C#反射——模仿ParameterInterceptor(ashx处理程序)

反射工具类请参见：https://www.cnblogs.com/threadj/p/10535796.html

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Collections;
using System.Collections.Specialized;
using System.Reflection;

namespace ReligionServer.util
{
    public class ParametersUtil
    {

        private static NameValueCollection collection = null;

        //从Request.Param中获取指定的类型字段的值, 并用这些值结合字段初始化一个Hashtable  --> hashTable(String fieldName, String fieldName)fieldName来源于Request.Param中
        public static Hashtable GetHashtableFormRequest(HttpContext context, Type type)
        {

            collection = context.Request.Params;

            Hashtable map = new Hashtable();
            //FieldInfo[] fields = ReflectionUtil.GetFileldS(type); //在后来的修改之后, 返回List, 且包含当前类和除开Object的所有父类的属性
            String value = "";
            foreach (FieldInfo item in ReflectionUtil.GetFileldS(type))
            {
                value = item.Name.Substring(item.Name.IndexOf("<") + , item.Name.IndexOf(">") - );
                map.Add(value, collection.Get(value));
            }
            //System.Diagnostics.Debug.WriteLine(context.Request.Params.Count);
            //ClearForOnlyValueMap(map);//是否有必要
            return map;
        }

        /// <summary>
        /// 从HttpContext中初始化实体
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="context"></param>
        /// <param name="t"></param>
        /// <returns></returns>
        public static T GetInstanceFormRequest<T>(HttpContext context, T t)
        {
            String foreignKey = context.Request["ForeignKey"];
            collection = context.Request.Params;
            String value = "";
            foreach (FieldInfo item in ReflectionUtil.GetFileldS(t.GetType()))
            {
                if (item.Name.IndexOf("<") != -)
                {
                    value = item.Name.Substring(item.Name.IndexOf("<") + , item.Name.IndexOf(">") - );
                }
                else
                {
                    value = item.Name;
                }
                item.SetValue(t, GetValueByType(item.FieldType, collection.Get(value)));
            }
            return t;
        }

        public static Object GetValueByType(Type type, String value)
        {
            if (type.Equals(typeof(DateTime)))
            {
                return DateUtil.ToDateTimeWithFormatf(value);
            }
            else if (type.Equals(typeof(MongoDB.Bson.BsonValue)))
            {
                return MongoDB.Bson.BsonValue.Create(value);
            }
            else if (type.Equals(typeof(Boolean)))
            {
                value = util.CommonUtil.IsEmpty(value) == true ? "false" : value;//如果上传参数为空, 那么默认初始化为false
                return Boolean.Parse(value);
            } else if (type.Equals(typeof(int))) {
                return Convert.ToInt32(value);
            }
            return value;
        }

        //将Hashtable中的空值去掉
        private static void ClearForOnlyValueMap(Hashtable map)
        {
            foreach (String key in map)
            {
                if (null == map[key])
                {
                    map.Remove(key);
                }
            }
        }

    }
}