asp.net webform 自定义分页控件

做web开发一直用到分页控件，自己也动手实现了个，使用用户自定义控件。

翻页后数据加载使用委托，将具体实现放在在使用分页控件的页面进行注册。

有图有真相，给个直观的认识：



自定义分页控件前台代码：

<style type="text/css">
.pager-m-l {
margin-left: 10px;
}

.pager {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 14px;
color: #333;
background-color: #fff;
text-align: center;
border: 1px solid #eee;
border-radius: 5px;
height: 30px;
line-height: 30px;
margin: 10px auto;
width: 650px;
}

.font-blue {
color: #5bc0de;
}

.pager a {
color: #5bc0de;
text-decoration: none;
}

.pager a.gray {
color: #808080;
}

.pager-num {
width: 30px;
text-align: center;
}

.pager-form-control {
color: #555;
background-color: #fff;
background-image: none;
border: 1px solid #ccc;
border-radius: 4px;
-webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
-webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
-o-transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
padding: 2px 0px;
margin: 0px 2px;
}

.pager-form-control:focus {
border-color: #66afe9;
outline: 0;
-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
}

.btn {
display: inline-block;
padding: 2px;
font-weight: normal;
text-align: center;
white-space: nowrap;
vertical-align: middle;
-ms-touch-action: manipulation;
touch-action: manipulation;
cursor: pointer;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
background-image: none;
border: 1px solid transparent;
border-radius: 4px;
}

.btn-default {
color: #333;
background-color: #fff;
border-color: #ccc;
}
</style>
<div class="pager">
<span>当前<asp:Label runat="server" ID="labCurrentPageIndex" CssClass="font-blue"></asp:Label>/<asp:Label runat="server" CssClass="font-blue" ID="labTotalNumberOfPages"></asp:Label>页</span>
<span class="pager-m-l">共<asp:Label runat="server" CssClass="font-blue" ID="labRecordCount"></asp:Label>条记录</span>
<span class="pager-m-l">
<asp:LinkButton runat="server" ID="labFirstPage" OnClick="labFirstPage_Click">首页</asp:LinkButton>
|
<asp:LinkButton runat="server" ID="labPreviousPage" OnClick="labPreviousPage_Click">上一页</asp:LinkButton>
|<asp:LinkButton runat="server" ID="labNextPage" OnClick="labNextPage_Click">下一页</asp:LinkButton>
|<asp:LinkButton runat="server" ID="labLastPage" OnClick="labLastPage_Click">尾页</asp:LinkButton>
</span>
<span class="pager-m-l">跳至<asp:TextBox runat="server" ID="txtPageNum" CssClass="pager-form-control pager-num">1</asp:TextBox>页
<asp:Button runat="server" Text="GO" ID="btnGo" CssClass="btn btn-default" OnClick="btnGo_Click" /></span>
<span class="pager-m-l">
<asp:DropDownList runat="server" ID="ddlPageSize" CssClass="pager-form-control" AutoPostBack="true" OnSelectedIndexChanged="ddlPageSize_SelectedIndexChanged">
<asp:ListItem Text="10" Value="10"></asp:ListItem>
<asp:ListItem Text="20" Value="20"></asp:ListItem>
<asp:ListItem Text="30" Value="30"></asp:ListItem>
<asp:ListItem Text="50" Value="50"></asp:ListItem>
<asp:ListItem Text="100" Value="100"></asp:ListItem>
</asp:DropDownList>条/每页</span>
</div>

自定义分页控件后台代码：

private const string viewStateCurrentPageIndex = "CurrentPageIndex";
private const string viewStateRecordCount = "RecordCount";

public delegate void PageChangedHandle();
public event PageChangedHandle OnPageChanged;

public int PageSize
{
get
{
return Convert.ToInt32(ddlPageSize.SelectedValue);
}
}

public int CurrentPageIndex
{
set
{
ViewState[viewStateCurrentPageIndex] = value;
}
get
{
if (ViewState[viewStateCurrentPageIndex] == null)
{
ViewState[viewStateCurrentPageIndex] = 1;
}

return Convert.ToInt32(ViewState[viewStateCurrentPageIndex]);
}
}
public int RecordCount
{
get
{
if (ViewState[viewStateRecordCount] == null)
{
ViewState[viewStateRecordCount] = 0;
}

return Convert.ToInt32(ViewState[viewStateRecordCount]);
}
set
{
ViewState[viewStateRecordCount] = value;
}
}
private int TotalNumberOfPages
{
get
{
return RecordCount % PageSize == 0 ? RecordCount / PageSize : (RecordCount / PageSize) + 1;
}
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

}
}

protected void labFirstPage_Click(object sender, EventArgs e)
{
CurrentPageIndex = 1;

this.DataBind();
}

protected void labPreviousPage_Click(object sender, EventArgs e)
{
CurrentPageIndex -= 1;

this.DataBind();
}

protected void labNextPage_Click(object sender, EventArgs e)
{
CurrentPageIndex += 1;

this.DataBind();
}

protected void labLastPage_Click(object sender, EventArgs e)
{
CurrentPageIndex = TotalNumberOfPages;

this.DataBind();
}

protected void btnGo_Click(object sender, EventArgs e)
{
int pageNum = 1;
bool isNum = Int32.TryParse(txtPageNum.Text, out pageNum);
if (isNum)
{
CurrentPageIndex = Math.Min(pageNum, TotalNumberOfPages);
}

this.DataBind();
}

protected void ddlPageSize_SelectedIndexChanged(object sender, EventArgs e)
{
CurrentPageIndex = 1;

this.DataBind();
}

protected override void DataBind(bool raiseOnDataBinding)
{
BindPager();
base.DataBind(raiseOnDataBinding);

if (OnPageChanged != null)
{
OnPageChanged();
}
}

private void BindPager()
{
labCurrentPageIndex.Text = CurrentPageIndex.ToString();
labTotalNumberOfPages.Text = TotalNumberOfPages.ToString();
labRecordCount.Text = RecordCount.ToString();

SetNavigateEnabled();
}

private void SetNavigateEnabled()
{
txtPageNum.Text = CurrentPageIndex.ToString();
labFirstPage.Enabled = true;
labPreviousPage.Enabled = true;
labNextPage.Enabled = true;
labLastPage.Enabled = true;

labFirstPage.CssClass = "font-blue";
labPreviousPage.CssClass = "font-blue";
labNextPage.CssClass = "font-blue";
labLastPage.CssClass = "font-blue";

if (CurrentPageIndex == 1)
{
labFirstPage.Enabled = false;
labPreviousPage.Enabled = false;

labFirstPage.CssClass = "gray";
labPreviousPage.CssClass = "gray";
}
if (CurrentPageIndex == TotalNumberOfPages)
{
labNextPage.Enabled = false;
labLastPage.Enabled = false;

labNextPage.CssClass = "gray";
labLastPage.CssClass = "gray";
}
if (RecordCount == 0)
{
labFirstPage.Enabled = false;
labPreviousPage.Enabled = false;

labFirstPage.CssClass = "gray";
labPreviousPage.CssClass = "gray";

labNextPage.Enabled = false;
labLastPage.Enabled = false;

labNextPage.CssClass = "gray";
labLastPage.CssClass = "gray";
}
}

当前页码、总共多少条记录使用ViewState记录状态信息，因为导航控件会引起回发刷新。
分页后的数据加载，使用事件。

事件的具体实现放在使用分页控件的具体页面中，进行事件的注册。

测试分页控件的前台页面：

<div style="margin-bottom:10px;">
text:
<asp:TextBox ID="txtContent" runat="server"></asp:TextBox>
<asp:Button ID="btnQuery" runat="server" Text="查 询" OnClick="btnQuery_Click"/>
</div>
<div>
<asp:GridView ID="gvList" runat="server" Width="99%" AutoGenerateColumns="true"></asp:GridView>
<uc1:PagerControl runat="server" ID="Pager" />
</div>

测试分页控件的后台代码：

private const string dtSourceViewStateKey = "dtSourceViewStateKey";

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData(true);

}
Pager.OnPageChanged += OnPageChanged;
}

private void BindData(bool bindRecordCount)
{
DataTable dtSource = GetDataSource();

var source = dtSource.AsEnumerable();
if (!string.IsNullOrEmpty(txtContent.Text.Trim()))
{
source = source.Where(w => w.Field<string>("text").Contains(txtContent.Text.Trim()));
}

if (bindRecordCount)
{
Pager.RecordCount = source.Count();
Pager.CurrentPageIndex = 1;
Pager.DataBind();
}

gvList.DataSource = source
.Skip((Pager.CurrentPageIndex - 1) * Pager.PageSize)
.Take(Pager.PageSize)
.Select(r => new { id = r["id"].ToString(), text = r["text"].ToString() })
.ToList();
gvList.DataBind();
}

private void OnPageChanged()
{
BindData(false);
}

private DataTable InitDataTable()
{
DataTable dtSource = new DataTable();
DataColumn id = new DataColumn("id");
id.AutoIncrement = true;
id.AutoIncrementSeed = 1;

dtSource.Columns.Add(id);
dtSource.Columns.Add("text");

for (int i = 1; i <= 1000; i++)
{
DataRow dr = dtSource.NewRow();
dr["text"] = "内容" + i;

dtSource.Rows.Add(dr);
}

return dtSource;
}

private DataTable GetDataSource()
{
if (ViewState[dtSourceViewStateKey] == null)
{
ViewState[dtSourceViewStateKey] = InitDataTable();
}

return ViewState[dtSourceViewStateKey] as DataTable;
}

protected void btnQuery_Click(object sender, EventArgs e)
{
BindData(true);
}

在Page_Load中注册翻页后的事件。