C#反射遍历/查询类中的属性以及值

遍历一个类/或类对象的属性/值,很有用,看个例子

    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)
            {
                //新建一个对象
                Object o = new {name="zhifeiya",@class="myclass" };  

                //如果有name这个属性
                if(JudgeHasProperty("name",o))
                {
                    //输出name的值
                    Console.WriteLine(GetPropertyValueByName("name",o).ToString());
                }  

                //遍历该ae对象的name/value (这是一个系统类,这里拿来测试一下)
                ApplicationException ae = new ApplicationException();
                ForeachPropertyValues(ae);
                Console.Read();
            }  

            /// <summary>
            /// 判断 对象 中是否有该属性(不区分大小写)
            /// </summary>
            /// <param name="PropertyName">属性名称</param>
            /// <param name="o">目标对象</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>
            /// 获取指定属性的值(不区分大小写)
            /// </summary>
            /// <param name="PropertyName">属性名称</param>
            /// <param name="o">目标对象</param>
            /// <returns></returns>
            public static Object GetPropertyValueByName(string PropertyName, Object o)
            {
                if (o == null)
                {
                    o = new { };
                }
                //创建一个返回对象
                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>
            /// 遍历属性的名称/值(显示形式: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));
                }  

            }  

        }  

    }  

运行结果:

场景案例:比如想对HtmlHelper写一个扩展的生成Button标签的方法:

    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 + " >");  

    }  

使用的时候,在视图中,我们就可以这样直接调用了:

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

生成的html代码:

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