學(xué)習(xí)制作MVC4分頁控件（下）

更新時間：2016年08月23日 11:48:27 作者：洞庭夕照

這篇文章主要教大家學(xué)習(xí)制作MVC4分頁控件，自己動手編寫HtmlHelper-Pager分頁控件，感興趣的小伙伴們可以參考一下

上一次做分頁控件的時候設(shè)想的把分頁設(shè)置類保存到數(shù)據(jù)庫，后來覺得的沒必要這么做。分頁的包括htmlhelper 數(shù)據(jù)模型和分頁設(shè)置都在PagerExtensions.cs中，不跟數(shù)據(jù)庫發(fā)生關(guān)系，當(dāng)其他項目中需要用分頁的時候直接拷貝這個文件過去就可以直接用。欄目中的分頁設(shè)置直接在欄目中添加字段然后在控制器中new一個PagerConfig，然后設(shè)置響應(yīng)值。

修改后的PagerConfig說明

PagerConfig類

/// <summary>
  /// 分頁配置
  /// </summary>
  public class PagerConfig
  {
    /// <summary>
    /// 當(dāng)前頁
    /// </summary>
    public int CurrentPage { get; set; }
    /// <summary>
    /// 每頁記錄數(shù)
    /// </summary>
    public int PageSize { get; set; }
    /// <summary>
    /// 總頁數(shù)
    /// </summary>
    public int TotalPage { get { return (int)Math.Ceiling(TotalRecord / (double)PageSize); } }
    /// <summary>
    /// 總記錄數(shù)
    /// </summary>
    public int TotalRecord { get; set; }
    /// <summary>
    /// 記錄單位
    /// </summary>
    public string RecordUnit { get; set; }
    /// <summary>
    /// 記錄名稱
    /// </summary>
    public string RecordName { get; set; }

    public PagerConfig()
    {
      CurrentPage = 1;
      PageSize = 20;
      RecordUnit = "條";
      RecordName = "記錄";
    }
  }

后面要修改欄目模型用來保存分頁設(shè)置

Category模型字段說明

修改后的欄目模型類

/// <summary>
  /// 欄目模型
  /// </summary>
  public class Category
  {
    [Key]
    [Display(Name = "欄目Id")]
    public int CategoryId { get; set; }
    /// <summary>
    /// 欄目名稱
    /// </summary>
    [Display(Name="欄目名稱",Description="2-20個字符")]
    [Required(ErrorMessage="×")]
    [StringLength(50,ErrorMessage="×")]
    public string Name { get; set; }
    /// <summary>
    /// 父欄目編號
    /// </summary>
    [Display(Name="父欄目")]
    [Required(ErrorMessage="×")]
    public int ParentId { get; set; }
    /// <summary>
    /// 父欄目路徑【根節(jié)點的值為0，子節(jié)點的值為：0,1,6,76】
    /// </summary>
    [Required()]
    public string ParentPath { get; set; }
    /// <summary>
    /// 欄目類型【0-常規(guī)欄目；1-單頁欄目；2-外部鏈接】
    /// </summary>
    [Display(Name="欄目類型")]
    [Required(ErrorMessage = "×")]
    public int Type { get; set; }
    /// <summary>
    /// 內(nèi)容模型【僅在欄目為普通欄目時有效】
    /// </summary>
    [Display(Name="內(nèi)容模型")]
    [StringLength(50, ErrorMessage = "×")]
    public string Model { get; set; }
    /// <summary>
    /// 欄目視圖
    /// </summary>
    [Display(Name = "欄目視圖", Description = "欄目頁的視圖，最多255個字符。。")]
    [StringLength(255, ErrorMessage = "×")]
    public string CategoryView { get; set; }
    /// <summary>
    /// 內(nèi)容頁視圖
    /// </summary>
    [Display(Name = "內(nèi)容視圖", Description = "內(nèi)容頁視圖，最多255個字符。。")]
    [StringLength(255, ErrorMessage = "×")]
    public string ContentView { get; set; }
    /// <summary>
    /// 鏈接地址
    /// </summary>
    [Display(Name="鏈接地址",Description="點擊欄目時跳轉(zhuǎn)到的鏈接地址,最多255個字符。")]
    [StringLength(255,ErrorMessage = "×")]
    public string LinkUrl { get; set; }
    /// <summary>
    /// 欄目排序
    /// </summary>
    [Display(Name = "欄目排序", Description = "針對同級欄目,數(shù)字越小順序越靠前。")]
    [Required(ErrorMessage = "×")]
    public int Order { get; set; }
    /// <summary>
    /// 內(nèi)容排序
    /// </summary>
    [Display(Name = "內(nèi)容排序", Description = "欄目所屬內(nèi)容的排序方式。")]
    public int? ContentOrder { get; set; }
    /// <summary>
    /// 每頁記錄數(shù)
    /// </summary>
    [Display(Name = "每頁記錄數(shù)", Description = "欄目所屬內(nèi)容的排序方式。")]
    public int? PageSize { get; set; }
    /// <summary>
    /// 記錄單位
    /// </summary>
    [Display(Name = "記錄單位", Description = "記錄的數(shù)量單位。如文章為“篇”；新聞為“條”。")]
    [StringLength(255, ErrorMessage = "×")]
    public string RecordUnit { get; set; }
    /// <summary>
    /// 記錄名稱
    /// </summary>
    [Display(Name = "記錄名稱", Description = "記錄的名稱。如“文章”、“新聞”、“教程”等。")]
    [StringLength(255, ErrorMessage = "×")]
    public string RecordName { get; set; }
    public Category()
    {
      ParentPath = "0";
      Type = 0;
      CategoryView = "Index";
      ContentView = "Index";
      Order = 0;
      ContentOrder = 1;
      PageSize = 20;
      RecordUnit = "條";
      RecordName = "篇";
    }
  }

由于欄目的模型字段發(fā)生變換添加修改欄目信息的視圖和action也要進(jìn)行相應(yīng)修改。

修改ManageAdd視圖

@model Ninesky.Models.Category

@{
  ViewBag.Title = "ManageAdd";
  Layout = "~/Views/Layout/_Manage.cshtml";
}


<div class="workspace">
  <div class="inside">
    <div class="notebar">
      <img alt="" src="~/Skins/Default/Manage/Images/Category.gif" />添加欄目
    </div>
    @using (Html.BeginForm())
    {
      @Html.ValidationSummary(true)

      <fieldset>
        <legend>欄目</legend>
        <ul>
          <li>
            <div class="editor-label">
              @Html.LabelFor(model => model.Type)
            </div>
            <div class="editor-field">
              @Html.DropDownList("Type")
              @Html.ValidationMessageFor(model => model.Type)
              @Html.DisplayDescriptionFor(model => model.Type)
            </div>
          </li>
          <li>
            <div class="editor-label">
              @Html.LabelFor(model => model.Name)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.Name)
              @Html.ValidationMessageFor(model => model.Name)
              @Html.DisplayDescriptionFor(model => model.Name)
            </div>
          </li>
          <li>
            <div class="editor-label">
              @Html.LabelFor(model => model.ParentId)
            </div>
            <div class="editor-field">
              @Html.TextBoxFor(model => model.ParentId, new { @class = "easyui-combotree", data_options = "url:'" + Url.Action("JsonTreeParent", "Category") + "'" })
              @Html.ValidationMessageFor(model => model.ParentId)
              @Html.DisplayDescriptionFor(model => model.ParentId)
            </div>
          </li>
          <li id="li_model">
            <div class="editor-label">
              @Html.LabelFor(model => model.Model)
            </div>
            <div class="editor-field">
              @Html.DropDownList("Model")
              @Html.ValidationMessageFor(model => model.Model)
              @Html.DisplayDescriptionFor(model => model.Model)
            </div>
          </li>
          <li id="li_categoryview">
            <div class="editor-label">
              @Html.LabelFor(model => model.CategoryView)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.CategoryView)
              @Html.ValidationMessageFor(model => model.CategoryView)
              @Html.DisplayDescriptionFor(model => model.CategoryView)
            </div>
          </li>
          <li id="li_contentview">
            <div class="editor-label">
              @Html.LabelFor(model => model.ContentView)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.ContentView)
              @Html.ValidationMessageFor(model => model.ContentView)
              @Html.DisplayDescriptionFor(model => model.ContentView)
            </div>
          </li>
          <li id="li_url">
            <div class="editor-label">
              @Html.LabelFor(model => model.LinkUrl)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.LinkUrl)
              @Html.ValidationMessageFor(model => model.LinkUrl)
              @Html.DisplayDescriptionFor(model => model.LinkUrl)
            </div>
          </li>
          <li>
            <div class="editor-label">
              @Html.LabelFor(model => model.Order)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.Order)
              @Html.ValidationMessageFor(model => model.Order)
              @Html.DisplayDescriptionFor(model => model.Order)
            </div>
          </li>
          <li id="li_corder">
            <div class="editor-label">
              @Html.LabelFor(model => model.ContentOrder)
            </div>
            <div class="editor-field">
              @Html.DropDownList("ContentOrders")
              @Html.ValidationMessageFor(model => model.ContentOrder)
              @Html.DisplayDescriptionFor(model => model.ContentOrder)
            </div>
          </li>
          <li id="li_psize">
            <div class="editor-label">
              @Html.LabelFor(model => model.PageSize)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.PageSize)
              @Html.ValidationMessageFor(model => model.PageSize)
              @Html.DisplayDescriptionFor(model => model.PageSize)
            </div>
          </li>
          <li id="li_runit">
            <div class="editor-label">
              @Html.LabelFor(model => model.RecordUnit)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.RecordUnit)
              @Html.ValidationMessageFor(model => model.RecordUnit)
              @Html.DisplayDescriptionFor(model => model.RecordUnit)
            </div>
          </li>
          <li id="li_rname">
            <div class="editor-label">
              @Html.LabelFor(model => model.RecordName)
            </div>
            <div class="editor-field">
              @Html.EditorFor(model => model.RecordName)
              @Html.ValidationMessageFor(model => model.RecordName)
              @Html.DisplayDescriptionFor(model => model.RecordName)
            </div>
          </li>
          <li>
            <div class="editor-label">
            </div>
            <div class="editor-field">
              <input type="submit" value="添加" />
            </div>
          </li>
        </ul>
      </fieldset>
    }
  </div>
</div>
<div class="left">
  <div class="top"></div>
    @Html.Action("ManagePartialTree", "Category")
</div>
<div class="split"></div>
<div class="clear"></div>
<script type="text/javascript">
  Details();
  $("#Type").change(function () {
    Details();
  });
  function Details() {
    var v = $("#Type").val();
    if (v == "0") {
      $("#li_model").show();
      $("#li_categoryview").show();
      $("#li_contentview").show();
      $("#li_url").hide();
      $("#li_corder").show();
      $("#li_psize").show();
      $("#li_runit").show();
      $("#li_rname").show();
    }
    else if (v == "1") {
      $("#li_model").hide();
      $("#li_categoryview").show();
      $("#li_contentview").hide();
      $("#li_url").hide();
      $("#li_corder").hide();
      $("#li_psize").hide();
      $("#li_runit").hide();
      $("#li_rname").hide();
    }
    else if (v == "2") {
      $("#li_model").hide();
      $("#li_categoryview").hide();
      $("#li_contentview").hide();
      $("#li_url").show();
      $("#li_corder").hide();
      $("#li_psize").hide();
      $("#li_runit").hide();
      $("#li_rname").hide();
    }
  }
</script>
@section Scripts {
  @Scripts.Render("~/bundles/jqueryval")
}

修改ManageAdd(Category category)，主要是首先驗證選定的父欄目是否存在。根據(jù)選定的欄目類型驗證相應(yīng)的字段是否輸入，設(shè)置無關(guān)字段為null

[AdminAuthorize]
    [HttpPost]
    public ActionResult ManageAdd(Category category)
    {
      //父欄目是否存在
      if (categoryRsy.Find(category.ParentId) == null) ModelState.AddModelError("ParentId", "父欄目不存在。");
      //ParentPath
      if (category.ParentId == 0) category.ParentPath = "0";
      else category.ParentPath = categoryRsy.Find(category.ParentId).ParentPath + "," + category.ParentId; 
      switch (category.Type)
      {
        case 0://常規(guī)欄目
          if (string.IsNullOrEmpty(category.CategoryView)) ModelState.AddModelError("CategoryView", "×");
          category.LinkUrl = null;
          if (!string.IsNullOrEmpty(category.Model))
          {
            if (string.IsNullOrEmpty(category.ContentView)) ModelState.AddModelError("ContentView", "×");
            if (category.ContentOrder == null) category.ContentOrder = 0;
            if (category.PageSize == null) category.PageSize = 20;
            if (string.IsNullOrEmpty(category.RecordUnit)) category.RecordUnit = "條";
            if (string.IsNullOrEmpty(category.RecordName)) category.RecordName = "記錄";
          }
          else
          {
            category.ContentView = null;
            category.ContentOrder = null;
            category.PageSize = null;
            category.RecordUnit = null;
            category.RecordName = null;
          }
          break;
        case 1://單頁欄目
          if (string.IsNullOrEmpty(category.CategoryView)) ModelState.AddModelError("CategoryView", "×");
          category.LinkUrl = null;
          category.ContentView = null;
          category.ContentOrder = null;
          category.PageSize = null;
          category.RecordUnit = null;
          category.RecordName = null;
          break;
        case 2://外部鏈接
          if (string.IsNullOrEmpty(category.LinkUrl)) ModelState.AddModelError("LinkUrl", "×");
          category.CategoryView = null;
          category.ContentView = null;
          category.ContentOrder = null;
          category.PageSize = null;
          category.RecordUnit = null;
          category.RecordName = null;
          break;
        default:
          ModelState.AddModelError("Type", "×");
          break;
      }
      if (ModelState.IsValid)
      {
        if (categoryRsy.Add(category))
        {
          Notice _n = new Notice { Title = "添加欄目成功", Details = "您已經(jīng)成功添加[" + category.Name + "]欄目！", DwellTime = 5, NavigationName = "欄目列表", NavigationUrl = Url.Action("ManageDefault", "Category") };
          return RedirectToAction("ManageNotice", "Prompt", _n);
        }
        else
        {
          Error _e = new Error { Title = "添加欄目失敗", Details = "在添加欄目時，未能保存到數(shù)據(jù)庫", Cause = "系統(tǒng)錯誤", Solution = Server.UrlEncode("<li>返回<a href='" + Url.Action("ManageAdd", "Category") + "'>添加欄目</a>頁面，輸入正確的信息后重新操作</li><li>聯(lián)系網(wǎng)站管理員</li>") };
          return RedirectToAction("ManageError", "Prompt", _e);
        }
      }
      else
      {
        ModuleRepository _moduleRsy = new ModuleRepository();
        var _modules = _moduleRsy.List(true);
        List<SelectListItem> _slimodule = new List<SelectListItem>(_modules.Count());
        _slimodule.Add(new SelectListItem { Text = "無", Value = "" });
        foreach (Module _module in _modules)
        {
          _slimodule.Add(new SelectListItem { Text = _module.Name, Value = _module.Model });
        }
        ViewData.Add("Model", _slimodule);
        ViewData.Add("Type", TypeSelectList);
        ViewData.Add("ContentOrders", CommonModel.ContentOrders);
        return View(category);
      }
    }

下面就該欄目詳細(xì)信息的視圖ManageDetails.cshtml，基本與ManageAdd視圖。

然后修改更新欄目信息action [ManageUpdate(Category category)]。

在這里1、要檢查父欄目是不是其本身或其子欄目，如果是添加驗證未通過信息。2、根據(jù)選定的欄目類型驗證相應(yīng)的字段是否輸入，設(shè)置無關(guān)字段為null。3、如果父欄目發(fā)生更還，更改其本身及其子欄目的ParentPath。

/// <summary>
    /// 修改欄目信息
    /// </summary>
    /// <param name="category"></param>
    /// <returns></returns>
    public ActionResult ManageUpdate(Category category)
    {
      //父欄目不能為本身或子欄目
      if (categoryRsy.IsSelfOrLower(category.CategoryId,category.ParentId)) ModelState.AddModelError("ParentId", "父欄目不能是其本身或其子欄目");
      switch (category.Type)
      {
        case 0://常規(guī)欄目
          if (string.IsNullOrEmpty(category.CategoryView)) ModelState.AddModelError("CategoryView", "×");
          category.LinkUrl = null;
          if (!string.IsNullOrEmpty(category.Model))
          {
            if (string.IsNullOrEmpty(category.ContentView)) ModelState.AddModelError("ContentView", "×");
            if (category.ContentOrder == null) category.ContentOrder = 0;
            if (category.PageSize == null) category.PageSize = 20;
            if (string.IsNullOrEmpty(category.RecordUnit)) category.RecordUnit = "條";
            if (string.IsNullOrEmpty(category.RecordName)) category.RecordName = "記錄";
          }
          else
          {
            category.ContentView = null;
            category.ContentOrder = null;
            category.PageSize = null;
            category.RecordUnit = null;
            category.RecordName = null;
          }
          break;
        case 1://單頁欄目
          if (string.IsNullOrEmpty(category.CategoryView)) ModelState.AddModelError("CategoryView", "×");
          category.LinkUrl = null;
          category.ContentView = null;
          category.ContentOrder = null;
          category.PageSize = null;
          category.RecordUnit = null;
          category.RecordName = null;
          break;
        case 2://外部鏈接
          if (string.IsNullOrEmpty(category.LinkUrl)) ModelState.AddModelError("LinkUrl", "×");
          category.CategoryView = null;
          category.ContentView = null;
          category.ContentOrder = null;
          category.PageSize = null;
          category.RecordUnit = null;
          category.RecordName = null;
          break;
        default:
          ModelState.AddModelError("Type", "×");
          break;
      }
      if (ModelState.IsValid)
      { 
        var _pId = categoryRsy.Find(category.CategoryId).ParentId;
        var _oldParentPath = categoryRsy.Find(category.CategoryId).ParentPath + "," + category.CategoryId;
        //父欄目發(fā)生更改
        if (category.ParentId != _pId)
        {
          //ParentPath
          if (category.ParentId == 0) category.ParentPath = "0";
          else category.ParentPath = categoryRsy.Find(category.ParentId).ParentPath + "," + category.ParentId;
        }
        if (categoryRsy.Update(category))
        {
          Notice _n = new Notice { Title = "修改欄目成功", Details = "修改欄目成功！", DwellTime = 5, NavigationName = "欄目詳細(xì)信息", NavigationUrl = Url.Action("ManageDetails", "Category", new { id = category.CategoryId }) };
          if (_oldParentPath != category.ParentPath)
          {
            //修改子欄目ParentPath
            categoryRsy.UpdateCategorysParentPath(_oldParentPath, category.ParentPath+"," + category.CategoryId);
          }
          return RedirectToAction("ManageNotice", "Prompt", _n);
        }
        else
        {
          Error _e = new Error { Title = "修改欄目失敗", Details = "在修改欄目信息時，未能保存到數(shù)據(jù)庫", Cause = "系統(tǒng)錯誤", Solution = Server.UrlEncode("<li>返回<a href='" + Url.Action("ManageDetails", "Category", new { id = category.CategoryId }) + "'>欄目詳細(xì)資料</a>頁面，修改信息后重新操作</li><li>聯(lián)系網(wǎng)站管理員</li>") };
          return RedirectToAction("ManageError", "Prompt", _e);
        }
      }
      else
      {
        ModuleRepository _moduleRsy = new ModuleRepository();
        var _modules = _moduleRsy.List(true);
        List<SelectListItem> _slimodule = new List<SelectListItem>(_modules.Count());
        _slimodule.Add(new SelectListItem { Text = "無", Value = "" });
        foreach (Module _module in _modules)
        {
          _slimodule.Add(new SelectListItem { Text = _module.Name, Value = _module.Model });
        }
        ViewData.Add("Model", _slimodule);
        ViewData.Add("Type", TypeSelectList);
        ViewData.Add("ContentOrders", CommonModel.ContentOrders);
        return View("ManageDetails",category);
      }
    }