代码很简单，就不罗唆了。
C#：
<%@ Page Language="C#" AutoEventWireup="true" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void btnUpload_Click( object sender, EventArgs e ) { if (FileUpload1.PostedFile.InputStream.Length < 1) { Msg.Text = "请选择文件。"; return; } string FileName = FileUpload1.FileName; if (FileName.ToLower().IndexOf(".txt") == -1) { Msg.Text = "请选择文本文件。"; return; } int FileLen = FileUpload1.PostedFile.ContentLength; byte[] input = new byte[FileLen]; System.IO.Stream UpLoadStream = FileUpload1.PostedFile.InputStream; UpLoadStream.Read(input, 0, FileLen); UpLoadStream.Position = 0; System.IO.StreamReader sr = new System.IO.StreamReader(UpLoadStream, System.Text.Encoding.Default); Msg.Text = "您上传的文件内容是：<br/><br/>" + sr.ReadToEnd(); sr.Close(); UpLoadStream.Close(); UpLoadStream = null; sr = null; } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>不经保存，直接读取上传文件的内容</title> </head> <body> <form id="MengXianhui" runat="server"> <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="btnUpload" runat="server" Text="上传" OnClick="btnUpload_Click"></asp:Button> <p> <asp:Label ID="Msg" runat="server" ForeColor="Red"></asp:Label></p> </form> </body> </html>
文章来源:http://dotnet.aspx.cc/article/78280914-a75c-40dc-9dac-322b3d81be35/read.aspx
