第一种（务器控件）：
1.Default.aspx代码如下：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>文件上传</title>
</head>
<body>
<form id="form1" action="Default2.aspx" enctype="multipart/form-data" method="post">
<div>
<input name="oneFile" type="file"/>
<input name="btton" type="submit" value="上传" />
</div>
</form>
</body>
</html>
2.Default.aspx.cs代码如下：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
HttpFileCollection files = HttpContext.Current.Request.Files;
HttpPostedFile file = files["oneFile"];
string FileName = System.IO.Path.GetFileName(file.FileName);
string serverpath = "D:/Admin/Image/" + DateTime.Now.ToString("yyMMddhhmmss") + FileName;
string strExping = FileName.Substring(FileName.LastIndexOf("."));
if (strExping.Equals(".jpg"))
{
file.SaveAs(serverpath);
Response.Write("成功");
}
else
{
Response.Write("失败");
}
}
}
}
第二种(非服务器控件)：
1.Default.aspx代码如下：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>未命名頁面</title>
</head>
<body>
<form id="form1" action="Default2.aspx" enctype="multipart/form-data" method="post">
<div>
<input name="oneFile" type="file"/>
<input name="btton" type="submit" value="上传" />
</div>
</form>
</body>
</html>
2.Default.aspx.cs代码如下：
public void FileUpload()
{
HttpFileCollection files = HttpContext.Current.Request.Files;
HttpPostedFile postedFile = files["oneFile"];
if (postedFile.ContentLength > 3072000)
Response.Write("文件大小不能大于300K！");
string fileName, fileExtension;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
string SaveFilePath = "";
if (fileName != "")
{
//SaveFilePath = "/UploadFile/" + System.DateTime.Now.ToString("yyyymmddhhmmss") + ".rar";
SaveFilePath = System.DateTime.Now.ToString("yyyymmddhhmmss") + ".rar";
fileExtension = System.IO.Path.GetExtension(fileName).ToLower();
if (fileExtension != ".rar")
Response.Write("文件格式不正确，你只能上传WinRar压缩包格式文件！");
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("UploadFile/") + SaveFilePath);
//postedFile.SaveAs(Server.MapPath(SaveFilePath));
}
}
第三种（服务器控件）：
（Default.aspx代码如下：跟第一种第二种的都差不多，就不写了）
1.Default.aspx.cs代码如下：
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
FileUpload1.SaveAs (Server.MapPath ( "~/Upload/" +FileUpload1.FileName));
Label1.Text="恭喜你，上传成功!";
}
else
{
Label1.Text = "上传失败，或没指定正确的文件!";
}
}
第四种（服务器控件控制上传文件大小,类型 ）：
1、Default.aspx代码如下：
<%@ 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 id="Head1" runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" Width="325px" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" Width="44px" /><br />
上传文件名：<asp:Label ID="Label2" runat="server"></asp:Label><br />
上传文件大小：<asp:Label ID="Label3" runat="server"></asp:Label><br />
上传文件路径及名：<asp:Label ID="Label4" runat="server"></asp:Label><br />
<asp:Label ID="Label1" runat="server" ForeColor="Red"></asp:Label><br />
</div>
</form>
</body>
</html>
2、Default.aspx.cs代码如下：
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)
{
if (FileUpload1.HasFile)
{
Label2.Text = FileUpload1.FileName;
Label3.Text = FileUpload1.PostedFile.ContentLength.ToString() + "字节";
Label4.Text = FileUpload1.PostedFile.FileName;
//获得扩展名
string extension = System.IO.Path.GetExtension(FileUpload1.FileName);
if (extension == ".rar" || extension == ".doc" || extension == ".xls")
{
if (FileUpload1.PostedFile.ContentLength < 10000000)//文件小于10M
{
FileUpload1.SaveAs(Server.MapPath("~/upLoad/" + FileUpload1.FileName));
Label1.Text = "恭喜你，上传成功!";
}
else
{
Label1.Text = "上传失败，不是管理员，上传文件不能大于10M！";
}
}
else
Label1.Text = "上传失败，只能上传扩展名是rar、doc、xls的文件！";
}
else
{
Label1.Text = "上传失败，或没指定正确的文件!";
}
}
}