ASP.NET文件上传
例子一:
用一个正则表达式来验证上传文件的类型,去掉<asp:RegularExpressionValidator/> 能上传所有
Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="必须是 jpg或者gif文件" ValidationExpression="^(([a-zA-Z]:)|(\\{2}\W+)\$?)(\\(\W[\W].*))+(.jpg|.Jpg|.gif|.Gif)$"></asp:RegularExpressionValidator>
</form>
</body>
</html>
Default.aspx.cs:
using System;
using System.Data;
using System.Configuration;
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;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
String savePath = @"F:\Upload\";
if (FileUpload1.HasFile)
{
String filename;
filename = FileUpload1.FileName;
savePath +=filename;
FileUpload1.SaveAs(savePath);
Page.Response.Write(FileUpload1.PostedFile.ContentType + FileUpload1.PostedFile.ContentLength+"<br>");
Page.Response.Write("<img src='"+savePath+"'>");
}
else
{
Page.Response.Write("fff");
}
}
}
例子二:
获得上传的文件各属性,并验证
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
fileExt = System.IO.Path.GetExtension(FileUpload1.FileName);
if (fileExt == ".rar" || fileExt == ".zip")
{
try
{
FileUpload1.SaveAs(Server.MapPath("upload") + "\\" + FileUpload1.FileName);
Label1.Text = "客户端路径：" + FileUpload1.PostedFile.FileName + "〈br>" +
"文件名：" + System.IO.Path.GetFileName(FileUpload1.FileName) + "〈br>" +
"文件扩展名：" + System.IO.Path.GetExtension(FileUpload1.FileName) + "〈br>" +
"文件大小：" + FileUpload1.PostedFile.ContentLength + " KB〈br>" +
"文件MIME类型：" + FileUpload1.PostedFile.ContentType + "〈br>" +
"保存路径：" + Server.MapPath("upload") + "\\" + FileUpload1.FileName;
}
catch (Exception ex)
{
Label1.Text = "发生错误：" + ex.Message.ToString();
}
}
else
{
Label1.Text = "只允许上传rar、zip文件！";
}
}
else
{
Label1.Text = "没有选择要上传的文件！";
}
}
例子三:
一次上传多个文件,使用HttpFileCollection类捕获从Request对象发送来的所有文件，然后再单独对每个文件进行处理
protected void Button1_Click(object sender, EventArgs e)
{
string filepath = Server.MapPath("upload") + "\\";
HttpFileCollection uploadFiles = Request.Files;
for (int i = 0; i 〈 uploadFiles.Count; i++)
{
HttpPostedFile postedFile = uploadFiles[i];
try
{
if (postedFile.ContentLength > 0)
{
Label1.Text += "文件 #" + (i + 1) + "：" + System.IO.Path.GetFileName(postedFile.FileName) + "〈br/>";
postedFile.SaveAs(filepath + System.IO.Path.GetFileName(postedFile.FileName));
}
}
catch (Exception Ex)
{
Label1.Text += "发生错误： " + Ex.Message;
}
}
}
例子四:解决上传文件大小限制
在ASP.NET 2.0中FileUpload默认上传文件最大为4M，不过我们可以在web.cofig中修改相关节点来更改这个默认值
程序代码
〈system.web>
〈httpRuntime maxRequestLength="40690" executionTimeout="6000" />
〈/system.web>
maxRequestLength表示可上传文件的最大值，executionTimeout表示ASP.NET关闭前允许发生的上载秒数。
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