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反射学习笔记之遍历System.Drawing.Color结构(转载)

2010-02-24 22:08  爱研究源码的javaer  阅读(353)  评论(0)  编辑  收藏  举报

前台:

 

代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Reflection_Color.aspx.cs" Inherits="Reflection_Color" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
    #pnColors div
    {
        float:left;
         width:140px;
         text-align:center;
         margin:3px;
         border:1px solid #aaa;
         font-size:11px;
         font-family: Verdana,Arial
        
        }
    </style>
    
</head>
<body>
    <h1>Coding4Fun 使用反射遍历System.Drawing.Color结构</h1>
    <form id="form1" runat="server">
    <asp:RadioButtonList ID="rblSort"  runat="server" AutoPostBack="true"  RepeatDirection="Horizontal" RepeatLayout="Flow">
    <asp:ListItem Selected="True">Name</asp:ListItem>
    <asp:ListItem>Color</asp:ListItem>
    </asp:RadioButtonList>
    <asp:Panel ID="pnColors" runat="server"></asp:Panel>
    </form>
</body>
</html>

 

后台:

 

代码
public partial class Reflection_Color : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SortBy sort;

        if (!IsPostBack)
        {
            sort = SortBy.Name;
        }
        else
        {
            sort = (SortBy)Enum.Parse(typeof(SortBy), rblSort.SelectedValue);
        }

        List<Div> list = new List<Div>();

        Type t = typeof(System.Drawing.Color);

        System.Reflection.PropertyInfo[] properties = t.GetProperties( System.Reflection.BindingFlags.Static| System.Reflection.BindingFlags.Public);

        Div div;

        foreach (System.Reflection.PropertyInfo p in properties)
        {
            System.Drawing.Color c;

            c = (System.Drawing.Color)t.InvokeMember(p.Name, System.Reflection.BindingFlags.GetProperty, null, typeof(System.Drawing.Color), null);

            div = new Div(c);

            list.Add(div);
        
        }

        list.Sort(Div.GetComparer(sort));//排序

        foreach (Div item in list)
        {
            pnColors.Controls.Add(item);
        }
    }
}

public class Div : System.Web.UI.HtmlControls.HtmlGenericControl
{
    private int colorValue;

    private string name;

    public Div(System.Drawing.Color color)
        : base("div") //调用基类构造函数，创建一个Div
    {
        this.name = color.Name;

        this.colorValue = color.R * 256 + color.G * 256 + color.B * 256;

        this.InnerHtml =  String.Format("{0}<br/>RGB({1},{2},{3})",name,color.R,color.G,color.B);

        int total = color.R + color.G + color.B;

        if(total <= 255)
        {
            this.Style.Add("color", "#eee");
        }

        this.Style.Add("background", String.Format("rgb({0},{1},{2})", color.R, color.G, color.B));
    

    }

    public static ColorComparer GetComparer(SortBy sort)
    {
        return new ColorComparer(sort);
    }

    public static ColorComparer GetComparer()
    {
        return GetComparer(SortBy.Name);
    }


    public class ColorComparer:IComparer<Div>
    {
        private SortBy sort;

        public ColorComparer(SortBy sort)
        {
            this.sort = sort;
        }

        //实现IComparer<T>接口，根据Sort判断以何为依据进行排序
        public int Compare(Div x, Div y)
        {
            if (sort == SortBy.Name)
            {
                return String.Compare(x.name, y.name);
            }
            else
            {
                return x.colorValue.CompareTo(y.colorValue);
            }
        }
    
    }
}

public enum SortBy
{ 
   Name,Color
}