機車物語

當用ajax時

這時

如果在裡面放一個要換頁的網頁

真的很麻煩

所以我選擇放一個iframe來減少資料庫的存取

但是不想要postback的狀況  

決定用viewstate來處理

以下只是一小部份

但是看懂的人已經足夠了

protected override void LoadViewState(object savedState)

   {

       if (savedState != null)

       {

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

           var listItem = (new JavaScriptSerializer()).Deserialize<ListItem[]>(myState[2].ToString());

           this.ddlPage.Items.AddRange(listItem);

           this.laTotal.Text = ((DataTable)myState[1]).Rows.Count.ToString();

           ViewState["xx1"] = myState[1];

           ViewState["xx2"] = myState[2];

       }

   }

   protected override object SaveViewState()

   {

       if (IsPostBack && "1".Equals(this.ddlPage.SelectedValue) && "20".Equals(this.ddlCount.SelectedValue))

       {

           setTable("ddlCount");

       }

       return new object[]{

           base.SaveViewState(),

           ViewState["xx1"],

           ViewState["xx2"],

           this.ddlPage.SelectedValue,

           this.ddlCount.SelectedValue          

       };

   }

   protected void ddlPage_SelectedIndexChanged(object sender, EventArgs e)

   {

       if (IsPostBack)

       {

           setTable(((DropDownList)sender).ID);

       }

   }

   protected void ddlCount_SelectedIndexChanged(object sender, EventArgs e)

   {

       if (IsPostBack)

       {

           setTable(((DropDownList)sender).ID);

       }

   }