【C#】获取文件、目录下所有文件、子目录文件

//Click event of button bt_loadsub
private void bt_loadsub_Click(object sender, EventArgs e)
{
openFileDialog1.Title = "Chose folder";
if (openFileDialog1.ShowDialog() == DialogResult.OK || openFileDialog1.ShowDialog() == DialogResult.Yes)
{
path = System.IO.Path.GetDirectoryName(openFileDialog1.FileName);

//获取目录下文件名
DirectoryInfo folder = new DirectoryInfo(path);
foreach (FileInfo item in folder.GetFiles("*"+Path.GetExtension(openFileDialog1.FileName)))
{
//MessageBox.Show("dictory" + item.Directory + "\n" + item.Name );
//re
//string pattern = @"(?<=HB(\d+).jpg-)[A-J]";//http://www.cnblogs.com/stg609/archive/2009/06/03/1492709.html
//MatchCollection mc = Regex.Matches(item.Name, pattern);
//MessageBox.Show(mc[0].Value);
string[] arr = {
item.Directory.FullName,
item.Name,
item.FullName
};
listView1.Items.Add(new ListViewItem(arr));
}
}
}

//Click event of button bt_loadAll (sub folder
private void bt_loadsubFolder_Click(object sender, EventArgs e)
{

FolderBrowserDialog folderBrowserDialog1 = new FolderBrowserDialog();

if(folderBrowserDialog1.ShowDialog() == DialogResult.OK || folderBrowserDialog1.ShowDialog() == DialogResult.Yes)
{
path = folderBrowserDialog1.SelectedPath;

//获取所有的子目录
DirectoryInfo di = new DirectoryInfo(path);//https://msdn.microsoft.com/en-us/library/s7xk2b58(v=vs.110).aspx
DirectoryInfo[] diArr = di.GetDirectories("*.*", System.IO.SearchOption.AllDirectories);//https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/file-system/how-to-iterate-through-a-directory-tree

foreach (DirectoryInfo dir in diArr)
{
//MessageBox.Show("Test" + dir.Name + " "+ dir.Root + " " + dir.FullName);
//dir.FullName 就是目录树下的所有子目录的文件

foreach (FileInfo item in dir.GetFiles(this.tb_fileextension.Text) )
{
string[] arr = {
item.Directory.FullName,
item.Name,
item.FullName//mc[0].Value
};
listView1.Items.Add(new ListViewItem(arr));
}//foreach
}//foreach
}//fi
}//f

//Click event of button bt_loadOne
private void bt_loadOne_Click(object sender, EventArgs e)
{
openFileDialog1.Title = "Chose one";
if(openFileDialog1.ShowDialog() == DialogResult.OK)
{
FileInfo item = new FileInfo(openFileDialog1.FileName);

string[] arr = {
item.Directory.FullName,
item.Name,
item.FullName
};
listView1.Items.Add(new ListViewItem(arr));
}
}