把圖片保存到數(shù)據(jù)庫中和從數(shù)據(jù)庫中讀取圖片

private void btnWrite_Click(object sender, EventArgs e)
 {
 OpenFileDialog ofd = new OpenFileDialog();
 ofd.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";

 if (ofd.ShowDialog() == DialogResult.OK)
 {
 string filePath = ofd.FileName;//圖片路徑
 FileStream fs = new FileStream(filePath, FileMode.Open);
 byte[] imageBytes = new byte[fs.Length];
 BinaryReader br = new BinaryReader(fs);
 imageBytes = br.ReadBytes(Convert.ToInt32(fs.Length));//圖片轉(zhuǎn)換成二進制流

 string strSql = string.Format("insert into [SBS].[dbo].[Model] ([M_QRCode],[M_Skills] ) values (@image,'2')");
 int count = Write(strSql,imageBytes );

 if (count > 0)
 {
 MessageBox.Show("success");
 }
 else
 {
 MessageBox.Show("failed");
 }
 }
 }

private int Write(string strSql,byte[] imageBytes)
 {
 string connStr = "Data Source=192.168.4.132;initial Catalog=SBS;User ID=sa;Password=sa;";

 using (SqlConnection conn = new SqlConnection(connStr))
 {
 using (SqlCommand cmd = new SqlCommand(strSql, conn))
 {
 try
 {
 conn.Open();
 SqlParameter sqlParameter = new SqlParameter("@image", SqlDbType.Image);
 sqlParameter.Value = imageBytes;
 cmd.Parameters.Add(sqlParameter);
 int rows = cmd.ExecuteNonQuery();
 return rows;
 }
 catch (Exception e)
 {
 throw;
 }
 }
 }
 }

private void btnRead_Click(object sender, EventArgs e)
 {
 string strSql = string.Format("select M_QRCode from [SBS].[dbo].[Model] where M_id = 7");//圖片保存的字段是M_QRCode
 Read(strSql);
 }

 private void Read(string strSql)
 {
 string connStr = "Data Source=192.168.4.132;initial Catalog=SBS;User ID=sa;Password=sa;";

 using (SqlConnection conn = new SqlConnection(connStr))
 {
 using (SqlCommand cmd = new SqlCommand(strSql, conn))
 {
 conn.Open();
 SqlDataReader sqlDr = cmd.ExecuteReader();
 sqlDr.Read();
 byte[] images = (byte[])sqlDr["M_QRCode"];
 MemoryStream ms = new MemoryStream(images);
 Bitmap bmp = new Bitmap(ms);
 pictureBox1.Image = bmp;
 }
 }
 }

private void btnLoad_Click(object sender, EventArgs e)
 {
 OpenFileDialog ofd = new OpenFileDialog();
 ofd.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";
 if (ofd.ShowDialog() == DialogResult.OK)
 {
 pictureBox1.Image = Image.FromFile(ofd.FileName);
 }
 }

private void btnPrint_Click(object sender, EventArgs e)
 {
 PrintDialog printDialog = new PrintDialog();
 printDialog.Document = this.printDocument1;
 if (printDialog.ShowDialog() == DialogResult.OK)
 {
 try
 {
 printDocument1.Print();
 }
 catch (Exception ex)
 {
 printDocument1.PrintController.OnEndPrint(printDocument1, new System.Drawing.Printing.PrintEventArgs());
 }
 }
 }

 private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
 {
 e.Graphics.DrawImage(pictureBox1.Image, 30, 30);
 }

 public byte[] ConvertBinary(string filePath)
 {
 FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);//以文件流形式讀取圖片
 BinaryReader br = new BinaryReader(fs);//轉(zhuǎn)換成二進制流
 byte[] imageBytes = br.ReadBytes((int)fs.Length);//保存到字節(jié)數(shù)組中

 return imageBytes;
 }

 public void ShowImage(byte[] imageBytes)
 {
 MemoryStream ms = new MemoryStream(imageBytes);
 pictureBox1.Image = Image.FromStream(ms);
 }

public void Method()
 {
 MemoryStream ms;
 pictureBox1.Image = Image.FromStream(ms);

 Bitmap bitmap;
 pictureBox1.Image = bitmap;

 string filePath;
 pictureBox1.Image = Image.FromFile(filePath);
 }

public void BindCombobox()
 {
 DataTable dt = new DataTable();
 dt.Columns.Add(new DataColumn("id", typeof(int)));
 dt.Columns.Add(new DataColumn("value", typeof(string)));

 for (int i = 0; i < 3; i++)
 {
 DataRow dr = dt.NewRow();
 dr["id"] = i;
 dr["value"] = 10 + i;
 dt.Rows.Add(dr);
 }

 this.comboBox1.DataSource = dt;
 this.comboBox1.DisplayMember = "value";
 this.comboBox1.ValueMember = "id"; 
 }

 public void ShowValue()
 {
 this.textBox1.Text = this.comboBox1.Text;
 this.textBox2.Text = this.comboBox1.SelectedValue.ToString();
 }