本文实例讲述了C#操作数据库中存取图片文件的方法。分享给大家供大家参考。具体如下：
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private string sqlconnstr = "Data Source=.;Database=db_test;User id=sa;PWD=123456";
/*功能：把一种图片插入到数据库中
*返回值：无
*/
void InsertImageToDB()
{
//将需要存储的图片读取为数据流
FileStream fs = new FileStream(@"D:/Bear.jpg", FileMode.Open, FileAccess.Read);
Byte[] byte_fs = new byte[fs.Length];
fs.Read(byte_fs, 0, Convert.ToInt32(fs.Length));
fs.Close();
//建立数据库连接
SqlConnection conn = new SqlConnection(sqlconnstr);
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "insert into tb_test(image_id,image_file) values(@image_id,@image_file)";
SqlParameter[] param = new SqlParameter[2];
param[0] = new SqlParameter("@image_id", SqlDbType.Int);
param[0].Value = 1;
param[1] = new sqlParameter("@image_file", SqlDbType.Image);
param[1].Value = byte_fs;
for (int index = 0; index < 2; index++)
{
cmd.Parameters.Add(param[i]);
}
//执行SQL语句
cmd.ExecuteNonQuery();
conn.Close();
}
/*功能：从数据库中读取图像文件，并显示在PictureBox控件中
*返回值：无
*/
void GetImageFromDB()
{
byte[] Data = new byte[0];
//建立数据库连接
SqlConnection conn = new SqlConnection(sqlconnstr);
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from tb_parent";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
Data = (byte[])sdr["parent_image"];//读取第一个图片的位流
MemoryStream mystream = new MemoryStream(Data);
//用指定的数据流来创建一个image图片
System.Drawing.Image picbImage = System.Drawing.Image.FromStream(mystream, true);
mystream.Close();
picturebox1.Image = picbImage;
conn.Close();
}
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希望本文所述对大家的C#程序设计有所帮助。