要想實(shí)現(xiàn)翻頁(yè)后繼續(xù)排序,實(shí)現(xiàn)這樣的效果:
比如共 15筆記錄,每頁(yè)顯示10條
則排序時(shí):第一頁(yè)將前10條記錄排序,翻第二頁(yè)時(shí)后五條再單獨(dú)排序.
要注意以下幾點(diǎn):
1.如果數(shù)據(jù)很多,最好不要把數(shù)據(jù)集放到緩存中(viewstate),影響性能
2. ViewState中存放上次是哪個(gè)e.expression并且存放此e.expression是升序還是降序
示例如下:
1.現(xiàn)有的排序事件是這樣寫的,這個(gè)是點(diǎn)擊上面排序標(biāo)題時(shí)用:
private void grdProjTrace_SortCommand(object source, DataGridSortCommandEventArgs e)
{
this.grdProjTrace.CurrentPageIndex = 0;
DataView dv = 得到數(shù)據(jù)代碼;
string strSort = "";
string strOrder ="";//排序方式。0,降序,1升序
if(ViewState["SortExpresstion"] != null)
{
strSort = ViewState["SortExpresstion"].ToString();
strSort = strSort.Substring(0,strSort.Length -1);
strOrder = ViewState["SortExpresstion"].ToString();
strOrder = strOrder.Substring(strOrder.Length -1);
}
if(e.SortExpression == "CustomerName")
{
if(strSort != "CustomerName")
{
this.ViewState["SortExpresstion"] = ustomerName0";
dv.Sort = "CustomerName DESC";
}
else
{
if(strOrder == "0")
{
this.ViewState["SortExpresstion"] = "CustomerName1";
dv.Sort = "CustomerName ASC";
}
else
{
this.ViewState["SortExpresstion"] = "CustomerName0";
dv.Sort = "CustomerName DESC";
}
}
}
if(e.SortExpression == "fullName")
{
if(strSort != "fullName")
{
this.ViewState["SortExpresstion"] = "fullName0";
dv.Sort = "fullName DESC";
}
else
{
if(strOrder == "0")
{
this.ViewState["SortExpresstion"] = "fullName1";
dv.Sort = "fullName ASC";
}
else
{
this.ViewState["SortExpresstion"] = "fullName0";
dv.Sort = "fullName DESC";
}
}
}
this.grdProjTrace.DataSource = dv;
this.grdProjTrace.DataBind();
}
>
2.下面這個(gè)方法是自己寫的,翻頁(yè)事件中調(diào)用。
private void ChangePageDataBind()
{
DataView dv = 得到數(shù)據(jù)代碼;
string strSort = "";
string strOrder ="";//排序方式。0,降序,1升序
if(ViewState["SortExpresstion"] != null)
{
strSort = ViewState["SortExpresstion"].ToString();
strSort = strSort.Substring(0,strSort.Length -1);
strOrder = ViewState["SortExpresstion"].ToString();
strOrder = strOrder.Substring(strOrder.Length -1);
}
if(this.ViewState["SortExpresstion"] != null)
{
if(strSort == "CustomerName")
{
if(strOrder == "1")
{
this.ViewState["SortExpresstion"] = "CustomerName1";
dv.Sort = "CustomerName ASC";
}
else
{
this.ViewState["SortExpresstion"] = "CustomerName0";
dv.Sort = "CustomerName DESC";
}
}
}
if(this.ViewState["SortExpresstion"] != null)
{
if(strSort == "fullName")
{
if(strOrder == "1")
{
this.ViewState["SortExpresstion"] = "fullName1";
dv.Sort = "fullName ASC";
}
else
{
this.ViewState["SortExpresstion"] = "fullName0";
dv.Sort = "fullName DESC";
}
}
}
this.grdProjTrace.DataSource = dv;
this.grdProjTrace.DataBind();
}
上面兩方法只要修改要排序的字段名,就可以直接調(diào)用了.
1、方法很簡(jiǎn)單實(shí)用,這里就不說了。
2、方法是這樣用的:
private void grdProjTrace_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
try
{
try
{
this.grdProjTrace.CurrentPageIndex = e.NewPageIndex;
}
catch
{
this.grdProjTrace.CurrentPageIndex = 0;
}
this.ChangePageDataBind();
}
catch(System.Exception errWS)
{
//異常
}
}