string转DateTime

/// <summary>
/// 字符串转时间
/// </summary>
/// <param name="dateString">时间字符串</param>
/// <param name="format">时间格式（美国佬时间时可不设置）</param>
/// <param name="isUsType">是否是美国佬时间</param>
/// <returns></returns>
public static DateTime ConvertDateTime(string dateString, string format, bool isUsType)
{
    DateTime result;
    if (isUsType)
    {
        DateTimeFormatInfo dtfi = new CultureInfo("en-US", false).DateTimeFormat;
        dtfi.ShortTimePattern = "t";
        result = DateTime.Parse(dateString, dtfi);
    }
    else
    {
        CultureInfo provider = new CultureInfo("fr-FR");
        result = DateTime.ParseExact(dateString, format, provider);
    }
    return result;
}

需要引入命名空间 using System.Globalization;

发现用Convert.ToDateTime(xxxx)报错，就百度了，发现这样就不报错了。