C#将相片转换成二进制存储在数据库中，再从数据库中显示出来

#region 用于在PictureBox控件中显示选择的图片
/// <summary>
/// 用于在PictureBox控件中显示选择的图片
/// </summary>
/// <param name="openF">图像名</param>
/// <param name="MyImage">pictureBox控件ID</param>
public void Read_Image(OpenFileDialog openF, PictureBox MyImage)//显示选择的图片
{
//指定OpenFileDialog控件打开的文件格式
openF.Filter = "*.jpg|*.jpg|*.bmp|*.bmp";
if (openF.ShowDialog()==DialogResult.OK)
{
try
{
//将图片文件存入到PictureBox控件中
MyImage.Image = System.Drawing.Image.FromFile(openF.FileName);
}
catch (Exception)
{
//弹出错误信息
MessageBox.Show("您选择的图片不能被读取或文件类型不对！","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
throw;
}
}
}

#endregion

#region 用于将图片以二进制形式存入数据库中
/// <summary>
/// 用于将图片以二进制形式存入数据库中
/// </summary>
/// <param name="FilmID">影片ID</param>
/// <param name="openF"></param>
public void SaveImage(string FilmID, OpenFileDialog openF)//将图片以二进制存入数据库中
{
string strimg = openF.FileName.ToString(); //记录图片的所在路径
FileStream fs = new FileStream(strimg, FileMode.Open, FileAccess.Read); //将图片以文件流的形式进行保存
BinaryReader br = new BinaryReader(fs);
byte[] imgBytesIn = br.ReadBytes((int)fs.Length);//将流读入到字节数组中
SqlConnection conn = sqlhelper.getcon();
conn.Open();
StringBuilder strSql = new StringBuilder();
strSql.Append("update T_Film Set F_FPhoto=@Photo where F_FId=" + FilmID);
SqlCommand cmd = new SqlCommand(strSql.ToString(), conn);
cmd.Parameters.Add("@Photo", SqlDbType.Binary).Value = imgBytesIn;
cmd.ExecuteNonQuery();
conn.Close();
}
#endregion

#region 用于将图片从数据库中取出并显示在PictureBox控件中
/// <summary>
/// 用于将图片从数据库中取出并显示在PictureBox控件中
/// </summary>
/// <param name="FilmID">影片ID</param>
/// <param name="pb">PictureBox控件ID</param>
public void Get_Image(string FilmID, PictureBox pb)//将图片从数据库中取出
{
byte[] imagebytes = null;
SqlConnection conn = sqlhelper.getcon();
conn.Open();
SqlCommand com = new SqlCommand("select * from T_Film where F_FId='" + FilmID + "'", conn);
SqlDataReader dr = com.ExecuteReader();
while (dr.Read())
{
imagebytes = (byte[])dr.GetValue(10);
}
dr.Close();
conn.Close();
MemoryStream ms = new MemoryStream(imagebytes);
Bitmap bmpt = new Bitmap(ms);
pb.Image = bmpt;
}
#endregion

上面三个分别为公共类，第一个为打开对话框，第二个为将图像以二进制存入数据库，第三个为从数据库中读取出来。

在窗体代码中， Mymenu.Get_Image(FilmID, picboxPhoto);直接用就可以了（Mymenu）为公共类空间名称