user_upload_face.aspx.cs

本程序基于 asp.net 2.0 +sql server 2

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;
using System.IO;

public partial class user_upload_face : System.Web.UI.Page
{
    int userid;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["userid"] == null)
            Response.Redirect("~/user/userLogin.aspx?url=" + Server.HtmlEncode(Request.RawUrl));
        else
            this.userid = Convert.ToInt32(Session["userid"]);

        if (IsPostBack && FileUpload1.HasFile)   uploadimg();
    }

    private string  uploadimg()
    {
        Boolean fileOK = false;
        String path = Server.MapPath("~/user/face/");

        //检验是否指定后缀
        if (FileUpload1.HasFile)
        {
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            String[] allowedExtensions =  { ".gif", ".png", ".jpeg", ".jpg" };
            for (int i = 0; i < allowedExtensions.Length; i++)
            {
                if (fileExtension == allowedExtensions[i])
                    fileOK = true;
            }
        //利用postedFile.ContentLength来判断文件长度,检查是否符合文件大小,250000就是250k字节
            if (fileOK && FileUpload1.PostedFile.ContentLength < 1000000)
                fileOK = true;
            else
                fileOK = false;
        }

        if (fileOK)
        {
            try
            {
                int id =this.userid ;
                string filename = path +id+ ".jpg";
                if (File.Exists(filename))
                    File.Delete(filename);
                FileUpload1.PostedFile.SaveAs(filename );

                string str="../user/face/"+id+".jpg";
                Label1.Text = "<img src="+str+"  width=200/>";
            }
            catch (Exception ex)
            {
                Label1.Text = ex.Message ;
            }
        }
        else
        {
            Label1.Text = "无法上传的文件类型或文件大小超过250K";
        }
        return "";
    }


}