asp.net上传文件

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//运行环境Microsoft Visual Studio 2005

//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">

</head>

<body>

<div>

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

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />

文件路径:<asp:Label ID="Label1" runat="server" Height="21px" Width="709px"></asp:Label><br />

<asp:Label ID="Label2" runat="server" Width="136px"></asp:Label> <br />

<asp:Image ID="Image1" runat="server" Height="136px" Width="230px" />

   <br />

</div>

</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)

{

Image1.Visible = false;

}

protected void Button1_Click(object sender, EventArgs e)

{

if (FileUpload1.PostedFile.FileName!=null)

{

//文件路径

string name1 = FileUpload1.PostedFile.FileName;

// Image1.ImageUrl=name1;

//文件名称

string name2 = System.IO.Path.GetFileName(name1);

//文件大小

int filelongth = FileUpload1.PostedFile.ContentLength;

int tt = name1.LastIndexOf(".");

//文件后缀

string filetype = name1.Substring(tt);

//文件后缀转换成小写字母

filetype= filetype.ToLower();

//检查文件的格式

if (filetype != ".gif" && filetype != ".jpg" && filetype != ".jpeg" && filetype != ".bmp" && filetype != ".png")

{

Response.Write("文件格式不正确!");

Response.End();

}

else

{

try

{

FileUpload1.SaveAs(Server.MapPath("picture") + "/" + FileUpload1.FileName);

Image1.ImageUrl = Server.MapPath("picture") + "/" + FileUpload1.FileName;

Image1.Visible = true;

Label1.Text = name1;

Label2.Text = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);

}

catch (Exception ex)

{

}

else

{ Label1.Text = "You have not specified a file."; }

}