ASP.NET實例教程之文件上傳

2024-07-10 13:27:49

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本文是ASP.NET實例教程中關于文件上傳FileUpload，希望本教程能給大家一些啟發，同時對FileUpload也有更深刻的理解。

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>無標題頁</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="必須是 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:/111/";
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");
}
}
}

去掉綠色部分就可上傳任何文件,它是用一個正則表達式來驗證上傳文件的類型

例子二：

在ASP.NET 2.0中使用FileUpload服務器控件很容易的就能將文件上傳到服務器，一個簡單的例子如下：

aspx：

程序代碼

〈%@ Page Language="C#" AutoEventWireup="true" CodeFile="fileupload.aspx.cs" Inherits="fileupload" %>
〈!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>FileUpload上傳文件示例-Mzwu.com〈/title>
〈/head>
〈body>
〈form id="form1" runat="server">
〈div>
〈asp:FileUpload ID="FileUpload1" runat="server" />
〈asp:Button ID="Button1" runat="server" _disibledevent="Button1_Click" Text="上傳文件" />〈br />
〈asp:Label ID="Label1" runat="server" Height="269px" Text="Label" Width="360px">〈/asp:Label>〈/div>
〈/form>
〈/body>
〈/html>

aspx.cs：

程序代碼

protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
try
{
FileUpload1.SaveAs(Server.MapPath("upload") + "//" + FileUpload1.FileName);
Label1.Text = "客戶端路徑：" + FileUpload1.PostedFile.FileName + "〈br>" +
"文件名：" + System.IO.Path.GetFileName(FileUpload1.FileName) + "〈br>" +
"文件擴展名：" + System.IO.Path.GetExtension(FileUpload1.FileName) + "〈br>" +
"文件大?。?quot; + FileUpload1.PostedFile.ContentLength + " KB〈br>" +
"文件MIME類型：" + FileUpload1.PostedFile.ContentType + "〈br>" +
"保存路徑：" + Server.MapPath("upload") + "//" + FileUpload1.FileName;
}
catch (Exception ex)
{
Label1.Text = "發生錯誤：" + ex.Message.ToString();
}
}
else
{
Label1.Text = "沒有選擇要上傳的文件！";
}
}

ASP.NET實例教程1.一次上傳多個文件

要一次上傳多個文件，我們可以像傳單個文件那樣對每個文件單獨進行處理，除此之外，我們還可以使用HttpFileCollection類捕獲從Request對象發送來的所有文件，然后再單獨對每個文件進行處理，代碼如下：

aspx.cs：

程序代碼

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 += "發生錯誤： " + Ex.Message;
}
}
}