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遍歷一個類/或類物件的屬性/值,很有用,看個例子

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication13
{
    class Program
    {
        static void Main(string[] args)
        {
            //新建一個物件
            Object o = new {name="zhifeiya",@class="myclass" };

            //如果有name這個屬性
            if(JudgeHasProperty("name",o))
            {
                //輸出name的值
                Console.WriteLine(GetPropertyValueByName("name",o).ToString());
            }

            //遍歷該ae物件的name/value (這是一個系統類,這裡拿來測試一下)
            ApplicationException ae = new ApplicationException();
            ForeachPropertyValues(ae);
            Console.Read();
        }



        /// <summary>
        /// 判斷 物件 中是否有該屬性(不區分大小寫)
        /// </summary>
        /// <param name="PropertyName">屬性名稱</param>
        /// <param name="o">目標物件</param>
        /// <returns></returns>
        public static bool JudgeHasProperty(string PropertyName,Object o)
        {
            if (o == null)
            {
                o = new { };
            }
            PropertyInfo[] p1 = o.GetType().GetProperties();
            bool b = false;
            foreach (PropertyInfo pi in p1)
            {
                if (pi.Name.ToLower() == PropertyName.ToLower())
               {
                   b = true;
               }
            }
            return b;
        }


        /// <summary>
        /// 獲取指定屬性的值(不區分大小寫)
        /// </summary>
        /// <param name="PropertyName">屬性名稱</param>
        /// <param name="o">目標物件</param>
        /// <returns></returns>
        public static Object GetPropertyValueByName(string PropertyName, Object o)
        {
            if (o == null)
            {
                o = new { };
            }
            //建立一個返回物件
            Object returnObject=new Object();
            PropertyInfo[] p1 = o.GetType().GetProperties();
            foreach (PropertyInfo pi in p1)
            {
                if (pi.Name.ToLower() == PropertyName.ToLower())
                {
                    returnObject = pi.GetValue(o);
                }
            }
            return returnObject;
        }



        /// <summary>
        /// 遍歷屬性的名稱/值(顯示形式:name=value)
        /// </summary>
        /// <param name="o"></param>
        public static void ForeachPropertyValues( Object o)
        {
            if (o == null)
            {
                o = new { };
            }
            PropertyInfo[] p1 = o.GetType().GetProperties();
            foreach (PropertyInfo pi in p1)
            {
                Console.WriteLine(pi.Name + ":" + pi.GetValue(o,null));
            }
        
        }

    }



}
 

執行結果:

場景案例:比如想對HtmlHelper寫一個擴充套件的生成Button標籤的方法:

        public static MvcHtmlString MyButton(this HtmlHelper h, Object HtmlAttribute)
        {
            if (HtmlAttribute == null)
            {
                HtmlAttribute = new { };
            }
            string str = "";
            PropertyInfo[] p1 = HtmlAttribute.GetType().GetProperties();
            foreach (PropertyInfo pi in p1)
            {

                str += "  " + pi.Name + "='" + pi.GetValue(HtmlAttribute, null).ToString() + "'   ";

            }

            return new MvcHtmlString( "<input type='button' " + str + " >");

        }
 

@Html.MyButton(new { id="but",name="butname",@class="myclass",value="submit"})

<input type='button'   id='but'     name='butname'     class='myclass'     value='submit'    >