GridView結合ASPNETPager的分頁程式碼
這兩天終於把AspNetPager分頁控制元件學會了，以前寫的分頁程式碼很多也很複雜，用上分頁控制元件後，程式簡潔了許多。剛開始學習程式設計的時候我以為程式碼越多越好，如果一個程式有十幾萬行程式碼，那肯定挺牛，而現在我不這麼認為了，如果同樣實現一個功能，程式碼能夠做到越簡潔越好。
花了兩天時間，將安國珠寶的分頁改成AspNetPager控制元件分頁，不但少了很多行的程式碼，功能方面也比我原來寫的還要強大很多，那為什麼自己還想著把以前的分頁程式碼記錄下來呢？因為我覺得以前的程式碼並非一無是處，留下來供以後參考還是可以的。當然，在稍後我會把AspNetPager控制元件的使用方法和下載地址釋出出來，讓更多的朋友開發時可以更加快捷。
前臺程式碼：
<asp:GridView ID="GV_News" runat="server" AutoGenerateColumns="False" CellPadding="1" Width="100%" Height="35px" BorderStyle="None" BorderWidth="0px" ShowHeader="False" GridLines="None" PageSize="20" >
<Columns>
<asp:TemplateField >
<ItemTemplate>
<ul>
<li>
<span class="time"><asp:Label ID="lab_date" runat="server" Text='<%# Bind("欄位名") %>'></asp:Label></span>
</li>
</ul>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<PagerSettings Visible="False" />
<EmptyDataTemplate>
暫時沒有任何新聞資訊！
</EmptyDataTemplate>
</asp:GridView>
<ul>
<li>共有 <asp:Label ID="lab_Totally" runat="server" ForeColor="red"></asp:Label> 行記錄</li>
<li>當前第 <asp:Label ID="lab_Front" runat="server" ForeColor="red"><%=GV_News.PageIndex + 1%></asp:Label> 頁/共 <asp:Label ID="lab_all" runat="server"><%=GV_News.PageCount%></asp:Label> 頁 20 行/頁</li>
<li><asp:LinkButton ID="lkbt_first" runat="server" CommandArgument="first" OnClick="lkbt_first_Click">首 頁</asp:LinkButton></li>
<li><asp:LinkButton ID="lkbt_prev" runat="server" CommandArgument="prev" OnClick="lkbt_prev_Click">上一頁</asp:LinkButton></li>
<li><asp:LinkButton ID="lkbt_next" runat="server" CommandArgument="next" OnClick="lkbt_next_Click">下一頁</asp:LinkButton></li>
<li><asp:LinkButton ID="lkbt_last" runat="server" CommandArgument="last" OnClick="lkbt_last_Click">尾 頁</asp:LinkButton></li>
<li>跳轉至第 <asp:DropDownList ID="ddl_tz" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddl_tz_SelectedIndexChanged"></asp:DropDownList></li>
<li>
</ul>
後臺程式碼：
private void BindNews()
{
try
{
SqlConnection conn =new SqlConnection(ConfigurationManager.ConnectionStrings["DBpath"].ConnectionString);
conn.Open();
string sql = "select * from 表名";
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds, "temp");
GV_News.DataSource = ds.Tables["news"].DefaultView;
GV_News.AllowPaging = true;
GV_News.PageSize = 20;
int num = ds.Tables[0].Rows.Count;
lab_Totally.Text = Convert.ToString(num);
GV_News.DataBind();//繫結datalist
if (num < 21)
{//假如記錄條數少於21條，所有分頁不可用。
lkbt_first.Enabled = false;
lkbt_prev.Enabled = false;
lkbt_next.Enabled = false;
lkbt_last.Enabled = false;
}
else
{
lkbt_first.Enabled = true;
lkbt_prev.Enabled = true;
lkbt_next.Enabled = true;
lkbt_last.Enabled = true;
}
if (GV_News.PageIndex == 0)
{ //假如在首頁，設定“首頁”和“上一頁”按鈕不可用
lkbt_first.Enabled = false;
lkbt_prev.Enabled = false;
}
else
{
lkbt_first.Enabled = true;
lkbt_prev.Enabled = true;
}
if (GV_News.PageIndex == GV_News.PageCount - 1)
{//假如在末頁，設定“下一頁”和“尾頁”按鈕不可用
lkbt_next.Enabled = false;
lkbt_last.Enabled = false;
}
else
{
lkbt_next.Enabled = true;
lkbt_last.Enabled = true;
}
}
catch (Exception ex)
{
//提示錯誤資訊
}
finally
{
conn.Close();
}
}
}
protected void lkbt_first_Click(object sender, EventArgs e)
{//首頁
switch (((LinkButton)sender).CommandArgument.ToString())
{
case "first"://“first”在“lb_sy”按鈕的CommandArgument屬性中設定
GV_News.PageIndex = 0;
break;
case "last":
GV_News.PageIndex = GV_News.PageCount - 1;
break;
case "prev":
GV_News.PageIndex = GV_News.PageIndex - 1;
break;
case "next":
GV_News.PageIndex = GV_News.PageIndex + 1;
break;
}
BindNews();
}
protected void lkbt_prev_Click(object sender, EventArgs e)
{//上一頁
switch (((LinkButton)sender).CommandArgument.ToString())
{
case "first":
GV_News.PageIndex = 0;
break;
case "last":
GV_News.PageIndex = GV_News.PageCount - 1;
break;
case "prev":
GV_News.PageIndex = GV_News.PageIndex - 1;
break;
case "next":
GV_News.PageIndex = GV_News.PageIndex + 1;
break;
}
BindNews();
}
protected void lkbt_next_Click(object sender, EventArgs e)
{//下一頁
switch (((LinkButton)sender).CommandArgument.ToString())
{
case "first":
GV_News.PageIndex = 0;
break;
case "last":
GV_News.PageIndex = GV_News.PageCount - 1;
break;
case "prev":
GV_News.PageIndex = GV_News.PageIndex - 1;
break;
case "next":
GV_News.PageIndex = GV_News.PageIndex + 1;
break;
}
BindNews();
}
protected void lkbt_last_Click(object sender, EventArgs e)
{//尾頁
switch (((LinkButton)sender).CommandArgument.ToString())
{
case "first":
GV_News.PageIndex = 0;
break;
case "last":
GV_News.PageIndex = GV_News.PageCount - 1;
break;
case "prev":
GV_News.PageIndex = GV_News.PageIndex - 1;
break;
case "next":
GV_News.PageIndex = GV_News.PageIndex + 1;
break;
}
BindNews();
}
protected void ddl_tz_SelectedIndexChanged(object sender, EventArgs e)
{//跳轉至第幾頁
int CurPage;
//判斷是否有分頁的請求；
///
if (ddl_tz.SelectedValue != null)
{
CurPage = Convert.ToInt32(ddl_tz.SelectedValue);
}
else
{
CurPage = 1;
}
//設定當前頁；
GV_News.PageIndex = CurPage - 1;
BindNews();
}