C#中获取文件夹地址、获取文件地址、获取文件夹中的某种类型文件集合、获取某文件中某种类型文件数量操作方法！

//获取文件夹地址
FolderBrowserDialog fbd = new FolderBrowserDialog();
fbd.Description = "The Description Of The Dialog";
if (fbd.ShowDialog() == DialogResult.OK)
{
string path = fbd.SelectedPath;
*******
*******
}

//获取某个文件地址
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "(FileTypeName)|(*.YourFileType)";
ofd.Title = "Your File Dialog Title";
if (ofd.ShowDialog() == DialogResult.OK)
{
string path = ofd.FileName;
*******
*******
}

//获取文件夹中某类文件集合
DirectoryInfo directoryInfo = new DirectoryInfo(PicturePosTextBox.Text);
FileInfo[] fileInfo = directoryInfo.GetFiles("*.jpg");
foreach (FileInfo info in fileInfo)
string fullName = info.FullName;
*******
*******

//获取某文件中某种类型文件数量
string fileType = "*.YourFileType";
string directoryPath = "********";
int fileNum = Directory.GetFiles(directoryPath, fileType).Length;

string fileFullName = @"C:\Program Files\Microsoft Visual Studio 14.0\test.jpg";
string filename = Path.GetFileName(fileFullName ); //文件名"test.jpg"
string extension = Path.GetExtension(fileFullName );//扩展名 ".aspxjpg"
string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileFullName );// 没有扩展名 "test"