C# 常见Url操作实例（二）

一、Base64转码url，判断url是否是base64格式，url字符串中参数解析

/// <summary>
/// URL的操作类
/// </summary>
public class UrlOper
{
static System.Text.Encoding encoding = System.Text.Encoding.UTF8;

#region URL的64位编码
public static string Base64Encrypt(string sourthUrl)
{
string eurl = HttpUtility.UrlEncode(sourthUrl);
eurl = Convert.ToBase64String(encoding.GetBytes(eurl));
return eurl;
}
#endregion

#region URL的64位解码
public static string Base64Decrypt(string eStr)
{
if (!IsBase64(eStr))
{
return eStr;
}
byte[] buffer = Convert.FromBase64String(eStr);
string sourthUrl = encoding.GetString(buffer);
sourthUrl = HttpUtility.UrlDecode(sourthUrl);
return sourthUrl;
}
/// <summary>
/// 是否是Base64字符串
/// </summary>
/// <param name="eStr"></param>
/// <returns></returns>
public static bool IsBase64(string eStr)
{
if ((eStr.Length % 4) != 0)
{
return false;
}
if (!Regex.IsMatch(eStr, "^[A-Z0-9/+=]*$", RegexOptions.IgnoreCase))
{
return false;
}
return true;
}
#endregion
/// <summary>
/// 分析 url 字符串中的参数信息。sharejs.com
/// </summary>
/// <param name="url">输入的 URL</param>
/// <param name="baseUrl">输出 URL 的基础部分</param>
/// <param name="nvc">输出分析后得到的 (参数名,参数值) 的集合</param>
public static void ParseUrl(string url, out string baseUrl, out NameValueCollection nvc)
{
if (url == null)
throw new ArgumentNullException("url");

nvc = new NameValueCollection();
baseUrl = "";

if (url == "")
return;

int questionMarkIndex = url.IndexOf('?');

if (questionMarkIndex == -1)
{
baseUrl = url;
return;
}
baseUrl = url.Substring(0, questionMarkIndex);
if (questionMarkIndex == url.Length - 1)
return;
string ps = url.Substring(questionMarkIndex + 1);

// 开始分析参数对
Regex re = new Regex(@"(^|&)?(\w+)=([^&]+)(&|$)?", RegexOptions.Compiled);
MatchCollection mc = re.Matches(ps);
foreach (Match m in mc)
{
nvc.Add(m.Result("$2").ToLower(), m.Result("$3"));
}
}
}
Url操作实例一