标签:blog color os io ar for 数据 art 问题
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];
(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
标签:blog color os io ar for 数据 art 问题
原文地址:http://www.cnblogs.com/wanshutao/p/3941286.html