字符的类型转换

  public class GF_Convert
    {
        /// <summary>
        /// 字符串 转换 char数组
        /// </summary>
        /// <param name="in_str"></param>
        /// <param name="in_len"></param>
        /// <returns></returns>
        public static char[] string2chararray(string in_str, int in_len)
        {
            char[] ch = new char[in_len];
            in_str.ToCharArray().CopyTo(ch, 0);
            return ch;
        }
 
        /// <summary>
        /// char数组 转换 字符串
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>       
        public static string chararray2string(char[] in_str)
        {
            string out_str;
            out_str = new string(in_str);
            int i = out_str.IndexOf('\0', 0);
            if (i == -1)
                i = 16;
            return out_str.Substring(0, i);
        }
 
        /// <summary>
        /// byte数组 转换 字符串
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static string bytearray2string(byte[] in_str)
        {
            string out_str;
            out_str = System.Text.Encoding.Default.GetString(in_str);
            return out_str.Substring(0, out_str.IndexOf('\0', 0));
 
        }
 
        /// <summary>
        /// 字符串 转换 byte数组  注意转换出来会使原来的bytearray长度变短
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static byte[] string2bytearray(string in_str)
        {
            return System.Text.Encoding.Default.GetBytes(in_str);
        }
 
        /// <summary>
        /// 字符串 转换 byte数组  长度为传如的长度
        /// </summary>
        /// <param name="in_str">传入字符串</param>
        /// <param name="iLen">目标字节数组长度</param>
        /// <returns></returns>
        public static byte[] string2bytearray(string in_str, int iLen)
        {
            byte[] bytes = new byte[iLen];
            byte[] bsources=System.Text.Encoding.Default.GetBytes(in_str);
            Array.Copy(bsources, bytes, bsources.Length);
            
            
            return bytes;
        }
        
        /// <summary>
        /// 将字符串编码为Base64字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Base64Encode(string str)
        {
            byte[] barray;
            barray = Encoding.Default.GetBytes(str);
            return Convert.ToBase64String(barray);
        }
 
        /// <summary>
        /// 将Base64字符串解码为普通字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Base64Decode(string str)
        {
            byte[] barray;
            try
            {
                barray = Convert.FromBase64String(str);
                return Encoding.Default.GetString(barray);
            }
            catch
            {
                return str;
            }
        }
 
        /// <summary>
        /// 图片 转换 byte数组
        /// </summary>
        /// <param name="pic"></param>
        /// <param name="fmt"></param>
        /// <returns></returns>
        public static byte[] image_Image2Byte(Image pic, System.Drawing.Imaging.ImageFormat fmt)
        {
            MemoryStream mem = new MemoryStream();
            pic.Save(mem, fmt);
            mem.Flush();
            return mem.ToArray();
        }
        /// <summary>
        /// byte数组 转换 图片
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static Image image_Byte2Image(byte[] bytes)
        {
            MemoryStream mem = new MemoryStream(bytes, true);
            mem.Read(bytes, 0, bytes.Length);
            mem.Flush();
            Image aa = Image.FromStream(mem);
            return aa;
        }
                
        /// <summary>
        /// ip 转换 长整形
        /// </summary>
        /// <param name="strIP"></param>
        /// <returns></returns>
        public static long IP2Long(string strIP)
        {
 
            long[] ip = new long[4];
 
            string[] s = strIP.Split('.');
            ip[0] = long.Parse(s[0]);
            ip[1] = long.Parse(s[1]);
            ip[2] = long.Parse(s[2]);
            ip[3] = long.Parse(s[3]);
 
            return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
        }
 
        /// <summary>
        /// 长整形 转换 IP
        /// </summary>
        /// <param name="longIP"></param>
        /// <returns></returns>
        public static string Long2IP(long longIP)
        {
 
 
            StringBuilder sb = new StringBuilder("");
            sb.Append(longIP >> 24);
            sb.Append(".");
 
            //将高8位置0，然后右移16为
 
 
            sb.Append((longIP & 0x00FFFFFF) >> 16);
            sb.Append(".");
 
 
            sb.Append((longIP & 0x0000FFFF) >> 8);
            sb.Append(".");
 
            sb.Append((longIP & 0x000000FF));
 
 
            return sb.ToString();
        }
 
        /// <summary>
        /// 将8位日期型整型数据转换为日期字符串数据
        /// </summary>
        /// <param name="date">整型日期</param>
        /// <param name="chnType">是否以中文年月日输出</param>
        /// <returns></returns>
        public static string FormatDate(int date, bool chnType)
        {
            string dateStr = date.ToString();
 
            if (date <= 0 || dateStr.Length != 8)
                return dateStr;
 
            if (chnType)
                return dateStr.Substring(0, 4) + "年" + dateStr.Substring(4, 2) + "月" + dateStr.Substring(6) + "日";
 
            return dateStr.Substring(0, 4) + "-" + dateStr.Substring(4, 2) + "-" + dateStr.Substring(6);
        }
 
 
        /// <summary>
        /// string型转换为bool型
        /// </summary>
        /// <param name="strValue">要转换的字符串</param>
        /// <param name="defValue">缺省值</param>
        /// <returns>转换后的bool类型结果</returns>
        public static bool StrToBool(object expression, bool defValue)
        {
            if (expression != null)
                return StrToBool(expression, defValue);
 
            return defValue;
        }
 
        /// <summary>
        /// string型转换为bool型
        /// </summary>
        /// <param name="strValue">要转换的字符串</param>
        /// <param name="defValue">缺省值</param>
        /// <returns>转换后的bool类型结果</returns>
        public static bool StrToBool(string expression, bool defValue)
        {
            if (expression != null)
            {
                if (string.Compare(expression, "true", true) == 0)
                    return true;
                else if (string.Compare(expression, "false", true) == 0)
                    return false;
            }
            return defValue;
        }