把RichTextBox中的文本保存到Sql Server中（C#）[转载

原文地址：http://www.developer.com/net/net/article.php/11087_3373951_1
保存：
private void btnSave_Click(object sender, System.EventArgs e) { FileStream stream = null; SqlConnection conn = null; SqlCommand cmd = null; try { richTextBox1.SaveFile( "temp.rtf" ); stream = new FileStream("temp.rtf", FileMode.Open, FileAccess.Read); int size = Convert.ToInt32(stream.Length); Byte[] rtf = new Byte[size]; stream.Read(rtf, 0, size);
conn = new SqlConnection("Database=Northwind;Integrated Security=true;"); conn.Open(); cmd = new SqlCommand("UPDATE Employees SET Photo=@Photo WHERE EmployeeID=1", conn);
SqlParameter paramRTF = new SqlParameter("@Photo", SqlDbType.Image, rtf.Length, ParameterDirection.Input, false, 0,0,null, DataRowVersion.Current, rtf); cmd.Parameters.Add(paramRTF); int rowsUpdated = Convert.ToInt32(cmd.ExecuteNonQuery()); MessageBox.Show(String.Format("{0} rows updated", rowsUpdated)); } catch(Exception ex) { MessageBox.Show(ex.Message); } finally { if ( stream != null ) stream.Close(); if (cmd != null ) cmd.Parameters.Clear(); if (conn != null) conn.Close(); } }
读取：
private void btnLoad_Click(object sender, System.EventArgs e) { richTextBox1.Clear();
SqlConnection cn = null; SqlCommand cmd = null; SqlDataReader reader = null; try { cn = new SqlConnection("Database=Northwind;Integrated Security=true;"); cn.Open(); cmd = new SqlCommand("SELECT Photo FROM Employees WHERE EmployeeID=1", cn); reader = cmd.ExecuteReader(); reader.Read(); if (reader.HasRows) { if (!reader.IsDBNull(0)) { Byte[] rtf = new Byte[Convert.ToInt32((reader.GetBytes(0, 0, null, 0, Int32.MaxValue)))]; long bytesReceived = reader.GetBytes(0, 0, rtf, 0, rtf.Length); ASCIIEncoding encoding = new ASCIIEncoding(); richTextBox1.Rtf = encoding.GetString(rtf, 0, Convert.ToInt32(bytesReceived)); } } } catch(Exception ex) { MessageBox.Show(ex.Message); } finally { if (reader != null ) reader.Close(); if (cn != null ) cn.Close(); }
}