HttpContext的dynamic包装器DynamicHttpContext （附原代码）

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