原文发布时间为：2008-08-10 —— 来源于本人的百度文章 [由搬家工具导入]

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.IO;

/// <summary>
/// fileToData 的摘要说明
/// </summary>
public class fileToData
{
public fileToData()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}
    public static string FileToBinary(string fpath)
    {
        FileStream fs = new FileStream(fpath, FileMode.Open, FileAccess.Read);
        int fileLength = Convert.ToInt32(fs.Length);
        byte[] fileBytes = new byte[fileLength];
        BinaryReader br = new BinaryReader(fs);
        for (int i = 0; i < fileLength; i++)
        {
            br.Read(fileBytes, 0, fileLength);
        }
        br.Close();
        fs.Close();
        string strData = http://www.mamicode.com/Convert.ToBase64String(fileBytes);
        return strData;
    }

    public static void BinaryToFile(string fpath, string binary)
    {
        FileStream fs = new FileStream(fpath, FileMode.Create, FileAccess.Write);
        BinaryWriter bw = new BinaryWriter(fs);
        bw.Write(Convert.FromBase64String(binary));
        bw.Close();
        fs.Close();
    }

}

文件转换成二进制流及二进制流转换成文件