C# 文件与二进制互转数据库写入读出

       //这个方法是浏览文件对象
       private void button1_Click(object sender, EventArgs e)
       {
           //用户打开文件浏览
           using (OpenFileDialog dialog = new OpenFileDialog())
           {
               //只能单选一个文件
               dialog.Multiselect = false;
               //选择一个文件
               if (dialog.ShowDialog() == DialogResult.OK)
               {
                   try
                   {
                       //把选择的文件路径给txtPath
                       this.textBox1.Text = dialog.FileName;
                   }
                   catch (Exception ex)
                   {
                       //抛出异常
                       throw (ex);
                   }
               }
           }
       }

       //关闭
       private void button3_Click(object sender, EventArgs e)
       {
           this.Close();
       }

       //把文件转成二进制流出入数据库
       private void button2_Click(object sender, EventArgs e)
       {
           FileStream fs = new FileStream(textBox1.Text, FileMode.Open);
           BinaryReader br = new BinaryReader(fs);
           Byte[] byData = br.ReadBytes((int)fs.Length);
           fs.Close();
           string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
           SqlConnection myconn = new SqlConnection(conn);
           myconn.Open();
           string str = "insert into pro_table (pro_name,pro_file) values('测试文件',@file)";
           SqlCommand mycomm = new SqlCommand(str, myconn);
           mycomm.Parameters.Add("@file", SqlDbType.Binary, byData.Length);
           mycomm.Parameters["@file"].Value = byData;
           mycomm.ExecuteNonQuery();
           myconn.Close();
       }

       //从数据库中把二进制流读出写入还原成文件
       private void button4_Click(object sender, EventArgs e)
       {
           string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
           string str = "select pro_file from pro_table where pro_name='测试文件' ";
           SqlConnection myconn = new SqlConnection(conn);
           SqlDataAdapter sda = new SqlDataAdapter(str, conn);
           DataSet myds = new DataSet();
           myconn.Open();
           sda.Fill(myds);
           myconn.Close();
           Byte[] Files = (Byte[])myds.Tables[0].Rows[0]["pro_file"];
           BinaryWriter bw = new BinaryWriter(File.Open("D:\2.rdlc",FileMode.OpenOrCreate));
           bw.Write(Files);
           bw.Close();

       }

这个是项目中解决把报表rdlc存入数据库后再次读出还原出来的方法（经过测试 对任何文件对有效[音频文件，压缩包，word文档等]）

这里可能有人会问rdlc是xml的为什么不直接操作XML的存储呢？主要是我们项目中rdlc中可能有带有图片的rdlc格式 所以索性就直接二进制流化处理了。