上传图片到目录

前台：

代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UploadFiles.aspx.cs" Inherits="UploadFiles" %>

<!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">
        <asp:Label ID="Label1" runat="server" Text="请选择上传图片："></asp:Label>
        <asp:FileUpload ID="FileUpload1" runat="server" /><br />
        <asp:Button ID="upload" runat="server" OnClick="upload_Click" Text="上传" />
        <asp:Label ID="Label2" runat="server" Text="Label" Width="101px"></asp:Label>
    </form>
</body>
</html>

后台：

代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 UploadFiles : System.Web.UI.Page
{
    
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void upload_Click(object sender, EventArgs e)
    {
        Boolean fileOK = false;//标记测试文件的类型是否符合
        string filepath;
        String path = Server.MapPath("~/image/");
        if (FileUpload1.HasFile)
        {
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            string[] allowedExtensions ={ ".jpg" };
            for (int i = 0; i < allowedExtensions.Length; i++)
            {
                if (fileExtension == allowedExtensions[i])
                {
                    fileOK = true;
                }
            }
        }
        if (FileUpload1.PostedFile.ContentLength > 10240000)
        {
            fileOK = false;
        }
        if (fileOK)
        {
            try
            {
                FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                filepath = "~/image/" + FileUpload1.FileName;
                Label2.Text = "文件上传成功！"+filepath;
                
            }
            catch (Exception ex)
            {
                Label2.Text = "上传失败！";
            }
        }
        else
        {
            Label2.Text = "无法实现上传，请检测上传文件大小和格式是否符合要求！";
        }
    }
}