獲取URL參數值（JS和C#版本）

JS版本

function getQueryString(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
    var r = window.location.search.substr(1).match(reg);
    if (r != null)
        return unescape(r[2]);
    return null;
};

C#版本

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Collections.Specialized;

namespace MINTH.Framework.Core
{
    public  class UrlQueryHelper
    {
        public string getQueryValue(string Key, string Url)
        {
            NameValueCollection col = GetQueryString(Url);

            return col[Key];
        }
        /// <summary>
        /// 將查詢字符串解析轉換爲名值集合.
        /// </summary>
        /// <param name="queryString"></param>
        /// <returns></returns>
        public NameValueCollection GetQueryString(string Url)
        {
            Uri uri = new Uri(Url);

            return GetQueryString(uri.Query, null, true);
        }

        /// <summary>
        /// 將查詢字符串解析轉換爲名值集合.
        /// </summary>
        /// <param name="queryString"></param>
        /// <param name="encoding"></param>
        /// <param name="isEncoded"></param>
        /// <returns></returns>
        public NameValueCollection GetQueryString(string queryString, Encoding encoding, bool isEncoded)
        {
            queryString = queryString.Replace("?", "");
            NameValueCollection result = new NameValueCollection(StringComparer.OrdinalIgnoreCase);
            if (!string.IsNullOrEmpty(queryString))
            {
                int count = queryString.Length;
                for (int i = 0; i < count; i++)
                {
                    int startIndex = i;
                    int index = -1;
                    while (i < count)
                    {
                        char item = queryString[i];
                        if (item == '=')
                        {
                            if (index < 0)
                            {
                                index = i;
                            }
                        }
                        else if (item == '&')
                        {
                            break;
                        }
                        i++;
                    }
                    string key = null;
                    string value = null;
                    if (index >= 0)
                    {
                        key = queryString.Substring(startIndex, index - startIndex);
                        value = queryString.Substring(index + 1, (i - index) - 1);
                    }
                    else
                    {
                        key = queryString.Substring(startIndex, i - startIndex);
                    }
                    if (isEncoded)
                    {
                        result[MyUrlDeCode(key, encoding)] = MyUrlDeCode(value, encoding);
                    }
                    else
                    {
                        result[key] = value;
                    }
                    if ((i == (count - 1)) && (queryString[i] == '&'))
                    {
                        result[key] = string.Empty;
                    }
                }
            }
            return result;
        }

        /// <summary>
        /// 解碼URL.
        /// </summary>
        /// <param name="encoding">null爲自動選擇編碼</param>
        /// <param name="str"></param>
        /// <returns></returns>
        public string MyUrlDeCode(string str, Encoding encoding)
        {
            if (encoding == null)
            {
                Encoding utf8 = Encoding.UTF8;
                //首先用utf-8進行解碼                     
                string code = HttpUtility.UrlDecode(str.ToUpper(), utf8);
                //將已經解碼的字符再次進行編碼.
                string encode = HttpUtility.UrlEncode(code, utf8).ToUpper();
                if (str == encode)
                    encoding = Encoding.UTF8;
                else
                    encoding = Encoding.GetEncoding("gb2312");
            }
            return HttpUtility.UrlDecode(str, encoding);
        }
    }
}