个人学习代码保存:例5.利用标准FileUpload单文件上传

个人学习代码保存:例5.利用标准FileUpload单文件上传

前台代码：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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="Button1" runat="server" Text="上传" OnClick="Button1_Click" /></div>
    </form>
</body>
</html>

后台代码：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)
    {
        if (FileUpload1.HasFile)
        {
            string FileName = FileUpload1.FileName;
            //取得文件类型
            string strFileExtend = FileName.Substring(FileName.LastIndexOf(".")+1);
            string[] NoFileExtend ={ "exe","php","asp"};
            bool Flag = true;
            for (int i = 0; i < NoFileExtend.Length; i++)
            {
                if (strFileExtend.Equals(NoFileExtend[i]))
                {
                    Flag = false;
                }
            }
            if (Flag)
            {
                string strFilePath = string.Format("files/{0}.{1}", DateTime.Now.ToString("mmhhddss"), strFileExtend);
                string path = Server.MapPath(strFilePath);
                FileUpload1.SaveAs(path);
                Page.ClientScript.RegisterStartupScript(this.GetType(), "Startup", "<script>alert('文件上传成功');</script>");
                Response.Write("格式化后的地址为："+strFilePath+"文件类型为："+strFileExtend);
            }
            else
            {

                Page.ClientScript.RegisterStartupScript(this.GetType(), "Startup", "<script>alert('" + string.Format("不能上传{0}格式文件", strFileExtend) + "');</script>");
            }
        }
        else
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(),"Startup","<script>alert('文件不能为空');</script>");
        }
    }
}
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原文地址：https://www.cnblogs.com/wbcms/p/1036658.html