用户自定义控件的应用

asp.net中的 用户自定义控件 特点 1：实现服用；2：方便创建（相对与组件）。 以下为一个分页导航条的sample, 接见于Webdiyer，相信很多人已经如雷贯耳了，我也不多介绍。本问只是简单的 练习之作，没有什么深奥的算法和架构。

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namespace GallonKit
{
 using System;
 using System.Data;
 using System.Drawing;
 using System.Web;
 using System.Web.UI.WebControls;
 using System.Web.UI.HtmlControls;

/// <summary>
 ///  PageBar 的摘要说明。
 /// </summary>
 
 public delegate void PageLocalBtn(uint index);

public class PageBar : System.Web.UI.UserControl
 {
  protected System.Web.UI.WebControls.LinkButton LinkButton1;
  protected System.Web.UI.WebControls.LinkButton btn_fistPage;
  protected System.Web.UI.WebControls.LinkButton btn_lastPage;
  protected System.Web.UI.WebControls.LinkButton btn_prePage;
  protected System.Web.UI.WebControls.LinkButton btn_nextPage;
  protected System.Web.UI.WebControls.Label lb_PageCount;
  protected System.Web.UI.WebControls.TextBox tb_pageIndex;
  protected System.Web.UI.WebControls.LinkButton btn_local;
  public PageLocalBtn LocalBtnClick;
  

private void Page_Load(object sender, System.EventArgs e)
  {
// 在此处放置用户代码以初始化页面
  
  }

private bool IsUint(string strInt)
  {
try
{
 uint.Parse(strInt);
}
catch(Exception e)
{
 return false;
}

return true;

  }

  
  public uint pageIndex
  {
get{
 if (this.IsUint(this.tb_pageIndex.Text.Trim()))
return uint.Parse(this.tb_pageIndex.Text.Trim());
 return 0;
 }

set{
 if (this.IsUint(value.ToString()))
  this.tb_pageIndex.Text = value.ToString();
 else
  throw new System.Exception("页数范围不正确！");

}
  }

public uint pageCount
  {
get
{
 object obj = ViewState["PageCount__"];
 return (obj == null)?0:(uint)obj;
}

set
{
 
 if (this.IsUint(value.ToString()))
 {
  this.lb_PageCount.Text = value.ToString();
  ViewState["PageCount__"] = value;
 }
 else
  throw new System.Exception("页数范围不正确！");
}

}

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
  }
  
  /// <summary>
  ///  设计器支持所需的方法 - 不要使用代码编辑器
  ///  修改此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
this.btn_fistPage.Click += new System.EventHandler(this.btn_fistPage_Click);
this.btn_prePage.Click += new System.EventHandler(this.btn_prePage_Click);
this.btn_nextPage.Click += new System.EventHandler(this.btn_nextPage_Click);
this.btn_lastPage.Click += new System.EventHandler(this.btn_lastPage_Click);
this.btn_local.Click += new System.EventHandler(this.btn_local_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
  #endregion

private void EnableAllBtn()
  {
this.btn_fistPage.Enabled = true;
this.btn_lastPage.Enabled = true;
this.btn_prePage.Enabled  = true;
this.btn_nextPage.Enabled = true;

}

private void ChangeBtnStatus(char BtnIndex)
  {
switch(BtnIndex)
{
 case 'F':
  this.btn_fistPage.Enabled = false;
  this.btn_prePage.Enabled = false;
  break;
 case 'L':
  this.btn_nextPage.Enabled = false;
  this.btn_lastPage.Enabled = false;
  break;
 case 'P':
  this.btn_prePage.Enabled = false;
  break;
 case 'N':
  this.btn_nextPage.Enabled = false;
  break;
}
  }
  
  private void btn_lastPage_Click(object sender, System.EventArgs e)
  {
EnableAllBtn();

if( LocalBtnClick != null)
{
 LocalBtnClick(this.pageCount);
}

this.ChangeBtnStatus('L');
  }

private void btn_fistPage_Click(object sender, System.EventArgs e)
  {
EnableAllBtn();
if( LocalBtnClick != null)
{
 LocalBtnClick(1);
}

this.ChangeBtnStatus('F');
  }

private void btn_prePage_Click(object sender, System.EventArgs e)
  {
EnableAllBtn();

if (LocalBtnClick  == null) return;
if (this.pageIndex>1)
 this.pageIndex--;
else
{
 this.ChangeBtnStatus('P');
 this.ChangeBtnStatus('F');
}

this.LocalBtnClick(this.pageIndex);
  
  }

private void btn_nextPage_Click(object sender, System.EventArgs e)
  {
EnableAllBtn();
if (LocalBtnClick  == null) return;
if (this.pageIndex<this.pageCount)
 this.pageIndex++;
else
{
 this.ChangeBtnStatus('N');
 this.ChangeBtnStatus('L');

}

this.LocalBtnClick(this.pageIndex);
  }

private void btn_local_Click(object sender, System.EventArgs e)
  {
EnableAllBtn();
if (this.pageIndex <=1)
{
 this.tb_pageIndex.Text = "1";
 this.ChangeBtnStatus('F');
}
else
{
 if(this.pageIndex >= this.pageCount )
 {
  this.pageIndex = this.pageCount;
  this.ChangeBtnStatus('L');
 }
}

if( LocalBtnClick != null)
 LocalBtnClick(this.pageIndex);

  }
 }
}
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