How to Use JS Calling A WebService By Post Both SOAP And JSON

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

using System.Runtime.Serialization;
using System.IO;
using System.Web;

namespace kuuy.Components.Services
{
    //WebService扩展
    public class EnhancedWebService : System.Web.Services.WebService
    {
        public EnhancedWebService()
            : base()//调用基类构造
        {
            string ServiceMethodName = GetMethodName();
            bool IsJSON = Context.Request.QueryString["out"] == "json";
            if (IsJSON) InterceptJSONMethodRequest(ServiceMethodName);
        }
        private string GetMethodName()//获得方法名
        {
            return Context.Request.Url.Segments[Context.Request.Url.Segments.Length - 1];//URL段数（/）
        } 
        private void InterceptJSONMethodRequest(string ServiceMethodName)
        {
            JSONMethodAttribute JMA = GetMethodJSONMethodAttribute(ServiceMethodName);//描述
            if (JMA == null)
            {
                Context.Response.Write("throw new Exception('The Web Service method " +
                                       ServiceMethodName + " is not available " +
                                       "as a JSON function. For more " +
                                       "information contact " +
                                       "the Web Service Administrators.');");
            }
            else
            {
                //ToDo: deserialize parameters, call target method, 
                //      deserialize and write return value
                Type Service = this.GetType();
                MethodInfo JSONMethod = Service.GetMethod(ServiceMethodName);//获取构造函数的参数
                if (JSONMethod == null) return;
                //参数集
                ParameterInfo[] JSONMethodParameters = JSONMethod.GetParameters();
                object[] CallParameters = new object[JSONMethodParameters.Length];
                //遍历
                for (int i = 0; i < JSONMethodParameters.Length; i++)
                {
                    //参数
                    ParameterInfo TargetParameter = JSONMethodParameters[i];
                    string RawParameter = HttpUtility.UrlDecode(Context.Request.Form[TargetParameter.Name]);//获取值
                    if (RawParameter == null || RawParameter == "")
                        throw new Exception("Missing parameter " + TargetParameter.Name + ".");
                    CallParameters[i] = JSONHelper.Deserialize<object>(RawParameter, TargetParameter.ParameterType);
                }
                object JSONMethodReturnValue = JSONMethod.Invoke(this, CallParameters);
                string SerializedReturnValue = JSONHelper.Serialize<object>(JSONMethodReturnValue);//返回JSON串
                Context.Response.Write(SerializedReturnValue);
            }
            Context.Response.Flush();
            Context.Response.End();
        }
        private JSONMethodAttribute GetMethodJSONMethodAttribute(string WebServiceMethodName)
        {
            MethodInfo ActiveMethod = this.GetType().GetMethod(WebServiceMethodName);
            JSONMethodAttribute JMA = null;
            if (ActiveMethod != null)
            {
                object[] Attributes = ActiveMethod.GetCustomAttributes(true);
                foreach (object Attribute in Attributes)
                {
                    if (Attribute.GetType() == typeof(JSONMethodAttribute))
                    {
                        JMA = (JSONMethodAttribute)Attribute;
                    }
                }
            }
            return JMA;
        }
    }
    //JSON描述类
    public class JSONMethodAttribute : System.Attribute
    {
        public JSONMethodAttribute()
        {
        }
    }
}