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关于把图片存入ACCESS形成二进制文件进行图片绑定显示(c#版)

2007-12-18 11:20 716 查看

注意：本演示需要创建两个aspx文件
一个为default2.aspx 一个为default3.aspx
一个数据库文件表名为photo ID：自动增长类型 Image:ole类型;ImageType:文本类型
(本演示代码为网上复制粘贴，本人只是进行了详细说明和组织)
-----------------------------------------------------------
dafault2.aspx 代码如下
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>

<asp:TemplateField>
<ItemTemplate>
<img src="<%#FormatURL(Eval("ID")) %>" /></ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<br />
选择照片：<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="上传" OnClick="Button1_Click"></asp:Button>
<p>
<asp:Label ID="Msg" runat="server" ForeColor="Red"></asp:Label></p>
</form>
</body>
</html>
---------------------------------------------------------------------------
default2.aspx 中cs代码如下
using System.Data.OleDb;

protected void Button1_Click(object sender, EventArgs e)
{
System.IO.Stream fileDataStream = FileUpload1.PostedFile.InputStream;

if (fileDataStream.Length < 1)
{
Msg.Text = "请选择文件。";
return;
}

//得到文件大小
int fileLength = FileUpload1.PostedFile.ContentLength;

//创建数组
byte[] fileData = new byte[fileLength];
//把文件流填充到数组
fileDataStream.Read(fileData, 0, fileLength);
//得到文件类型
string fileType = FileUpload1.PostedFile.ContentType;

//构建数据库连接，SQL语句，创建参数
string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("sc.mdb");
OleDbConnection myConnection = new OleDbConnection(strCnn);
OleDbCommand command = new OleDbCommand("INSERT INTO photo(ImageType,[Image])" +
"VALUES (@ImageType,@Image)", myConnection);
//注意Image是关键字必须用[]引起
command.Parameters.AddWithValue("@ImageType", fileType);
command.Parameters.AddWithValue("@Image", fileData);

//打开连接，执行查询
myConnection.Open();
command.ExecuteNonQuery();
myConnection.Close();
Response.Redirect(Request.RawUrl);
}

protected void Page_Load(object sender, EventArgs e)
{

if (!Page.IsPostBack)
{
BindGrid();
}
}

private void BindGrid()
{
string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
+ Server.MapPath("sc.mdb");
OleDbConnection myConnection = new OleDbConnection(strCnn);
OleDbCommand myCommand = new OleDbCommand("SELECT * FROM photo", myConnection);

try
{
myConnection.Open();
GridView1.DataSource = myCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

GridView1.DataBind();
}
catch (OleDbException SQLexc)
{
Response.Write("提取数据时出现错误：" + SQLexc.ToString());
}
}
protected string FormatURL(object strArgument)
{
return "Default3.aspx?id=" + strArgument.ToString();
}

------------------------------------------------------------------------------
default3.aspx (cs代码如下)
using System.Data.OleDb;
protected void Page_Load(object sender, EventArgs e)
{

string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("sc.mdb");
OleDbConnection myConnection = new OleDbConnection(strCnn);
OleDbCommand command = new OleDbCommand("select * from photo Where ID =" + Request.QueryString["id"], myConnection);
myConnection.Open();
OleDbDataReader dr = command.ExecuteReader();
if (dr.Read())
{
Response.Clear();
Response.AddHeader("Content-Type", dr["ImageType"].ToString());
Response.BinaryWrite((byte[])dr["Image"]);
}
dr.Close();
myConnection.Dispose();
}

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