网上关于ASP.NET上传图片到数据库的资料非常多，常用的如下:
存储图片类型数据有以下几种方式：
1.将图片转换为二进制数组（byte[]）
byte
[] fileData
=
this
.FileUpload1.FileBytes;
2. 根据路径将文件转换为2进制数组
代码
public
byte
[] returnbyte(
string
strpath)
{
// 以二进制方式读文件
FileStream fsMyfile = new FileStream(strpath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
// 创建一个二进制数据流读入器，和打开的文件关联
BinaryReader brMyfile = new BinaryReader(fsMyfile);
// 把文件指针重新定位到文件的开始
brMyfile.BaseStream.Seek( 0 , SeekOrigin.Begin);
byte [] bytes = brMyfile.ReadBytes(Convert.ToInt32(fsMyfile.Length.ToString()));
// 关闭以上new的各个对象
brMyfile.Close();
return bytes;
}
{
// 以二进制方式读文件
FileStream fsMyfile = new FileStream(strpath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
// 创建一个二进制数据流读入器，和打开的文件关联
BinaryReader brMyfile = new BinaryReader(fsMyfile);
// 把文件指针重新定位到文件的开始
brMyfile.BaseStream.Seek( 0 , SeekOrigin.Begin);
byte [] bytes = brMyfile.ReadBytes(Convert.ToInt32(fsMyfile.Length.ToString()));
// 关闭以上new的各个对象
brMyfile.Close();
return bytes;
}
3img 类型得到二进制数组
代码
public
static
byte
[] Getbyte(Image img)
{
MemoryStream stream = new MemoryStream();
img.Save(stream, ImageFormat.Jpeg);
byte [] mydata = new byte [stream.Length];
mydata = stream.ToArray();
stream.Close();
return mydata;
}
{
MemoryStream stream = new MemoryStream();
img.Save(stream, ImageFormat.Jpeg);
byte [] mydata = new byte [stream.Length];
mydata = stream.ToArray();
stream.Close();
return mydata;
}
读取image类型的数据并显示在网页上的方式如下：
1。直接返回image 类型
代码
private
System.Drawing.Image getImageDataFromOracle()
{
string sql = " select IMGDATA from t_img where imgID=100 " ;
string strconn = System.Configuration.ConfigurationManager.ConnectionStrings[ " ConnectionStringForOracle " ].ToString();
OracleConnection oraConn = new OracleConnection(strconn);
OracleCommand oraComm = new OracleCommand(sql, oraConn);
oraConn.Open();
byte [] fileData = ( byte [])oraComm.ExecuteScalar();
oraConn.Close();
System.IO.MemoryStream ms = new System.IO.MemoryStream(fileData);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
return img;
}
{
string sql = " select IMGDATA from t_img where imgID=100 " ;
string strconn = System.Configuration.ConfigurationManager.ConnectionStrings[ " ConnectionStringForOracle " ].ToString();
OracleConnection oraConn = new OracleConnection(strconn);
OracleCommand oraComm = new OracleCommand(sql, oraConn);
oraConn.Open();
byte [] fileData = ( byte [])oraComm.ExecuteScalar();
oraConn.Close();
System.IO.MemoryStream ms = new System.IO.MemoryStream(fileData);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
return img;
}
2.利用页面输入来显示图片
页面ImageShow.aspx （Page_Load方法）
代码
protected
void
Page_Load(
object
sender, EventArgs e)
{
byte [] b_logoImg = ( byte [])dt_channelImg.Rows[ 0 ][ " LogoImage " ]; // 得到byte[] 数组，这里只是举个例子
if (b_logoImg.Length > 0 )
{
System.Drawing.Image logoImg;
MemoryStream ms = new MemoryStream(b_logoImg);
Response.Clear();
Response.ContentType = " image/gif " ;
Response.OutputStream.Write(b_logoImg, 0 , b_logoImg.Length);
Response.End();
}
}
{
byte [] b_logoImg = ( byte [])dt_channelImg.Rows[ 0 ][ " LogoImage " ]; // 得到byte[] 数组，这里只是举个例子
if (b_logoImg.Length > 0 )
{
System.Drawing.Image logoImg;
MemoryStream ms = new MemoryStream(b_logoImg);
Response.Clear();
Response.ContentType = " image/gif " ;
Response.OutputStream.Write(b_logoImg, 0 , b_logoImg.Length);
Response.End();
}
}
图片路径写成为：<img src = "ImageShow.aspx" />