default2.aspx.cs

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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 Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Boolean fileOK = false;
        String path = Server.MapPath("~/UploadedImages/");//保存上传文件的地方
        if (FileUpload1.HasFile)//判断是否选择文件
        {
            //取文件的扩展名
            String fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            String[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg" };//设置上传文件的类型
            for (int i = 0; i < allowedExtensions.Length; i++)//判断上文件是否符合要求
            {
                if (fileExtension == allowedExtensions[i])
                {
                    fileOK = true;
                }
            }
        }
        if (fileOK)//文件符合要求上传
        {
            try
            {
                FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                Response.Write("<script>alert('文件上传成功！');</script>");
                Image1.ImageUrl = "~/UploadedImages/" + FileUpload1.FileName;//相对服器路径
            }
            catch (Exception ex)
            {
                Response.Write("<script>alert('" + ex.Message + "');</script>");
            }
        }
        else
        {
            Response.Write("<script>alert('上传文件不符合要求！');</script>");
        }

    }
}