asp.net图片上传及删除

方法一：

UploadImage cetFU = new UploadImage();

            if (cetFU.UpFile(FileUpload1, "teacher_picture"))//如果上传成功 第一个参数表示fileupload插件名称，第二表示文件夹的名称

            {

                ImageName = cetFU.FileName;

                ImageType = ImageName.Substring(ImageName.IndexOf("."), ImageName.Length - ImageName.IndexOf("."));

            }

            else//如果上传失败

            {

                Response.Write(bc.MessageBox(cetFU.ErrMsg));     //弹出错误提示

            }

能简单的就进行上传图片。

 方法二：

protected void btnupload_Click(object sender, System.EventArgs e)

        {

          

            string fullFileName = this.File1.PostedFile.FileName;

            string fileName = fullFileName.Substring(fullFileName.LastIndexOf("\\") + 1);获取文件名

            string type = fullFileName.Substring(fullFileName.LastIndexOf(".") + 1);获取文件类型



            string time = this.dropyear.Text + this.droplist.Text;



            if (fileName.Length > 20)

            {

                Response.Write("<script language='javascript'>alert('您上传的文件名必须在15个字符之内！');</script>");

            }

            else

            {



                if (type == "jpg" || type == "bmp" || type == "gif")

                {

                    conn.Open();

                    string sql = "select * from kb where filepath='" + fileName + "'";

                    if (DB.ExecuteSqlEx(sql) == 1)//自己编写的类的方法，执行SQL语句

                    {

                        this.File1.PostedFile.SaveAs(Server.MapPath("upload") + "\\" + fileName);

                        sql = "insert into kb(filepath,kbtime) values('" + fileName + "','"+time+"')";

                        DB.ExecuteSql(sql);

                        this.Image1.ImageUrl = "upload/" + fileName;

                        this.Image1.Visible = true;



                        sql = "select count(*) from kb";

                        SqlCommand cmd = new SqlCommand(sql, conn);

                        this.lblNum.Text = cmd.ExecuteScalar().ToString();



                        Response.Write("<script language='javascript'>alert('上传成功，您可以继续上传其它图片！');</script>");

                    }

                    else

                    {

                        Response.Write("<script language='javascript'>alert('图片名已存在，请重命名后再上传！');</script>");

                    }



                }

                else

                {

                    Response.Write("<script language='javascript'>alert('你选择的图片格式错误！');</script>");

                }

            }

        }

相对比较清晰的说明了上传的过程。

 

删除文件  

File.Delete(Server.MapPath("teacher_picture\\" + ImageName));//删除某个文件