ASP.NET 翻頁後繼續維持排序

要實現翻頁後繼續排序,實現這樣的效果:

比如共15筆記錄，每頁顯示10條

則排序時:第一頁將前10條記錄排序，翻第二頁時後五條再單獨排序.

要注意以下幾點:

1.如果資料很多,最好不要把資料集放到快取中(viewstate),影響效能

2. ViewState中存放上次是哪個e.expression並且存放此e.expression是升序還是降序

範例如下:

1.現有的排序事件是這樣寫的,這個是點擊上面排序標題時用:

private void grdProjTrace_SortCommand(object source, DataGridSortCommandEventArgs e)
{
this.grdProjTrace.CurrentPageIndex = 0;
DataView dv = 得到資料代碼;
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.下面這個方法是自己寫的，翻頁事件中呼叫。

private void ChangePageDataBind()
{
DataView dv = 得到資料代碼;
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();
}

上面兩個方法只要修改要排序的欄位名，就可以直接呼叫了.

1、方法很簡單實用,這裡就不說了。

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}
}