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.expressi
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["sortexpressti != 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["sortexpressti = ustomername0";
dv.sort = "customername desc";
}
else
{
if(strorder == "0")
{
this.viewstate["sortexpressti = "customername1";
dv.sort = "customername asc";
}
else
{
this.viewstate["sortexpressti = "customername0";
dv.sort = "customername desc";
}
}
}
if(e.sortexpression == "fullname")
{
if(strsort != "fullname")
{
this.viewstate["sortexpressti = "fullname0";
dv.sort = "fullname desc";
}
else
{
if(strorder == "0")
{
this.viewstate["sortexpressti = "fullname1";
dv.sort = "fullname asc";
}
else
{
this.viewstate["sortexpressti = "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["sortexpressti != 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["sortexpressti != null)
{
if(strsort == "customername")
{
if(strorder == "1")
{
this.viewstate["sortexpressti = "customername1";
dv.sort = "customername asc";
}
else
{
this.viewstate["sortexpressti = "customername0";
dv.sort = "customername desc";
}
}
}
if(this.viewstate["sortexpressti != null)
{
if(strsort == "fullname")
{
if(strorder == "1")
{
this.viewstate["sortexpressti = "fullname1";
dv.sort = "fullname asc";
}
else
{
this.viewstate["sortexpressti = "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
}
}