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string dtStr = "20161012";
DateTime dt = DateTime.ParseExact(dtStr, @"yyyyMMdd", CultureInfo.InvariantCulture);
Console.WriteLine(dt);
dt = DateTime.Parse(Regex.Replace(dtStr, @"(\d{4})(\d{2})(\d{2})", "$1-$2-$3"));
Console.WriteLine(dt);
string a = "20161012";
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime b = DateTime.ParseExact(a, "yyyyMMdd", provider);