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在ASP.NET中实现多文件上传
 
作者:不详   来源:网络   编辑:阿志
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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> <script language="JavaScript"> function addFile() { var str = '<INPUT type="file" size="50" NAME="File">' document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str) } </script> </HEAD> <body> <form id="form1" method="post" runat="server" enctype="multipart/form-data"> <center> <asp:Label Runat="server" ID="MyTitle"></asp:Label> <P id="MyFile"><INPUT type="file" size="50" NAME="File"></P> <P> <input type="button" value="增加(Add)" onclick="addFile()"> <asp:Button Runat="server" Text="上传" ID="Upload"></asp:Button> <input onclick="this.form.reset()" type="button" value="重置(ReSet)"> </P> </center> <P align="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 #Region " Web Form Designer Generated Code " 'This call is required by the Web Form Designer. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: This method call is required by the Web Form Designer 'Do not modify it using the code editor. InitializeComponent() End Sub #End Region 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 Next strStatus.Text = strMsg.ToString() Return True Catch Ex As System.Exception strStatus.Text = Ex.Message Return False End Try End Function End Class

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