c# winform窗體之開啟檔案對話方塊openfiledialog

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //初始顯示的目錄
            openFileDialog1.InitialDirectory = @"D:\tcbs_net";
            //操作完後恢復為原有的目錄
           openFileDialog1.RestoreDirectory = true;
            //filter是設定開啟檔案對話方塊　檔案型別的下拉選單子項為 txt files(*.txt)和all files(*.*)共2個子項
            //filter的值全是一對對的，比如 bat files(*.bat)|*.bat，以|分隔的2部分
            openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*|bat files(.bat)|*.bat";
            //filterindex與上個屬性filter關聯對應；它是顯示開啟檔案對話方塊時預設顯示的檔案型別下拉選單的子項內容
            openFileDialog1.FilterIndex = 2;//預設是1
            if (openFileDialog1.ShowDialog()==DialogResult.OK)
            ;//執行開啟檔案對話方塊 openfiledialog
        }
    }