发布于 2017-09-03 00:45:57 | 136 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的精品教程,程序狗速度看过来!

ASP.NET

ASP.NET 是.NET FrameWork的一部分,是一项微软公司的技术,是一种使嵌入网页中的脚本可由因特网服务器执行的服务器端脚本技术,它可以在通过HTTP请求文档时再在Web服务器上动态创建它们。 指 Active Server Pages(动态服务器页面) ,运行于 IIS(Internet Information Server 服务,是Windows开发的Web服务器)之中的程序 。


这篇文章主要为大家详细介绍了asp.net webform自定义分页控件,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

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。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持PHPERZ。



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