利用wininet.dll 组件读取cookie ：

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);
private static string GetCookies(string url)
{
uint datasize = 1024;
StringBuilder cookieData = new StringBuilder((int)datasize);
if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x2000, IntPtr.Zero))
{
if (datasize < 0)
return null;

cookieData = new StringBuilder((int)datasize);
if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, IntPtr.Zero))
return null;
}
return cookieData.ToString();
}

备注：在cookie解析的过程中：

cookie的value中如果包含有，（逗号）的情况下，可用 %2C 替换掉

举例：

CookieContainer cookieContainer = new CookieContainer();
string cookieStr = GetCookies("http://abc.com/");

string[] cookstr = cookieStr.Split(';');
foreach (string str in cookstr)
{
string[] data= str.Split('=');
if (data[1].Trim().ToString().IndexOf(',') != -1)
{
data[1] = data[1].Trim().ToString().Replace(",", "%2C");
}
Cookie ck = new Cookie(data[0].Trim().ToString(), data[1].Trim().ToString());
cookieContainer .Add(new Uri("http://abc.com/"), ck);
}

========cookie的设置：===============================

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);

public void WebBrowserControl(string url,string cookie)
{

foreach (string cookieItem in cookie.Split(';'))
{

string[] item = cookieItem .Split('=');
//set  cookie
InternetSetCookie(url, item[0], item[1]);

}

this.webBrowser1.Url = new Uri(url);

}

end。