扩展GridView之个性分页（转载）

整天面对GridView的分页，早就厌烦了，下面就谈下如何给GridView扩展出个性的分页来，首先看看运行效果图：

下面谈下重要的实现的思路的实现代码：
实现思路和上文的Excel和Word导出是一样的，就是在GridView中添加行，首先声明以下控件，用于显示页次：第几页，共多少页，多少记录，首页，上一页，下一页，尾页
用于分页的控件
Label lblCurrentPage;
Label lblPageCount;
Label lblRowsCount;
LinkButton btnFirst;
LinkButton btnPrev;
LinkButton btnNext;
LinkButton btnLast;在GridView的OnInit方法中，初始化这些控件
在控件的Oninit方法初始化分页控件
protected override void OnInit(EventArgs e)
{
this.EnableViewState = true;

lblCurrentPage = new Label();
lblCurrentPage.ForeColor = ColorTranslator.FromHtml("#e78a29");
lblCurrentPage.Text = "1";

lblPageCount = new Label();
lblPageCount.Text = "1";

lblRowsCount = new Label();
lblRowsCount.ForeColor = ColorTranslator.FromHtml("#e78a29");

btnFirst = new LinkButton();
btnFirst.Text = "首页";
btnFirst.Command += new CommandEventHandler(NavigateToPage);
btnFirst.CommandName = "Pager";
btnFirst.CommandArgument = "First";

btnPrev = new LinkButton();
btnPrev.Text = "上一页";
btnPrev.Command += new CommandEventHandler(NavigateToPage);
btnPrev.CommandName = "Pager";
btnPrev.CommandArgument = "Prev";

btnNext = new LinkButton();
btnNext.Text = "下一页";
btnNext.Command += new CommandEventHandler(NavigateToPage);
btnNext.CommandName = "Pager";
btnNext.CommandArgument = "Next";

btnLast = new LinkButton();
btnLast.Text = "尾页";
btnLast.Command += new CommandEventHandler(NavigateToPage);
btnLast.CommandName = "Pager";
btnLast.CommandArgument = "Last";

base.OnInit(e);
}

然后是关键部分的代码，就是将这些控件如何添加到GridView中，通过在创建子控件的方式，如下：
在创建子控件的方法中添加分页控件
protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
{
int res = base.CreateChildControls(dataSource, dataBinding);
if (ShowToolBar)
{
try
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Pager, DataControlRowState.Normal);
TableCell c = new TableCell();
c.Width = Unit.Percentage(100);
c.ColumnSpan = this.Columns.Count;
row.Cells.Add(c);
TableCell cell1 = new TableCell();
Table table = new Table();
TableRow r = new TableRow();
table.Rows.Add(r);
table.Width = Unit.Percentage(100);
c.Controls.Add(table);
r.Cells.Add(cell1);
Literal l1 = new Literal();
l1.Text = "页次：";
cell1.Controls.Add(l1);
cell1.Wrap = false;
cell1.Controls.Add(lblCurrentPage);
l1 = new Literal();
l1.Text = "页/";
cell1.Controls.Add(l1);
cell1.Controls.Add(lblPageCount);
l1 = new Literal();
l1.Text = "页，共";
cell1.Controls.Add(l1);
cell1.Controls.Add(lblRowsCount);
l1 = new Literal();
l1.Text = "条记录";
cell1.HorizontalAlign = HorizontalAlign.Left;
cell1.Controls.Add(l1);
TableCell cell2 = new TableCell();
cell2.HorizontalAlign = HorizontalAlign.Right;
cell2.Wrap = false;

l1 = new Literal();
l1.Text = " [";
cell2.Controls.Add(l1);
cell2.Controls.Add(btnFirst);
l1 = new Literal();
l1.Text = "] ";
cell2.Controls.Add(l1);

l1 = new Literal();
l1.Text = " [";
cell2.Controls.Add(l1);
cell2.Controls.Add(btnPrev);
l1 = new Literal();
l1.Text = "] ";
cell2.Controls.Add(l1);

l1 = new Literal();
l1.Text = " [";
cell2.Controls.Add(l1);
cell2.Controls.Add(btnNext);
l1 = new Literal();
l1.Text = "] ";
cell2.Controls.Add(l1);

l1 = new Literal();
l1.Text = " [";
cell2.Controls.Add(l1);
cell2.Controls.Add(btnLast);
l1 = new Literal();
l1.Text = "] ";
cell2.Controls.Add(l1);
r.Cells.Add(cell2);
this.Controls[0].Controls.AddAt(0, row);
}
catch
{
}
}
return res;
}下面就是处理分页的事件，类似于RowCommand
public void NavigateToPage(object sender, CommandEventArgs e)
{
btnFirst.Enabled = true;
btnPrev.Enabled = true;
btnNext.Enabled = true;
btnLast.Enabled = true;
switch (e.CommandArgument.ToString())
{
case "Prev":
if (this.PageIndex > 0)
{
this.PageIndex -= 1;

}
break;
case "Next":
if (this.PageIndex < (this.PageCount - 1))
{
this.PageIndex += 1;

}
break;
case "First":
this.PageIndex = 0;
break;
case "Last":
this.PageIndex = this.PageCount - 1;
break;
}
if (this.PageIndex == 0)
{
btnFirst.Enabled = false;
btnPrev.Enabled = false;
if (this.PageCount == 1)
{
btnLast.Enabled = false;
btnNext.Enabled = false;
}
}
else if (this.PageIndex == this.PageCount - 1)
{
btnLast.Enabled = false;
btnNext.Enabled = false;
}
OnBind();
}