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