C# Web开发 标准读写Cookies的方法 支持跨二级域和虚拟目录

加密Cookies和解密Cookies方法：

加密/解密方法 DESEncrypt
public class DESEncrypt
{
#region ========加密========

/// <summary>
/// 加密
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Encrypt(string Text)
{
return Encrypt(Text, "lixyvip");
}
/// <summary>
/// 加密数据
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Encrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray;
inputByteArray = Encoding.Default.GetBytes(Text);
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
return ret.ToString();
}

#endregion

#region ========解密========

/// <summary>
/// 解密
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Decrypt(string Text)
{
return Decrypt(Text, "lixyvip");
}
/// <summary>
/// 解密数据
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Decrypt(string Text, string sKey)
{
try
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
int len;
len = Text.Length / 2;
byte[] inputByteArray = new byte[len];
int x, i;
for (x = 0; x < len; x++)
{
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Encoding.Default.GetString(ms.ToArray());
}
catch
{
return Text;
}
}

#endregion
}

读取当前客户机器所有的Cookies代码：

string[] keyArr = HttpContext.Current.Request.Cookies.AllKeys;
for (int c = 0; c < keyArr.Length; c++)
{
Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Name);
Response.Write("<br />");
Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Expires.ToString());
Response.Write("<br />");
Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Value);
Response.Write("<br />");
Response.Write("<br />");
}

使用或自己写重载方法参考示例：Cookie有三个属性需要注意一下：
1. Domain 域
2. Path       路径
3. Expires 过期时间

跨域操作需要设置域属性:
Response.Cookies("MyCookie").Domain = "cnblogs.com"; (这里指的是泛域名)
这样在其它二级域名下就都可以访问到了， ASP 和 ASP.NET 测试通过

虚拟目录下访问：
我在ASP端做了下测试，.NET的没试, 如果不指定Path属性， 不同虚拟目录下Cookie无法共享
将Response.Cookies("MyCookie").Path = "/" 就可以了

总的写法:
Response.Cookies("MyCookie").Domain = "cnblogs.com";
Response.Cookies("MyCookie").Path = "/"
Response.Cookies("MyCookie").Expires = Now + 365;
Response.Cookies("MyCookie")("Test") = "test";

SetUserCookies(SiteInfo.DomainName, "/", "hnce", name, str, DateTime.Now.AddMinutes(miniute));

return GetUserCookies("hnce", name);

ClearUserCookies(SiteInfo.DomainName, "/", "hnce");

另外提醒一下，cookie.Values.Add(_cookiename, _value); 跟 cookie.Values[_cookiename] = _value; 这两种方式都可以设置Cookies的值，但是Add和Set方法后，读取要使用Get方法，而Values[]赋值方式，读取要使用HttpContext.Current.Request.Cookies[_key][_cookiename].ToString()

否则有Cookies读取不了的情况。

//下面附参考文章的部分内容说明

//------------------------------------------------------------------------

在博客园看到另外一个朋友的可跨二级域操作Cookies方法，在它基础上完善了一下，现发出来

我参考的哪位朋友的文章地址是：http://www.cnblogs.com/voswin/articles/1281520.html

如果无法使用：

请导入命名空间

using System.Security.Cryptography;
using System.Text