網絡上的讀寫OLE對象的代碼是多，不過多是轉載的，大部分人從來都沒實際測試過，只是COPY來COPY去。我重來沒看到一個真正可以運行的東東。
沒辦法，只有自力更生，花了一點時間出了點研究成果，寫到這里做個記錄。

關鍵代碼如下：

******* void button1_Click(object sender, EventArgs e)? //寫入圖片
??????? {
????????????OpenFileDialog dlg = new OpenFileDialog();
??????????? dlg.Filter = "All?? Files|*.*";
??????????? if (dlg.ShowDialog() == DialogResult.OK)
??????????? {
??????????????? string fileName = dlg.FileName;

??????????????? FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
??????????????? byte[] buffer = new byte[fs.Length];
??????????????? fs.Read(buffer, 0, buffer.Length);
??????????????? fs.Close();

??????????????? //pictureBox1.Image = Image.FromFile(fileName);

??????????????? OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\db1.mdb" + ";Persist Security Info=True");
??????????????? cn.Open();

??????????????? OleDbCommand cmd = new OleDbCommand("INSERT INTO? list1(pic)? VALUES(@img)", cn);
??????????????? ((OleDbParameter)cmd.Parameters.Add("@img", OleDbType.Binary)).Value = buffer;
??????????????? cmd.ExecuteNonQuery();
??????????? }??
?

??????????
??? }

??????? ******* void button2_Click(object sender, EventArgs e)? //讀取圖片
??????? {
??????????? OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\db1.mdb" + ";Persist Security Info=True");
??????????? cn.Open();

??????????? OleDbDataAdapter oda = new OleDbDataAdapter("select? pic? from? list1 where 編號=10", cn);
???????????

??????????? DataTable dt = new DataTable();
??????????? oda.Fill(dt);

??????????? cn.Close();

??????????? byte[] buffer = dt.Rows[0][0] as byte[];
??????????? MemoryStream ms = new MemoryStream(buffer);

??????????? pictureBox1.Image = Image.FromStream(ms);
??????? }

??????? ******* void button3_Click(object sender, EventArgs e)? //寫入長文本
??????? {
??????????? OpenFileDialog dlg = new OpenFileDialog();
??????????? dlg.Filter = "TXT Files|*.txt";
??????????? if (dlg.ShowDialog() == DialogResult.OK)
??????????? {
??????????????? string fileName = dlg.FileName;

??????????????? FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
??????????????? byte[] buffer = new byte[fs.Length];
??????????????? fs.Read(buffer, 0, buffer.Length);
??????????????? fs.Close();

??????????????? //pictureBox1.Image = Image.FromFile(fileName);

??????????????? OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\db1.mdb" + ";Persist Security Info=True");
??????????????? cn.Open();

??????????????? OleDbCommand cmd = new OleDbCommand("INSERT INTO? list1(pic)? VALUES(@img)", cn);
??????????????? ((OleDbParameter)cmd.Parameters.Add("@img", OleDbType.Binary)).Value = buffer;
??????????????? cmd.ExecuteNonQuery();
??????????? }??
??????? }

??????? ******* void button4_Click(object sender, EventArgs e)? //載入長文本
??????? {
??????????? OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\db1.mdb" + ";Persist Security Info=True");
??????????? cn.Open();

??????????? OleDbDataAdapter oda = new OleDbDataAdapter("select? pic? from? list1 where 編號=12", cn);

??????????? DataTable dt = new DataTable();
??????????? oda.Fill(dt);

??????????? cn.Close();

??????????? byte[] buffer = dt.Rows[0][0] as byte[];
??????????? //MemoryStream ms = new MemoryStream(buffer);
??????????? richTextBox1.Text =System.Text.Encoding.Default.GetString(buffer);

??????? }

轉載于:https://www.cnblogs.com/hackpig/archive/2010/02/15/1668441.html

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