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使用ASP.NET上传多个文件到数据库

2009-03-20 06:45 363 查看

如果仅仅是上传一个文件,最好是使用FileUpload控件, 可以使用FileUpload1.FileContent.Length得到文件大小, FileUpload1.FileBytes得到其字节数组, 代码略.

如果要上传多个文件, 其客户端代码与使用ASP.NET上传多个文件到服务器基本相同, 本例中加入了下载的示例代码。

效果图如下:

数据库脚本

create database FileDB
go
use FileDB
go
create table dbo.Files
(
	id int identity primary key
	,FileName varchar(50) not null
	,FileSize int not null
	,FileData image not null
	--,UpTime DateTime default getdate()
	--,DownLoadTimes int default 0
)
go

页面代码:MutlileFileUploadToDB.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MutlileFileUploadToDB.aspx.cs" Inherits="MutlileFileUploadToDB" %>

<!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>
    <title>多文件上传到数据库Demo</title>
    <link href="css/writemail.css" mce_href="css/writemail.css" rel="stylesheet" type="text/css" />
    <mce:script type="text/javascript"><!--
        var MAXFILES = 5;
        //文件计数器
        var fileCount = 0;
        function addAttach(noAlert) {
            if (fileCount >= MAXFILES && !noAlert) {
                alert("最多只能添加" + MAXFILES + "个附件！");
                return;
            }

            var fileSectionDiv = document.getElementById("files");
            var fileItemDiv = document.createElement("div");
            fileCount++;

            var content = "<input type='file' onchange='return addAttach(true);' name='fileUpload'" + fileCount + "> <a href="#" mce_href="#" onclick='return delAttach(/"" + fileCount + "/")' class='delete_attach' >移除附件</a>";

            fileItemDiv.id = "fileItemDiv" + fileCount;
            fileItemDiv.innerHTML = content;
            fileSectionDiv.appendChild(fileItemDiv);

            return false;
        }

        function delAttach(fileIndex) {
            var fileSectionDiv = document.getElementById("files");
            var fileItemDiv = document.getElementById("fileItemDiv" + fileIndex);
            fileSectionDiv.removeChild(fileItemDiv);
            return false;
        }
    
// --></mce:script>
</head>
<body>
    <form id="form1" runat="server" >
    <div>
        <a id="addAttach_a" onclick="return addAttach(false);" href="#" mce_href="#" class="add_attach">添加附件</a> 
        <div id="files"></div>
        <asp:Button ID="btnSend" runat="server" Text="发送" onclick="btnSend_Click" />
        <asp:GridView ID="gvwFiles" runat="server" AutoGenerateColumns="False" 
            DataKeyNames="id" DataSourceID="sdsFiles" 
            onrowcommand="gvwFiles_RowCommand">
            <Columns>
                <asp:BoundField DataField="FileName" HeaderText="FileName" 
                    SortExpression="FileName" />
                <asp:BoundField DataField="FileSize" HeaderText="FileSize" 
                    SortExpression="FileSize" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="lbtnDownload" runat="server" CommandName="download" CommandArgument='<%#Eval("FileName") %>'>下载</asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

        <asp:SqlDataSource ID="sdsFiles" runat="server" 
            ConnectionString="<%$ ConnectionStrings:FileDBConnectionString %>" 
            DataSourceMode="DataReader" 
            ProviderName="<%$ ConnectionStrings:FileDBConnectionString.ProviderName %>" 
            SelectCommand="SELECT [id], [FileName], [FileSize] FROM [Files]">
        </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

后台代码:MutlileFileUploadToDB.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data.SqlClient;

public partial class MutlileFileUploadToDB : System.Web.UI.Page
{
    protected void Page_Load(object sender, System.EventArgs e)
    {
        //告诉表单如何格式化文件信息
        Page.Form.Enctype = "multipart/form-data";
    }

    protected void btnSend_Click(object sender, EventArgs e)
    {
        for (int index = 0; index < Request.Files.Count; index++)
        {
            HttpPostedFile file = Request.Files[index];
            if (!string.IsNullOrEmpty(file.FileName))
            {
                byte[] fileBytes = new byte[file.ContentLength];
                file.InputStream.Read(fileBytes, 0, file.ContentLength);
                using (SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["FileDBConnectionString"].ConnectionString))
                {
                    SqlCommand cmd = new SqlCommand("insert into Files(FileName, FileSize, FileData) values(@fileName, @fileSize, @fileData)", cn);
                    cmd.Parameters.AddWithValue("@fileName", Path.GetFileName(file.FileName));
                    cmd.Parameters.AddWithValue("@fileSize", file.ContentLength);
                    cmd.Parameters.AddWithValue("@FileData", fileBytes);
                    cn.Open();
                    cmd.ExecuteNonQuery();
                }
            }
        }
        gvwFiles.DataBind();
    }

    protected void gvwFiles_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "download")
        {
            byte[] fileData = null;
            using (SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["FileDBConnectionString"].ConnectionString))
            {
                SqlCommand cmd = new SqlCommand("select FileData from files where id = @id", cn);
                int index = ((e.CommandSource as LinkButton).NamingContainer as GridViewRow).RowIndex;
                cmd.Parameters.AddWithValue("@id", gvwFiles.DataKeys[index].Value);

                cn.Open();
                fileData = cmd.ExecuteScalar() as byte[];
            }

            if (fileData == null)
            {
                Response.StatusCode = 404;
            }
            else
            {
                //使用Content-Disposition会有些缺点，在不同的浏览器中文件名显示有些不正常，如果用FireFox就无须编码
                Response.AddHeader("Content-Disposition", "attachment; filename=/"" + HttpUtility.UrlEncode(e.CommandArgument.ToString(), System.Text.Encoding.UTF8) + "/"");
                Response.BinaryWrite(fileData);
            }

            Response.End();
        }
    }
}

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