如何上传图片和现实

 

学习 2009-12-31 19:23:37 阅读17 评论2   字号：大中小 订阅

  以下为操作代码：

using System.IO;
using System.Data.SqlClient;

 
#region 图片操作
    private void pic_upload(string id)//上传操作
    {
        bool fileOK = false;
        string path = Server.MapPath("~/upload/");//将文件存到服务器目录upload下
        if (FileUpload1.HasFile)
        {
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            //string[] allowedExtensions = { ".gif", ".png", ".bmp", ".jpg" };
            string[] allowedExtensions = {  ".jpg" };
            for (int i = 0; i < allowedExtensions.Length; i++)
            {
                if (fileExtension == allowedExtensions[i])
                {
                    fileOK = true;
                }
            }
            if (fileOK)
            {   
                    DBClient db = new DBClient();
                    SqlConnection con = db.createConnection();
                    try
                    {
                        if (int.Parse(this.FileUpload1.PostedFile.ContentLength.ToString()) / 1024 > 50)
                        {
                            Response.Write("<script defer>alert('图片太大，超过50K，不能上传！请用相应图片处理软件将图片保存为宽112，高116的JPG格式图片。');</script>");
                        }
                        else
                        {
                             //FileUpload1.SaveAs(path + id + ".jpg");//如果想保存图片，请不要注释这句
                             //this.Image1.ImageUrl = "~/upload/" + id + ".jpg";
                             //图片上传，转为字节流写到数据库中
                             Stream imgStream = FileUpload1.PostedFile.InputStream;
                             int imgLen = FileUpload1.PostedFile.ContentLength;
                             byte[] imgdata = new byte[imgLen];
                             int n = imgStream.Read(imgdata, 0, imgLen);
                             string sql = "UPDATE [gyl_huliny] SET  [zhaopian]=@zhaopian WHERE huliny_id='" + id + "'";
                             SqlCommand cmd = con.CreateCommand();
                             cmd.CommandText = sql;
                             cmd.Parameters.Add("@zhaopian", imgdata);
                             con.Open();
                             if (cmd.ExecuteNonQuery() > 0)
                             {
                                 this.pic_load(id);
                                 Response.Write("<script>window.location=window.location;</script>");
                             }
                        }
                 }
                 catch (Exception ex)
                 {
                     Response.Write("<script defer>alert('文件上传失败！" + ex.Message + "');</script>");
                 }
                 finally
                 {
                     con.Close();
                 }
         }
         else
         {
                Response.Write("<script defer>alert('只能上传.jpg格式图片');</script>");
         }
        }
    }
    private void pic_load(string id)//加载图片
    {
        this.Image1.ImageUrl = "org_cun_hly_edit_pic_read.aspx?hly_id="+id;
    }
    protected void btn_upload_Click(object sender, EventArgs e)//点了上传
    {            
         this.pic_upload(Request.Params["hly_id"].ToString().Trim());                  
    }
#endregion
   浪费一张页面来加载图片，设计里不要拖上任何控件，看代码：

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;
using System.Data.SqlClient;//额外加的引用
public partial class org_org_cun_hly_edit_pic_read : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            if (Request.Params["hly_id"] != null)
            {
                this.hly_edit_pic_read(Request.Params["hly_id"].ToString().Trim());
            }
        }
    }
    #region 从数据库中读取图片
    private void hly_edit_pic_read(string id)
    {
           DBClient db = new DBClient();
            string sql = " select [zhaopian] from gyl_huliny WHERE zhaopian is not null and huliny_id='" + id + "'";
            SqlConnection con = db.createConnection();
            con.Open();
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandText = sql;
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            if (dr != null)
            {
                while (dr.Read())
                {
                    Response.BinaryWrite((byte[])dr["zhaopian"]);//直接写二进制流到页面
                }
            }
        }
    }
    #endregion
}

本文来源于Woody的鸟窝(Woody's Blog) http://www.smartgz.com/, 原文地址：http://www.smartgz.com/blog/Article/837.asp