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(); }
