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常用工具集/Utility/Security/Base64Helper.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace CCS.Utility.Security
+{
+    public static class Base64Helper
+    {
+        #region Base64加密解密
+        /// <summary>
+        /// Base64加密，采用指定字符编码方式加密。
+        /// </summary>
+        /// <param name="input">待加密的明文</param>
+        /// <param name="encode">字符编码</param>
+        /// <returns></returns>
+        public static string Base64Encrypt(this string input, Encoding encode)
+        {
+            return Convert.ToBase64String(encode.GetBytes(input));
+        }
+
+        /// <summary>
+        /// Base64加密，采用UTF8编码方式加密。
+        /// </summary>
+        /// <param name="input">待加密的明文</param>
+        /// <returns></returns>
+        public static string Base64Encrypt(this string input)
+        {
+            return Base64Encrypt(input, new UTF8Encoding());
+        }
+
+        /// <summary>
+        /// Base64解密，采用UTF8编码方式解密。
+        /// </summary>
+        /// <param name="input">待解密的秘文</param>
+        /// <returns></returns>
+        public static string Base64Decrypt(this string input)
+        {
+            return Base64Decrypt(input, new UTF8Encoding());
+        }
+
+        /// <summary>
+        /// Base64解密，采用指定字符编码方式解密。
+        /// </summary>
+        /// <param name="input">待解密的秘文</param>
+        /// <param name="encode">字符的编码</param>
+        /// <returns></returns>
+        public static string Base64Decrypt(this string input, Encoding encode)
+        {
+            return encode.GetString(Convert.FromBase64String(input));
+        }
+        #endregion
+
+        /// <summary>
+        /// 文件转base64字符串
+        /// </summary>
+        /// <param name="filePath"></param>
+        /// <returns></returns>
+        public static string FileToBase64(string filePath)
+        {
+            try
+            {
+                string base64Str;
+                using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
+                {
+                    byte[] bt = new byte[fileStream.Length];
+                    // 调用read读取方法  
+                    fileStream.Read(bt, 0, bt.Length);
+                    base64Str = Convert.ToBase64String(bt);
+                }
+                return base64Str;
+            }
+            catch
+            {
+                return "";
+            }
+        }
+
+        /// <summary>
+        /// base64字符串转文件字节数组
+        /// </summary>
+        /// <param name="base64"></param>
+        /// <returns></returns>
+        public static byte[] FileFromBase64(string base64)
+        {
+            return Convert.FromBase64String(base64);
+        }
+
+
+
+        /// <summary>  
+        /// 将传进来的文件转换成字符串  
+        /// </summary>  
+        /// <param name="FilePath">待处理的文件路径(本地或服务器)</param>  
+        /// <returns></returns>
+        public static string FileToBinary(string filePath)
+        {
+            //利用新传来的路径实例化一个FileStream对像  
+            System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
+            //得到对象的大小
+            int fileLength = Convert.ToInt32(fs.Length);
+            //声明一个byte数组 
+            byte[] fileByteArray = new byte[fileLength];
+            //声明一个读取二进流的BinaryReader对像
+            System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
+            for (int i = 0; i < fileLength; i++)
+            {
+                //将数据读取出来放在数组中 
+                br.Read(fileByteArray, 0, fileLength);
+            }
+            //装数组转换为String字符串
+            string strData = Convert.ToBase64String(fileByteArray);
+            br.Close();
+            fs.Close();
+            return strData;
+        }
+
+        /// <summary>  
+        /// 将传进来的字符串保存为文件  
+        /// </summary>  
+        /// <param name="path">需要保存的位置路径</param>  
+        /// <param name="binary">需要转换的字符串</param>  
+        public static void BinaryToFile(string path, string binary)
+        {
+            System.IO.FileStream fs = new System.IO.FileStream(path, System.IO.FileMode.Create, System.IO.FileAccess.Write);
+            //利用新传来的路径实例化一个FileStream对像  
+            System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);
+            //实例化一个用于写的BinaryWriter  
+            byte[] buffer = Convert.FromBase64String(binary);
+            bw.Write(buffer);
+            bw.Close();
+            fs.Close();
+        }
+    }
+}