asp.net MVC进阶学习---HtmlHelper之GridView控件拓展(三)

using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Web;
   using System.Web.Mvc.Html;
   using System.Web.Mvc;
   using MvcTest.Code;
   using System.Web.UI;
   using System.IO;
  using System.Data;
 
  namespace MvcTest.Code
  {
      public static class GridViewHelper
      {
          public static string GridView<T>(this HtmlHelper helper, PageList<T> items, string[] columns, GridViewOption option)
          {
  if (columns == null)
  {
      columns = typeof(T).GetProperties().Select(p => p.Name).ToArray<string>();
  }
 
  if (option.Headers == null)
  {
      option.Headers = columns;
  }
  else
  {
      if (option.Headers.Length != columns.Length)
      {
          option.Headers = columns;
      }
  }
 
  HtmlTextWriter writer = new HtmlTextWriter(new StringWriter());
  writer.RenderBeginTag(HtmlTextWriterTag.Table);
 
  //标题
  RenderHeander<T>(helper, writer, columns, option);
 
  //添加数据行
  RenderRow<T>(helper, writer, items, columns, option);
 
  //添加分页
  RenderPageList<T>(helper, writer, items, columns, option);
 
  return writer.InnerWriter.ToString(); ;
          }

          /// <summary>
          /// 添加表头行
          /// </summary>
          /// <typeparam name="T"></typeparam>
          /// <param name="helper"></param>
          /// <param name="writer"></param>
          /// <param name="columns"></param>
          /// <param name="option"></param>
          /// <returns></returns>
          public static string RenderHeander<T>(this HtmlHelper helper, HtmlTextWriter writer, string[] columns, GridViewOption option)
          {
  writer.RenderBeginTag(HtmlTextWriterTag.Tr);
  for (int i = 0; i < option.Headers.Length;i++ )
  {
      writer.AddAttribute("id",columns[i]);
      writer.AddAttribute("name", columns[i]);
      writer.RenderBeginTag(HtmlTextWriterTag.Th);
      writer.Write(option.Headers[i]);
      writer.RenderEndTag();
  }
 
  //如果有编辑或删除列，则要在原有列的基础上加一列
  if (option.IsEidt || option.IsDelete)
  {
      writer.RenderBeginTag(HtmlTextWriterTag.Th);
      writer.RenderEndTag();
  }
  writer.RenderEndTag();
  return writer.InnerWriter.ToString();
          }
 
          /// <summary>
          /// 添加数据行
          /// </summary>
          /// <param name="helper"></param>
          /// <param name="writer"></param>
          /// <param name="item"></param>
          /// <param name="columns"></param>
          /// <param name="option"></param>
          /// <returns></returns>
          public static string RenderRow<T>(this HtmlHelper helper, HtmlTextWriter writer, PageList<T> items, string[] columns, GridViewOption option)
          {
  string value = null;
  foreach (var item in items)
  {
      writer.RenderBeginTag(HtmlTextWriterTag.Tr);
      for (int i = 0; i < columns.Length; i++)
      {
          writer.RenderBeginTag(HtmlTextWriterTag.Td);
         value = typeof(T).GetProperty(columns[i]).GetValue(item, null).ToString();
         if (i == 0)
         {
 writer.AddAttribute("type", "hidden");
 writer.AddAttribute("id",items.IdentityName);
 writer.AddAttribute("name", items.IdentityName);
 writer.AddAttribute("value", typeof(T).GetProperty(items.IdentityName).GetValue(item, null).ToString());
 writer.RenderBeginTag(HtmlTextWriterTag.Input);
 writer.RenderEndTag();
 writer.Write(value.Length > 20 ? value.Substring(0, 20) : value);
         }
         else
         {
 writer.Write(value.Length > 20 ? value.Substring(0, 20) : value);
         }
         //writer.Write(value);
         writer.RenderEndTag();
     }
     if (option.IsEidt || option.IsDelete)
     {
         writer.RenderBeginTag(HtmlTextWriterTag.Td);
         if (option.IsEidt)
         {
 //writer.Write(helper.ActionLink(option.EditButton, null, null, new { @class = "Edit_Link" }) + "   ");
 writer.Write("<a href='#' class='Edit_Link'>编辑</a>&nbsp;&nbsp;&nbsp;");
         }
         if (option.IsDelete)
         {
 writer.Write(helper.ActionLink(option.DeleteButton, option.DeleteAction, new { controller = option.DeleteController, id = typeof(T).GetProperty(items.IdentityName).GetValue(item, null).ToString() }));
         }
 
         writer.RenderEndTag();
     }
     writer.RenderEndTag();
 }
 return writer.InnerWriter.ToString();
         }
 
 
         /// <summary>
         /// 添加分页
         /// </summary>
         /// <param name="helper"></param>
         /// <param name="writer"></param>
         /// <param name="option"></param>
         /// <returns></returns>
         public static string RenderPageList<T>(this HtmlHelper helper, HtmlTextWriter writer, PageList<T> items, string[] columns, GridViewOption option)
         {
 writer.RenderBeginTag(HtmlTextWriterTag.Tr);
 if (option.IsEidt || option.IsDelete)
 {
     writer.AddAttribute("colspan", (option.Headers.Length + 1).ToString());
 }
 else
 {
     writer.AddAttribute("colspan", (option.Headers.Length).ToString());
 }
 writer.AddAttribute("align", "center");
 writer.RenderBeginTag(HtmlTextWriterTag.Td);
 writer.Write(helper.ActionLink("首页", items.Action, new { controller = items.Controller, pageIndex = 1 }) + "&nbsp;&nbsp;&nbsp;&nbsp;");
 writer.Write(helper.ActionLink("上一页", items.Action, new { controller = items.Controller, pageIndex = items.Page.PageIndex - 1 }) + "&nbsp;&nbsp;&nbsp;&nbsp;");
 writer.Write(items.Page.PageIndex + "/" + items.Page.PageCount + "页&nbsp;&nbsp;&nbsp;&nbsp;");
 writer.Write(helper.ActionLink("下一页", items.Action, new { controller = items.Controller, pageIndex = items.Page.PageIndex + 1 }) + "&nbsp;&nbsp;&nbsp;&nbsp;");
 writer.Write(helper.ActionLink("尾页", items.Action, new { controller = items.Controller, pageIndex = items.Page.PageCount }) + "&nbsp;&nbsp;&nbsp;&nbsp;");
 writer.RenderEndTag();
 writer.RenderEndTag();
 writer.RenderEndTag();
 
 //构建隐藏表单
 writer.AddStyleAttribute("display","none");
 writer.RenderBeginTag(HtmlTextWriterTag.Div);
 writer.AddAttribute("id","form0");
 writer.AddAttribute("action","/Home/Update");
 writer.AddAttribute("method","post");
 writer.RenderBeginTag(HtmlTextWriterTag.Form);
 foreach (string column in columns)
 {
     writer.AddAttribute("type","hidden");
     writer.AddAttribute("id", column);
     writer.AddAttribute("name", column);
     writer.AddAttribute("value", "");
     writer.RenderBeginTag(HtmlTextWriterTag.Input);
     writer.RenderEndTag();
 }
 writer.RenderEndTag();
 writer.RenderEndTag();
 
 return writer.InnerWriter.ToString();
         }
     }
 }