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。
Let's 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>

</HEAD>

<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">

<asp:TemplateColumn HeaderText="图片编号">

<asp:Label id=Label1 Text='<%# DataBinder.Eval(Container.DataItem, "ImgID") %>' Runat="server">

</asp:Label>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="图片类型">

<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ImageContentType") %>' ID="Label2"/>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="图片大小">

<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ImageSize") %>' ID="Label3"/>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="照片">

<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

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();

}

#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！