项目背景：在.net framework下使用asp.net webform，特别是aspx+ajax+ashx中，ashx后台代码获取传入参数的时候，需要很多[“…”]，我用dynamic对他进行包装。

废话不多说，上代码（文章最下面有上传打包代码）：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace MyWebDemo{    public partial class UserList : System.Web.UI.Page    {        /// <summary>        /// StevemChennet@live.com qq:38798579        /// http://www.cnblogs.com/stevenchennet        /// </summary>        protected void Page_Load(object sender, EventArgs e)        {            //             // 这是以前的做法，这些["parameter"]很费劲            //            //HttpContext context = HttpContext.Current;            //if (!this.IsPostBack)            //{            //    // http://localhost:20000/UserList.aspx?id=1&name=StevenChennet            //    int id = int.Parse(context.Request.Params["id"]);            //    
            //    string name = context.Request.Params["nAMe"];            //    this.lbl.InnerText = string.Format("Get提交 id:{0} name:{1}", id, name);            //}            //else            //{            //    // form post             //    int age = int.Parse(context.Request.Form["age"]);            //    string address = context.Request.Form["AddRESS"];            //    this.lbl.InnerText = string.Format("Post提交 age:{0} address:{1}", age, address);            //}            dynamic dContext = new DynamicHttpContext(HttpContext.Current);            if (!this.IsPostBack)            {                // http://localhost:20000/UserList.aspx?id=1&name=StevenChennet                int id = dContext.id;                // nAMe也可以用Name,忽略大小写的,这里故意写成nAMe意思是忽略大小写。
                string name = dContext.nAMe;                this.lbl.InnerText = string.Format("Get提交 id:{0} name:{1}", id, name);            }            else            {                // form post                 int age = dContext.Age;                string address = dContext.AddRESS;                this.lbl.InnerText = string.Format("Post提交 age:{0} address:{1}", age, address);            }        }    }}

下面是实现的代码

using System;using System.Collections.Generic;using System.Dynamic;using System.Linq;using System.Web;namespace System.Web{    /// <summary>    /// StevemChennet@live.com qq:38798579    /// http://www.cnblogs.com/stevenchennet    /// </summary>    public class DynamicHttpContext : DynamicObject    {        private string keyContent;        private HttpContext httpContext;        public DynamicHttpContext(HttpContext context)        {            this.httpContext = context;        }        public override bool TryGetMember(GetMemberBinder binder, out object result)        {            string key = binder.Name;            if (httpContext.Request.HttpMethod == "GET")            {                this.keyContent = this.httpContext.Request.QueryString.Get(key);            }            else            {                this.keyContent = this.httpContext.Request.Form.Get(key);            }            result = this;            return true;        }        public override bool TryConvert(ConvertBinder binder, out object result)        {            result = null;            Type binderType = binder.Type;            //int            if (binderType == typeof(int))            {                result = int.Parse(this.keyContent);            }            else if (binderType == typeof(int?))            {                if (string.IsNullOrWhiteSpace(this.keyContent))                {                    result = int.Parse(this.keyContent);                }                else                {                    result = default(int?);                }            }            // bool            else if (binderType == typeof(bool))            {                result = bool.Parse(this.keyContent);            }            else if (binderType == typeof(bool?))            {                if (string.IsNullOrWhiteSpace(this.keyContent))                {                    result = bool.Parse(this.keyContent);                }                else                {                    result = default(bool?);                }            }            // datetime            else if (binderType == typeof(DateTime))            {                result = DateTime.Parse(this.keyContent);            }            else if (binderType == typeof(DateTime?))            {                if (string.IsNullOrWhiteSpace(this.keyContent))                {                    result = DateTime.Parse(this.keyContent);                }                else                {                    result = default(DateTime?);                }            }            // string            else if (binderType == typeof(string))            {                result = this.keyContent;            }            else            {                throw new NotSupportedException(string.Format("类型 {0} 还未实现，请添加转换代码", binderType.ToString()));            }            return true;        }    }}

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代码打包下载（VS2013）

http://files.cnblogs.com/StevenChennet/AppDomainPerformanceDemo.zip

HttpContext的dynamic包装器DynamicHttpContext （附原代码）