在ASP.NET中实现多文件上传

来源：互联网发布：下载建筑图纸软件编辑：程序博客网时间：2024/06/02 04:47

在以前的Web应用中，上传文件是个很麻烦的事，现在有了.NET，文件上传变得轻而易举。下面的这个例子实现了多文件上传功能。可以动态添加输入表单，上传的文件数量没有限制。代码如下：

MultiUpload.aspx

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="MultiUpload.aspx.vb"

Inherits="aspxWeb.MultiUpload" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>多文件上传</title>

function addFile()

{

var str = '<INPUT type="file" size="50" NAME="File">'

document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)

}

</script>

</HEAD>

<body>

<asp:Label Runat="server" ID="MyTitle"></asp:Label>

<P>

<asp:Button Runat="server" Text="上传" ID="Upload"></asp:Button>

</P>

</center>

<asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True"

Font-Size="9pt" Width="500px" BorderStyle="None" BorderColor="White"></asp:Label>

</P>

</form>

</body>

</HTML>

后代码：MultiUpload.aspx.vb

Public Class MultiUpload

Inherits System.Web.UI.Page

Protected WithEvents Upload As System.Web.UI.WebControls.Button

Protected WithEvents MyTitle As System.Web.UI.WebControls.Label

Protected WithEvents strStatus As System.Web.UI.WebControls.Label

Web Form Designer Generated Code

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

MyTitle.Text = "<h3>多文件上传</h3>"

Upload.Text = "开始上传"

If (Me.IsPostBack) Then Me.SaveImages()

End Sub

Private Function SaveImages() As System.Boolean

'遍历File表单元素

Dim files As System.Web.HttpFileCollection = System.Web.HttpContext.Current.Request.Files

'状态信息

Dim strMsg As New System.Text.StringBuilder("上传的文件分别是：<hr color=red>")

Dim iFile As System.Int32

Try

For iFile = 0 To files.Count - 1

'检查文件扩展名字

Dim postedFile As System.Web.HttpPostedFile = files(iFile)

Dim fileName, fileExtension As System.String

fileName = System.IO.Path.GetFileName(postedFile.FileName)

If Not (fileName = String.Empty) Then

fileExtension = System.IO.Path.GetExtension(fileName)

strMsg.Append("上传的文件类型：" + postedFile.ContentType.ToString() + "<br>")

strMsg.Append("客户端文件地址：" + postedFile.FileName + "<br>")

strMsg.Append("上传文件的文件名：" + fileName + "<br>")

strMsg.Append("上传文件的扩展名：" + fileExtension + "<br><hr>")

'可根据扩展名字的不同保存到不同的文件夹

postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName)

End If

strStatus.Text = strMsg.ToString()

Return True

Catch Ex As System.Exception

strStatus.Text = Ex.Message

Return False

End Try

End Function

End Class

C# 版本

UpLoad.aspx

<%@ Page language="c#" Codebehind="UpLoad.aspx.cs" AutoEventWireup="false" Inherits="WebPortal.Upload" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>多文件上传</title>

function addFile()

{

var str = '<INPUT type="file" size="50" NAME="File">'

document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)

}

</script>

</HEAD>

<body>

<h3>多文件上传</h3>

<P>

<asp:Button Runat="server" Text="开始上传" ID="UploadButton"></asp:Button>

</P>

<P>

<asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt"

Width="500px" BorderStyle="None" BorderColor="White"></asp:Label>

</P>

</div>

</form>

</body>

</HTML>

UpLoad.aspx.cs

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace WebPortal

{

/// <summary>

/// UpLoad 的摘要说明。

/// 实现多文件上传

/// </summary>

public class Upload : System.Web.UI.Page

{

protected System.Web.UI.WebControls.Button UploadButton;

protected System.Web.UI.WebControls.Label strStatus;

private void Page_Load(object sender, System.EventArgs e)

{

/// 在此处放置用户代码以初始化页面

if (this.IsPostBack) this.SaveImages();

}

private Boolean SaveImages()

{

///'遍历File表单元素

HttpFileCollection files = HttpContext.Current.Request.Files;

/// '状态信息

System.Text.StringBuilder strMsg = new System.Text.StringBuilder();

strMsg.Append("上传的文件分别是：<hr color=red>");

try

{

for(int iFile = 0; iFile < files.Count; iFile++)

{

///'检查文件扩展名字

HttpPostedFile postedFile = files[iFile];

string fileName, fileExtension;

fileName = System.IO.Path.GetFileName(postedFile.FileName);

if (fileName != "")

{

fileExtension = System.IO.Path.GetExtension(fileName);

strMsg.Append("上传的文件类型：" + postedFile.ContentType.ToString() + "<br>");

strMsg.Append("客户端文件地址：" + postedFile.FileName + "<br>");

strMsg.Append("上传文件的文件名：" + fileName + "<br>");

strMsg.Append("上传文件的扩展名：" + fileExtension + "<br><hr>");

///'可根据扩展名字的不同保存到不同的文件夹

///注意：可能要修改你的文件夹的匿名写入权限。

postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName);

}

strStatus.Text = strMsg.ToString();

return true;

}

catch(System.Exception Ex)

{

strStatus.Text = Ex.Message;

return false;

}

Web 窗体设计器生成的代码

}