C#查询指定目录下的文件夹以及文件数量，现在只能查询得到当前目录的数量，关于子目录下的数量无法得出

Question

C#查询指定目录下的文件夹以及文件数量，现在只能查询得到当前目录的数量，关于子目录下的数量无法得出。
望高手指点一下问题出在哪？ 
具体代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;namespace WindowsFormsApplication12
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                FolderBrowserDialog folder = new FolderBrowserDialog();
                if (folder.ShowDialog() == DialogResult.OK)
                {
                    textBox1.Text = folder.SelectedPath;
                    label2.Text = "";
                }
            }
            else
            {
                if (label2.Text == "")
                {
                    SearchFile(textBox1.Text /*,0,0*/);
                }
                else
                {
                    textBox1.Text = "";
                }
            }
        }        private void SearchFile(string directory /*,countdir,countfile*/)
        {
            ////DirectoryInfo dir = new DirectoryInfo(directory);
            ////FileInfo[] fi = dir.GetFiles();
            ////countfile += fi.Length;
            ////DirectoryInfo[] di = dir.GetDirectories();
            ////countdir+=di.Length;
            ////foreach (DirectoryInfo d in di)
            ////{
            ////    string str = dir.ToString() + "\\" + d.ToString();
            ////    SearchFile(str, countdir, countfile);
            ////}
            int countfile = 0;
            int countdir = 0;
            DirectoryInfo dir = new DirectoryInfo(directory);
            FileSystemInfo[] f = dir.GetFileSystemInfos();
            foreach (FileSystemInfo i in f)
            {
                if (i is DirectoryInfo)
                {
                    countdir++;
                    SearchFile(i.FullName);
                }
                else if (i is FileInfo)
                {
                    countfile++;
                }
            }
            label2.Text = string.Format("該目錄下共有 {0} 個文件夾,{1} 個文件", countdir, countfile);
        }        private void From_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)027)
            {
                this.Close();
            }
        }        private void Form1_Load(object sender, EventArgs e)
        {
            label2.Text = "";
        }
    }
}

Answer 1

label2.Text = string.Format放到foreach体内最后试试

Answer 2

FileSystemInfo[] f = dir.GetFileSystemInfos("*", SearchOption.AllDirectories);