上傳文件有兩個主要的目的地,一個是服務器，另一個是數據庫,ASP.NET內置了FileUpload這個上傳控件,文本框顯示用戶選擇的文件的全名.
其屬性主要包括:
ContenLength:上傳文件大小,單位:字節
FileName:文件名稱
HasFile:是否選擇了文件
例子:
測試環境.net 2.0(內有詳細說明)
default.aspx
<!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>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" /><br />
<br />
<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click" Text="上傳" /> </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/");
//判斷是否已經選取文件
if (FileUpload1.HasFile)
{
//取得文件的擴展名,並轉換成小寫
string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
//限定只能上傳jpg和gif圖片
string[] allowExtension = { ".jpg", ".gif", ".txt", ".xls" };
//對上傳的文件的類型進行一個個匹對
for (int i = 0; i < allowExtension.Length; i++)
{
if (fileExtension == allowExtension[i])
{
fileOk = true;
break;
}
}
//
if (fileOk)
{
resultlbl.Text = "要上傳的文件類型不對！";
}
//對上傳文件的大小進行檢測，限定文件最大不超過1M
if (FileUpload1.PostedFile.ContentLength > 1024000)
{
fileOk = false;
}
//最後的結果
if (fileOk)
{
try
{
FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
resultlbl.Text ="上傳成功";
}
catch
{
resultlbl.Text = "上傳失敗";
}
}
else
{
resultlbl.Text = "文件類型或者文件大小超出１Ｍ或者文件類型不對";
}
}
}
}