C#根据URL生成签名

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ADT.TuDou.FineManage
{
    public partial class Atest : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string url = Request.Url.ToString();
            string query = Request.Url.Query;
            if (!string.IsNullOrEmpty(query))
            {
                Dictionary<string, string> dic = new Dictionary<string, string>();

                query = query.Substring(1, query.Length - 1);
                string[] kv = query.Split(new char[] { '&' }, StringSplitOptions.RemoveEmptyEntries);
                foreach (string item in kv)
                {
                    string[] kv2 = item.Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
                    dic.Add(kv2[0], kv2[1]);
                }

                IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(dic); //dic.OrderBy(c => c.Key).ToDictionary(k => k.Key, v => v.Value);

                IEnumerator<KeyValuePair<string, string>> iterator = sortedParams.GetEnumerator();

                // 遍历排序后的字典，将所有参数按"key=value"格式拼接在一起
                StringBuilder basestring = new StringBuilder();
                while (iterator.MoveNext())
                {
                    string key = iterator.Current.Key;
                    string value = iterator.Current.Value;
                    if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(value))
                    {
                        basestring.Append(key).Append("=").Append(value);
                    }
                }

                // 使用MD5对待签名串求签
                MD5 md5 = MD5.Create();
                byte[] bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(basestring.ToString()));

                // 将MD5输出的二进制结果转换为小写的十六进制
                StringBuilder result = new StringBuilder();
                for (int i = 0; i < bytes.Length; i++)
                {
                    string hex = bytes[i].ToString("x");
                    if (hex.Length == 1)
                    {
                        result.Append("0");
                    }
                    result.Append(hex);
                }
                Response.Write(result.ToString());
            }

        }
    }
}