機車物語

使用GridView的換頁時

要注意一些事

這樣的目的主要是減少網頁對伺服器的quary

程式碼如下：

   protected void Page_Init(object sender, EventArgs e)

   {

       if (!IsPostBack)

       {

           getData();

       }

   }

   protected void gvUser_PageIndexChanging(object sender, GridViewPageEventArgs e)

   {

       this.gvUser.SelectedIndex = -1;

       this.gvUser.PageIndex = e.NewPageIndex;

       this.gvUser.DataSource = ViewState["ajaxCA0100"];

       this.gvUser.DataBind();

   }

   protected void gvUser_SelectedIndexChanged(object sender, EventArgs e)

   {

       using (var dt = (DataTable)ViewState["xxx"])

       {

           var tR = dt.Select("使用者ID='" + this.gvUser.SelectedValue + "'");

           if (tR.Length > 0)

           {

               string s = "";

               for (int i = 1; i <= 4; i++)

               {

                   s += ",'" + tR[0][i].ToString() + "'";

               }

               csService.setScript(this, "getSelected('" + this.gvUser.SelectedValue + "'" + s + ");");

           }

       }

   }

   protected override void LoadViewState(object savedState)

   {

       if (savedState != null)

       {

           object[] myState = (object[])savedState;

           ViewState["ajaxCA0100"] = myState[1];

       }

   }

   protected override object SaveViewState()

   {

       return new object[]{

           base.SaveViewState(),

           ViewState["xxx"]

       };

   }