用C#实现图片数据库存储与显示

1.图片文件的存储，代码如下：(processImage.aspx)

<% @ Page language="c#" Codebehind="imageProcess.aspx.cs" AutoEventWireup="false" Inherits="imageProcess.imageProcess"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > imageProcess </ title >
         < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >
         < meta  name ="CODE_LANGUAGE"  Content ="C#" >
         < meta  name ="vs_defaultClientScript"  content ="JavaScript" >
         < meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < FONT  face ="宋体" >< INPUT  style ="Z-INDEX: 101; LEFT: 48px; POSITION: absolute; TOP: 32px"  type ="file"  name ="File1"
                    id ="File1"  runat ="server" >
                 < asp:TextBox  id ="txtDescript"  style ="Z-INDEX: 102; LEFT: 48px; POSITION: absolute; TOP: 72px"
                    runat ="server"  TextMode ="MultiLine"  Width ="224px"  Height ="64px" ></ asp:TextBox >
                 < asp:Button  id ="btnUpload"  style ="Z-INDEX: 103; LEFT: 216px; POSITION: absolute; TOP: 152px"
                    runat ="server"  Text ="上传"  Width ="56px" ></ asp:Button ></ FONT >
             < asp:DataGrid  ID ="DG_Persons"  AutoGenerateColumns ="False"  Width ="632px"  HeaderStyle-BackColor ="#ff0000"
                HeaderStyle-Font-Bold ="True"  HeaderStyle-ForeColor ="#ffffff"  ItemStyle-BackColor ="Beige"  BorderColor ="Black"
                Runat ="server"  HeaderStyle-HorizontalAlign ="Center"  style ="Z-INDEX: 105; LEFT: 48px; POSITION: absolute; TOP: 208px" >
                 < ItemStyle  BackColor ="Beige" ></ ItemStyle >
                 < HeaderStyle  Font-Bold ="True"  HorizontalAlign ="Center"  ForeColor ="White"  BackColor ="Red" ></ HeaderStyle >
                 < Columns >
                     < asp:TemplateColumn  HeaderText ="图片编号" >
                         < ItemTemplate >
                             < asp:Label  id =Label1  Text ='<%#  DataBinder.Eval(Container.DataItem, "ImgID") % > ' Runat="server">
                             </ asp:Label >
                         </ ItemTemplate >
                     </ asp:TemplateColumn >
                     < asp:TemplateColumn  HeaderText ="图片类型" >
                         < ItemTemplate >
                             < asp:Label  Runat ="server"  Text ='<%#  DataBinder.Eval(Container.DataItem, "ImageContentType") % > ' ID="Label2"/>
                         </ ItemTemplate >
                     </ asp:TemplateColumn >
                     < asp:TemplateColumn  HeaderText ="图片大小" >
                         < ItemTemplate >
                             < asp:Label  Runat ="server"  Text ='<%#  DataBinder.Eval(Container.DataItem, "ImageSize") % > ' ID="Label3"/>
                         </ ItemTemplate >
                     </ asp:TemplateColumn >
                     < asp:TemplateColumn  HeaderText ="照片" >
                         < ItemTemplate >
                             < asp:Image  Runat =server  ID ="Image2"  ImageUrl ='<%#  FormatURL(DataBinder.Eval(Container.DataItem, "ImgID")) % > ' />
                         </ ItemTemplate >
                     </ asp:TemplateColumn >
                 </ Columns >
             </ asp:DataGrid >
         </ form >
     </ body >
</ HTML >

2.相应的后台代码processImage.aspx.cs代码如下：

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

namespace  imageProcess
{
    /**//// <summary>
    /// imageProcess 的摘要说明。
    /// </summary>
    public class imageProcess : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.TextBox txtDescript;
        protected System.Web.UI.HtmlControls.HtmlInputFile File1;
        protected System.Web.UI.WebControls.DataGrid DG_Persons;
        protected System.Web.UI.WebControls.Button btnUpload;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            dataGridBind();
            
        }
        private void dataGridBind()
        {
            SqlConnection con=new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
            con.Open();
            SqlCommand cmd=new SqlCommand("select ImgID,ImageContentType,ImageSize,ImageData from ImageStore",con);
            this.DG_Persons.DataSource=cmd.ExecuteReader();
            this.DG_Persons.DataBind();
            con.Close();
        }
        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        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.btnUpload.Click += new System.EventHandler(this.btnUpload_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void btnUpload_Click(object sender, System.EventArgs e)
        {
            SqlConnection con=new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
            con.Open();
            FileStream fs=File.Open(this.File1.PostedFile.FileName,FileMode.Open);
            byte[] by=new byte[fs.Length];
            fs.Read(by,0,(int)fs.Length);
            String SqlCmd = "insert into ImageStore(ImageData,ImageContentType,ImageDescription,ImageSize) values(@Image,@fileType,@fileDec,@fileSize)";
            SqlCommand CmdObj = new SqlCommand(SqlCmd, con);
            CmdObj.Parameters.Add("@Image",SqlDbType.Image, (int)fs.Length).Value = by;
            CmdObj.Parameters.Add("@fileType",SqlDbType.VarChar,20).Value=this.File1.PostedFile.ContentType;
            CmdObj.Parameters.Add("@fileDec",SqlDbType.VarChar,200).Value=this.txtDescript.Text;
            CmdObj.Parameters.Add("@fileSize",SqlDbType.BigInt).Value=this.File1.PostedFile.ContentLength;
            fs.Close();
            CmdObj.ExecuteNonQuery();
            dataGridBind();
        }
        protected string FormatURL(object strArgument)
        {
            return "ReadImage.aspx?id=" + strArgument.ToString();
        }

    }
}

3.从数据库中读取图片
   新建一个readImage.aspx窗体文件，输入C#代码（readImage.aspx.cs）如下：

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

namespace  imageProcess
{
    /**//// <summary>
    /// ReadImage 的摘要说明。
    /// </summary>
    public class ReadImage : System.Web.UI.Page
    {
        private void Page_Load(object sender, System.EventArgs e)
        {
            string strImageID = Request.QueryString["id"];
            SqlConnection myConnection = new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
            SqlCommand myCommand = new SqlCommand("Select ImageContentType, ImageData from ImageStore Where ImgID=" 
                + strImageID, myConnection);

            try
            {
                myConnection.Open();
                SqlDataReader myDataReader;
                myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
                if(myDataReader.Read())
                {
                    Response.Clear();
                    Response.ContentType = myDataReader["ImageContentType"].ToString();
                    Response.BinaryWrite((byte[])myDataReader["ImageData"]);
                }
                myConnection.Close();
            }
            catch (SqlException SQLexc)
            {
                Response.Write("提取数据时出现错误：" + SQLexc.ToString());
            }
            Response.End();

        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        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
    }
}

以上代码部分是应用自网络，与大家共同分享，谢谢！