（转）AspNetPager查询分页问题（点击页码，不再是查询后的数据集）viewstate解决

public string SQL = "select * from Memorandum";

      protected void Page_Load(object sender, EventArgs e)

      {

          if (!IsPostBack)

          {

              ViewState["SQL"] = SQL;

              BindData();

          }

          if (Request.QueryString["MId"] != null)

          {

              Delete(int.Parse(Request.QueryString["MId"].ToString()));

          }

      }

 

      protected void AspNetPager1_PageChanged(object sender, EventArgs e)

      {

          BindData();

      }

      

      void BindData()

      {

          PagedDataSource pds = new PagedDataSource();

          IList<MemorandumInfo> Infos = new DAL.Memorandum().GetAllMemorandumsBySQL(ViewState["SQL"].ToString());

 

          pds.DataSource = Infos;

          pds.AllowPaging = true;

          pds.PageSize = 10;//取控件的分页大小

          pds.CurrentPageIndex = this.AspNetPager1.CurrentPageIndex - 1;//显示当前页

          //设置控件

          this.AspNetPager1.RecordCount = Infos.Count;//记录总数

          this.AspNetPager1.PageSize = 10;

          Repeater1.DataSource = pds;

          Repeater1.DataBind();

      }

      void Delete(int MId)

      {

          new Memorandum().DeleteMemorandum(MId);

          Response.Write("<script>alert('成功删除该条备忘信息');location='?';</script>");

      }

      /// <summary>

      /// 查询

      /// </summary>

      /// <param name="sender"></param>

      /// <param name="e"></param>

 

      protected void Button1_Click(object sender, EventArgs e)

      {

          if (DropDownList1.SelectedValue == "0")

          {

              ViewState["SQL"] = "select * from Memorandum";

              BindData();

          }

          else

          {

              ViewState["SQL"] = "SELECT   MId, MemoTitle, MemoContent, MemoStartTime, MemoEndTime FROM  Memorandum WHERE (MemoEndTime - NOW() <=7)";

              BindData();

          }

      }

  }

ViewState 用来跟踪和保存控件的状态信息。否则这些信息可能会丢失，原因可能是这些值不随着 form 回发，或者根本就不在 page 的 html 中。
ViewState 中保存着代码中改变的控件属性，通过代码绑定到控件的任何数据，以及由用户操作触发，回发的任何更改。
ViewState 还提供了一个状态包(StateBag), 这是一个特殊的集合或字典(collection or dictionary), 可以用来保存，通过一个 key 来恢复任意的对象或者值。

赋值：ViewState[key] = value;

取值：value = ViewState[key];