c＃图文混合，以二进制方式写入数据库

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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Data.OleDb;using System.IO;namespace _07_二进制保存数据库{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        //数据库连接字符串        private static readonly string connStr = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=DB.mdb");        MemoryStream StreamObject = null;        //写入到数据库  写入按钮**************************************************************        private void button1_Click(object sender, EventArgs e)        {            Byte[] bt;            //string str;            //使用内存流            using (MemoryStream savefilestream = new MemoryStream())            {                richTextBox1.SaveFile(savefilestream, RichTextBoxStreamType.RichText);                bt = savefilestream.ToArray();            }            //string sql = string.Format("insert into 表1(字段2)values(@字段2)");            string sql = string.Format("insert into 表1(字段2)values(@字段2)");            //string sql = "update Tab1 set [email protected] where id=1";            int a = CRdata(sql, "@字段2",bt);            if (a > 0)            {                MessageBox.Show("写入成功");            }        }        //从数据库中读取 读取按钮###############################################################        private void button2_Click(object sender, EventArgs e)        {            //select 列1, 列2, 列3 from 表名 where 字段1 = '4';            string sql1 = string.Format("select 字段2 from 表1 where ID=21");            //从数据库中读出数据             DataTable dt = DCdata(sql1);            byte[] bWrite = (byte[])dt.Rows[0][0];            //将数组转换成stream             System.IO.MemoryStream mstream = new System.IO.MemoryStream(bWrite, false);            //将stream填充到RichTextBox             this.richTextBox1.LoadFile(mstream, RichTextBoxStreamType.RichText);        }        /// <summary>        /// 文字加图片写入到数据库方法。二进制数组。        /// </summary>        /// <param name="sql"></param>        /// <param name="paramName"></param>        /// <param name="btArray"></param>        /// <returns></returns>        public static int CRdata(string sql,string paramName, byte[] btArray)        {            int returnResult = 0;            using (OleDbConnection conn = new OleDbConnection(connStr))            {                using (OleDbCommand comm = new OleDbCommand(sql, conn))                {                    conn.Open();                    //这一行决定是否写入成功。                    comm.Parameters.Add(paramName, OleDbType.Binary, btArray.GetLength(0)).Value = btArray;                    returnResult = comm.ExecuteNonQuery();                }                conn.Close();            }            return returnResult;        }        /// <summary>        /// 读取数据库方法        /// </summary>        /// <param name="sql"></param>        /// <param name="ReturnRowCounter"></param>        /// <returns></returns>        public static DataTable DCdata(string sql)        {            DataTable dt = new DataTable();            using (OleDbConnection conn = new OleDbConnection(connStr))            {                using (OleDbDataAdapter ADP = new OleDbDataAdapter(sql, conn))                {                    //ReturnRowCounter = ADP.Fill(dt);                    ADP.Fill(dt);                }            }            return dt;        }    }}

作者：雨天读书

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