写文件
//要先引用输入输出包
using System.IO;
//获取webservice所在的路径;
string path = Server.MapPath("WSLicence.asmx");
//截取文件夹路径
string folderPath = path.Substring(0, path.LastIndexOf('\\'));
string fileName = folderPath + "register.dat";
//如果文件夹不存在,创建文件
if (!File.Exists(fileName))
{
FileStream fs = new FileStream(folderPath + "register.dat", FileMode.CreateNew);
string content = serial + code + key;
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = System.Text.Encoding.UTF8.GetBytes(content);
byte[] crypoResult = md5.ComputeHash(result);
fs.Write(crypoResult, 0, crypoResult.Length);
//清空缓存
fs.Flush();
fs.Close();
}