将文件转换成base64字节码和base64编码的字符串保存为文件

/// <summary> 
        /// 对任意类型的文件进行base64加码 
        /// </summary> 
        /// <param name="filePath">文件的路径和文件名 </param> 
        /// <returns>对文件进行base64编码后的字符串 </returns> 
        public static string FileToString(string filePath) 
        { 
            if (!string.IsNullOrEmpty(filePath) && File.Exists(filePath)) 
            { 
                System.IO.FileStream fs = System.IO.File.OpenRead(filePath); 
                System.IO.BinaryReader br = new System.IO.BinaryReader(fs); 

                string base64String = Convert.ToBase64String(br.ReadBytes((int)fs.Length)); 

                br.Close(); 
                fs.Close(); 
                return base64String; 
            } 
            else 
            { 
                return ""; 
            } 
        }

 



  /// <summary> 
        /// 把经过base64编码的字符串保存为文件 
        /// </summary> 
        /// <param name="base64String">经base64加码后的字符串 </param> 
        /// <param name="fileName">保存文件的路径和文件名 </param> 
        /// <returns>保存文件是否成功 </returns> 
        public static bool StringToFile(string base64String, string fileName) 
        { 
            //string path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase) + @"/beapp/" + fileName; 
          
            System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create); 
            System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs); 
            if (!string.IsNullOrEmpty(base64String) && File.Exists(fileName)) 
            { 
                bw.Write(Convert.FromBase64String(base64String)); 
            } 
            bw.Close(); 
            fs.Close(); 
            return true; 
        }