存取显示Image类型的字段

using System;using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

  Int32 FileLength = 0;

  protected void Page_Load(object sender, EventArgs e)

  {

  }

//存储

  protected void Button1_Click(object sender, EventArgs e)

  {

  HttpPostedFile UpFile = UP_File.PostedFile;//HttpPostedFile对象，用于读取图象文件属性  

  FileLength = UpFile.ContentLength;

  try

  {

  if (FileLength == 0)

  {

  lblMessage.Text = "<b>请选择您要上传的文件</b>";

  }

  else

  {

  Byte[] FileByteArray = new byte[FileLength]; //图象文件临时储存Byte数组  

  Stream StreamObj = UpFile.InputStream;//建立数据流对像  

  //读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度  

  StreamObj.Read(FileByteArray, 0, FileLength);

  SqlConnection Con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]);

  String SqlCmd = "INSERT INTO ImageStore (ImageData,ImageContentType,ImageDescription,ImageSize) VALUES (@Image,@ContentType,@ImageDescription,@ImageSize)";

  SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);

  CmdObj.Parameters.Add("@Image", SqlDbType.Binary, FileLength).Value = FileByteArray;

  CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar, 50).Value = UpFile.ContentType;//记录文件类型  

  //把其它单表数据记录上传  

  CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar, 200).Value = txtDescription.Text;

  //记录文件长度，读取时使用  

  CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt, 8).Value = UpFile.ContentLength;

  Con.Open();

  CmdObj.ExecuteNonQuery();

  Con.Close();

  lblMessage.Text = "<p><b>OK!你已经成功上传你的图片</b>";//提示上传成功  

  }

  }

  catch (Exception ex)

  {

  lblMessage.Text = ex.Message.ToString();

  }

  }

//读取

 private void ImgDataRead()

  {

  int ImgID = Convert.ToInt32(Request.QueryString["id"]);

  SqlConnection Con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]);

  String SqlCmd = "SELECT * FROM ImageStore WHERE ID = @ImageID";

  SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);

  CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID;

  Con.Open();

  SqlDataReader SqlReader = CmdObj.ExecuteReader();

  SqlReader.Read();

  Response.ContentType = (string)SqlReader["ImageContentType"];//设定输出文件类型  

  //输出图象文件二进制数制

   

  Response.OutputStream.Write((byte[])SqlReader["ImageData"],0,Convert.ToInt32(SqlReader["ImageSize"]));

  Response.BufferOutput = true;

  Con.Close();  

  }

}