Question

C#.NET中关于从数据库中读取与写入显示多个图片的问题。

我只是个初学者，能否给我一个简单的实例(前台、后台)。谢谢。数据库中的图片是image格式的。

Answer 1

//SQL存入图片方法
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";
if(openFileDialog1.ShowDialog()==DialogResult.OK)
{
string fullpath =openFileDialog1.FileName;//文件路径
FileStream fs = new FileStream(fullpath, FileMode.Open); //读取图片
byte[] imagebytes =new byte[fs.Length];//
BinaryReader br = new BinaryReader(fs);
imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("insert into tb_08 values(@ImageList)",con);
com.Parameters.Add("ImageList", SqlDbType.Image);
com.Parameters["ImageList"].Value = imagebytes;
com.ExecuteNonQuery();
con.Close();
}
}
//SQL取出图片方法
private void button1_Click(object sender, EventArgs e)
{
byte[] imagebytes = null;
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("select top 1* from tb_09", con);
SqlDataReader dr = com.ExecuteReader();
while (dr.Read())
{
imagebytes = (byte[])dr.GetValue(1);
}
dr.Close();
com.Clone();
con.Close();
MemoryStream ms = new MemoryStream(imagebytes);
Bitmap bmpt = new Bitmap(ms);
pictureBox1.Image = bmpt;
}