MVC4制作网站教程第二章 用户密码修改2.3_实用技巧

一用户
1.1用户注册 
1.2用户登录 
1.3修改密码 

修改密码会用到一个UserChangePassword 模型类，先添加UserChangePassword类 

/// <summary>
  /// 用户修改密码模型
  /// </summary>
  [NotMapped]
  public class UserChangePassword
  {
    /// <summary>
    /// 原密码
    /// </summary>
    [Display(Name = "原密码")]
    [Required(ErrorMessage = "×")]
    [StringLength(20, MinimumLength = 6, ErrorMessage = "×")]
    [DataType(DataType.Password)]
    public string Password { get; set; }
    /// <summary>
    /// 新密码
    /// </summary>
    [Display(Name = "新密码", Description = "6-20个字符。")]
    [Required(ErrorMessage = "×")]
    [StringLength(20, MinimumLength = 6, ErrorMessage = "×")]
    [DataType(DataType.Password)]
    public string NewPassword { get; set; }
    /// <summary>
    /// 确认密码
    /// </summary>
    [Display(Name = "确认密码", Description = "再次输入密码。")]
    [Compare("NewPassword", ErrorMessage = "×")]
    [DataType(DataType.Password)]
    public string ConfirmPassword { get; set; }
  }

用到了数据库的更新，先打开UserRepository.cs 修改Update函数

/// <summary>
    /// 更新用户信息
    /// </summary>
    /// <param name="user"></param>
    /// <returns></returns>
    public override bool Update(User user)
    {
      dbContext.Users.Attach(user);
      dbContext.Entry<User>(user).State = System.Data.EntityState.Modified;
      if (dbContext.SaveChanges() > 0) return true;
      else return false;
    }

在修改密码时需要查出用户信息并更新，需要添加Find(string UserName) 函数 

/// <summary>
    /// 查找用户
    /// </summary>
    /// <param name="UserName">用户名</param>
    /// <returns></returns>
    public User Find(string UserName)
    {
      return dbContext.Users.SingleOrDefault(u => u.UserName == UserName);
    }

好了打开UserController，添加ChangePassword Action 

/// <summary>
    /// 修改密码
    /// </summary>
    /// <returns></returns>
    [UserAuthorize]
    public ActionResult ChangePassword()
    {
      return View();
    }
    [HttpPost]
    [UserAuthorize]
    public ActionResult ChangePassword()
    {
      return View();
    }

添加强类型（UserChangePassword）视图，在视图中添加三个文本框，修改后的视图代码 

@model Ninesky.Models.UserChangePassword
@{
  ViewBag.Title = "修改密码";
  Layout = "~/Views/Shared/_Layout.cshtml";
}

<div class="banner">
  <img src="~/Skins/Default/Images/banner.jpg" />
</div>

@using (Html.BeginForm())
{
  @Html.ValidationSummary(true)

  <div class="form">
    <dl>
      <dt>修改密码</dt>
      <dd>
        <div class="label">@Html.LabelFor(model => model.Password)：</div>
        <div class="ctrl">@Html.PasswordFor(model => model.Password)
          @Html.ValidationMessageFor(model => model.Password)
          @Html.DisplayDescriptionFor(model => model.Password)
        </div>
      </dd>
      <dd>
        <div class="label">@Html.LabelFor(model => model.NewPassword)：</div>
        <div class="ctrl">@Html.PasswordFor(model => model.NewPassword)
          @Html.ValidationMessageFor(model => model.NewPassword)
          @Html.DisplayDescriptionFor(model => model.NewPassword)
        </div>
      </dd>
      <dd>
        <div class="label">@Html.LabelFor(model => model.ConfirmPassword)：</div>
        <div class="ctrl">@Html.PasswordFor(model => model.ConfirmPassword)
          @Html.ValidationMessageFor(model => model.ConfirmPassword)
          @Html.DisplayDescriptionFor(model => model.ConfirmPassword)
        </div>
      </dd>
      <dd>
        <div class="label"></div>
        <div class="ctrl">
          <input type="submit" value="修改密码" />@Html.ValidationMessage("Message")
        </div>
      </dd>
    </dl>
    <div class="clear"></div>
  </div>
}
@section Scripts {
  @Scripts.Render("~/bundles/jqueryval")
}

修改UserController中[HttpPost]方式的ChangePassword()以实现修改密码，修改完成的代码如下： 

[HttpPost]
    [UserAuthorize]
    public ActionResult ChangePassword(UserChangePassword userChangePassword)
    {
      userRsy = new UserRepository();
      if (userRsy.Authentication(UserName, Common.Text.Sha256(userChangePassword.Password)) == 0)
      {
        var _user = userRsy.Find(UserName);
        if (_user == null)
        {
          Error _e = new Error { Title = "修改密码失败", Details = "修改密码时，系统查询不到用户信息", Cause = Server.UrlEncode("<li>用户在修改密码界面停留的时间过长，登录信息已失效。</li><li>系统错误。</li>"), Solution = Server.UrlEncode("<li>返回<a href='" + Url.Action("ChangePassword", "User") + "'>修改密码</a>页面，输入正确的信息后重新注册</li><li>联系网站管理员</li>") };

          return RedirectToAction("Error", "Prompt", _e);
        }
        _user.Password = Common.Text.Sha256(userChangePassword.NewPassword);
        if (userRsy.Update(_user))
        {
          Notice _n = new Notice { Title = "成功修改密码", Details = "您已经成功修改密码，请牢记您的新密码！", DwellTime = 5, NavigationName = "登陆页面", NavigationUrl = Url.Action("Login", "User") };
          return RedirectToAction("Notice", "Prompt", _n);
        }
        else
        {
          Error _e = new Error { Title = "修改密码失败", Details = "修改密码时，更新数据库失败！", Cause = Server.UrlEncode("<li>系统错误。</li>"), Solution = Server.UrlEncode("<li>返回<a href='" + Url.Action("ChangePassword", "User") + "'>修改密码</a>页面，输入正确的信息后重新注册</li><li>联系网站管理员</li>") };
          return RedirectToAction("Error", "Prompt", _e);
        }
      }
      else
      {
        ModelState.AddModelError("Password", "原密码不正确，请重新输入");
        return View();
      }

    }

在上面的代码中用到了一个UserName属性，这个是在UserController添加的属性用于返回Cookie中保存的用户名 

/// <summary>
    /// 获取用户名
    /// </summary>
    public string UserName {
      get {
        HttpCookie _cookie = Request.Cookies["User"];
        if (_cookie == null) return "";
        else return _cookie["UserName"];
        }
    }

好了，浏览器中预览一下

测试一下，OK,大功告成！

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