5 .NET框架类在ASP.NET中的使用(2)

来源:互联网 发布:乐高机器人 c编程 编辑:程序博客网 时间:2024/06/08 09:54

1.ASP.NET中实现邮件系统

2.ASP.NET中存取图片到数据库

(1)将图片以二进制存储到数据库

            string pictureUrl ="";
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.InitialDirectory = "d:";
            ofd.RestoreDirectory = true;
            ofd.Filter = "*.jpg|*.jpg|*.bmp|*.bmp";
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    pictureUrl = ofd.FileName;//取得图片路径
                    pictureBox1.Image = Image.FromFile(pictureUrl);//将图片显示在pictureBox1控件中
                    FileStream fs = new FileStream(pictureUrl, FileMode.Open, FileAccess.Read);//将图片以文件流的形式进行保存
                    BinaryReader br = new BinaryReader(fs);
                    imgBytesIn = br.ReadBytes((int)fs.Length);
                }
                catch
                {
                    MessageBox.Show("您选择的图片不能被读取或文件类型不对!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    imgBytesIn = null;
                }
            }

(2)将数据库中的以二进制形式保存的图片存入到字节数组中
                try
                {
                    pic=(byte[])(ds.Tables[0].Rows[0]["photo"]);
                    MemoryStream ms = new MemoryStream(pic);//将字节数组存入到二进制流中
                    pictureBox1.Image = Image.FromStream(ms);//二进制流Image控件中显示
                }
                catch
                {
                    pictureBox1.Image = null;
                }

3.用XML传送图片

4.ASP.NET中的图像质量

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