图片保存到数据库的方法:
public void imgToDB(string sql)
{ //参数sql中要求保存的imge变量名称为@images
//调用方法如:imgToDB("update UserPhoto set Photo=@images where UserNo='" + temp + "'");
FileStream fs = File.OpenRead(t_photo.Text);
byte[] imageb = new byte[fs.Length];
fs.Read(imageb, 0, imageb.Length);
fs.Close();
SqlCommand com3 = new SqlCommand (sql,con);
com3.Parameters.Add("@images", SqlDbType.Image).Value = imageb;
if (com3.Connection.State == ConnectionState.Closed)
com3.Connection.Open();
try
{
com3.ExecuteNonQuery();
}
catch
{ }
finally
{ com3.Connection.Close(); }
}
数据库中读出图片并显示在picturebox中:
方法一:
private void ShowImage(string sql)
{
//调用方法如:ShowImage("select Photo from UserPhoto where UserNo='" + userno +"'");
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
byte[] b= (byte[])cmd.ExecuteScalar();
if (b.Length 〉 0)
{
MemoryStream stream = new MemoryStream(b, true);
stream.Write(b, 0, b.Length);
pictureBox1.Image = new Bitmap(stream);
stream.Close();
}
conn.Close();
}
方法二:当在dg中选中某行时:
private void dg_MouseUp(object sender, MouseEventArgs e)
{
//整行选择
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{//用户编号,姓名,性别,身份证号,籍贯,学院,系所,校区,部门,电话,照片
//显示相片
object imgobj=dg[10, dg.CurrentRow.Index].Value;
if (imgobj != null && !Convert.IsDBNull(imgobj))
{
byte[] imgb = (byte[])imgobj;
MemoryStream memStream = new MemoryStream(imgb);
try
{
Bitmap myimge = new Bitmap(memStream);
this.pictureBox1.Image = myimge;
}
catch
{
DB.msgbox("从数据库读取相片失败!");
}
}
else
pictureBox1.Image = null;
}
使用C#进行图片的数据库存取
本文总结如何在.Net WinForm和.Net WebForm(asp.net)中将图片存入SQL Server中并读取显示的方法 。
1.使用asp.net将图片上传并存入SQL Server中,然后从SQL Server中读取并显示出来:
1)上传并存入SQL Server
数据库结构
create table test
{
id identity(1,1),
FImage image
}
相关的存储过程
Create proc UpdateImage
(
@UpdateImage Image
)
As
Insert Into test(FImage) values(@UpdateImage)
GO
在UpPhoto.aspx文件中添加如下:
<input ]);
Response.End();
reader.Close();
}
}
2.在WinForm中将图片存入SQL Server,并从SQL Server中读取并显示在picturebox中
1),存入SQL Server
数据库结构和使用的存储过过程,同上面的一样
首先,在窗体中加一个OpenFileDialog控件,命名为ofdSelectPic ;
然后,在窗体上添加一个打开文件按钮,添加如下单击事件代码:
Stream ms;
byte[] picbyte;
//ofdSelectPic.ShowDialog();
if (ofdSelectPic.ShowDialog()==DialogResult.OK)
{
if ((ms=ofdSelectPic.OpenFile())!=null)
{
//MessageBox.Show("ok");
picbyte=new byte[ms.Length];
ms.Position=0;
ms.Read(picbyte,0,Convert.ToInt32(ms.Length));
//MessageBox.Show("读取完毕!");
//连接数据库
SqlConnection conn=new SqlConnection();
conn.ConnectionString="Data Source=localhost;Database=test;User Id=sa;Pwd=sa";
SqlCommand cmd=new SqlCommand("UpdateImage",conn);
cmd.CommandType=CommandType.StoredProcedure;
cmd.Parameters.Add("@UpdateImage",SqlDbType.Image);
cmd.Parameters["@UpdateImage"].Value=picbyte;
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
ms.Close();
}
}
2)读取并显示在picturebox中
首先,添加一个picturebox,名为ptbShow
然后,添加一个按钮,添加如下响应事件:
SqlConnection conn=new SqlConnection();
conn.ConnectionString="Data Source=localhost;Database=test;User Id=sa;Pwd=sa";
string strSql="select FImage from test where id=1";
SqlCommand cmd=new SqlCommand(strSql,conn);
conn.Open();
SqlDataReader reader=cmd.ExecuteReader();
reader.Read();
MemoryStream ms=new MemoryStream((byte[])reader["FImage"]);
Image image=Image.FromStream(ms,true);
reader.Close();
conn.Close();
ptbShow.Image=image;