C#根据URL生成签名

代码：

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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());             }             }     } }