動態(tài)加載用戶控件的組件！(一)

素行 2007-03-17

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我們寫用戶控件的目的就是放到頁面中去。根據不同的條件，我們可以改變加載的用戶控件！

其實原理就是MasterPage的原理。這個MasterPage會在vs2005中提供，但是現在也可以實現。

在我的項目中就用到：

MasterPage就四個類，其中容器就動態(tài)加載用戶控件。這種功能在vs2005中將無處不在。

下面簡單介紹一下動態(tài)加載葉面組件：

我們只需要改變用戶組件的地址就可以動態(tài)改變加載的用戶組件了。

在程序中動態(tài)改變SkinPath就可以了。

組件源碼如下：

using System;
//using System.Drawing;
using System.Collections;
using System.Collections.Specialized;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.IO;
using System.Web.Security;
using Region.Components;

namespace Region.Controls {

    [ParseChildren(true)]
    /// <summary>
    /// 頁面組件，從用戶組件獲取
    /// </summary>
    public abstract class SkinnedControl : WebControl, INamingContainer {

        string skinFilename = null;
        string skinName = null;
  string skinPath;

       // string returnURL = null;

        /// <summary>
        /// 添加子組件
        /// </summary>
        protected override void CreateChildControls() {
   if(SkinPath == null || SkinPath == "" || SkinPath.Trim() == "")
    return ;
            Control skin;
            skin = LoadSkin();
            InitializeSkin(skin);
            Controls.Add(skin);
        }

        /// <summary>
        /// 獲取摸板組件
        /// </summary>
        /// <returns>組件</returns>
  protected Control LoadSkin()
  {
   Control skin;
   try
   {
    skin = Page.LoadControl(SkinPath);
   }
   catch (FileNotFoundException)
   {
    throw new Exception("找不到文件：[ " + SkinPath + " ] .");
   }
   return skin;
  }

        /// <summary>
        /// 初始化組建摸板
        /// </summary>
        /// <param name="skin">組件</param>
        protected abstract void InitializeSkin(Control skin);

        /// <summary>
        /// 用戶組件名稱
        /// </summary>
  public string SkinFilename
  {
   get
   {
    return skinFilename;
   }
   set
   {
    skinFilename = value;
   }
  }

        /// <summary>
        /// 組件名稱
        /// </summary>
  protected string SkinName
  {
   get
   {
    return skinName;
   }
   set
   {
    skinName = value;
   }
  }

  /// <summary>
  /// 用戶組件相對路徑及組件名稱
  /// </summary>
  public string SkinPath
  {
   get
   {
    return skinPath;
   }
   set
   {
    skinPath = value;
    SkinFilename = value.TrimStart(‘/‘);

   }
  }

}
}

比如我的一個應用：

switch (context.PageId)
   {
    case "1_1" :
     base.SkinPath = "~/Themes/SignManager/TermList.ascx";
     break ;
    case "1_1_1" :
     base.SkinPath = "~/Themes/SignManager/TermEdit.ascx";
     break ;
    case "1_2" :
     base.SkinPath = "~/Themes/SignManager/MemberList.ascx";
     break ;

    case "1_2_1" :
     base.SkinPath = "~/Themes/SignManager/MemberEdit.ascx";
     break ;
    case "2_1" :
     base.SkinPath = "~/Themes/SignManager/CardSend.ascx";
     break ;
    case "3_1" :
     base.SkinPath = "~/Themes/SignManager/MemberNoEdit.ascx";
     break ;
    case "4_1" :
     base.SkinPath = "~/Themes/AcountEdit.ascx";
     break ;
    default :
     base.SkinPath = "";
     break;
   }