PersonalBlog/PersonalBlog/Tools/ConvertHelper.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace PersonalBlog.Tools
{
    /// <summary>
    /// 处理数据类型转换，数制转换、编码转换相关的类
    /// </summary>
    public class ConvertHelper
    {
        #region 补足位数
        /// <summary>
        /// 指定字符串的固定长度，如果字符串小于固定长度，
        /// 则在字符串的前面补足零，可设置的固定长度最大为9位
        /// </summary>
        /// <param name="text">原始字符串</param>
        /// <param name="limitedLength">字符串的固定长度</param>
        public static string RepairZero(string text, int limitedLength)
        {
            //补足0的字符串
            string temp = "";

            //补足0
            for (int i = 0; i < limitedLength - text.Length; i++)
            {
                temp += "0";
            }

            //连接text
            temp += text;

            //返回补足0的字符串
            return temp;
        }
        #endregion

        #region 各进制数间转换
        /// <summary>
        /// 实现各进制数间的转换。ConvertBase("15",10,16)表示将十进制数15转换为16进制的数。
        /// </summary>
        /// <param name="value">要转换的值,即原值</param>
        /// <param name="from">原值的进制,只能是2,8,10,16四个值。</param>
        /// <param name="to">要转换到的目标进制，只能是2,8,10,16四个值。</param>
        public static string ConvertBase(string value, int from, int to)
        {
            try
            {
                int intValue = Convert.ToInt32(value, from);  //先转成10进制
                string result = Convert.ToString(intValue, to);  //再转成目标进制
                if (to == 2)
                {
                    int resultLength = result.Length;  //获取二进制的长度
                    switch (resultLength)
                    {
                        case 7:
                            result = "0" + result;
                            break;
                        case 6:
                            result = "00" + result;
                            break;
                        case 5:
                            result = "000" + result;
                            break;
                        case 4:
                            result = "0000" + result;
                            break;
                        case 3:
                            result = "00000" + result;
                            break;
                    }
                }
                return result;
            }
            catch
            {

                //LogHelper.WriteTraceLog(TraceLogLevel.Error, ex.Message);
                return "0";
            }
        }
        #endregion

        #region 使用指定字符集将string转换成byte[]
        /// <summary>
        /// 使用指定字符集将string转换成byte[]
        /// </summary>
        /// <param name="text">要转换的字符串</param>
        /// <param name="encoding">字符编码</param>
        public static byte[] StringToBytes(string text, Encoding encoding)
        {
            return encoding.GetBytes(text);
        }
        #endregion

        #region 使用指定字符集将byte[]转换成string
        /// <summary>
        /// 使用指定字符集将byte[]转换成string
        /// </summary>
        /// <param name="bytes">要转换的字节数组</param>
        /// <param name="encoding">字符编码</param>
        public static string BytesToString(byte[] bytes, Encoding encoding)
        {
            return encoding.GetString(bytes);
        }
        #endregion

        #region 将byte[]转换成int
        /// <summary>
        /// 将byte[]转换成int
        /// </summary>
        /// <param name="data">需要转换成整数的byte数组</param>
        public static int BytesToInt32(byte[] data)
        {
            //如果传入的字节数组长度小于4,则返回0
            if (data.Length < 4)
            {
                return 0;
            }

            //定义要返回的整数
            int num = 0;

            //如果传入的字节数组长度大于4,需要进行处理
            if (data.Length >= 4)
            {
                //创建一个临时缓冲区
                byte[] tempBuffer = new byte[4];

                //将传入的字节数组的前4个字节复制到临时缓冲区
                Buffer.BlockCopy(data, 0, tempBuffer, 0, 4);

                //将临时缓冲区的值转换成整数，并赋给num
                num = BitConverter.ToInt32(tempBuffer, 0);
            }

            //返回整数
            return num;
        }
        #endregion

        #region Bitmap 和 byte[] 互相转换
        /// <summary>
        /// byte[] 转换 Bitmap  
        /// </summary>
        /// <param name="Bytes"></param>
        /// <returns></returns>
        public static Bitmap BytesToBitmap(byte[] Bytes)
        {
            MemoryStream stream = null;
            try
            {
                stream = new MemoryStream(Bytes);
                return new Bitmap((Image)new Bitmap(stream));
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            catch (ArgumentException ex)
            {
                throw ex;
            }
            finally
            {
                stream.Close();
            }
        }

        /// <summary>
        /// Bitmap转byte[]    
        /// </summary>
        /// <param name="Bitmap"></param>
        /// <returns></returns>
        public static byte[] BitmapToBytes(Bitmap bitmap)
        {
            MemoryStream ms = null;
            try
            {
                ms = new MemoryStream();
                bitmap.Save(ms, ImageFormat.Jpeg);
                byte[] byteImage = new Byte[ms.Length];
                byteImage = ms.ToArray();
                return byteImage;
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            finally
            {
                ms.Close();
            }
        }
        #endregion

        /// <summary>
        /// byte[]转换成Image
        /// </summary>
        /// <param name="byteArrayIn">二进制图片流</param>
        /// <returns>Image</returns>
        public static System.Drawing.Image byteArrayToImage(byte[] byteArrayIn)
        {
            if (byteArrayIn == null)
                return null;
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArrayIn))
            {
                System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);
                ms.Flush();
                return returnImage;
            }
        }

        /// <summary>
        /// 将图片Image转换成Byte[]
        /// </summary>
        /// <param name="Image">image对象</param>
        /// <param name="imageFormat">后缀名</param>
        /// <returns></returns>
        public static byte[] ImageToBytes(Image Image, System.Drawing.Imaging.ImageFormat imageFormat)
        {
            if (Image == null) { return null; }
            byte[] data = null;
            using (MemoryStream ms = new MemoryStream())
            {
                using (Bitmap Bitmap = new Bitmap(Image))
                {

                    Bitmap.Save(ms, imageFormat);
                    ms.Position = 0;
                    data = new byte[ms.Length];
                    ms.Read(data, 0, Convert.ToInt32(ms.Length));
                    ms.Flush();
                }
            }
            return data;
        }

    }
}