static void Main(string[] args)
{
Console.WriteLine("请选择要打开的文件的路径");
string path = Console.ReadLine();
Console.WriteLine("请选择要打开的文件");
string fileName = Console.ReadLine();
string fullPath = path + fileName;
//调试时，便于观察，而做的输出 Console.WriteLine(fullPath);
FileFather ff = GetFile(fullPath);
ff.OpenFile();
Console.ReadKey();
}
public static FileFather GetFile(string fullPath)
{
string extension = Path.GetExtension(fullPath);
//调试时，便于观察，而做的输出 Console.WriteLine(extension);
FileFather ff = null;
switch (extension)
{
//切记Path.GetExtension(fullPath);返回的的文件后缀是带有一个点的
case ".txt": ff = new TxtFile(fullPath);
break;
case ".jpg": ff = new jpgFile(fullPath);
break;
case ".wav": ff = new wavFile(fullPath);
break;
}
return(ff);
}