C# 打开文件对话框 OpenFileDialog

            OpenFileDialog filedialog = new OpenFileDialog();
            filedialog.InitialDirectory = "C:\\";
            filedialog.Filter = "all files|*.*";
            filedialog.RestoreDirectory = true; //指示对话框在关闭前是否还原当前目录
            filedialog.FilterIndex = 1;
            if (filedialog.ShowDialog() == DialogResult.OK)

            {

            }