给通用控件赋值

有看到一网友在论坛上问问题，Insus.NET尝试了一下，下面提供Insus.NET所理解的基础之上的解决方案，仅供参考，原问题如下：



在解决之前，先准备一些数据吧。端午节快到了，公司分福利，希望你们公司也有。数据集是一个Hashtable:

private Hashtable GetData()
    {
        Hashtable ht = new Hashtable();
        ht.Add(1, "粽子");
        ht.Add(2, "苹果");
        ht.Add(3, "雪梨");
        ht.Add(4, "荔技");
        ht.Add(5, "现金");
        return ht;
    }

在站点上创建一个网页，在.aspx页面上，写上下面代码：



到Insus.NET的博客上，下载两个给件，是专为ListControl绑定的，已经重构过了的：
http://www.cnblogs.com/insus/archive/2013/01/28/2880618.html

http://www.cnblogs.com/insus/archive/2009/12/13/1622884.html

解压之后，把DLL拉入BIN目录中。如：



然后，我们去.aspx.cs为页面的CheckBoxList，DropDownList，RadioButtonList控件绑定数据源。



接下来，我们想在文本框填入一些值，这个值能够指向那些控件中选项的值，如果没有对应的值，控件将是回归至默认(缺省值)的状态。由于每个控件是不同的对象，为了能让它们能够互动，有一致的动作，Insus.NET写一个接口：



下面，要看你需要什么控件来互动了，也就是什么控件来接收文本框的值了。需要的控件，均接中写一个适配器(Adapter)，由于Insus.NET仅列举了三个，因此分别写三个适配器。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusCheckBoxList
/// </summary>
namespace Insus.NET
{
    public class InsusCheckBoxList: InsusAdapter
    {
        CheckBoxList _CheckBoxList;
        
        public InsusCheckBoxList()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public void SetValue(WebControl wc, object value)
        {
            if (wc is CheckBoxList)
            {
                _CheckBoxList = (CheckBoxList)wc;

                foreach (ListItem li in this._CheckBoxList.Items)
                {
                    li.Selected = li.Text == value.ToString() ? true : false;                    
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusDropDownList
/// </summary>
namespace Insus.NET
{
   
    
    public class InsusDropDownList: InsusAdapter 
    {
       DropDownList _DropDownList;
        
        public InsusDropDownList()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public void SetValue(WebControl wc, object value)
        {
            if (wc is DropDownList)
            {
                _DropDownList = (DropDownList)wc;

                this._DropDownList.ClearSelection();
                foreach (ListItem li in this._DropDownList.Items)
                {
                    if (li.Text == value.ToString ())
                        this._DropDownList.Items.FindByText(value.ToString()).Selected = true;                   
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusRadioButtonList
/// </summary>
namespace Insus.NET
{
    public class InsusRadioButtonList: InsusAdapter

    {
        RadioButtonList _RadioButtonList;
        
        public InsusRadioButtonList()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public void SetValue(WebControl wc, object value)
        {
            if (wc is RadioButtonList)
            {
                _RadioButtonList = (RadioButtonList)wc;
                               
                foreach (ListItem li in this._RadioButtonList.Items)
                {
                    li.Selected = li.Text == value.ToString() ? true : false; 
                }
            }
        }
    }
}

 如果还有基它，继续写出来......
下面就是Button按钮的Click事件：



好了，还是看看最终的效果吧：

 

以下内容，于2013-06-11 09:00添加：

早上来看到第一次所想的，有些地方，觉得设计不好。按照面向对象的设计理念来说，接口设计的藕合性过高，接口内方法SetValue需要带两个参数。理想的带一个参数为好。
因此，Insus.NET把接口改为：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusAdapter
/// </summary>
namespace Insus.NET
{
    public interface InsusAdapter
    {
        void SetValue(object value);
    }
}

这样一改的话，那怎样知道是给那个一个控制赋值？ 解决这个问题，我们可以使用构造函数来处理。回到上面的那三个适配器InsusCheckBoxList，InsusDropDownList，InsusRadioButtonList，下面是重构好之后的适配器：

using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusCheckBoxList
/// </summary>
namespace Insus.NET
{
    public class InsusCheckBoxList : InsusAdapter
    {
        CheckBoxList _CheckBoxList;

        public InsusCheckBoxList(CheckBoxList checkBoxList)
        {
            this._CheckBoxList = checkBoxList;
        }

        public void SetValue(object value)
        {
            foreach (ListItem li in this._CheckBoxList.Items)
            {
                li.Selected = li.Text == value.ToString() ? true : false;
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusDropDownList
/// </summary>
namespace Insus.NET
{
    public class InsusDropDownList : InsusAdapter
    {
        DropDownList _DropDownList;

        public InsusDropDownList(DropDownList dropDownList)
        {
            this._DropDownList = dropDownList;
        }
       
        public void SetValue(object value)
        {
            this._DropDownList.ClearSelection();
            foreach (ListItem li in this._DropDownList.Items)
            {
                if (li.Text == value.ToString())
                    this._DropDownList.Items.FindByText(value.ToString()).Selected = true;
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusRadioButtonList
/// </summary>
namespace Insus.NET
{
    public class InsusRadioButtonList : InsusAdapter
    {
        RadioButtonList _RadioButtonList;

        public InsusRadioButtonList(RadioButtonList radioButtonList)
        {
            this._RadioButtonList = radioButtonList;
        }

        public void SetValue(object value)
        {
            foreach (ListItem li in this._RadioButtonList.Items)
            {
                li.Selected = li.Text == value.ToString() ? true : false;
            }
        }
    }
}

重构之后，控件就可以在适配器new实例化时，就传入去了。



可以参考下面重构全过程：



以下内容，于2013-06-11 10:20添加：

此部分内容，只是重构一下comments的语句，因为每个控件的适配器有实作接口，所以使用多态来重构它们。