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ASP.NET 翻页后继续维持排序

2019-09-13 19:58:04来源:励志吧0次阅读

要想实现翻页后继续排序,实现这样的效果:

比如共 15笔记录,每页显示10条

则排序时:第一页将前10条记录排序,翻第二页时后五条再单独排序.

要注意以下几点:

1.如果数据很多,最好不要把数据集放到缓存中(viewstate),影响性能

2. ViewState中存放上次是哪个e.expression并且存放此e.expression是升序还是降序

示例如下:

1.现有的排序事件是这样写的,这个是点击上面排序标题时用:

private void grdProjTrace_SortCommand(object source, DataGridSortCommandEventArgs e)

{

this.grdProjTrace.CurrentPageIndex = 0;

DataView dv = 得到数据代码;

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.下面这个方法是自己写的,翻页事件中调用。

private void ChangePageDataBind()

{

DataView dv = 得到数据代码;

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();

}

上面两方法只要修改要排序的字段名,就可以直接调用了.

1、方法很简单实用,这里就不说了。

2、方法是这样用的:

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)

{

//异常

}

}查看本文来源

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