講了25天的前言，
終於要進入正題了，
今天我們建了一個使用者的資料表

然後又是這個註冊畫面

這是前端的程式碼，我們用Post來接收資料

@{
    ViewBag.Title = "Home Page";
    Layout = null;

    var cityList = ViewBag.CityList;
}

@Styles.Render("~/Content/css")
@Scripts.Render("~/bundles/modernizr")

<form style="margin-left:10px;" method="post" action="">
    <h1>請輸入使用者資料</h1>
    <div>
        <span style="color:red">@ViewBag.Msg</span>
    </div>
    <div class="form-group">
        <label for="exampleInputEmail1">帳號</label>
        <input type="text" class="form-control" id="Account" name="account" placeholder="輸入帳號" value="">
        <small id="emailHelp" class="form-text text-muted">請輸入英數字</small>
    </div>
    <div class="form-group">
        <label for="exampleInputPassword1">新的密碼</label>
        <input type="password" class="form-control" id="Password1" name="password1" placeholder="輸入密碼" value="">
    </div>
    <div class="form-group">
        <label for="exampleInputPassword1">再次確認</label>
        <input type="password" class="form-control" id="Password2" name="password2" placeholder="輸入密碼" value="">
    </div>
    <div class="form-group">
        <label for="Address">地址</label>
        <select id="city" name="city">
            <option value="">全部</option>
            @for(int i=0;i<cityList.Count;i++)
            {
                <option value="@cityList[i].CityId">@cityList[i].CityName</option>
            }
        </select>
        <select id="village" name="village">
            <option value="">請選擇縣市</option>
        </select>
        <input type="text" class="form-control" id="Address" name="address" placeholder="輸入地址" value="">
    </div>
    <button type="submit" class="btn btn-primary">確定</button>
    <button type="reset" class="btn btn-warning">清除</button>
</form>

<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script>
    $("#city").change(function () {
        var value = $("#city").val();
        console.log(value);
        $.ajax({
            type: "Post",
            url: "../Home/Village?id=" + value,
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            async: false,
            success: function (data) {
                $("#village").empty();
                if (data == "") {
                    $("#village").append("<option value=''>請選擇縣市</option>");
                }
                else {
                    var jo = JSON.parse(data);
                    $("#village").append("<option value=''>請選擇</option>");
                    for (i = 0; i < jo.length; i++) {
                        $("#village").append("<option value='" + jo[i].VillageId + "'>" + jo[i].VillageName + "</option>");
                    }
                }
            },
            failure: function (errMsg) {
                $("#village").empty();
                $("#village").append("<option value=''>請選擇縣市</option>");
            }
        })
    });
</script>

接下來我們輸入資料

然後在後端我們來做一些判斷，
原本應該每項都判斷的，
為了節省時間只判斷密碼而已，
很明顯這個密碼就是不一樣...

using MVCTest.Models;
using MySql.Data.MySqlClient;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MVCTest.Controllers
{
    public class HomeController : Controller
    {
        MyDataBase db = new MyDataBase();
        public ActionResult Index()
        {
            List<City> cityList = db.GetCityList();

            ViewBag.CityList = cityList;
            return View();
        }

        [HttpPost]
        public ActionResult Index(FormCollection post)
        {
            string account = post["account"];
            string password1 = post["password1"];
            string password2 = post["password2"];
            string city = post["city"];
            string village = post["village"];
            string address = post["address"];

            if(string.IsNullOrWhiteSpace(password1) || password1 != password2)
            {
                List<City> cityList = db.GetCityList();
                ViewBag.CityList = cityList;
                ViewBag.Msg = "密碼輸入錯誤";
                return View();
            }
            else
            {
                Response.Redirect("Login");
                return new EmptyResult();
            }
        }

        [HttpPost]
        public ActionResult Village(string id = "")
        {
            List<Village> list = db.GetVillageList(id);
            string result = "";
            if (list == null)
            {
                //讀取資料庫錯誤
                return Json(result);
            }
            else
            {
                result = JsonConvert.SerializeObject(list);
                return Json(result);
            }
        }
    }
}

於是因為密碼不一樣，
就傳回了錯誤回到原來的頁面...

可是，
說好的資料怎麼不見了！？
我辛辛苦苦Key的資料(假設有十幾項)跑哪去了？

明天我們來做保存資料的動作吧...

欲知後事如何，
請待下回分曉...

--
小弟不才，
如果有謬誤或是要補充的，
都歡迎一起來討論！