用C#实现图片数据库存储与显示
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在网络上查找了一些资料，对C#实现图片的数据库存储与显示作个总结！所有代码都可以直接复制运行。准备数据库，在SQL2000数据库的pubs数据库中建立一个ImageStore数据表，字段有ImgID,ImageData,ImageContentType,ImageDescription,ImageSize五个字段。
Lets go......
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 cnotallow=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 cnotallow=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！
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