GridView中的合并单元格的技术实现原理

///<summary>
///合并行(普通列)
///</summary>
///<paramname=“gv”>所对应的GridView对象</param>
///<paramname=“columnIndex”>所对应要合并的列的索引</param>
publicstaticvoidUnitCell(GridViewgv,intcolumnIndex)
{
inti;
stringlastType;
intlastCell;
if(gv.Rows.Count>0)
{
lastType=gv.Rows[0].Cells[columnIndex].Text;
gv.Rows[0].Cells[columnIndex].RowSpan=1;
lastCell=0;
}

for(i=1;i<gv.Rows.Count;i++)
{
if(gv.Rows[i].Cells[columnIndex].Text==lastType)
{
gv.Rows[i].Cells[columnIndex].Visible=false;
gv.Rows[lastCell].Cells[columnIndex].RowSpan++;
}
else
{
lastType=gv.Rows[i].Cells[columnIndex].Text;
lastCell=i;
gv.Rows[i].Cells[columnIndex].RowSpan=1;
}
}
}
///<summary>
///合并行(模板列)
///</summary>
///<paramname=“gv”>所对应的GridView对象</param>
///<paramname=“columnIndex”>所对应要合并的列的索引</param>
///<paramname=“lblName”>模板列里面Lable的Id</param>
publicstaticvoidUnitCell(GridViewgv,intcolumnIndex,stringlblName)
{
inti;
stringlastType;
intlastCell;
if(gv.Rows.Count>0)
{
lastType=(gv.Rows[0].Cells[columnIndex].FindControl(lblName)asLabel).Text;
gv.Rows[0].Cells[columnIndex].RowSpan=1;
lastCell=0;
for(i=1;i<gv.Rows.Count;i++)
{
if((gv.Rows[i].Cells[columnIndex].FindControl(lblName)asLabel).Text==lastType)
{
gv.Rows[i].Cells[columnIndex].Visible=false;
gv.Rows[lastCell].Cells[columnIndex].RowSpan++;
}
else
{
lastType=(gv.Rows[i].Cells[columnIndex].FindControl(lblName)asLabel).Text;
lastCell=i;
gv.Rows[i].Cells[columnIndex].RowSpan=1;
}
}
}
}