Question

C#中怎么从数据库中读取二进制图片

要具体详细点的代码

Answer 1

创建一个BtnShow按钮，然后添加以下代码: private void BtnShow_Click(object sender, System.EventArgs e) { SqlConnection conn=new SqlConnection(ConnectString); string strSql="SELECT Photo from Picture where StudentID="1:; SqlCommand cmd=new SqlCommand(strSql,conn); conn.Open(); SqlDataReader reader=cmd.ExecuteReader(); reader.Read(); MemoryStream ms=new MemoryStream((byte[])reader["Photo"]); //创建一个内存 读取数据流，将读取的数据库的图片以二进制的byte[]流存入内存中。 reader.Close(); conn.Close(); StudentPhoto.Image=Image.FromStream(ms,true); //从刚才存储到内存的数据流中创建Image对象。 StudentPhoto.SizeMode=PictureBoxSizeMode.CenterIma;}---------还有一个更好的方法，请参考： http://www.diybl.com/course/4_webprogram/asp.net/netjs/2008410/109033.html

Answer 2

DataSet dataset = new DataSet();
sqlDataAdapter.Fill(dataset, "GridView");

if (dataset.Tables["GridView"].Rows.Count == 0)
{

}
else
{
this.Response.ContentType = "image/gif";
this.Response.BinaryWrite((byte[])(dataset.Tables["GridView"].Rows[0]["Pic"]));
}
这是我原来写的,你看下,也没时间该,你看下行不行

Answer 3

SqlDataReader dr = com.ExecuteReader();
while (dr.Read())
{
imagebytes = (byte[])dr.GetValue(11);
}
dr.Close();
conn.Close();
MemoryStream ms = new MemoryStream(imagebytes);
Bitmap bmpt = new Bitmap(ms);
pb.Image = bmpt;

Answer 4

图片是存在SQL里的吗？