C#实现文件与二进制互转并存入数据库

这篇文章主要介绍了C#实现文件与二进制互转并存入数据库,本文直接给出代码实例,代码中包含详细注释,需要的朋友可以参考下

//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();

        

    }