在網絡上查找了一些資料，對C#實現圖片的數據庫存儲與顯示作個總結！所有代碼都可以直接復制運行。准備數據庫，在SQL2000數據庫的pubs數據庫中建立一個ImageStore數據表，字段有ImgID,ImageData,ImageContentType,ImageDescription,ImageSize五個字段。
Let's go......
1.圖片文件的存儲，代碼如下：(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="宋體"><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="上傳" 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="圖片編號">
<ItemTemplate>
<asp:Label id=Label1 Text='<%# DataBinder.Eval(Container.DataItem, "ImgID") %>' Runat="server">
</asp:Label>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="圖片類型">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ImageContentType") %>' ID="Label2"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="圖片大小">
<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.相應的後台代碼processImage.aspx.cs代碼如下：
using System;3.從數據庫中讀取圖片
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 的摘要說明。
/// </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)
{
// 在此處放置用戶代碼以初始化頁面
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 窗體設計器生成的代碼#region Web 窗體設計器生成的代碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </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();
}
}
}
新建一個readImage.aspx窗體文件，輸入C#代碼（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 的摘要說明。
/// </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("提取數據時出現錯誤：" + SQLexc.ToString());
}
Response.End();
}
Web 窗體設計器生成的代碼#region Web 窗體設計器生成的代碼
override protected void OnInit(EventArgs e)以上代碼部分是應用自網絡，與大家共同分享，謝謝！
{
//
// CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
