ReadImage.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Data.SqlClient;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace eMeng.Exam.DataGridShowImage
{
  /// <summary>
  /// ReadImage 的摘要说明。
  /// </summary>
  public class ReadImage : System.Web.UI.Page
  {
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   string strImageID = Request.QueryString["id"];
   SqlConnection myConnection = new SqlConnection("Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;");
   SqlCommand myCommand = new SqlCommand("Select PersonImageType, PersonImage from Person Where PersonID=" 
    + strImageID, myConnection);

   try
   {
    myConnection.Open();
    SqlDataReader myDataReader;
    myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
    if(myDataReader.Read())
    {
     Response.Clear();

     Response.ContentType = myDataReader["PersonImageType"].ToString();
     Response.BinaryWrite((byte[])myDataReader["PersonImage"]);
    }
    myConnection.Close();
   }
   catch (SqlException SQLexc)
   {
   }
   Response.End();
  }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
      //
      InitializeComponent();
      base.OnInit(e);
    }
        
    /// <summary>
    /// 设计器支持所需的方法 - 不要使用代码编辑器修改
    /// 此方法的内容。
    /// </summary>
    private void InitializeComponent()
    {    
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
  }
}

------解决方案--------------------
lz参考下 图片转成2进制 放入数据库 asp.net 上
C# code

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (FileUpload1.PostedFile.FileName != "")
            {
                string name = FileUpload1.PostedFile.FileName;
                string type = name.Substring(name.LastIndexOf(".") + 1);
                FileStream fs = File.OpenRead(name);
                byte[] content = new byte[fs.Length];
                fs.Read(content, 0, content.Length);
                fs.Close();
                SqlConnection con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]);
                SqlCommand cmd = con.CreateCommand();
                con.Open();
                cmd.CommandText = "insert into test(image_data) values (@image_data)";
                cmd.CommandType = CommandType.Text;
                if (type == "jpg" || type == "gif" || type == "bmp" || type == "png")
                {
                    SqlParameter para = cmd.Parameters.Add("@image_data", SqlDbType.Image);
                    para.Value = content;
                    cmd.ExecuteNonQuery();
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('上传成功！')</script>");
                }
            }
            else { Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('请选择图片类型的文件！')</script>"); }
        }