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您好我是mvc4的新来者c＃开发我有一个问题从下拉列表传递数据到我的数据库，它一直给我一个错误，'我必须检查以确定对象是null在调用方法之前'我真的很感谢一些帮助你的术语，因为我一直试图解决这个简单问题两天，现在没有成功，这里是我的代码。从下拉列表到数据库的数据c＃mvc
CSHTML:
@model UnityServiceProject.Models.NewAccountModel
@{
ViewBag.Title = "NewAccount";
}
<h2>NewAccount</h2>
@using (@Html.BeginForm()){
@Html.ValidationSummary(true,"Please fill all required fields Thank You.")
<fieldset>
<legend>Create Account</legend>
<ol>
<li>@Html.LabelFor(u => u.charityName)</li>
<li>@Html.TextBoxFor(u => u.charityName)</li>
<li>@Html.LabelFor(u => u.charityNumber)</li>
<li>@Html.TextBoxFor(u => u.charityNumber)</li>
<li>@Html.LabelFor(u => u.addressLine1)</li>
<li>@Html.TextBoxFor(u => u.addressLine1)</li>
<li>@Html.LabelFor(u => u.addressLine2)</li>
<li>@Html.TextBoxFor(u => u.addressLine2)</li>
<li>@Html.LabelFor(u => u.City)</li>
<li>@Html.TextBoxFor(u => u.City)</li>
<li>@Html.LabelFor(u => u.County)</li>
<li>@Html.DropDownList("Counties", Model.County)</li>
<li>@Html.LabelFor(u => u.Phone)</li>
<li>@Html.TextBoxFor(u => u.Phone)</li>
<li>@Html.LabelFor(u => u.Email)</li>
<li>@Html.TextBoxFor(u =>u.Email)</li>
<li>@Html.LabelFor(u => u.registeredPassword)</li>
<li>@Html.LabelFor(u => u.Comments)</li>
<li>@Html.TextBoxFor(u => u.Comments)</li>
</ol>
</fieldset>
<input type="submit" value="New Account" />
}
MY MODEL:
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using UnityServiceProject.Models;
namespace UnityServiceProject.Models
{
public class NewAccountModel
{
[Required]
[StringLength(150)]
[Display(Name="Charity Name: ")]
public string charityName { get; set; }
[Required]
[StringLength(150)]
[Display(Name="Charity Number: ")]
public string charityNumber { get; set; }
[Required]
[StringLength(100)]
[Display(Name="Address Line 1: ")]
public string addressLine1 { get; set; }
[Required]
[StringLength(100)]
[Display(Name="Address Line 2: ")]
public string addressLine2 { get; set; }
[Required]
[StringLength(100)]
[Display(Name="City: ")]
public string City { get; set; }
[Required]
[StringLength(100)]
[Display(Name = "Select County: ")]
public SelectList County { get; set; }
[Required]
[StringLength(100)]
[Display(Name="Phone Number: ")]
public string Phone { get; set; }
[Required]
[EmailAddress]
[StringLength(150)]//'UserLogin table field' setting max amount of characters
[Display(Name = "Registered Email Address: ")]
public string Email { get; set; }
[Required]
[DataType(DataType.Password)]
[StringLength(200)]
[Display(Name = "Registered Password: ")]
public string registeredPassword { get; set; }
[StringLength(300)]
[Display(Name = "Comments: ")]
public string Comments { get; set; }
}
}
MY CONTROLLER
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Configuration;
using UnityServiceProject.Models;
namespace UnityServiceProject.Controllers
{
public class NewAccountController : Controller
{
//
// GET: /NewAccount/
public ActionResult Index()
{
return View();
}
[HttpGet]
public ActionResult NewAccount()
{
return View();
}
[HttpPost]
public ActionResult NewAccount(NewAccountModel newAcc)
{
List<SelectListItem> listItem = new List<SelectListItem>();
NewAccountModel nam = new NewAccountModel();
listItem.Add(new SelectListItem() { Value = "1", Text = "Antrim" }
);
listItem.Add(new SelectListItem() { Value = "2", Text = "Armagh" }
);
listItem.Add(new SelectListItem() { Value = "3", Text = "Carlow" }
);
listItem.Add(new SelectListItem() { Value = "4", Text = "Cavan" }
);
listItem.Add(new SelectListItem() { Value = "5", Text = "Clare" }
);
listItem.Add(new SelectListItem() { Value = "6", Text = "Cork" }
);
listItem.Add(new SelectListItem() { Value = "7", Text = "Derry" }
);
listItem.Add(new SelectListItem() { Value = "8", Text = "Donegal" }
);
listItem.Add(new SelectListItem() { Value = "9", Text = "Down" }
);
listItem.Add(new SelectListItem() { Value = "10", Text = "Dublin" }
);
listItem.Add(new SelectListItem() { Value = "11", Text ="Fermanagh"}
);
listItem.Add(new SelectListItem() { Value = "12", Text = "Galway" }
);
listItem.Add(new SelectListItem() { Value = "13", Text = "Kerry" }
);
listItem.Add(new SelectListItem() { Value = "14", Text = "Kildare" }
);
listItem.Add(new SelectListItem() { Value = "15", Text = "Kilkenny"}
);
listItem.Add(new SelectListItem() { Value = "16", Text = "Laois" }
);
listItem.Add(new SelectListItem() { Value = "17", Text = "Leitrim" }
);
listItem.Add(new SelectListItem() { Value = "18", Text = "Limerick"}
);
listItem.Add(new SelectListItem() { Value = "19", Text "Longford" }
);
listItem.Add(new SelectListItem() { Value = "20", Text = "Louth" }
);
listItem.Add(new SelectListItem() { Value = "21", Text = "Mayo" }
);
listItem.Add(new SelectListItem() { Value = "22", Text = "Meath" }
);
listItem.Add(new SelectListItem() { Value = "23", Text = "Monaghan"}
);
listItem.Add(new SelectListItem() { Value = "24", Text = "Offaly" }
);
listItem.Add(new SelectListItem() { Value = "25", Text "Roscommon" }
);
listItem.Add(new SelectListItem() { Value = "26", Text = "Sligo" }
);
listItem.Add(new SelectListItem() { Value = "27", Text ="Tipperary"}
);
listItem.Add(new SelectListItem() { Value = "28", Text = "Tyrone" }
);
listItem.Add(new SelectListItem() { Value = "4", Text = "Waterford"}
);
listItem.Add(new SelectListItem() { Value = "4", Text "Westmeath" }
);
listItem.Add(new SelectListItem() { Value = "4", Text = "Wexford" }
);
listItem.Add(new SelectListItem() { Value = "4", Text = "Wicklow" }
);
nam.County = new SelectList(listItem, "Value", "Text");
//if (listItem != null)
//{
// listItem.Clear();
//}
if(ModelState.IsValid)
{
using (var db = new UnityServiceEntities())
{
//create New Account entity
var adNewAcc = db.AddNewAccounts.Create();
adNewAcc.charityName = newAcc.charityName;
adNewAcc.charityNumber = newAcc.charityNumber;
adNewAcc.addressLine1 = newAcc.addressLine1;
adNewAcc.addressLine2 = newAcc.addressLine2;
adNewAcc.City = newAcc.City;
adNewAcc.County = newAcc.County.SelectedValue.ToString();
adNewAcc.Phone = newAcc.Phone;
adNewAcc.emailAddress = newAcc.Email;
adNewAcc.registeredPassword = newAcc.registeredPassword;
adNewAcc.Comments = newAcc.Comments;
db.AddNewAccounts.Add(adNewAcc);
db.SaveChanges();
return RedirectToAction("Index", "Home");
}
}
return View(newAcc);
}
}
}
Thank You!
编辑您的问题以删除所有不相关的代码。没有人想通过所有这些 - 尤其是添加'SelectListItem'的数百行。您的问题涉及您的模型中的一个属性 - 显示与此相关的代码。并显示你得到的实际错误信息。 – 2015-02-12 02:58:59