OpenFileDialog的用法

private void button1_Click(object sender, EventArgs e)

        {

           openFileDialog.Filter = "所有数据库文件(db)|*.db";//设置文件类型,只允许db文件

           openFileDialog.Title = "选择要打开的数据库";               //设置标题

           openFileDialog.AddExtension = true;               //是否自动增加所辍名

           openFileDialog.AutoUpgradeEnabled = true;         //是否随系统升级而升级外观

           openFileDialog.InitialDirectory = Application.StartupPath;//默认打开程序当前目录

            if (openFileDialog.ShowDialog()== DialogResult.OK)

           {

                //输入代码

           }

            else

           {

                return;

           }

        }