生成的，所以我认为它应该正常工作。
有什么想法吗？
答案 0 :(得分：0)
问题在于修改操作方法的参数名称。以下是点击保存按钮时从视图中发布的网址编码表单数据。
conditionID =安培;日期时间= 2013年12月1日和安培; COMPONENTID = 1＆安培; operatorID = 1＆安培;条件=真安培;注释=
操作参数名称为条件，并且传入的表单数据中存在键值对 condition = true 。 MVC model binding进程将尝试将参数/属性（在复杂模型的情况下）映射到相应的路由/查询字符串/请求正文数据。
因此，它试图将表单数据中条件的值（即 true ）映射到action参数，最终无法转换为bool 到对象。
将参数名称更改为与表单数据中的任何键名称不对应的任何名称，它应该有效。