上传文件有两个主要的目的地,一个是服务器,另一个是数据库,ASP.NET内置了FileUpload这个上传控件,文本框显示用户选择的文件的全名.
其属性主要包括:
ContenLength:上传文件大小,单位:字节
FileName:文件名称
HasFile:是否选择了文件
例子: 测试环境.net 2.0(内有详细说明)
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 /> </div> </form> </body> </html>
default.aspx.cs
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;
public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void btnUpload_Click(object sender, EventArgs e) { Boolean fileOk = false; string path = Server.MapPath("~/upload/"); //判断是否已经选取文件 if (FileUpload1.HasFile) { //取得文件的扩展名,并转换成小写 string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower(); //限定只能上传jpg和gif图片 string[] allowExtension = { ".jpg", ".gif" }; //对上传的文件的类型进行一个个匹对 for (int i = 0; i < allowExtension.Length; i++) { if (fileExtension == allowExtension[i]) { fileOk = true; break; } } //对上传文件的大小进行检测,限定文件最大不超过1M if (FileUpload1.PostedFile.ContentLength > 1024000) { fileOk = false; } //最后的结果 if (fileOk) { try { FileUpload1.SaveAs(path + System.DateTime.Now.ToString("yyyyMMddhhmmss"+FU.FileName); Image.ImageUrl = "../Upload/" + System.DateTime.Now.ToString("yyyyMMddhhmmss") + FU.FileName; Response.Write("<script type=‘text/javascript‘>window.alert(‘上传成功‘)</script>"); } catch { Response.Write("<script type=‘text/javascript‘>window.alert(‘上传失败‘)</script>"); } } else { Response.Write("<script type=‘text/javascript‘>window.alert(‘文件类型或者文件大小超出1M‘)</script>"); }
} } }
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