20181121.三目运算符使用.md

public NodeOSDownloadData GetCurrentOSDownloadData()
{
	return RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? Windows :
	RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ? Linux :
	RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? Mac :
	throw new NotSupportedException();
}