判断文件能否上传函数调用

显示页面Html代码：

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="提交" /></div>

</form>

</body>

</html>

显示页面CS代码：

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

public partial class Downloadfile : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

private void DownloadFile(string physicalFilePath)

{

FileStream stream = null;

try

{

stream = new FileStream(physicalFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);

int bufSize = (int)stream.Length;

byte[] buf = new byte[bufSize];

int bytesRead = stream.Read(buf, 0, bufSize);

HttpContext.Current.Response.ContentType = "application/octet-stream";

//attachment是以附件的形式下载，也可以改为online在线找开．

HttpContext.Current.Response.AppendHeader("Content-Disposition", "online;filename=" + HttpUtility.UrlEncode(System.IO.Path.GetFileName(physicalFilePath), System.Text.Encoding.UTF8));

HttpContext.Current.Response.OutputStream.Write(buf, 0, bytesRead);

HttpContext.Current.Response.End();

}

finally

{

stream.Close();

}

protected void Button1_Click(object sender, EventArgs e)

{

if (FileUpload1.HasFile)

{

string fileload = FileUpload1.PostedFile.FileName;

DownloadFile(fileload);

}

else

{

Response.Write("<script>alert('请先上传文件');</script>");

}

posted on 2007-04-17 10:10 小角色阅读(205) 评论(0) 收藏举报